Mn-doped LiFePO4@C as a high-performance cathode material for lithium-ion batteries--颗粒学报PARTICUOLOGY

Chen, W., Song, F., Yang, Y., & Chen, Q. (2024). Mn-doped LiFePO4@C as a high-performance cathode material for lithium-ion batteries. Particuology, 90, 418-428. https://doi.org/10.1016/j.partic.2024.01.012

Mn-doped LiFePO₄@C as a high-performance cathode material for lithium-ion batteries

Wenjing Chen^a, Fangxiang Song^a, Yumei Yang ^a, Qianlin Chen ^{a b *}

a School of Chemistry and Chemical Engineering, Guizhou University, Guiyang, 550025, China
b Collaborative Innovation Center of Guizhou Province for Efficient Utilization of Phosphorus and Fluorine Resources, Guizhou University, Guiyang, 550025, China

10.1016/j.partic.2024.01.012

Volume 90, July 2024, Pages 418-428

Received 15 December 2023, Revised 22 January 2024, Accepted 23 January 2024, Available online 2 February 2024, Version of Record 21 February 2024.

E-mail: cql1018@163.com

Highlights

• Effect of Mn doping amount on LiFePO₄@C cathode material was studied.

• The Mn-doped LiFePO₄@C electrode holds great lithium storage performance.

• The prepared sample exhibits excellent cycle stability and rate performance at high temperature.

Abstract

In this work, LiFe_1-xMn_xPO₄@C (x = 0, 0.01, 0.02, 0.03) cathode materials were obtained by a simple co-precipitation method and heat treatment, and the influence of Mn-doped modification on the electrochemical performance of LiFePO₄@C cathode materials was investigated. Results show that by doping an appropriate amount of Mn, the cell volume became larger, and the electronic conductivity increased, which improved the Li⁺ diffusion rate and thus its rate capability and cycle performance of Li-ion batteries. Among them, LiFe_0.98Mn_0.02PO₄@C showed superior lithium storage capability; the discharge capacity can reach 150.7 mAh g⁻¹ at 0.1 C. The cell could discharge up to 155.9 mAh g⁻¹ at 1 C under high temperature at 45 °C, which was higher than LiFePO₄@C (142 mAh g⁻¹) under the same test conditions. The discharge capacity of 1 C at room temperature was 139.9 mAh g⁻¹, and the cycle stability was 95.9% after 200 cycles. It showed that it had good rate capability and excellent cycle performance. These results indicate that Mn-doped LFP is a simple and effective strategy for developing high-performance cathode materials.

Graphical abstract

Keywords

Mn-doped; LiFePO₄; Lithium-ion battery; High temperature

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