声子
热传导
离子
电子
声子散射
散射
材料科学
热导率
热失控
凝聚态物理
热的
工程物理
电池(电)
化学
物理
热力学
光学
功率(物理)
有机化学
量子力学
复合材料
作者
Xuemin Shi,Zhuangzhuang Jia,Donghai Wang,Qingsong Wang,Danqi He,Yunhui Huang
出处
期刊:ACS energy letters
[American Chemical Society]
日期:2023-10-06
卷期号:8 (11): 4540-4546
被引量:6
标识
DOI:10.1021/acsenergylett.3c01787
摘要
For lithium-ion batteries, frequent safety issues remain a huge challenge for safe applications. Herein, we focus on the coupled effect of electronic transport and phonon scattering on the thermal safety of Li[NixCoyMnz]O2 cathode materials. It is revealed that the electric conductivity of Li[NixCoyMnz]O2 doubles to 33 S/m as Ni content increases from 1/3 to 0.8. However, the closure in the band gap leads to a strong compensation of phonon scattering due to the thermal motion of lattice atoms. The collision between electrons and phonons damages the periodicity of the potential field, leading to a much stronger phonon scattering and ultimately a 22% decrease in thermal conductivity. We demonstrate that an improvement in electronic conduction can result in a stronger lattice vibration that deteriorates the thermal safety of the battery. Understanding the electronic/thermal transport mechanism provides new guidance for solving the basic issue of heat generation, which is critical for designing Li-ion batteries with high safety.
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