Multiple Linkage Modification of Lithium-Rich Layered Oxide LiMnNiCoO for Lithium Ion Battery.

A multiple linkage modification (MLM) method was investigated to comprehensively improve the properties of lithium-rich layered oxides. MLM LiMnNiCoO was successfully synthesized via continuous and appropriate heat treatment. The synthesized LiMnNiCoO particles were coated with a LiZrO layer and doped with Zr by using a Zr compound as the MLM reagent. The LiZrO coating layer could protect materials from the corrosion of hydrogen fluoride, and the structure of the base materials was stabilized due to Zr doping. In addition, the formation of LiZrO captured inactive residual lithium on the surface and absorbed lithium of host materials, thereby leading to the reduction in the Li/M ratio of materials and promoting the first-cycle Coulombic efficiency. The MLM material delivered the highest initial cycle Coulombic efficiency (∼85%), the best cycle and rate performance among bare and ZrO-coated particles. These results indicate that MLM is an important technique for improving the performance of electrode materials.