Mechanisms for different cyclabilities of commercial LiCoO2/artificial graphite pouch cells at−10,0,and 25℃  

作　　者：Renbo Deng Shiran Li Qianqian Wang Jiaying Liang Xufeng Zang Huiling Xi 

机构地区：[1]Huzhou Key Laboratory of Materials for Energy Conversion and Storage,School of Science,Huzhou University,Zhejiang,Huzhou,313000,China [2]Laboratory Management Department,Huzhou University,Zhejiang,Huzhou,313000,China

出　　处：《Particuology》2024年第12期145-153,共9页颗粒学报（英文版）

基　　金：the Natural Science Foundation of Zhejiang Province,China (grant No.LQ21B030004);the Natural Science Foundation of Huzhou City,China (grant No.2022YZ38 and 2021YZ06);the Foundation for Science and Technology Commissioner,China (grant No.2023KT77)for their supports to this work.

摘　　要：Although a few studies reveal the reasons of poor charge-discharge abilities for lithium-ion batteries based on LiNi_(x)Mn_(y)Co_(1-x-y)O_(2) at low temperature,there are still some practical issues worthy of further investigation.For instance,how the side reactions affect the cyclabilities of commercial LiCoO_(2)/artificial graphite(LCO/AG)cells at different low temperatures,and are the synergistic effects between the side reactions similar to that at room temperature?To answer the issues,the performances of a-3 Ah LCO/AG pouch cell at different temperatures and C-rates are studied.Results illustrate that the obvious increase in charge transferring impedance especially in AG anode at low temperature causes large polarization,then reducing charge-discharge ability and even yielding lithium deposition at−10℃ and 0.5C under 3−4.45 V.Different from at room temperature,the side reactions such as electrolyte decomposition and electrode structural evolution reduce significantly at low temperature,which contribute to an excellent cyclability after 500 cycles at 0℃.Instead,a series of chain reactions cause a relative lower cyclability at 25℃.Lithium deposition is slight after 5 cycles at−10℃,but become considerably severe after 20 cycles and cause rollover failure of capacity.All these results deepen the understanding on mechanisms for different behaviors of LCO/AG cells at low temperature and provide optimization direction.

关 键 词：Lithium-ion batteries LiCoO_(2) Low temperature Cycle stability Failure mechanism 

分 类 号：TM912[电气工程—电力电子与电力传动]