镍
热稳定性
阴极
材料科学
电化学
煅烧
过渡金属
石墨
冶金
分析化学(期刊)
化学工程
电极
复合材料
化学
物理化学
催化作用
工程类
生物化学
色谱法
作者
Zhanning He,Maojie Zhang,Ke Zhou,Yong Cheng,Mingzeng Luo,Yu Su,Jialiang Hao,Yiou Sun,Yixiao Li,Yong Yang
出处
期刊:ACS applied energy materials
[American Chemical Society]
日期:2023-03-13
卷期号:6 (6): 3422-3431
标识
DOI:10.1021/acsaem.2c04133
摘要
Layered nickel-rich transition metal oxides have received much attention with their advantages of high specific energy density and reasonable cost. However, the large volume changes of nickel-rich materials with alternate repetition of delithiation and lithiation processes lead to particle microcracks and even fracture with severe surface reconstruction and thermal stability degradation during long-term charge–discharge cycling. Herein, we propose a codoping strategy of Mg and Ti in Li[Ni0.90Co0.05Mn0.05]O2 (NCM90), achieving excellent cyclability (98.9% versus 86.6%) after 100 cycles. The enhanced electrochemical performance is further confirmed by the ameliorated cyclability shown in the testing of an NCM∥graphite full cell. In situ X-ray diffraction and high-resolution transmission electron microscopy results reveal that cation mixing and particle fragmentation of the modified materials resulted from volume changes from the H2–H3 phase transition at a high charged state can be availably mitigated. Furthermore, the codoped NCM cathodes exhibit a well-controlled exothermic behavior at an elevated temperature, with suppressed heat release and delayed oxygen evolution. This study provides a valuable strategic guideline for the application of high-nickel cathodes in lithium-ion batteries with ideal cycling and thermal stability.
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