材料科学
掺杂剂
阴极
兴奋剂
电化学
开裂
化学工程
纳米技术
光电子学
复合材料
电极
电气工程
工程类
物理化学
化学
作者
Kuan Wang,Hui Wan,Pengfei Yan,Xiao Chen,Junjie Fu,Zhixiao Liu,Huiqiu Deng,Fei Gao,Manling Sui
标识
DOI:10.1002/adma.201904816
摘要
Abstract As a widely used approach to modify a material's bulk properties, doping can effectively improve electrochemical properties and structural stability of various cathodes for rechargeable batteries, which usually empirically favors a uniform distribution of dopants. It is reported that dopant aggregation effectively boosts the cyclability of a Mg‐doped P2‐type layered cathode (Na 0.67 Ni 0.33 Mn 0.67 O 2 ). Experimental characterization and calculation consistently reveal that randomly distributed Mg dopants tend to segregate into the Na‐layer during high‐voltage cycling, leading to the formation of high‐density precipitates. Intriguingly, such Mg‐enriched precipitates, acting as 3D network pillars, can further enhance a material's mechanical strength, suppress cracking, and consequently benefit cyclability. This work not only deepens the understanding on dopant evolution but also offers a conceptually new approach by utilizing precipitation strengthening design to counter cracking related degradation and improve high‐voltage cyclability of layered cathodes.
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