scholarly journals Serial Disulfide Polymers as Cathode Materials in Lithium-Sulfur Battery: Materials Optimization and Electrochemical Characterization

2020 ◽  
Vol 10 (7) ◽  
pp. 2538
Author(s):  
Jing Wang ◽  
Shichao Zhang
Keyword(s):  
Carbon Black ◽  
Cathode Materials ◽  
Retention Rate ◽  
Specific Capacity ◽  
Peanut Oil ◽  
Electrochemical Performances ◽  
Capacity Retention ◽  
Tung Oil ◽  
Conductive Carbon Black ◽  
Copolymer Poly

Herein, a series of novel disulfide polymers were synthesized by using the raw materials of diallyl-o-phthalate, tung oil, peanut oil, and styrene. Four kinds of products: Poly (sulfur-diallyl-o-phthalate) copolymer, poly (sulfur-tung oil) copolymer, poly (sulfur-peanut oil) copolymer, and poly (sulfur-styrene-peanut oil) terpolymer were characterized, and their solubility was studied and compared. Among the four kinds of disulfide polymers, poly (sulfur-styrene-peanut oil) terpolymer had the best solubility in an organic solvent, and it was chosen to be the active cathode material in Li-S battery. Subsequently, two different conductive additives—conductive carbon black and graphene were separately blended with this terpolymer to prepare two battery systems. The electrochemical performances of the two batteries were compared and analyzed. The result showed that the initial specific capacity of poly (sulfur-styrene-peanut oil) terpolymer (blended with conductive carbon black) battery was 935.88 mAh/g, with the capacity retention rate about 43.5%. Comparingly, the initial specific capacity of poly (sulfur-styrene-peanut oil) terpolymer (blended with graphene) battery was 1008.35 mAh/g, with the capacity retention rate around 60.59%. Therefore, the battery system of poly (sulfur-styrene-peanut oil) terpolymer with graphene showed a more stable cycle performance and better rate performance. This optimized system had a simple and environmental-friendly synthesis procedure, which showed a great application value in constructing cathode materials for the Li-S battery.

A Novel Synthesis of Nanometer Spherical β-Ni(OH)2 Cathode Materials with High Electrochemical Performances

2014 ◽  
Vol 936 ◽  
pp. 491-495
Author(s):  
Li Chen ◽  
Yan Ming Wang ◽  
Juan Liu ◽  
Xing Yao Wang
Keyword(s):  
Particle Size ◽  
Cathode Materials ◽  
Specific Capacity ◽  
Naphthenic Acid ◽  
Electrochemical Performances ◽  
Small Particle Size ◽  
Capacity Retention ◽  
Novel Synthesis ◽  
Loaded Organic Phase ◽  
Xrd And Tem

A novel hydrothermal stripping technique synthesis route, in which the nickel-loaded organic phase of naphthenic acid was directly stripped by water at 140-240 °C for 2.0 h to recover nickel as hydroxide precipitates, has been firstly developed. The nickel hydroxide powders synthesized by this route was the spherical β-Ni(OH)2 and had a small particle size in the range of 20-100 nm shown by XRD and TEM test. The results of electrochemical performances show that the nanometer β-Ni(OH)2 cathode materials have much higher discharge specific capacity, excellent capacity retention and cycle performances.

Influences of Precursor’s Processing Method on the Electrochemical Properties of Synthesized Lithium Vanadium Phosphate

2013 ◽  
Vol 724-725 ◽  
pp. 1071-1074
Author(s):  
Dao Wu Shuang Shi ◽  
Zheng Zhang ◽  
Hong Yuan Zhao ◽  
Xin Quan Liu
Keyword(s):  
Particle Size ◽  
Electrochemical Properties ◽  
Retention Rate ◽  
Hydrothermal Process ◽  
Specific Capacity ◽  
Lithium Vanadium Phosphate ◽  
Electrochemical Performances ◽  
Capacity Retention ◽  
Discharge Specific Capacity ◽  
Initial Discharge

