scholarly journals Electrochemically Driven Phase Transition in LiCoO2 Cathode

Materials ◽  
2021 ◽  
Vol 14 (2) ◽  
pp. 242
Author(s):  
Jinhui Tan ◽  
Zhongzui Wang ◽  
Guangzhao Li ◽  
Huicong Hu ◽  
Jie Li ◽  
...  
Keyword(s):  
Phase Transition ◽  
Specific Capacity ◽  
Lithium Ion ◽  
Portable Devices ◽  
Lithium Cobalt Oxide ◽  
Transition Path ◽  
Capacity Fading ◽  
Theoretical Specific Capacity ◽  
Conventional Cell ◽  
Licoo2 Cathode

Lithium cobalt oxide (LiCoO2), which has been successfully applied in commercial lithium-ion batteries for portable devices, possesses a theoretical specific capacity of 274 mAh g−1. However, its actual capacity is only half of the theoretical specific capacity, because the charging voltage is restricted below 4.2 V. If a higher charging voltage is applied, an irreversible phase transition of LiCoO2 during delithiation would occur, resulting in severe capacity fading. Therefore, it is essential to investigate the electrochemically driven phase transition of LiCoO2 cathode material to approach its theoretical capacity. In this work, it was observed that LiCoO2 partially degraded to Co3O4 after 150 charging-discharging cycles. From the perspective of crystallography, the conventional cell of LiCoO2 was rebuilt to an orthonormal coordinate, and the transition path from layered LiCoO2 to cubic Co3O4 proposed. The theoretical analysis indicated that the electrochemically driven phase transition from LiCoO2 to Co3O4 underwent several stages. Based on this, an experimental verification was made by doping LiCoO2 with Al, In, Mg, and Zr, respectively. The doped samples theoretically predicted behavior. The findings in this study provide insights into the electrochemically driven phase transition in LiCoO2, and the phase transition can be eliminated to improve the capacity of LiCoO2 to its theoretical value.

Enhanced electrochemical performance of lithium ion batteries using Sb2S3 nanorods wrapped in graphene nanosheets as anode materials

Nanoscale ◽  
2018 ◽  
Vol 10 (7) ◽  
pp. 3159-3165 ◽  
Author(s):  
Yucheng Dong ◽  
Shiliu Yang ◽  
Zhenyu Zhang ◽  
Jong-Min Lee ◽  
Juan Antonio Zapien
Keyword(s):  
Electrochemical Performance ◽  
Lithium Ion Batteries ◽  
Anode Materials ◽  
Graphene Nanosheets ◽  
Specific Capacity ◽  
Lithium Ion ◽  
Lithium Insertion ◽  
Insertion Reactions ◽  
Theoretical Specific Capacity ◽  
Enhanced Electrochemical Performance

Antimony sulfide can be used as a promising anode material for lithium ion batteries due to its high theoretical specific capacity derived from sequential conversion and alloying lithium insertion reactions.

scholarly journals The Use of Succinonitrile as an Electrolyte Additive for Composite-Fiber Membranes in Lithium-Ion Batteries

Membranes ◽  
2020 ◽  
Vol 10 (3) ◽  
pp. 45 ◽  
Author(s):  
Jahaziel Villarreal ◽  
Roberto Orrostieta Chavez ◽  
Sujay A. Chopade ◽  
Timothy P. Lodge ◽  
Mataz Alcoutlabi
Keyword(s):  
Ionic Liquid ◽  
Ionic Conductivity ◽  
Lithium Ion Batteries ◽  
Specific Capacity ◽  
Lithium Ion ◽  
Composite Fiber ◽  
Galvanostatic Charge ◽  
Lithium Anode ◽  
Charge Discharge ◽  
Licoo2 Cathode

