【作者】 李青海； 蒲薇华； 任建国； 何向明； 万春荣； 姜长印；

【Author】 LI Qing-hai, PU Wei-hua, REN Jian-guo, HE Xiang-ming, WAN Chun-rong, JIANG Chang-yin (Hanata Battery Joint-Stock Co. Ltd. , Changjiang 572700, China; Materials Chemistry Laboratory, Institute of Nuclear and New Energy Technology, Tsinghua University, Beijing 102201, China)

【机构】 海南海能达电池股份有限公司； 清华大学核能与新能源技术研究院材料化学实验室；

【摘要】 采用一种低温电解液体系和优化设计的混合碳负极材料组装了手机用363450方形锂离子电池,测试了该电池在不同低温下及不同放电倍率时的电化学性能。测试结果表明:-20℃及-30℃下,该电池0.2C倍率的放电容量保持率在98.1%以上;-40℃时,0.2C放电效率也达到40%,表现出良好的低温放电性能。随着温度的降低和放电倍率的提高,相对于常温电池,其放电容量保持率逐渐减小,-20℃下,1C放电容量保持率降低为69.3%,-30℃和-40℃下,分别降低为33.5%和12.6%;而且随着温度的降低,电压平台也随之降低。说明通过负极材料和电解液的优化,能显著改善电池的低温放电性能。但该电池在1C倍率以上、一30℃以下的低温放电性能还不能完全满足特殊应用要求,还有待进一步研究解决。更多还原

【Abstract】 A low temperature electrolyte system and anode materials of optimized carbon mixtures were applied to assemble the prismatic lithium-ion battery of type 363450, which was used for mobile telephone. The electrochemical performances of the battery were tested at different low temperatures and different discharging rates. The results show that the discharge capacity retentions of 0. 2C is above 98. 1 % at - 20℃ and- 30 ℃ The initial discharge efficiency of the battery reaches 40% at 0. 2C rate and -40℃. It illuminates that the battery has a good discharge performance. According to the batteries at room temperature, the discharge capacity retention declines along with the decrease of temperature and the increase of discharging rates. They gradually decline to 69.3%, 33.5%, 12. 6% at - 20 ℃ , -30℃ , and - 40 ℃ , respectively. The voltage plateaus of discharge also decrease with the decrease of temperature. It indicates that the low temperature discharging performance of the battery can be improved greatly through the optimization of anode materials and electrolyte solution. But the discharge performance under - 30℃ and above 1C rate is not fully satisfied yet. So it needs to be investigated further.更多还原