材料科学
阴极
纳米尺度
电化学
电压
电池(电)
离子
氧化还原
纳米技术
复合数
化学物理
锂(药物)
电极
化学工程
复合材料
电气工程
物理化学
热力学
冶金
化学
内分泌学
工程类
物理
功率(物理)
有机化学
医学
作者
Haocheng Guo,Zhen Wei,Kai Jia,Bao Qiu,Chong Yin,Fanqi Meng,Qian Zhang,Lin Gu,Shaojie Han,Yan Liu,Huijun Zhao,Wei Jiang,Hongfu Cui,Bao Qiu,Zhaoping Liu
标识
DOI:10.1016/j.ensm.2018.05.022
摘要
Li-rich layered oxides are promising high energy-density cathode, but will gradually become defective during cycling, thus suffer detrimental voltage decay. For countering these challenges, here we incorporate abundant nanoscale defects into materials’ lattices to construct a bulk-modified Li-rich composites via a direct in-depth chemical de-lithiation. Due to considerable subtle pre-rearrangements, the yielded complex poses certain features as the electrochemically induced hybrids, but turns out to be superior. Involving rebalanced redox activities, it preserves high specific capacities up to 287 mA h g-1 while presents starting working-potentials close to post-cycled values. Most importantly, this defective structure is capable to enhance the electrochemical stability: except good cycling performances concerning capacity, the tricky and intrinsic voltage decay can also be significantly suppressed to only a fraction of initial levels. This concept of pre-constructing nanoscale disordered system is anticipated to inspire more novel designs of composite cathodes and consequently advance the development of rechargeable lithium-ion battery techniques.
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