Preparation and electrochemical performance analysis of AlPO4-coated oxygen vacancy-containing LiNi0.5Co0.2Mn0.3O2 material

CHEN Kaiyu; XIA Yuhan; WANG Jiaqi; LIU Boyu; WANG Hongyu

doi:10.19799/j.cnki.2095-4239.2025.0932

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Preparation and electrochemical performance analysis of AlPO₄-coated oxygen vacancy-containing LiNi_0.5Co_0.2Mn_0.3O₂ material

Special Column of Beyond 500Wh/kg Battery | 更新时间：2026-05-28

- Preparation and electrochemical performance analysis of AlPO₄-coated oxygen vacancy-containing LiNi_0.5Co_0.2Mn_0.3O₂ material
- Energy Storage Science and Technology Vol. 15, Issue 2, Pages: 647-657(2026)
- 作者机构：
  
  青海大学机械工程学院，青海西宁 810016
- 作者简介：
- 基金信息：
- DOI：10.19799/j.cnki.2095-4239.2025.0932
  CLC： TB 34;TM 91
- Received：21 October 2025，
  
  Revised：2025-11-06，
  
  Published：28 February 2026
- 稿件说明：
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陈凯宇, 夏雨菡, 王嘉琦, 等. AlPO₄包覆含氧空位LiNi_0.5Co_0.2Mn_0.3O₂材料的制备及电化学性能[J]. 储能科学与技术, 2026, 15(2): 647-657. DOI: 10.19799/j.cnki.2095-4239.2025.0932.

CHEN Kaiyu, XIA Yuhan, WANG Jiaqi, et al. Preparation and electrochemical performance analysis of AlPO₄-coated oxygen vacancy-containing LiNi_0.5Co_0.2Mn_0.3O₂ material[J]. Energy Storage Science and Technology, 2026, 15(2): 647-657. DOI: 10.19799/j.cnki.2095-4239.2025.0932.
陈凯宇, 夏雨菡, 王嘉琦, 等. AlPO₄包覆含氧空位LiNi_0.5Co_0.2Mn_0.3O₂材料的制备及电化学性能[J]. 储能科学与技术, 2026, 15(2): 647-657. DOI: 10.19799/j.cnki.2095-4239.2025.0932. DOI：

CHEN Kaiyu, XIA Yuhan, WANG Jiaqi, et al. Preparation and electrochemical performance analysis of AlPO₄-coated oxygen vacancy-containing LiNi_0.5Co_0.2Mn_0.3O₂ material[J]. Energy Storage Science and Technology, 2026, 15(2): 647-657. DOI: 10.19799/j.cnki.2095-4239.2025.0932. DOI：

摘要

针对LiNi

0.5

0.2

0.3

(NCM523)正极材料循环容量衰减快与倍率性能差等问题，提出了一种“氧空位缺陷工程与界面保护”相结合的协同改性策略。通过NaBH

化学还原法在材料中成功引入氧空位，并在其表面构建了均匀(约10 nm)的AlPO

包覆层。通过EPR表征证实了氧空位的存在，TEM与EDS分析则证明了材料表面存在均匀的AlPO

包覆层。通过电化学测试表明，AlPO

NCM523材料在0.1 C下首次放电容量为185.9 mAh/g，在1C倍率下循环200次后容量保持率为73.66%(高于NCM523的50.84%)，并通过倍率测试证明AlPO

NCM523材料在5C的高倍率下仍具有99.6 mAh/g的可逆容量。CV与EIS测试结果展现了较低的电极极化(∆

=0.12 V)和较小的电荷转移阻抗(

=189.17 Ω)，对应着更快的动力学；氧空位被证明有利于提高电极的电子电导率。AlPO

包覆层则有效抑制了界面副反应，二者协同作用，共同提升了材料的循环稳定性和倍率性能。该策略为开发高性能、长寿命锂离子电池正极材料提供了新的思路。

Abstract

This study addresses the issues of rapid cycling capacity decay and poor rate performance in LiNi

0.5

0.2

0.3

(NCM523) cathode mate

rials by proposing a synergistic modification strategy that combines "defect engineering and interfacial protection". Using a liquid phase method

oxygen vacancies (OVs) were successfully introduced into the bulk phase

via

NaBH

chemical reduction

while a uniform

dense AlPO

coating of approximately 10 nm thick was formed on the surface. Structural characterization (EPR signal at

=2.003) confirmed the presence of OVs

while TEM and EDS analyses demonstrated uniform coverage of the AlPO

coating. Electrochemical testing demonstrated that the modified AlPO

NCM523 material exhibited an initial discharge capacity of 185.9 mAh/g at 0.1C. After 200 cycles at 1C

its capacity retention improved by 73.66% (considerably higher than the 50.84% of the pristine material)

and it maintained a reversible capacity of 99.6 mAh/g even at a high rate of 5C. CV and EIS tests revealed low electrode polarization (∆

=0.12 V) and reduced charge transfer resistance (

=189.17 Ω)

indicating considerably improved reaction kinetics. The findings indicate that OVs enhance the material's electronic conductivity while the AlPO

coating effectively suppresses interfacial side reactions. This synergistic effect improves the material's cycling stability and rate performance. This study offers insights into the development of high-performance

long-life lithium-ion battery cathode materials.

关键词

Keywords

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