Electrochemical Studies on Al2O3-Coated Spinel LiMn2O4 for Lithium Ion Batteries

2011 ◽  
Vol 675-677 ◽  
pp. 37-40
Author(s):  
Ying Bai ◽  
Chuan Wu ◽  
Feng Wu ◽  
Bo Rong Wu ◽  
Shi Chen
Keyword(s):  
Discharge Capacity ◽  
Chemical Deposition ◽  
Lithium Ion ◽  
Heat Treating ◽  
Thin Layers ◽  
Electrochemical Performances ◽  
Capacity Loss ◽  
Heat Treated ◽  
Chemical Deposition Method

Spinel LiMn2O4 was synthesized via a solid state reaction, and modified with Al2O3 thin layers by a chemical deposition method. The electrochemical performances of the as-prepared samples were investigated with cyclic voltammetry (CV) and charge-discharge test. It is found that the Al2O3-coated LiMn2O4 help dramatically retaining the discharge capacity upon long-term cycling. The influences of the heat-treating temperature and the coating amount are discussed and compared. The optimized sample is 1% Al2O3/ LiMn2O4 heat-treated at 500oC, which has an initial discharge capacity of 116mAh/g, and a very slight capacity loss of 1.7% at the 50th cycle.

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.

Effect of heat treatment time on cycle performance of LiMn2O4 with “Nano Inclusion” for lithium ion batteries

RSC Advances ◽  
2015 ◽  
Vol 5 (53) ◽  
pp. 42455-42460 ◽  
Author(s):  
Shogo Esaki ◽  
Motoaki Nishijima ◽  
Shigeomi Takai ◽  
Takeshi Yao
Keyword(s):  
Heat Treatment ◽  
Lithium Ion Batteries ◽  
Discharge Capacity ◽  
Treatment Time ◽  
Lithium Ion ◽  
Heat Treatment Time ◽  
Cycle Performance ◽  
Heat Treated

The cycle performance of LiMn2O4 with “Nano Inclusions” is higher than that of LiMn2O4 without “Nano Inclusions” and the discharge capacity of LiMn2O4 with “Nano Inclusions” heat-treated for 4 h surpassed that of LiMn2O4 without it at over 31 cycles.

Synthesis and Characterization of LiNi0.4Co0.2Mn0.4O2 Cathode Material via Urea Co-Precipitation Method

2011 ◽  
Vol 295-297 ◽  
pp. 700-703
Author(s):  
Sheng Kui Zhong ◽  
Yue Bin Xu ◽  
Yan Wei Li ◽  
Chang Jiu Liu ◽  
Yan Hong Li
Keyword(s):  
Discharge Capacity ◽  
Sintering Temperature ◽  
Lithium Ion ◽  
Precipitation Method ◽  
Electrochemical Performances ◽  
Electrochemical Characteristics ◽  
Sintering Time ◽  
Structure Morphology ◽  
Co Precipitation

LiNi0.4Co0.2Mn0.4O2 sampleswas synthesized via urea co-precipitation method. The XRD, SEM and electrochemical measurements were used to examine the structure,morphology and electrochemical characteristics, respectively. LiNi0.4Co0.2Mn0.4O2 powders show excellent electrochemical performances. The optimum sintering temperature and sintering time are 800°C and 20 h, respectively. The LiNi0.4Co0.2Mn0.4O2 powders shows the discharge capacity of 145.1 mAh·g-1in the range of 3.0-4.5 V at the first cycle, and the discharge capacity remains 132.3 mAh·g-1after 30 cycles. The urea co-precipitation method is suitable for the preparation of LiNi0.4Co0.2Mn0.4O2 cathode materials with good electrochemical performances for lithium ion batteries.

scholarly journals A comparative investigation of different chemical treatments on SiO anode materials for lithium-ion batteries: towards long-term stability

RSC Advances ◽  
2017 ◽  
Vol 7 (8) ◽  
pp. 4501-4509 ◽  
Author(s):  
Jihoon Woo ◽  
Seong-Ho Baek
Keyword(s):  
Anode Materials ◽  
Effective Means ◽  
Lithium Ion ◽  
Comparative Investigation ◽  
Electrochemical Performances ◽  
Long Term Stability ◽  
Chemical Treatments ◽  
Boron Doped ◽  
Carbon Coated

In this work, we conduct a comparative study of boron-doped SiO (HB-SiO) and carbon-coated SiO (HC-SiO) to find an effective means of improving the electrochemical performances of SiO anode materials during long-cycle tests.

