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摘要
以镍、锰氧化物和碳酸锂为原料,采用高温固相法直接合成高电压正极材料镍锰酸锂LiNi0.5Mn1.5O4。主要考察了烧结温度、烧结时间和Li/M等因素对工艺的影响。结果表明:在烧结温度为800℃,烧结时间为15h,Li/M为0.53时,合成的镍锰酸锂材料的综合性能达到了最佳。在此合成条件下合成的镍锰酸锂材料的1C放电比容量为129.53mAh/g,50次循环后1C放电比容量为122.60mAh/g,50次循环容量保持率94.56%,证明电池的循环性能良好。
Abstract
Nickel,manganese oxide and lithium carbonate were used as raw materials to directly synthesize high-voltage lithium nickel manganese oxide(LiNi0.5Mn1.5O4) using high-temperature solid-phase method.The influence of factors such as sintering temperature,sintering time and Li/M on the process was mainly investigated.The results shown that when the sintering temperature was 800℃,the sintering time was 15h,and the Li/M was 0.53,the overall performance of the synthesized material reached the best.The test shown that the 1C discharge specific capacity of the material synthesized under this synthesis condition was 129.53mAh/g,the 1C discharge specific capacity after 50 cycles was 122.60mAh/g,and the capacity retention rate of 50 cycles was 94.56%,which proved the cycle performance of the battery was good.
关键词
锂电池正极材料
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镍锰酸锂
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电化学性能
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固相法
Key words
lithium-ion battery positive material
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LiNi0.5Mn1.5O4
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electrochemical property
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solid phase method
高电压正极材料镍锰酸锂的制备及性能研究[J].
化工新型材料, 2021, 49(3): 108-112 DOI:10.19817/j.cnki.issn 1006-3536.2021.03.024
[1] Zhou L,Zhang W,Wang Y,et al.Lithium sulfide as cathode materials for lithium-ion batteries:advances and challenges[J].Journal of Chemistry,2020,2020:1-17.
[2] Yu Y,Karayaylali P,Giordano L,et al.Probing depth-dependent transition-metal redox of lithium nickel,manganese,and cobalt oxides in Li-ion batteries[J].ACS Applied Materials & Interfaces,2020,12(50):55865-55875.
[3] Liu H,Li M,Xiang M,et al.Effects of crystal structure and plane orientation on lithium and nickel co-doped spinel lithium manganese oxide for long cycle life lithium-ion batteries-science direct[J].Journal of Colloid and Interface Science,2020.585:729-739.
[4] Mou J,Wu H,Deng Y,et al.BiFeO3-coated spinel LiNi0.5Mn1.5O4 with improved electrochemical performance as cathode materials for lithium-ion batteries[J].Journal of Solid State Electrochemistry,2017,21(10):2849-2858.
[5] 邓帮君,杨春,周环波.镍锰酸锂的固相法合成及结构分析[J].化工新型材料,2017,45(9):148-149,152.
[6] 卢道焕,林乔青,闫冠杰,等.固相烧结法制备改性LiNi0.5Co0.2Mn0.3O2三元材料的研究[J].电源技术,2018,42(6):815-817.
[7] 许寒,刘兴江.5V尖晶石LiNi0.5Mn1.5O4锂离子电池正极材料制备及Mn3+的影响[J].中国电子科学研究院学报,2012,7(4):335-338.
基金资助
广西高校中青年教师基础能力提升项目(2017KY0835);广西高校中青年教师基础能力提升项目(2019KY0772);广西民族师范学院2018年度科研项目(2018BS001)
