Effects of Li2MnO3 coating on the high-voltage electrochemical performance and stability of Ni-rich layer cathode materials for lithium-ion batteries
作者： Honglong Zhang , Bing Li , Jing Wang , Bihe Wu , Tao Fu
DOI: 10.1039/C5RA26897D
关键词: Composite material 、 Coating 、 High voltage 、 Lithium 、 Cathode 、 Layer (electronics) 、 Surface modification 、 Electrochemistry 、 Differential scanning calorimetry 、 Materials science
摘要: Both the high-voltage electrochemical performance improvement and storage of Ni-rich layer cathode materials have been investigated. The is achieved by a surface modification, involving Li2MnO3 as coating layer. Owing to composite structure, material has stable interface, resulting in cycling (the initial discharge capacities 202.5 mA h g−1 capacity retention 86.4% over 50 cycles at 3.0–4.5 V vs. Li/Li+). differential scanning calorimetry (DSC) measurements show that improved presents much lower calorific value than pristine material. perfect properties are still maintained after exposed air for 2 months. Fourier-transform infrared (FT-IR) spectroscopic analysis indicates formation Li2CO3 on suppressed. Obviously, as-improved maintains features easier be stored.
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