高申星,何子超,李胜春,范鹏,常丽娟

• 1:河南省计量测试科学研究院
• 2:河南省有色金属地质矿产局第五地质大队
• 3:天齐鑫隆科技(成都)有限公司

摘要(Abstract)：

采用固相烧结+高速气流雾化工艺制备LiNi_(0.5)Mn_(1.5)O_4正极材料，采用液相离子掺杂方式制备Mg、F掺杂的LiNi_(0.5)Mn_(1.5)O_4材料。利用SEM、XRD、DLS等对材料微观形貌、结构、粒度分布进行表征，利用恒流充放电测试研究电化学性能。结果表明，与未掺杂样品相比，Mg、F掺杂的LiNi_(0.5)Mn_(1.5)O_4电极具有优异的倍率性能(5 C放电比容量为114.12 mAh/g)和循环稳定性(1 C条件下150次充放电后，容量保持率在96.5%)。Mg、F掺杂的LiNi_(0.5)Mn_(1.5)O_4材料纳米化程度提高、结构稳定性增强、界面阻抗降低，从而材料的高倍率放电及循环性能得到了提升。文章提供了一种改善镍锰酸锂极材料电化学性能的有效途径，具有较高的市场推广价值。

关键词(KeyWords)： 锂离子电池;镍锰酸锂;液相掺杂;高倍率;循环性能

Abstract:

Keywords:

基金项目(Foundation): 四川省科技计划重点研发项目(2020ZHCG0024)

作者(Author): 高申星,何子超,李胜春,范鹏,常丽娟

DOI: 10.19996/j.cnki.chinbatlnd.2023.04.003

参考文献(References)：

• [1] 刘云建，陈效华，刘志远，等.不同前躯体制备的LiNi0.5Mn1.5O4性能研究[J].电池工业，2012,17(5):259-262.
• [2] 伊廷锋，岳彩波，何孝军，等.LiNi0.5Mn1.5O4材料合成及性能的研究综述[J].电池工业，2008,13(4):262-255.
• [3] 杨鑫，陈娟，常海涛.锂离子电池正极钴酸锂研究过展[J].电池工业，2022,26(1):26-29,46.
• [4] 顾婷婷，辛煜，王海波，等.锂离子电池高电压正极材料LiNi0.5Mn1.5O4的铬氧化物表面包覆研究[J].电池工业，2019,23(1):8-11.
• [5] YANG T,ZHANG N,LANG Y,et al.Enhanced rate performance of carbon-coated LiNi0.5Mn1.5O4 cathode material for lithium ion batteries[J].Electrochimica Acta,2011,56(11):4058-4064.
• [6] FAN Y,WANG J,TANG Z,et al.Effects of the nanostructured SiO2 coating on the performance of LiNi0.5Mn1.5O4 cathode materials for high-voltage Li-ion batteries[J].Electrochimica Acta,2007,52(11):3870-3875.
• [7] LI S,LIANG W,XIE J,et al.Synthesis of hollow microspheres LiNi0.5Mn1.5O4 coated with Al2O3 and characterization of the electrochemical capabilities[J].Journal of Electrochemical Energy Conversion and Storage,2020,17(3):031007.
• [8] 刘相涛，刘相镇，刘立健.Mg掺杂对LiNi0.4Co0.2Mn0.4-xMgxO2结构和性能影响[J].电池工业，2018,18(3/4):119-123.
• [9] 庞佩佩，唐致远，袁秀兰.5 V LiNi0.5Mn1.5O4正极材料掺杂改性研究[J].电池工业，2010,15(3):160-163.
• [10] LIU M H,HUANG H T,LIN C M,et al.Mg gradient-doped LiNi0.5Mn1.5O4 as the cathode material for Li-ion batteries[J].Electrochimica Acta,2014,120:133-139.
• [11] YI T F,MEI J,ZHU Y R.Key strategies for enhancing the cycling stability and rate capacity of LiNi0.5Mn1.5O4 as high-voltage cathode materials for high power lithium-ion batteries[J].Journal of Power Sources,2016,316:85-105.
• [12] LI X,ZHANG Y,LI W,et al.The synergetic effect of LiMg0.5Mn1.5O4 coating and Mg2+ doping on improving electrochemical performances of high-voltage LiNi0.5Mn1.5O4 by sol-gel self-combustion method[J].Chemistry Select,2020,5(8):2593-2601.
• [13] LUO Y,LI H,LU T,et al.Fluorine gradient-doped LiNi0.5Mn1.5O4 spinel with improved high voltage stability for Li-ion batteries[J].Electrochimica Acta,2017,238:237-245.
• [14] OH S W,PARK S H,KIM J H,et al.Improvement of electrochemical properties of LiNi0.5Mn1.5O4 spinel material by fluorine substitution[J].Journal of Power Sources,2006,157(1):464-470.