Improved electrochemical performance of the LiNi_0.8Co_0.1Mn_0.1O₂ material with lithium-ion conductor coating for lithium-ion batteries

The LiNi_0.8Co_0.1Mn_0.1O₂ was coated by a lithium-ion conductor Li₃PO₄ layer using a simple and efficient coating method. The Ni_0.8Co_0.1Mn_0.1(OH)₂ precursor serves as a coating target, and Li₃PO₄ was deposited on its surface. This method avoids forming lithium residuals and twice calcination process. The electrochemical measurements demonstrated the electrochemical performance of LiNi_0.8Co_0.1Mn_0.1O₂ is greatly enhanced by coating with lithium ion conductor Li₃PO₄, especially at high work potential. It can be ascribed to the Li₃PO₄ acted as a protection layers to reduce the side reactions between the cathode material and electrolyte, and therefore reduced the surface and charge transfer resistance during cycling. Besides that, the high lithium ion conductor characteristics of Li₃PO₄ coating layer are beneficial to improve the diffusion coefficient of lithium ions.