材料科学
钴
钨
阴极
镍
兴奋剂
烧结
容量损失
化学工程
过渡金属
动力学
电极
电化学
光电子学
催化作用
冶金
化学
物理化学
生物化学
工程类
物理
量子力学
作者
Xingyuan Wang,Bao Zhang,Zhiming Xiao,Lei Ming,Minghuang Li,Lei Cheng,Xing Ou
标识
DOI:10.1016/j.cclet.2022.107772
摘要
Owing to the further requirement for electric vehicle market, it is appropriate to lower the cost and improve the energy density of lithium-ion batteries by adopting the Co-free and Ni-rich layered cathodes. However, their practical application is severely limited by structural instability and slow kinetics. Herein, ultrahigh-nickel cobalt-free LiNi0.9Mn0.1O2 cathode is elaborate designed via in-situ trace substitution of tungsten by a wet co-precipitation method following by high-temperature sintering. It is revealed that the in-situ doping strategy of high valence W6+ can effectively improve the structure stability by reducing irreversible phase transition and suppressing the formation of microcracks. Moreover, the transformed fine particles determined by W-doping can facilitate the kinetic characteristics by shortening Li+ diffusion paths. As expected, 0.3 mol% W-doped LiNi0.9Mn0.1O2 cathode exhibits a high specific capacity of 143.5 mAh/g after 200 cycles at high rate of 5 C in the wide potential range of 2.8-4.5 V, representing a potential next-generation cathode with low-cost, high energy-density and fast-charging capabilities.
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