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Effects of charging rates on liNi_(0.6)Mn_(0.2)Co_(0.2)O_(2)(NMC622)/graphite li-ion cells

Journal of Energy Chemistry 2021年第5期30卷 121-126页

作者： Xianyang Wu Yaocai Bai Zhenglong li Jue liu Kejie Zhao Zhijia Du Energy and Transportation Science Division Oak Ridge National LaboratoryOak RidgeTN 37830USA School of Mechanical Engineering Purdue UniversityWest LafayetteIN 47907USA Neutron Scattering Division Oak Ridge National LaboratoryOak RidgeTN 37830USA

Enabling fast charging capability of lithium-ion battery is of great importance to widespread adoption of electric *** the charging rates from state-of-the-art 2 C(30 min)to 6 C(10 min)requires deep understanding on the cell aging *** this study,400 mAh pouch cells are cycled at 1 C,4 C and 6 C charging rates with 1 C discharging *** fading,cathode structural changes,li inventory loss,electrolyte composition changes and li plating on graphite electrodes are thoroughly studied by various characterization *** rapid capacity fading in cells at 6 C charging rate is mainly due to li inventory loss from cathode structure and metallic li plating on graphite electrode at higher charging ***-mortem analysis also revealed changes in electrolyte such as increased salt molarity and transesterification during fast charging.

关键词： li-ion cells Fast charging Post-test analysis Neutron powder diffraction

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Preparation of liNi_xCo_(l-x)O_2 Cathode Material for li-ion cells

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Journal of Wuhan University of Technology(Materials Science) 2001年第4期16卷 6-9页

作者：邹正光 Department of Material Engineering Guilin Institute of Technology Guilin 541004 China

The cathode materials liNixCo1-xO2 (0≤x≤1) for lithium ion battery were prepared in solid phase . The effects of synthesis temperature , the time of heat treatment and also the ratio of raw materials on products were discussed . The residts showed that the products preheated under 600℃ and then sintered under constant, temperature 75017 were better than those sintered under constant temperature 650℃ or 850℃ , and their layer structures were more obvious and their initial capacity was higher . The longer the heat-treating time is , the stronger the products ’ XRD peaks intensity and the better their structures and electrochemical performance are. The samples liN-ix Co 1-xO2(0≤x≤1) with a perfect structure and electrochemical performance were synthesized. And the products initial capacity was perfect when n(li) : n( Ni) : n( Co) ℃ 1.15:0.3:0.7,viz. 156.l46mAh/g.

关键词： li-ion cells cathode materials synthesis liNixCo1-xO2

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Effect of linear carboxylic ester on low temperature performance of liMn_2O_4-graphite cells

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Transactions of Nonferrous Metals Society of China 2015年第1期25卷 206-210页

作者：洪树李劼王冠超张治安赖延清中南大学冶金与环境学院长沙410083

To improve the low-temperature performances of li-ion cells, three types of linear carboxylic ester-based electrolyte, such as EC/EMC/EA（1：1：2, mass ratio）, EC/EMC/EP（1：1：2, mass ratio） and EC/EMC/EB（1：1：2, mass ratio）, were prepared to substitute for industrial electrolyte（EC/EMC/DMC）. Then, 18650-type li Mn2O4-graphite cells（nominal capacity of 1150 mA ·h） were assembled and studied. Results show that the cells containing three types of electrolyte are able to undertake 5C discharging current with above 93% capacity retention at-20 °C. Electrochemical impedance spectra show that the discharge capacity fading of li-ion cells at low temperature is mainly ascribed to the charge transfer resistance increasing with temperature decreasing. In comparison, the cells containing electrolyte of 1.0 mol/L liPF6 in EC/EMC/EA（1：1：2, mass ratio） have the highest capacity retention of 90% at-40 °C and 44.41% at-60 °C, due to its lowest charge-transfer resistance.

关键词： li-ion cells low temperature performance electrolyte linear carboxylic ester ionic conductivity charge-transfer resistance

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