Mg-doped LiMnPO₄/C cathode materials for enhanced lithium storage performance

ABSTRACT

Mg-doped LiMn_1-xMg_xPO₄/C (x= 0, 0.01, 0.03 and 0.05) compounds were synthesised using a ball-milling-assisted solid-state reaction. The influence of the Mg-doping on the structure, morphology and electrochemical performance of LiMnPO₄ were systematically investigated. The XRD results demonstrated that the obtained LiMn_1-xMg_xPO₄/C products possess a single olivine-type structure. Particularly, the desired LiMn_1-xMg_xPO₄/C compounds exhibited the enhanced specific capacity and cycling performance over the undoped LiMnPO₄/C. An initial capacity of 131.1 mAh/g was achieved for the LiMn_0.97Mg_0.03PO₄/C composite, and it retained 116.9 mAh/g over 30 cycles at a charge-discharge rate of 0.05 C. It can be expected that the Mg-doped LiMnPO₄/C is a kind of promising cathode materials for high-performance lithium-ion batteries.

KEYWORDS:

• Lithium-ion battery
• cathode material
• Mg-doping
• limnpo₄

Disclosure Statement

No potential conflict of interest was reported by the authors.

Additional information

Funding

This work was supported by National Science Foundation of China [51774207], and Scientific Research Foundation of Hainan Tropical Ocean University [NO. RHDRC2020XX].