Improving the cycling stability and rate capability of LiMn0.5Fe0.5PO4/C nanorod as cathode materials by LiAlO2 modification

Ting-Feng Yi; Ying Li; Zikui Fang; Ping Cui; Shaohua Luo; Ying Xie

Journal of Materiomics (Mar 2020)

Improving the cycling stability and rate capability of LiMn0.5Fe0.5PO4/C nanorod as cathode materials by LiAlO2 modification

Ting-Feng Yi,
Ying Li,
Zikui Fang,
Ping Cui,
Shaohua Luo,
Ying Xie

Affiliations

Ting-Feng Yi: School of Materials Science and Engineering, Northeastern University, Shenyang, 110819, China; School of Resources and Materials, Northeastern University at Qinhuangdao, Qinhuangdao, 066004, China; Key Laboratory of Dielectric and Electrolyte Functional Material Hebei Province, Qinhuangdao, China; Corresponding author. School of Materials Science and Engineering, Northeastern University, Shenyang, 110819, China.
Ying Li: School of Materials Science and Engineering, Northeastern University, Shenyang, 110819, China; School of Resources and Materials, Northeastern University at Qinhuangdao, Qinhuangdao, 066004, China
Zikui Fang: School of Chemistry and Chemical Engineering, Anhui University of Technology, Maanshan, Anhui, 243002, China
Ping Cui: School of Chemistry and Chemical Engineering, Anhui University of Technology, Maanshan, Anhui, 243002, China
Shaohua Luo: School of Materials Science and Engineering, Northeastern University, Shenyang, 110819, China; School of Resources and Materials, Northeastern University at Qinhuangdao, Qinhuangdao, 066004, China; Key Laboratory of Dielectric and Electrolyte Functional Material Hebei Province, Qinhuangdao, China
Ying Xie: Key Laboratory of Functional Inorganic Material Chemistry, Ministry of Education, School of Chemistry and Materials Science, Heilongjiang University, Harbin, 150080, China; Corresponding author.

Journal volume & issue: Vol. 6, no. 1
pp. 33 – 44

Abstract

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LiMn0.5Fe0.5PO4 (LMFP)@C and LMFP@LiAlO2@C nanorods are successfully synthesized by a solvothermal process followed by a calcination at H2/Ar atmosphere. The carbon coating and LiAlO2 coating does not change the morphology and particle size of LMFP, and all samples show nanorod morphology with 50–100 nm in width and 200–300 nm in length. The results show that LiAlO2 coating can offer rapid charge transfer channels with improved intercalation/de-intercalation kinetics of Li ions, which make an outstanding rate capability and cycling stability of as-synthesized LMFP@LiAlO2@C cathodes. As a result, LiAlO2 coating effectively improves the rate capability and cycling stability of LMFP cathode even at high discharge rates. Hence, LMFP@LiAlO2 (5 wt%)@C indicates an outstanding rate performance with a reversible discharge capacity of 137.6 and 113.2 mAh g−1 discharged at 0.05 C and 5 C rates, and the composite also shows a good cycle performance with an excellent capacity of 107 mAh g−1 and 86.4% capacity retention rate at 5 C rate after 100 cycles. Therefore, the LiAlO2 coating can be considered as an effective way to improve the electrochemical properties of LMFP. Keywords: LiAlO2, LiMn0.5Fe0.5PO4, Cycling stability, Cathode material, Li-ion battery

Published in Journal of Materiomics

ISSN: 2352-8478 (Print); 2352-8486 (Online)
Publisher: Elsevier
Country of publisher: Netherlands
LCC subjects: Technology: Electrical engineering. Electronics. Nuclear engineering: Materials of engineering and construction. Mechanics of materials
Website: https://www.sciencedirect.com/journal/journal-of-materiomics

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