Boosting the Electrochemical Performance of Regenerated LiCoO₂ Cathode <i>v</i>ia LiMgPO₄ Coating and Mg Doping

With the global shift toward renewable energy, the demand for lithium-ion batteries has surged, drawing increasing attention to the recycling of spent lithium-ion batteries. This study proposes an integrated recycling and modification strategy for regenerating LiCoO2 cathode materials from spent lithium-ion batteries. The approach involves pretreatment, water leaching, and a LiMgPO4 coating combined with Mg doping, thereby synthesizing a Mg-doped and LiMgPO4-coated LiCoO2 cathode material (MLMP-LCO). The introduction of the LiMgPO4coating and Mg doping significantly enhances the structural and interfacial stability of LiCoO2 under high-voltage conditions (4.5 V). Electrochemical tests indicate that at 0.5C, the MLMP-LCO cathode exhibits a high discharge specific capacity of 175.64 mAh/g, and after 100 cycles, its capacity retention reaches 97.42%, demonstrating excellent cycling stability. This work underscores the potential of a combined recycling and modification strategy to enhance the electrochemical performance of regenerated cathode materials, thereby offering a robust technological solution to address both the environmental and resource challenges posed by spent lithium-ion batteries and to advance sustainable energy storage applications.