化工新型材料

化工新型材料 ›› 2025, Vol. 53 ›› Issue (9) : 138-143. DOI: 10.19817/j.cnki.issn1006-3536.2025.09.033

科学研究

充电截止电压对LiNi_0.08B_0.06Mn_1.86O₄正极材料电化学性能的影响

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Effect of charge cut-off voltages on the electrochemical performance of LiNi_0.08B_0.06Mn_1.86O₄ cathode material

Hu Zhe^1,2, Tao Yang^1,2, He Yinglei^1,2, Xiang Mingwu^1,2, Guo Junming^1,2, Bai Wei^1,2

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Received		Published
2024-08-08		2025-09-20
Issue Date	Revised Date
2025-09-16	2024-08-08

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摘要

采用固相燃烧法制备镍、硼共掺杂的LiNi_0.08B_0.06Mn_1.86O₄正极材料,运用X射线衍射(XRD)和扫描电镜(SEM)对其晶体结构与微观形貌进行表征,并通过恒电流充放电模式系统研究了不同充电截止电压对该正极材料电化学性能的影响,再结合循环伏安和交流阻抗对电极材料的动力学和阻抗变化进行研究。结果表明:制备的LiNi_0.08B_0.06Mn_1.86O₄正极材料属于尖晶石型结构,结晶性好,呈多面体形貌;其放电比容量和循环性能均受不同充电截止电压的影响,放电比容量随着充电截止电压的升高而提高。LiNi_0.08B_0.06Mn_1.86O₄正极材料在室温和55℃条件下的最佳充电截止电压均为4.5V,在室温和1C倍率下可释放出113mAh/g的高首次放电比容量,300次循环后容量保持率为89%,在55℃和5C倍率下仍然具有106mAh/g的首次放电比容量。

Abstract

A nickel and boron co-doped LiNi_0.08B_0.06Mn_1.86O₄ cathode material was prepared via a solid-state combustion method.Its crystal structure and micro-morphology were characterized by XRD and SEM,and the effects of different charge cut-off voltages on the electrochemical performances of the cathode material were systematically investigated by galvanostatic charge/discharge mode.Additionally,the kinetic and impedance changes of the electrode material were investigated by cyclic voltammetry and alternating current impedance.The results showed that the as-prepared LiNi_0.08B_0.06Mn_1.86O₄ cathode material possessed the spinel structure with good crystallinity and polyhedral morphology.The different charge cut-off voltages affected the discharge specific capacity and cycle performance,and the discharge specific capacity increased with the increase of charge cut-off voltage.The optimal charge cut-off voltage of LiNi_0.08B_0.06Mn_1.86O₄ cathode material at room temperature was 4.5V,and the high initial discharge specific capacity of 113mAh/g could be released at room temperature and 1 C rate.The capacity retention rate retained 89% after 300 cycles,and it still had a high initial discharge specific capacity of 106 mAh/g at 55℃ and 5C rate.

关键词

锂离子电池 / LiNi_0.08B_0.06Mn_1.86O₄ / 正极材料 / 截止电压 / 共掺杂

Key words

lithium-ion battery / LiNi_0.08B_0.06Mn_1.86O₄ / cathode material / cut-off voltages / co-doping

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充电截止电压对LiNi_0.08B_0.06Mn_1.86O₄正极材料电化学性能的影响[J]. 化工新型材料, 2025, 53(9): 138-143 DOI:10.19817/j.cnki.issn1006-3536.2025.09.033

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