Li3V2(PO4)3/C composite cathode material was synthesized by solid state method using LiOH•H2O, NH4H2PO4, NH4VO3 as raw materials, sucrose as carbon source, and two kinds of precursor’s treatment such as pre-sintering and hydrothermal methods. The effect of different precursor’s treatment methods on the electrochemical properties of the material was investigated. The results showed that the samples treated with hydrothermal process has smaller particle size and the initial discharge specific capacity of 119mAh/g, the capacity retention rate is 85% after 20 cycles. But the samples treated with pre-sintering (without hydrothermal process) has larger particle size and the initial discharge specific capacity 103.2mAh/g, the capacity retention rate is only 72% after 20 cycles. These results can be attributed to that the hydrothermally treated sample has smaller particle sizes, higher conductivity and shorter distances of lithium ion diffusion and electron mobility, thus the electrochemical performances are improved.

scholarly journals Effects of pre-charge temperatures on gas production and electrochemical performances of lithium-ion batteries

2021 ◽  
Vol 248 ◽  
pp. 01040
Author(s):  
Shi Xiaoyan ◽  
Ma Leilei ◽  
Wang Jiantao
Keyword(s):  
Room Temperature ◽  
Influence Factor ◽  
Retention Rate ◽  
Lithium Ion ◽  
Gas Production ◽  
Electrochemical Performances ◽  
Capacity Retention ◽  
Film Forming ◽  
Charge Temperature

Pre-charge as a key step in the battery manufacture processes, which has a great impact on the film-forming properties and electrochemical performances, especially the Li-rich system batteries. As a key influence factor, it is necessary to clarify the effect of pre-charge temperature on battery performance. In this paper, we mainly studied the influence of different pre-charge temperatures (25°C, 40°C, 60°C) on the gas production and electrochemical performance of the batteries. The results show that the increase of the pre-charge temperature will result in the increase of gas production, and the gas components are mainly CO2, H2. After the long-term cycle, the sample under 40°C maintains the highest capacity retention rate, and as the pre-charge temperature increases, the median voltage of the battery can be effectively increased. In addition, compared with room temperature pre-charge, high pre-charge temperature samples have more excellent rate performance.

Tris(trimethylsilyl) phosphite (TMSPi) as an electrolyte additive for LiNi0.5Co0.2Mn0.3O2 cathode materials at elevated voltage and temperature

2021 ◽  
Author(s):  
Xiao Yu ◽  
Zhiyong Yu ◽  
Jishen Hao ◽  
Hanxing Liu
Keyword(s):  
Discharge Capacity ◽  
Cathode Materials ◽  
Solid Electrolyte Interphase ◽  
Rate Capability ◽  
Electrochemical Performances ◽  
Initial Discharge Capacity ◽  
Capacity Retention ◽  
Electrolyte Additive ◽  
Interface Impedance ◽  
Initial Discharge

Electrolyte additive tris(trimethylsilyl) phosphite (TMSPi) was used to promote the electrochemical performances of LiNi[Formula: see text]Co[Formula: see text]Mn[Formula: see text]O2 (NCM523) at elevated voltage (4.5 V) and temperature (55[Formula: see text]C). The NCM523 in 2.0 wt.% TMSPi-added electrolyte exhibited a much higher capacity (166.8 mAh/g) than that in the baseline electrolyte (118.3 mAh/g) after 100 cycles under 4.5 V at 30[Formula: see text]C. Simultaneously, the NCM523 with 2.0 wt.% TMSPi showed superior rate capability compared to that without TMSPi. Besides, after 100 cycles at 55[Formula: see text]C under 4.5 V, the discharge capacity retention reached 87.4% for the cell with 2.0 wt.% TMSPi, however, only 24.4% of initial discharge capacity was left for the cell with the baseline electrolyte. A series of analyses (TEM, XPS and EIS) confirmed that TMSPi-derived solid electrolyte interphase (SEI) stabilized the electrode/electrolyte interface and hindered the increase of interface impedance, resulting in obviously enhanced electrochemical performances of NCM523 cathode materials under elevated voltage and/or temperature.

