材料科学
阴极
离子
相间
芯(光纤)
壳体(结构)
高能
化学工程
工程物理
复合材料
物理化学
有机化学
遗传学
化学
生物
工程类
作者
Zhiwei Jing,Suning Wang,Qiang Fu,Volodymyr Baran,Akhil Tayal,Nicola Casati,Alexander Missyul,Laura Simonelli,Michael Knapp,Fujun Li,Helmut Ehrenberg,Sylvio Indris,Chongxin Shan,Weibo Hua
标识
DOI:10.1016/j.ensm.2023.102775
摘要
Li-rich or Ni-rich layered oxides are considered ideal cathode materials for high-energy Li-ion batteries (LIBs) owing to their high capacity (> 200 mAh g–1) and low cost. However, both are suffering from severe structural instability upon high-voltage cycling (> 4.5 V). Here, “Li-rich Ni-rich” Li1.08Ni0.9Mn0.1O2 oxides with core-shell architecture are designed and synthesized to improve their high-voltage cyclability. These oxides are determined to be composed of a less reactive “Li-rich Mn-rich” shell and a high-capacity “Li-rich Ni-rich” core. As Li-ions gradually enter into the core-shell precursor during high-temperature lithiation reaction, the interdiffusion of elements across the interphase between the Mn-rich shell and the Ni-rich core successively occurs. Such thermally-driven atomic interdiffusion could lead to a thickness-controllable “Li-rich Mn-rich” shell, which can guarantee an exceptional structural reversibility for the layered “Li-rich Ni-rich” core upon long-term cycling. As a consequence, the optimized core-shell Li1.08Ni0.9Mn0.1O2 achieves a capacity retention of 96% at 0.1 C after 100 cycles in the voltage range of 2.7–4.6 V. These findings might open up a new avenue for rational design of advanced cathode materials for LIBs and beyond.
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