阴极
材料科学
电池(电)
涂层
表面改性
容量损失
同步加速器
电压
电化学
复合材料
电极
化学工程
电气工程
化学
物理
工程类
物理化学
功率(物理)
核物理学
量子力学
作者
Dong Hou,Jiaxiu Han,Chenxi Geng,Zhengrui Xu,Modhi M. AlMarzooqi,Jin Zhang,Zhijie Yang,Jungki Min,Xianghui Xiao,Olaf J. Borkiewicz,Kamila M. Wiaderek,Yijin Liu,Kejie Zhao,Feng Lin
标识
DOI:10.1073/pnas.2212802119
摘要
Ni-rich layered oxides as high-capacity battery cathodes suffer from degradation at high voltages. We utilize a dry surface modification method, mechanofusion (MF), to achieve enhanced battery stability. The simplicity, high yield, and flexibility make it cost-effective and highly attractive for processing at the industrial scale. The underlying mechanisms responsible for performance improvement are unveiled by a systematic study combining multiple probes, e.g., 3D nano-tomography, spectroscopic imaging, in situ synchrotron diffraction, and finite element analysis (FEA). MF affects the bulk crystallography by introducing partially disordered structure, microstrain, and local lattice variation. Furthermore, the crack initiation and propagation pattern during delithiation are regulated and the overall mechanical fracture is reduced after such surface coating. We validate that MF can alter the bulk charging pathways. Such a synergic effect between surface modification and bulk charge distribution is fundamentally important for designing next-generation battery cathode materials.
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