1.欣旺达动力科技股份有限公司,广东 深圳 518000
2.广东工业大学材料与能源学院,广东 广州 510006
尚永亮(1988—),男,硕士研究生,工程师,主要从事锂离子动力电池的研究与开发工作。E-mail:syli66579@163.com;
施志聪(1975—),男,教授,博士生导师,主要从事锂离子电池及石墨烯等新能源材料研究,E-mail:zhicong@gdut.edu.cn。
收稿:2026-08-04,
修回:2026-09-03,
网络首发:2026-09-15,
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尚永亮, 雷京, 张望, 等. Li5FeO4补锂剂对磷酸铁锂电池电化学性能的影响[J]. 储能科学与技术, XXXX, XX(XX): 1-6. DOI: 10.19799/j.cnki.2095-4239.2026.0681. DOI:
Shang Yongliang, Lei Jing, Zhang Wang, et al. Effect of Li5FeO4 Lithium Supplement on Electrochemical Performance of Lithium Iron Phosphate Batteries[J]. Energy Storage Science and Technology, XXXX, XX(XX): 1-6. DOI: 10.19799/j.cnki.2095-4239.2026.0681. DOI:
本文以反萤石型富锂材料Li
5
FeO
4
(LFO)作为正极补锂剂,采用物理掺杂方式制备LFO-LiFePO
4
复合正极,并装配方形铝壳电池,系统探究LFO对磷酸铁锂电池电化学性能的调控作用。研究结果显示:当掺杂2 wt% LFO时,LFO能够有效弥补循环过程中的活性锂损失,改善电极界面特性,降低电荷转移阻抗(R
ct
)与直流内阻(DCR)。与基准电池相比,改性电池R
ct
下降15%,-20℃低温容量保持率提升5.4%,直流内阻降低30.1%;25℃循环2000次容量保持率提升5.7%,25℃存储180 d容量保持率提升3.6%。机理分析证实:LFO在首次充电过程中发生脱锂反应,可有效构建长效锂源储备体系,并调控固态电解质界面(SEI)膜组分与微观结构;通
过多重协同效应,显著改善LFP方形电池的低温放电能力、循环稳定性与存储性能。
This paper employs the anti-fluorite lithium-rich material Li
5
FeO
4
(LFO) as a cathode lithium supplement
and prepares LFO-LiFePO
4
composite cathodes via physical doping
followed by assembly of prismatic aluminum-shell cells to systematically investigate the regulatory effects of LFO on the electrochemical performance of lithium iron phosphate batteries. The results demonstrate that at a doping level of 2 wt% LFO
the additive effectively compensates for active lithium loss during LFP battery cycling
improves the electrode interface characteristics
and reduces both charge transfer impedance(R
ct
) and direct current resistance (DCR). Compared with the baseline cells
the modified cells exhibit a 15% decrease in R
ct
a 5.4% increase in low-temperature capacity retention at -20℃
and a 30.1% reduction in DCR. Furthermore
the capacity retention after 2000 cycles at 25℃ is improved by 5.7%
and the capacity retention after 180 days of storage at 25℃ is increased by 3.6%. Mechanistic analysis confirms that LFO undergoes delithiation during the initial charge process
establishing a long-term lithium reservoir system and modulating the composition and microstructure of the solid electrolyte interphase (SEI) film. Through multiple synergistic effects
LFO significantly improves the low-temperature discharge capability
cycling stability
and storage performance of LFP prismatic cells.
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