Synthesis and Electrochemical Properties of Cathode Material LiNi0.8Co0.1Mn0.1O2 via Li, Mg, Al Dopping

2014 ◽  
Vol 1058 ◽  
pp. 302-306 ◽  
Author(s):  
Sha Yuan ◽  
Liang Bin Liu ◽  
Yan Ping Tang ◽  
Jian Hua Wang ◽  
Yu Zhong Guo
Keyword(s):  
Cathode Material ◽  
Electrochemical Properties ◽  
Discharge Capacity ◽  
High Efficiency ◽  
Lithium Ion ◽  
Initial Discharge Capacity ◽  
Capacity Loss ◽  
Initial Discharge ◽  
Result Show ◽  
Properties Of Materials

Coprecipitation method is adopted to prepare LiNi0.8Co0.1Mn0.1O2, to discuss the factors of affecting electrochemical properties and structure at lithium ion battery cathode material LiNi0.8Co0.1Mn0.1O2. In order to improve the electrochemical properties of materials, LiNi0.8Co0.1Mn0.1O2 materials were modified by doping the cation of Li or Mg or Al. Through the charge-discharge tests in the range of 2.5~4.3V, the result show that doped Mg samples with a discharge capacity and high efficiency as well as the lowest capacity loss, the initial discharge capacity is 205.9mA.h/g, after 20 cycles the discharge capacity reached 142.4mA.h/g.

Influence of Carbon Inclusion on the Electrochemical Performances for Si Using as the Lithium-Ion Battery Anode

2016 ◽  
Vol 852 ◽  
pp. 811-815
Author(s):  
Yue Qin Ban ◽  
Wei Quan Shao ◽  
Sha Ou Chen ◽  
Li Zhu He ◽  
Hai Ling Zhu ◽  
...  
Keyword(s):  
Discharge Capacity ◽  
Lithium Ion ◽  
Charge Transfer Resistance ◽  
Electrochemical Performances ◽  
Capacity Retention ◽  
Transfer Resistance ◽  
Conductive Pathway ◽  
Initial Discharge ◽  
Lower Charge ◽  
Carbon Inclusion

Si/C composite was prepared using different procedures and different C sources in this work. According to the electrochemical performances, it was found that the discharge capacity for Si/C composite (SC1) by the electrostatic spinning procedure using polyvinylpyrrolidone as the C source was 2200mAh/g. In contrast, the cell with the pure Si particle exhibited an initial discharge capacity of only 13mAh/g. Moreover, after 30 cycles, SC1 sample had the higher capacities and the better capacity retention performances than other samples because of its lower charge transfer resistance. The inclusion of carbon not only worked as a stable electric conductive pathway but also buffer the volume expansion of the silicon during the process of charging and discharging.

scholarly journals A Comparison of Lithium-Ion Cell Performance across Three Different Cell Formats

Batteries ◽  
2021 ◽  
Vol 7 (2) ◽  
pp. 38
Author(s):  
Grace Bridgewater ◽  
Matthew J. Capener ◽  
James Brandon ◽  
Michael J. Lain ◽  
Mark Copley ◽  
...  
Keyword(s):  
Degradation Mechanism ◽  
Single Layer ◽  
Lithium Ion ◽  
Capacity Loss ◽  
Lithium Ion Cells ◽  
Lithium Ion Cell ◽  
A Cell ◽  
The Difference ◽  
Discharge Capacities

To investigate the influence of cell formats during a cell development programme, lithium-ion cells have been prepared in three different formats. Coin cells, single layer pouch cells, and stacked pouch cells gave a range of scales of almost three orders of magnitude. The cells used the same electrode coatings, electrolyte and separator. The performance of the different formats was compared in long term cycling tests and in measurements of resistance and discharge capacities at different rates. Some test results were common to all three formats. However, the stacked pouch cells had higher discharge capacities at higher rates. During cycling tests, there were indications of differences in the predominant degradation mechanism between the stacked cells and the other two cell formats. The stacked cells showed faster resistance increases, whereas the coin cells showed faster capacity loss. The difference in degradation mechanism can be linked to the different thermal and mechanical environments in the three cell formats. The correlation in the electrochemical performance between coin cells, single layer pouch cells, and stacked pouch cells shows that developments within a single cell format are likely to lead to improvements across all cell formats.

Layered Li(Ni, M)O2Systems as the Cathode Material in Lithium-Ion Batteries

MRS Bulletin ◽  
2002 ◽  
Vol 27 (8) ◽  
pp. 608-612 ◽  
Author(s):  
C. Delmas ◽  
L. Croguennec
Keyword(s):  
Cathode Material ◽  
Lithium Batteries ◽  
Lower Cost ◽  
Lithium Ion ◽  
Electrochemical Performances ◽  
Nickel Compound ◽  
Synthesis Conditions ◽  
Capacity Loss ◽  
Electrochemical Reversibility ◽  
Lithium Nickel Oxide

AbstractCompared with LiCoO2, the dominant cathode material in today's lithium batteries, lithium nickel oxide derivatives [Li(Ni, M)O2, where M – Co, Fe, Al, Mg] offer a higher specific energy at a lower cost. The synthesis and structure of these materials are described. The electrochemical performances of the pure nickel compound and a number of multicomponent systems are assessed. The goals of these fundamental studies are to optimize the synthesis conditions and material composition to achieve good electrochemical reversibility, decrease capacity loss upon cycling, and enhance thermal stability in the deintercalated state in order to improve cell safety.

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