Research progress on Li- and Mn-rich cathode materials for lithium-ion batteries

Abstract

As the development of society, the specific energy density of the commercial lithium-ion battery still cannot meet the requirements for practical applications, such as electric vehicles, 3C(computer, communication and consumer electronics) products and energy storage devices. The Li- and Mn-rich cathode materials are expected to be the key electrode materials for high energy density lithium-ion battery due to their high electrochemical capacity (≈250 mAh/g), high operating voltage(≈3.6 V) and low cost. However, several issues and challenges limit their widespread applications for commercial lithium-ion battery, including high irreversible capacity, poor cycle life and fast voltage/capacity fading. In this paper, the latest research progress of Li- and Mn-rich cathode materials is reviewed, with emphasis on material structure, electrochemical reaction mechanism, failure mechanism and modification technology. The results show that ion doping, surface coating, crystal structure regulation and other techniques can significantly improve the electrochemical performance of Li and Mn-rich cathode materials. Finally, the development direction of Li- and Mn-rich cathode materials is prospected.