降级(电信)
阴极
材料科学
纳米技术
环境科学
化学工程
工程类
电气工程
作者
Yong Wang,Dechao Meng,Zhiyuan Li,Yunlu Han,Guangyu Cheng,Zhouhong Ren,Xi Liu,Ke Wang,Liwei Chen,Haitao Gu,Jingying Xie,Linsen Li
出处
期刊:ACS energy letters
[American Chemical Society]
日期:2025-02-28
卷期号:10 (3): 1457-1465
被引量:12
标识
DOI:10.1021/acsenergylett.4c03556
摘要
There is a growing awareness of degradation heterogeneity in batteries, but improvement strategies are rarely explored. Here we show that the heterogeneous degradations in high-energy Ni-rich layered oxide batteries are closely related to the initial mechanical damage of the cathode particles induced by the electrode calendering process. We further present a surface-targeted healing (TH) strategy through atomic layer deposition of Al2O3 on the most vulnerable near-surface cathode particles. Despite the localized coating, this approach mitigates particle fracture propagation, suppresses layered-to-rock-salt phase transitions, and reduces the level of transition-metal dissolution across the entire electrode. Practical pouch cells with TH-modified cathodes exhibited 78.6% capacity retention after 400 cycles at 55 °C under zero external pressure, outperforming their conventional counterparts (70.6% after 200 cycles). The work demonstrates that electrode-scale postsynthesis modifications, rather than exhaustive particle-level coatings, can effectively address degradation heterogeneity. This strategy opens avenues for designing durable high-energy batteries under aggressive operating conditions.
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