Flower-like C@V2O5 microspheres as highly electrochemically active cathode in aqueous zinc-ion batteries

2020 ◽  
Vol 10 (10) ◽  
pp. 1697-1703
Author(s):  
Zebin Wu ◽  
Wei Zhou ◽  
Zhen Liu ◽  
Yijie Zhou ◽  
Guilin Zeng ◽  
...  
Keyword(s):  
Electrochemical Properties ◽  
Retention Rate ◽  
Specific Capacity ◽  
Cycling Performance ◽  
Zinc Ion ◽  
Rate Performance ◽  
Capacity Retention ◽  
Facile Hydrothermal Method ◽  
High Specific Capacity ◽  
Electrochemically Active

Flower-like C@V2O5 microspheres with high specific capacity were synthesized by a facile hydrothermal method. The microstructure, specific capacity and electrochemical properties of C@V2O5 microspheres were studied. Results showed that the C@V2O5 microspheres with a diameter of ∼3 m are covered over by V2O5 nanosheets, and therefore have a large surface area which is almost 5 times higher than that of pure V2O5 powders. Moreover, the initial specific capacity of C@V2O5 microsphere is as high as 247.42 mAh · g–1, and after 100 cycles, the capacity retention rate is still 99.4%. Compared with pure V2O5, flower-like C@V2O5 microspheres show higher discharge specific capacity, better rate performance and more stable cycling performance.

FACILE SOL–GEL SYNTHESIS OF Li[Li0.2Mn0.56Ni0.16Co0.08]O2 AS IMPROVED CATHODE MATERIAL FOR LITHIUM-ION BATTERIES

2013 ◽  
Vol 01 (04) ◽  
pp. 1340015
Author(s):  
WENJUAN HAO ◽  
HAN CHEN ◽  
YANHONG WANG ◽  
HANHUI ZHAN ◽  
QIANGQIANG TAN ◽  
...  
Keyword(s):  
Cathode Materials ◽  
Sol Gel ◽  
Specific Capacity ◽  
Lithium Ion ◽  
Electrochemical Performances ◽  
Acetate Tetrahydrate ◽  
Li Ion Batteries ◽  
Gel Method ◽  
Sol Gel Method ◽  
Li Ion

Li [ Li 0.2 Mn 0.56 Ni 0.16 Co 0.08] O 2 cathode materials for Li -ion batteries were synthesized by a facile sol–gel method followed by calcination at various temperatures (700°C, 800°C and 900°C). Lithium acetate dihydrate, manganese (II) acetate tetrahydrate, nickel (II) acetate tetrahydrate and cobalt (II) acetate tetrahydrate are employed as the metal precursors, and citric acid monohydrate as the chelating agent. For the obtained Li [ Li 0.2 Mn 0.56 Ni 0.16 Co 0.08] O 2 materials, the metal components existed in the form of Mn 4+, Ni 2+ and Co 3+, and their molar ratio was in good agreement with 0.56 : 0.16 : 0.08. The calcination temperature played an important role in the particle size, crystallinity and further electrochemical properties of the cathode materials. The Li [ Li 0.2 Mn 0.56 Ni 0.16 Co 0.08] O 2 material calcined at 800°C for 6 h showed the best electrochemical performances. Its discharge specific capacities cycled at 0.1 C, 0.5 C, 1 C and 2 C rates were 266.0 mAh g−1, 243.1 mAh g−1, 218.2 mAh g−1 and 192.9 mAh g−1, respectively. When recovered to 0.1 C rate, the discharge specific capacity was 260.2 mAh g−1 and the capacity loss is only 2.2%. This work demonstrates that the sol–gel method is a facile route to prepare high performance Li [ Li 0.2 Mn 0.56 Ni 0.16 Co 0.08] O 2 cathode materials for Li -ion batteries.

