scholarly journals Excellent Temperature Performance of Spherical LiFePO4/C Composites Modified with Composite Carbon and Metal Oxides

2014 ◽  
Vol 2014 ◽  
pp. 1-6
Author(s):  
Bao Zhang ◽  
Tao Zeng ◽  
Jiafeng Zhang ◽  
Chunli Peng ◽  
Junchao Zheng ◽  
...  
Keyword(s):  
Low Temperature ◽  
Room Temperature ◽  
Electrochemical Performances ◽  
Initial Discharge Capacity ◽  
Sintering Process ◽  
Capacity Retention ◽  
Voltage Range ◽  
Temperature Performance ◽  
Initial Discharge ◽  
Composite Carbon

Nanosized spherical LiFePO4/C composite was synthesized from nanosized spherical FePO4·2H2O, Li2C2O4, aluminum oxide, titanium oxide, oxalic acid, and sucrose by binary sintering process. The phases and morphologies of LiFePO4/C were characterized using SEM, TEM, CV, EIS, EDS, and EDX as well as charging and discharging measurements. The results showed that the as-prepared LiFePO4/C composite with good conductive webs from nanosized spherical FePO4·2H2O exhibits excellent electrochemical performances, delivering an initial discharge capacity of 161.7 mAh·g−1at a 0.1 C rate, 152.4 mAh·g−1at a 1 C rate and 131.7 mAh·g−1at a 5 C rate, and the capacity retention of 99.1%, 98.7%, and 95.8%, respectively, after 50 cycles. Meanwhile, the high and low temperature performance is excellent for 18650 battery, maintaining capacity retention of 101.7%, 95.0%, 88.3%, and 79.3% at 55°C, 0°C, −10°C, and −20°C by comparison withthat of room temperature (25°C) at the 0.5 C rate over a voltage range of 2.2 V to 3.6 V, respectively.

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.

Effects of K in Mn2O3 on the Electrochemical Performances of Spinel Li1.06Mn2O4

2013 ◽  
Vol 773 ◽  
pp. 611-616
Author(s):  
Xing Zou ◽  
Chun Lin Peng
Keyword(s):  
Discharge Capacity ◽  
Retention Rate ◽  
Lithium Ion ◽  
Cycle Performance ◽  
Manganese Carbonate ◽  
Electrochemical Performances ◽  
Initial Discharge Capacity ◽  
Doping Amount ◽  
Capacity Retention ◽  
Initial Discharge

Spinel LiMn2O4 material is one of the lithium-ion battery cathodes. It is cheap, nontoxic, and safe in use. This cathode material, Li1.06Mn2O4 was synthesized by using solid state reaction and two different starting materials. One was the Mn2O3 made from the industrial manganese carbonate with different contents of potassium, and the other was the high-purity Mn2O3 into which the same amount of potassium in the form of K2CO3 was added to form the K-doped spinel Li1.06Mn2O4. These two kinds of LiMn2O4 materials were characterized by XRD, SEM and electrochemical performance analysis. The results showed that the initial discharge capacity of the former cathode materials decreased gradually and the cycle performance was improved with the amount of potassium increasing. The Li1.06Mn2O4 with a content of 192.2 μg.g-1 of potassium presented the optimized electrochemical performances, with an initial discharge capacity of 128.974mAh.g-1, and a capacity retention rate of 89.90% after 50 cycles. The initial discharge capacity of doped Li1.06Mn2O4 dropped rapidly with the doping amount increasing and the capacity retention rate was not as good as that of the Mn2O3 made from the industrial manganese carbonate with different contents of potassium.

Synthesis and Electrochemical Performance of Li3V2(PO4)3 Cathode Material by Microwave Method

2012 ◽  
Vol 490-495 ◽  
pp. 3624-3627
Author(s):  
Sheng Kui Zhong ◽  
Hui Ping Hu ◽  
Jie Qun Liu
Keyword(s):  
Perfect Crystal ◽  
Microwave Method ◽  
Initial Discharge Capacity ◽  
X Ray Diffraction ◽  
Capacity Retention ◽  
Voltage Range ◽  
X Ray ◽  
Initial Discharge ◽  
Charge Discharge ◽  
Discharge Test

Monoclinic Li3V2(PO4)3 was synthesized by a microwave method. The influence of sintering temperatures and time on the synthesis of Li3V2(PO4)3 was investigated by X-ray diffraction (XRD), scanning electron microscope (SEM) and charge-discharge test. The results of these tests shows that the Li3V2(PO4)3 sample synthesized at 850 °C for 15 min has pure and perfect crystal. The charge-discharge test shows the Li3V2(PO4)3 sample with optimal synthesis condition has the best initial discharge capacity of 120 mAh/g, with capacity retention of 101 mAh/g after 50 cycles, in the voltage range of 3.0 V–4.2 V.

An inorganic–organic nanocomposite calix[4]quinone (C4Q)/CMK-3 as a cathode material for high-capacity sodium batteries

2017 ◽  
Vol 4 (11) ◽  
pp. 1806-1812 ◽  
Author(s):  
Shibing Zheng ◽  
Jinyan Hu ◽  
Weiwei Huang
Keyword(s):  
Cathode Material ◽  
Discharge Capacity ◽  
High Capacity ◽  
Initial Discharge Capacity ◽  
Capacity Retention ◽  
Initial Discharge ◽  
Sodium Batteries

A novel high-capacity cathode material C4Q/CMK-3 for SIBs shows an initial discharge capacity of 438 mA h g−1 and a capacity retention of 219.2 mA h g−1 after 50 cycles.