In the present work, the effect of temperature and additives on the ionic conductivity of mixed organic/ionic liquid electrolytes (MOILEs) was investigated by conducting galvanostatic charge/discharge and ionic conductivity experiments. The mixed electrolyte is based on the ionic liquid (IL) (EMI/TFSI/LiTFSI) and organic solvents EC/DMC (1:1 v/v). The effect of electrolyte type on the electrochemical performance of a LiCoO2 cathode and a SnO2/C composite anode in lithium anode (or cathode) half-cells was also investigated. The results demonstrated that the addition of 5 wt.% succinonitrile (SN) resulted in enhanced ionic conductivity of a 60% EMI-TFSI 40% EC/DMC MOILE from ~14 mS·cm−1 to ~26 mS·cm−1 at room temperature. Additionally, at a temperature of 100 °C, an increase in ionic conductivity from ~38 to ~69 mS·cm−1 was observed for the MOILE with 5 wt% SN. The improvement in the ionic conductivity is attributed to the high polarity of SN and its ability to dissolve various types of salts such as LiTFSI. The galvanostatic charge/discharge results showed that the LiCoO2 cathode with the MOILE (without SN) exhibited a 39% specific capacity loss at the 50th cycle while the LiCoO2 cathode in the MOILE with 5 wt.% SN showed a decrease in specific capacity of only 14%. The addition of 5 wt.% SN to the MOILE with a SnO2/C composite-fiber anode resulted in improved cycling performance and rate capability of the SnO2/C composite-membrane anode in lithium anode half-cells. Based on the results reported in this work, a new avenue and promising outcome for the future use of MOILEs with SN in lithium-ion batteries (LIBs) can be opened.

Self-assembly encapsulation of Si in N-doped reduced graphene oxide for use as a lithium ion battery anode with significantly enhanced electrochemical performance

2019 ◽  
Vol 3 (6) ◽  
pp. 1427-1438 ◽  
Author(s):  
Xing Li ◽  
Yongshun Bai ◽  
Mingshan Wang ◽  
Guoliang Wang ◽  
Yan Ma ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Electrochemical Performance ◽  
Self Assembly ◽  
Specific Capacity ◽  
Lithium Ion ◽  
Reduced Graphene ◽  
Theoretical Specific Capacity ◽  
Discharge Potential ◽  
Enhanced Electrochemical Performance ◽  
Battery Anode

Silicon is considered as an anode for next generation lithium ion batteries owing to its low discharge potential (∼0.4 V vs. Li/Li+) and high theoretical specific capacity (3500 mA h g−1).

Excess lithium storage in LiFePO4-Carbon interface by ball-milling

2016 ◽  
Vol 09 (05) ◽  
pp. 1650053 ◽  
Author(s):  
Hua Guo ◽  
Xiaohe Song ◽  
Jiaxin Zheng ◽  
Feng Pan
Keyword(s):  
Ball Milling ◽  
Lithium Iron Phosphate ◽  
Specific Capacity ◽  
Lithium Ion ◽  
Iron Phosphate ◽  
Effective Capacity ◽  
Lithium Storage ◽  
Electrical Vehicle ◽  
Milling Method ◽  
Theoretical Specific Capacity

As one of the most popular cathode materials for high power lithium ion batteries (LIBs) of the electrical-vehicle (EV), lithium iron phosphate (LiFePO4 (LFP)) is limited to its relatively lower theoretical specific capacity of 170[Formula: see text]mAh g[Formula: see text]. To break the limits and further improve the capacity of LFP is promising but challenging. In this study, the ball-milling method is applied to the mixture of LFP and carbon, and the effective capacity larger than the theoretical one by 30[Formula: see text]mAh g[Formula: see text] is achieved. It is demonstrated that ball-milling leads to the LFP-Carbon interface to store the excess Li-ions.

