One-step multifunctional surface modification strategy enhancing cycling performance of Li-rich cathodes for lithium-ion batteries

Lithium-rich layered oxides (LROs) possess enormous potential in the new generation of high-energy lithium-ion batteries due to their high specific capacity, working voltage, and low cost. However, they still face low initial coulombic efficiency, poor cycling stability and multiplication performance, and persistent voltage decay, which seriously hinder their development in the lithium-ion battery industry. In this article, the Li 1·4 Y 0·4 Ti 1·6 (PO 4 ) 3 ionic conductive layer is constructed on the surface of LROs using surface residuals as lithium sources. Such a one-step modification method not only improves the rate performance of LROs by enhanced kinetic property of Li + , but also elongates the cycling lives at high-temp and high-rates by the inhibition of interfacial side reactions. As a result, the LRO cathode with a high initial coulombic efficiency of 89.3% and a good capacity retention of 83.2% after 200 cycles at 1C is obtained. It is noteworthy that this multifunctional surface modification strategy can stimulate the potential of LROs in lithium-ion batteries and provide a new way to stabilize their structure.