核壳结构LiMn1-y Fe y PO4/C正极材料设计与电化学性能研究

doi:10.19799/j.cnki.2095-4239.2024.1164

摘要/Abstract

摘要：

磷酸锰铁锂(LiMn_1-_y Fe _y PO₄)相较于磷酸铁锂(LiFePO₄)展现出了更高的能量密度特性，这一优势对于提升电动汽车及便携式电子设备的续航能力和动力性能具有显著意义。然而，Mn元素的Jahn-Teller效应及其引发的溶出问题，一直制约着磷酸锰铁锂正极材料实现大规模商业化应用。本研究提出了一种核壳结构设计策略，将LiFePO₄颗粒紧密均匀地包覆在LiMn_0.7Fe_0.3PO₄内核的表面上，成功制备了“核壳结构”的LMFP55/C与LMFP64/C两种复合材料。该结构不仅有效缓解了Mn元素带来的负面效应，还进一步提升了材料的整体性能，特别是循环稳定性。制备的LMFP64/C复合材料在0.1 C的放电倍率下，展现出了154 mAh/g的优异初始放电容量。更为重要的是，在1 C的高放电倍率下，经过500次循环后，其容量保持率仍高达92%，显示出卓越的循环稳定性。

关键词: LiMn_1-_y Fe _y PO₄, 高温固相法, 正极材料, 锂离子电池

Abstract:

Lithium manganese iron phosphate (LiMn_1-_y Fe _y PO₄), which has a higher energy density than conventional lithium iron phosphate (LiFePO₄), is expected to provide enhanced endurance and higher output power for electric vehicles and portable electronics. However, the Jahn-Taylor effect associated with manganese and the consequential dissolution problems have yet to be resolved, which has severely hindered the widespread commercialization of LiMn_1-_y Fe _y PO₄ as a cathode material. In this research, we introduced a core-shell structural-design strategy that resulted in the successful fabrication of two composite materials: LMFP55/C and LMFP64/C. These composites feature a unique configuration, with LiFePO₄ particles tightly and uniformly encapsulated on the surface of a LiMn_0.7Fe_0.3PO₄ core. This innovative approach effectively neutralized the negative impact of elemental Mn while simultaneously boosting the overall performance of the materials, particularly in terms of cycling stability. Notably, the LMFP64/C composite exhibited the impressive initial-discharge capacity of 154 mAh/g at 0.1 C, and it maintained the capacity-retention rate of 92% after 500 cycles at 1 C, which demonstrates its exceptional cycling stability.

Key words: LiMn_1-_y Fe _y PO₄, high-temperature solid-phase method, cathode material, lithium-ion batteries

中图分类号:

TM 911

韩丹丹, 张武卫, 张亮, 王宗江. 核壳结构LiMn₁_-_y Fe _y PO₄/C正极材料设计与电化学性能研究[J]. 储能科学与技术, 2025, 14(6): 2215-2222.

Dandan HAN, Wuwei ZHANG, Liang ZHANG, Zongjiang WANG. Design and electrochemical performance of LiMn_1-_y Fe _y PO₄/C cathode materials with a core-shell structure[J]. Energy Storage Science and Technology, 2025, 14(6): 2215-2222.

图/表 5

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图5

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核壳结构LiMn₁_-_y Fe _y PO₄/C正极材料设计与电化学性能研究

Design and electrochemical performance of LiMn_1-_y Fe _y PO₄/C cathode materials with a core-shell structure

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