Controlling the Voltage Window for Improved Cycling Performance of SnO2 as Anode Material for Lithium-Ion Batteries

2020 ◽  
Vol 20 (11) ◽  
pp. 7051-7056
Author(s):  
Jungwon Heo ◽  
Anupriya K. Haridas ◽  
Xueying Li ◽  
Rakesh Saroha ◽  
Younki Lee ◽  
...  
Keyword(s):  
Lithium Ion Batteries ◽  
Anode Material ◽  
Specific Capacity ◽  
Lithium Ion ◽  
Cycling Performance ◽  
Oxide Materials ◽  
Capacity Fading ◽  
Lithium Ions ◽  
Volume Variation ◽  
Capacity Decay

Transition metal oxide materials with high theoretical capacities have been studied as substitutes for commercial graphite in lithiumion batteries. Among these, SnO2 is a promising alloying reaction-based anode material. However, the problem of rapid capacity fading in SnO2 due to volume variation during the alloying/dealloying processes must be solved. The lithiation of SnO2 results in the formation of a Li2O matrix. Herein, the volume variation of SnO2 was suppressed by controlling the voltage window to 1 V to prevent the delithiation reaction between Li2O and Sn. Using this strategy the unreacted Li2O matrix was enriched with metallic Sn particles, thereby providing a pathway for lithium ions. The specific capacity decay in the voltage window of 0.05–3 V was 1.8% per cycle. However, the specific capacity decay was improved to 0.04% per cycle after the voltage window was restricted (in the range of 0.05–1 V). This strategy resulted in a specific capacity of 374.7 mAh g−1 at 0.1 C after 40 cycles for the SnO2 anode.

Facile synthesis of vanadyl acetate one-dimensional nanobelts toward a novel anode for lithium storage

2021 ◽  
Author(s):  
Ni Wen ◽  
Siyuan Chen ◽  
xiaolong Li ◽  
Ke Zhang ◽  
Jingjie Feng ◽  
...  
Keyword(s):  
Metal Oxides ◽  
Lithium Ion Batteries ◽  
Transition Metal Oxides ◽  
Anode Materials ◽  
Specific Capacity ◽  
Lithium Ion ◽  
Facile Synthesis ◽  
Lithium Storage ◽  
One Dimensional ◽  
Theoretical Specific Capacity

Transition metal oxides (TMOs) are prospective anode materials for lithium-ion batteries (LIBs) owing to their high theoretical specific capacity. Whereas, the inherent low conductivity of TMOs restricts its application. Given...

Hierarchical self-assembled Bi2S3 hollow nanotubes coated with sulfur-doped amorphous carbon as advanced anode materials for lithium ion batteries

Nanoscale ◽  
2018 ◽  
Vol 10 (28) ◽  
pp. 13343-13350 ◽  
Author(s):  
Yucheng Dong ◽  
Mingjun Hu ◽  
Zhenyu Zhang ◽  
Juan Antonio Zapien ◽  
Xin Wang ◽  
...  
Keyword(s):  
Reaction Mechanism ◽  
Lithium Ion Batteries ◽  
Anode Material ◽  
Amorphous Carbon ◽  
Anode Materials ◽  
Specific Capacity ◽  
Lithium Ion ◽  
Bismuth Sulfide ◽  
Theoretical Specific Capacity ◽  
Self Assembled

Bismuth sulfide (Bi2S3) is considered as a promising anode material for lithium ion batteries (LIBs) owing to its high theoretical specific capacity and intriguing reaction mechanism.

In situ grown Nb4N5 nanocrystal on nitrogen-doped graphene as a novel anode for lithium ion battery

RSC Advances ◽  
2016 ◽  
Vol 6 (84) ◽  
pp. 81290-81295 ◽  
Author(s):  
Chenlong Dong ◽  
Xin Wang ◽  
Xiangye Liu ◽  
Xiaotao Yuan ◽  
Wujie Dong ◽  
...  
Keyword(s):  
Lithium Ion Battery ◽  
Specific Capacity ◽  
Lithium Ion ◽  
Niobium Nitride ◽  
Nitrogen Doped ◽  
Nitrogen Doped Graphene ◽  
Doped Graphene ◽  
Theoretical Specific Capacity

The metal-rich niobium nitride of Nb4N5 has higher conductivity than Nb3N5 and a higher theoretical specific capacity than NbN.

