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| Main Authors: | , , , , , , , , , , , , |
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| Format: | Artículo Open Access |
| Published: |
Wiley
2025
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| Subjects: | |
| Online Access: | https://chemistry-europe.onlinelibrary.wiley.com/doi/10.1002/cssc.202501321 |
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Table of Contents:
- Nb Doping Enhancing Structure Stability and High‐Temperature Electrochemical Performances of LiFe 0.5 Mn 0.5 PO 4 Cathode Material in Lithium‐Ion Batteries Danfeng Zhang Jiaxiu Sun Zhiqi Ren Yuhang Wang Zongsheng Qiu Jianwen Yang Yongbin He Meng Qin Fei Sun Lianming Zhang Bin Huang Yanwei Li Shunhua Xiao ChemSusChem The application of LiFe 1− y Mn y PO 4 (0 < y < 1) cathode materials with high voltage and high specific energy for lithium‐ion batteries is restrained by capacity decay, structure degradation, and low Li + /electronic conductivity, especially at high temperature. In this study, the Nb 5+ ‐doped olivine‐structured LiFe 0.5 Mn 0.5− x Nb x PO 4 (LFMP‐ x Nb, x = 0%, 0.5%, 1%, 2%, and 3%) are synthesized and characterized using X‐ray diffraction, scanning electron microscopy, transmission electron microscopy, infrared spectroscopy, X‐ray photoelectron spectroscopy, and electrochemical techniques. The lattice parameters ( a , b , c , and V ), PO and TMO bond lengths, and particle size are reduced with Nb doping, and the structure stability, electronic/Li + transport rate, and electrochemical performances are improved. The preferred LFMP‐1%Nb sample delivers an initial discharge specific capacity of 160.57 mAh g −1 at 0.1 C with a coulombic efficiency of 91.38%, and a specific capacity of 91.23 mAh g −1 at 10 C, and a capacity retention rate of 78.71% with a residual capacity of 106.10 mAh g −1 after 1000 cycles at 1 C. Especially at 55 °C temperature, it can give a discharge specific capacity of 142.9 mAh g −1 and a capacity retention rate of 73.14% after 1000 cycles at 1 C. 10.1002/cssc.202501321 http://onlinelibrary.wiley.com/termsAndConditions#vor