倍率对钛酸锂负极锂离子电池热安全的影响  

Effect of rate on the thermal safety of lithium titanate anode Li-ion battery

作　　者：陶鑫 谢松 TAO Xin;XIE Song(College of Civil Aviation Safety Engineering,Civil Aviation Flight University of China,Deyang,Sichuan 618307,China)

机构地区：[1]中国民用航空飞行学院民航安全工程学院,四川德阳618307

出　　处：《电池》2024年第5期672-676,共5页Battery Bimonthly

基　　金：四川省重点研发计划(2022YFG0236);四川省重点实验室自主项目(MZ2022JB02)。

摘　　要：钛酸锂(Li_(4)Ti_(5)O_(12))负极锂离子电池具有倍率性能好、循环寿命长、安全性高等优势,但仍有相关热失控的事故发生。为探究倍率对电池热安全性的影响,以圆柱形LiNi_(0.5)Co_(0.2)Mn_(0.3) O_(2)/Li_(4)Ti_(5)O_(12)锂离子电池为对象,通过不同充放电倍率循环及热失控实验,分析电池的容量-电压、放电直流内阻和热失控温度变化等数据。高倍率循环会导致电池正极活性物质损失,引起循环性能和热安全性能衰减。电池热安全性与倍率呈负相关:当倍率由2.00 C升至8.00 C时,热失控触发温度由358.5℃降低至254.1℃,热失控时间由3608 s缩短到2980 s,热失控时的最大升温速率由34.2℃/s增加至59.7℃/s。Lithium titanate(Li_(4)Ti_(5)O_(12))anode Li-ion battery has good rate capability,long cycle life,and high safety,but incidents related to thermal runaway still occur.To investigate the impact of the rate on thermal safety performance of battery,cylindrical LiNi_(0.5)Co_(0.2)Mn_(0.3) O_(2)/Li_(4)Ti_(5)O_(12) Li-ion battery is selected as the subject.Different charge and discharge rates are employed for cycling and thermal runaway experiments,data analysis is conducted on capacity-voltage,discharge direct current internal resistance and thermal runaway temperature variations of the batteries.High-rate cycle leads to the loss of cathode active material of the battery,resulting in a decline in both the cycle performance and thermal safety.A negative correlation has been observed between the thermal safety of batteries and the rate:when the rate of the battery increases from 2.00 C to 8.00 C,the triggering temperature for thermal runaway decreases from 358.5℃ to 254.1℃.The duration time of thermal runaway shortens from 3608 s to 2980 s,while the maximum temperature rise rate increases from 34.2℃/s to 59.7℃/s during thermal runaway.

关 键 词：锂离子电池 钛酸锂Li_(4)Ti_(5)O_(12) 负极 充放电倍率 循环性能 热失控 热安全性 

分 类 号：TM912.9[电气工程—电力电子与电力传动]