普鲁士蓝
材料科学
涂层
锂(药物)
阴极
电解质
电导率
化学工程
法拉第效率
钾
复合材料
电化学
电极
冶金
物理化学
化学
内分泌学
工程类
医学
作者
Xu Zhou,Lijie Ci,Yifei Yuan,Xiangkun Nie,Jianwei Li,Jun Cheng,Qing Sun,Yamin Zhang,Guifang Han,Guanghui Min,Jun Lü
出处
期刊:Nano Energy
[Elsevier]
日期:2020-05-24
卷期号:75: 104942-104942
被引量:44
标识
DOI:10.1016/j.nanoen.2020.104942
摘要
With high specific capacity, the layered Li-rich Mn-based oxide (LRMO) is a promising candidate cathode material for Li-ion batteries. However, the irreversible release of Li-ions during the first charging process, instability of LRMO/electrolyte interface and relatively low ion conductivity of LRMO result in low initial Coulombic efficiency (ICE), poor cycle stability and rate performance, which prohibit its further application. Interface engineering via additive coating is expected to effectively address these issues. Herein, we rely on potassium Prussian blue (KPB), a Li+ acceptor with good ion conductivity, as a new coating material on LRMO particles. The KPB coating not only forms a protective layer on the surface of LRMO against electrolyte corrosion, but also functions as a host for Li+ transport and accommodation, leading to enhanced ion conductivity and ICE of LRMO cathode. Consequently, 2 wt% KPB coated LRMO cathode achieved an initial discharge capacity of up to 281.7 mA h g−1 with an ICE of 85.69% compared to an ICE of 79.52% for the LRMO cathode without coating. The cycling and rate performance are also greatly improved as evidenced by the well maintained capacity of up to 176.8 mA h g−1 after 100 cycles at a current density of 0.5 C, compared to the limited capacity of only 135.3 mA h g−1 for the LRMO cathode without coating. This work pioneers the use of potassium Prussian blue as additive coating material to enhance performance of LRMO cathode, and we expect it to inspire the battery community with new strategies of material engineering/design toward practical application in high-energy lithium-ion batteries.
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