Amorphous Li-Zr-O layer coating on the surface of high-Ni cathode materials for lithium ion batteries

摘要

Improving cycle performance and rate-capability of lithium ion batteries is necessary in moving toward their use in electric vehicles. Working towards this goal, we propose an amorphous Li-Zr-O coating on the surface of a high-Ni layered transition metal oxide (LiNi0.8Co0.1Mn0.1O2)viaa simple wet process. By using residual Li on the surface of as-prepared LiNi0.8Co0.1Mn0.1O2particles as a Li source, a non-stoichiometric Li-Zr-O compound can be successfully formed on the surface of LiNi0.8Co0.1Mn0.1O2particles at a low temperature of 400?°C. The formation of an amorphous Li-Zr-O layer is beneficial in minimizing undesirable side reactions associated with residual Li at the surface and, by extension, improving the cycle performance and rate-capability of LiNi0.8Co0.1Mn0.1O2. The amorphous Li-Zr-O coated LiNi0.8Co0.1Mn0.1O2exhibits a high reversible capacity of more than 190?mAh g?1with improved cycle performance. This simple approach offers easy control of the surface characteristics of LiNi0.8Co0.1Mn0.1O2, improving the surface stability and enhancing the thermal stability.