Synthesis and Electrochemical Performances of Nanoparticle FePO4 and Ce-Doped FePO4 Cathode Materials for Lithium Ion Batteries by Microemulsion Method

2013 ◽  
Vol 743-744 ◽  
pp. 35-43
Author(s):  
Shi Ming Zhang ◽  
Jun Xi Zhang ◽  
Bo Cheng He ◽  
Suo Jiong Xu ◽  
Xu Ji Yuan
Keyword(s):  
Electrochemical Properties ◽  
Lithium Ion Batteries ◽  
Cathode Materials ◽  
Specific Capacity ◽  
Great Influence ◽  
Lithium Ion ◽  
Synthesis Temperature ◽  
Microemulsion System ◽  
Electrochemical Performances ◽  
Microemulsion Method

nanosized FePO4 and Fe1-xCexPO4 (x=0.02, 0.04, 0.08) cathode materials were synthesized by microemulsion method. The samples were prepared via a microemulsion system in a H2O/cyclohexane/Triton x-100/n-butyl alcohol at different temperatures (30 , 45 , 50 , 60 ) and then sintered at 380 and 460 for 3 h. The thermal stability, structure and morphology were investigated by means of TG/DCS, X-ray diffraction (XRD), field emission-scanning electron microscopy (FE-SEM), and the electrochemical properties were characterized by cyclic voltammetry (CV) and galvanostatic charge and discharge tests. Results show that synthesis temperature has a great influence on the performances of FePO4, and the sample synthesized at 45 shows the best performances with a diameter of about 20 nm and a high discharge initial specific capacity of 142mAh/g and retaining 123mAh/g after 20 cycles at 0.1 C. The Ce-doped FePO4, Fe1-xCexPO4 (x=0.02, 0.04, 0.08), can effectively improve the electrochemical properties of FePO4 cathode materials. The Fe0.96Ce0.04PO4 exhibits an initial discharge capacity of 158.2mAh/g and retains 152mAh/g after 20 cycles at 0.1 C. Hence, Fe0.96Ce0.04PO4 is a promising candidate for cathode materials of lithium ion batteries.

Influence of the Preparation Process on the Electrochemical Properties of xLiFePO4·yLi3V2(PO4)3/C Nano-Sized Composite Cathode Materials

2016 ◽  
Vol 680 ◽  
pp. 238-243 ◽  
Author(s):  
Bing Yan ◽  
Peng Zhao Gao ◽  
Dong Yun Li ◽  
Guang Lei Tian
Keyword(s):  
Citric Acid ◽  
Electrochemical Properties ◽  
Cathode Materials ◽  
Retention Rate ◽  
Specific Capacity ◽  
Composite Cathode ◽  
Discharge Process ◽  
Discharge Specific Capacity ◽  
Calcination Temperatures ◽  
Charge Discharge

In this paper, a series of xLiFePO4·yLi3V2(PO4)3/C (x/y = 1:0, 7:1, 5:1, 3:1, 1:1, 1:3 and 0:1, ratio in mol) nano-sized composite cathode materials were successfully prepared via the solid reaction method. Influence of x/y ratio, calcination temperatures and the content of citric acid on the composition, microstructure and electrochemical properties of the materials were characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM) and electrochemical measurements, et al. results showed that the xLFP·yLVP/C (x and y ≠ 0) composites were composed of olivine LiFePO4 and monoclinic Li3V2(PO4)3, both of which featured slight structural distortions as the formation of V-doped LFP/C and Fe-doped LVP/C, respectively; With the increase of calcination temperatures, the crystallinity and particles size of the 7LFP·LVP/C composites increased, when calcined at 700°C, the initial charge/discharge specific capacity of the composites reached a maximum value of 145.6 mAh/g, and the voltage drop values between charge/discharge platform possessed the minimum value(0.04 V), suggesting the minimum polarization of the composites in charge/discharge process. Content of citric acid did not affect the compositions of the composites, with the increase of the molar ratio of citric acid to V3+, the discharge specific capacities of 7LFP·LVP/C increased first and then decreased, when it equaled to 1.0:1.0, the discharge specific capacity of the relative composites was 119.18 mAh/g, with a capacity retention rate of 93.9 % after 50 cycles, owning the excellent electrochemical stability.

