(Digital Presentation) Performance Improvement of Nickel-Rich Layered Cathodes for Li Batteries Based on Modified Solid State Reaction

Abstract

Lithiated metal oxides with layered structure used as the cathode may provide a high capacity and stable cycle retention, which is a desired property for lithium-ion batteries. Among them, NMC composed of Ni, Mn and Co as transition metal ions is considered a promising positive electrode. Due to high cost and toxicity of Co, Ni-rich layered oxide with substitution of Ni for Co content shows high capacity and adequate cycling performance. Recently, the fabrication of NMC adopting single-crystal (grain size: 1~6 μm) process tends to give better long-term performance than ones with particles in nanometer range.In this study, LiNi0.8Mn0.1Co0.1O2 (NMC811) with substitution of Ni/Mn for Co were selected as the Ni-rich layered cathode investigated. Due to the low melting point of Li2CO3, the heating temperature/time of powder mixture become crucial to control the adequate grain size of to achieve better retention. The value of the I(003) /I(104) ratio in XRD pattern represent cation mixing in layered structure. And this parameter is closely related to its electrochemical properties. Discussion will be carried out based on the results of XRD analysis and the charge–discharge profiles and cycling performance.