Enabling high electrochemical activity of a hollow SiO2 anode by decorating it with ultrafine cobalt nanoparticles and a carbon matrix for long-lifespan lithium ion batteries

Nanoscale ◽  
2020 ◽  
Vol 12 (25) ◽  
pp. 13442-13449 ◽  
Author(s):  
Mengyao Zhu ◽  
Yabin Shen ◽  
Limin Chang ◽  
Dongming Yin ◽  
Yong Cheng ◽  
...  
Keyword(s):  
Lithium Ion Batteries ◽  
Anode Material ◽  
Specific Capacity ◽  
Lithium Ion ◽  
Carbon Matrix ◽  
Cobalt Nanoparticles ◽  
Electrochemical Activity ◽  
Theoretical Specific Capacity

Silica is a very promising anode material for lithium-ion batteries, due to its advantages of being resource-rich and having high theoretical specific capacity.

scholarly journals Effect of Ni Doping Content on Phase Transition and Electrochemical Performance of TiO2 Nanofibers Prepared by Electrospinning Applied for Lithium-Ion Battery Anodes

Materials ◽  
2020 ◽  
Vol 13 (6) ◽  
pp. 1302
Author(s):  
Danning Kang ◽  
Jun Li ◽  
Yuyao Zhang
Keyword(s):  
Electrochemical Performance ◽  
Current Density ◽  
Specific Capacity ◽  
Lithium Ion ◽  
Doping Content ◽  
Ni Doping ◽  
Tio2 Nanofibers ◽  
Initial Discharge ◽  
Theoretical Specific Capacity ◽  
A Current

Titanium dioxide (TiO2), as a potential anode material applied for lithium-ion batteries (LIBs), is constrained due to its poor theoretical specific capacity (335 mAh·g−1) and low conductivity (10−7-10−9 S·cm−1). When compared to TiO2, NiO with a higher theoretical specific capacity (718 mAh·g−1) is regarded as an alternative dopant for improving the specific capacity of TiO2. The present investigations usually assemble TiO2 and NiO with a simple bilayer structure and without NiO that is immersed into the inner of TiO2, which cannot fully take advantage of NiO. Therefore, a new strategy was put forward to utilize the synergistic effect of TiO2 and NiO, namely doping NiO into the inner of TiO2. NiO-TiO2 was fabricated into the nanofibers with a higher specific surface area to further improve their electrochemical performance due to the transportation path being greatly shortened. NiO-TiO2 nanofibers are expected to replace of the commercialized anode material (graphite). In this work, a facile one-step electrospinning method, followed by annealing, was applied to synthesize the Ni-doped TiO2 nanofibers. The Ni doping content was proven to be a crucial factor affecting phase constituents, which further determined the electrochemical performance. When the Ni doping content was less than 3 wt.%, the contents of anatase and NiO were both increased, while the rutile content was decreased in the nanofibers. When the Ni doping content exceeded 3 wt.%, the opposite changes were observed. Hence, the optimum Ni doping content was determined as 3 wt.%, at which the highest weight fractions of anatase and NiO were obtained. Correspondingly, the obtained electronic conductivity of 4.92 × 10−5 S⋅cm−1 was also the highest, which was approximately 1.7 times that of pristine TiO2. The optimal electrochemical performance was also obtained. The initial discharge and charge specific capacity was 576 and 264 mAh·g−1 at a current density of 100 mA·g−1. The capacity retention reached 48% after 100 cycles, and the coulombic efficiency was about 100%. The average discharge specific capacity was 48 mAh·g−1 at a current density of 1000 mA·g−1. Approximately 65.8% of the initial discharge specific capacity was retained when the current density was recovered to 40 mA·g−1. These excellent electrochemical results revealed that Ni-doped TiO2 nanofibers could be considered to be promising anode materials for LIBs.

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