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.

scholarly journals The Use of Cryogenic Techniques to Achieve High Sensitivity in Gravitational Wave Detectors

1974 ◽  
Vol 64 ◽  
pp. 40-51 ◽  
Author(s):  
S. P. Boughn ◽  
W. M. Fairbank ◽  
M. S. McASHAN ◽  
H. J. Paik ◽  
R. C. Taber ◽  
...  
Keyword(s):  
Low Temperature ◽  
Gravitational Wave ◽  
Room Temperature ◽  
High Sensitivity ◽  
Cryogenic Detectors ◽  
Temperature Performance ◽  
Gravitational Wave Detectors ◽  
Low Temperature Performance ◽  
Under Construction

Cryogenic detectors for gravitational wave astronomy promise greatly improved sensitivity over room temperature detectors. The 3 mK detector which we have under construction should give an improvement of 106 over existing detectors. The cryogenic antennae are described and the calculated low temperature performance is detailed. New superconducting instrumentation is described.

The Preparation and Characterization of LiFe0.98Ni0.01Nb0.01PO4/C by Carbon Reduction Route

2012 ◽  
Vol 581-582 ◽  
pp. 570-573
Author(s):  
Jia Feng Zhang ◽  
Bao Zhang ◽  
Xue Yi Guo ◽  
Jian Long Wang ◽  
He Zhang Chen ◽  
...  
Keyword(s):  
Carbon Coating ◽  
Xrd Analysis ◽  
Initial Discharge Capacity ◽  
X Ray Diffraction ◽  
Capacity Retention ◽  
X Ray ◽  
Carbon Reduction ◽  
Initial Discharge ◽  
Structure Morphology

The LiFe0.98Ni0.01Nb0.01PO4/C was synthesized by carbon reduction route using FePO4•2H2O as precursor. The LiFe0.98Ni0.01Nb0.01PO4/C sample was characterized by X-ray diffraction (XRD), scanning electron microscope (SEM) and electrochemical measurements. The XRD analysis, SEM and TEM images show that sample has the good crystal structure, morphology and carbon coating. The charge-discharge tests demonstrate that the powder has the better electrochemical properties, with an initial discharge capacity of 164.6 mAh•g−1 at current density of 0.1 C. The capacity retention reaches 99.8% after 100 cycles at 0.1C.

High energy density hybrid Mg2+/Li+ battery with superior ultra-low temperature performance

2016 ◽  
Vol 4 (6) ◽  
pp. 2277-2285 ◽  
Author(s):  
Zhonghua Zhang ◽  
Huimin Xu ◽  
Zili Cui ◽  
Pu Hu ◽  
Jingchao Chai ◽  
...  
Keyword(s):  
Energy Density ◽  
Low Temperature ◽  
High Energy ◽  
High Potential ◽  
High Energy Density ◽  
Polar Regions ◽  
Capacity Retention ◽  
Temperature Performance ◽  
Li Battery ◽  
Low Temperature Performance

A hybrid Mg2+/Li+ battery operates at a high potential of 2.45 V and delivers superior properties, especially at ultra-low temperature (77% capacity retention at −40 °C), which is preferable for many peculiar fields and places, such as polar regions, aerospace, and deep offshore waters.

Fabrication of layered Ti3C2 with an accordion-like structure as a potential cathode material for high performance lithium–sulfur batteries

2015 ◽  
Vol 3 (15) ◽  
pp. 7870-7876 ◽  
Author(s):  
Xiaoqin Zhao ◽  
Min Liu ◽  
Yong Chen ◽  
Bo Hou ◽  
Na Zhang ◽  
...  
Keyword(s):  
Cathode Material ◽  
Discharge Capacity ◽  
High Performance ◽  
Coulombic Efficiency ◽  
Initial Discharge Capacity ◽  
Capacity Retention ◽  
Initial Discharge ◽  
Lithium Sulfur Batteries ◽  
Lithium Sulfur

L-Ti3C2 was prepared by exfoliating Ti3AlC2 in 40% HF. With sulfur-loaded L-Ti3C2 as cathodes, Li–S batteries deliver a high initial discharge capacity of 1291 mA h g−1, an excellent capacity retention of 970 mA h g−1 and coulombic efficiency of 99% after 100 cycles.

The Effect of PEG on Performance of Li0.96Na0.04Ni1/3Co1/3Mn1/3O2 as Cathode Material

2013 ◽  
Vol 575-576 ◽  
pp. 7-10
Author(s):  
Chun Xia Gong ◽  
Oluwatosin Emmanued Bankole ◽  
Li Xu Lei
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Cathode Material ◽  
Cycle Performance ◽  
Initial Discharge Capacity ◽  
Capacity Retention ◽  
Peg 400 ◽  
Initial Discharge ◽  
Pure Phase ◽  
Scanning Electron

Li0.96Na0.04Ni1/3Co1/3Mn1/3O2with PEG400 or PEG2000 as additive was synthesized by coprecipitation method. Xray diffraction pattern reveals that both the products with PEG400 and PEG2000 are pure phase. Scanning Electron Microscopy shows that the average sizes of the powders are 100 nm and 80 nm, respectively. The sample with PEG 2000 has initial discharge capacity (205.8 Mah×g1) and the sample with PEG 400 exhibits good cycle performance with the capacity retention of 86.34 % after 90 cycles compared to that has no additive (167.6 mAh.g-1and 71.18 %) in the cut-off voltage of 2.0-4.5 V at 0.1 C rate. Therefore, PEG400 or PEG2000 as additive should improve the performance of Li0.96Na0.04Ni1/3Co1/3Mn1/3O2cathode material.

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