scholarly journals Application of PVDF Organic Particles Coating on Polyethylene Separator for Lithium Ion Batteries

Materials ◽  
2019 ◽  
Vol 12 (19) ◽  
pp. 3125 ◽  
Author(s):  
Yuan Wang ◽  
Chuanqiang Yin ◽  
Zhenglin Song ◽  
Qiulin Wang ◽  
Yu Lan ◽  
...  
Keyword(s):  
Lithium Ion Batteries ◽  
Polyvinylidene Fluoride ◽  
Retention Rate ◽  
Rate Capability ◽  
Lithium Ion ◽  
Organic Polymer ◽  
Electrochemical Performances ◽  
Capacity Retention ◽  
Organic Particles ◽  
Surface Modified

Surface coating modification on a polyethylene separator serves as a promising way to meet the high requirements of thermal dimensional stability and excellent electrolyte wettability for lithium ion batteries (LIBs). In this paper, we report a new type of surface modified separator by coating polyvinylidene fluoride (PVDF) organic particles on traditional microporous polyethylene (PE) separators. The PE separator coated by PVDF particles (PE-PVDF separator) has higher porosity (61.4%), better electrolyte wettability (the contact angle to water was 3.28° ± 0.21°) and superior ionic conductivity (1.53 mS/cm) compared with the bare PE separator (51.2%, 111.3° ± 0.12°, 0.55 mS/cm). On one hand, the PVDF organic polymer has excellent organic electrolyte compatibility. On the other hand, the PVDF particles contain sub-micro spheres, of which the separator can possess a large specific surface area to absorb additional electrolyte. As a result, LIBs assembled using the PE-PVDF separator showed better electrochemical performances. For example, the button cell using a PE-PVDF as the separator had a higher capacity retention rate (70.01% capacity retention after 200 cycles at 0.5 C) than the bare PE separator (62.5% capacity retention after 200 cycles at 0.5 C). Moreover, the rate capability of LIBs was greatly improved as well—especially at larger current densities such as 2 C and 5 C.

Preparation of LiCoO2 from Cathode Materials of Spent Lithium Ion Batteries

2011 ◽  
Vol 183-185 ◽  
pp. 1553-1557 ◽  
Author(s):  
Fang Gu ◽  
Qian Nie
Keyword(s):  
Lithium Ion Batteries ◽  
Discharge Capacity ◽  
Cathode Materials ◽  
Retention Rate ◽  
Ammonium Oxalate ◽  
Lithium Ion ◽  
X Ray Diffraction ◽  
Capacity Retention ◽  
Excellent Electrochemical Performance ◽  
Pure Phase

Preparation of LiCoO2 cathode materials from spent lithium ion batteries are presented. The processes contain reduction, separation, precipitation, regeneration. The optimum conditions of recovery are: the calcination temperature is 500°C, the volume rate of sulfuric acid and the water reaches 0.375, the hightest leach-ing rate of cobalt is 43.53%. According to the solubility of oxalate, ammonium oxalate is choiced as precipitation agent. The investigation of X-ray diffraction (XRD), scanning electron microscopy (SEM), charge-discharge testes at voltage ranges rate from 2.8V to 4.2V versus Li , 0.2 C rate are performed. The results reveal that the regenerative LiCoO2 is pure phase, initial discharge capacity is 128.63 mAh•g-1, after 50 cycles the discharge capacity is 118.61 mAh•g-1, capacity retention rate is 92.21%. The regenerative LiCoO2 exhibits excellent electrochemical performance and stability. The materials may find promising applications in lithium ion batteries.

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