尖晶石
阴极
电解质
材料科学
X射线光电子能谱
阳极
化学工程
电子能量损失谱
容量损失
电极
化学
纳米技术
透射电子显微镜
冶金
物理化学
工程类
作者
Feng Zou,Zehao Cui,Himamshu C. Nallan,John G. Ekerdt,Arumugam Manthiram
出处
期刊:ACS applied energy materials
[American Chemical Society]
日期:2021-11-11
卷期号:4 (11): 13297-13306
被引量:11
标识
DOI:10.1021/acsaem.1c02903
摘要
The high-voltage, cobalt-free spinel cathode LiNi0.5Mn1.5O4 (LNMO) is receiving extensive attention for lithium-ion batteries due to its low cost, high operating voltage and energy density, superior power density, and good thermal stability. However, its high operating voltage hampers its stability with commercial electrolytes and makes its practical viability challenging. We present here a Mn-rich LNMO cathode to encourage the disordering of Mn and Ni in the lattice and the incorporation of a small dose of Fe into Mn-rich LNMO (Fe-LNMO) to improve the cycling stability. The introduction of Fe further increases the cation disorder between Mn and Ni, thus enabling a better rate capability. Electron energy loss spectroscopy analysis indicates that Fe is concentrated on the surface, and X-ray photoelectron spectroscopy analysis shows that Fe-LNMO alleviates the aggressive reaction between the cathode surface and the electrolyte, thus stabilizing the interface and cycle life. Furthermore, a full cell assembled with a graphite anode with an areal capacity of 3 mA h cm–2 displays a capacity retention of 90% over 300 cycles. The present work demonstrates an effective way to promote cation disordering and lower the surface reactivity of LNMO with the electrolyte, thereby enhancing the conductivity, stabilizing the cathode–electrolyte interphase, and making LNMO promising for practical applications.
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