前驱体对三元正极材料LiNi_(0.5)Co_(0.2)Mn_(0.3)O_2性能影响的研究
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摘要
以碳酸锂为锂源,将三种不同厂家的镍钴锰氢氧化物前驱体通过固相烧结法制备锂离子电池三元材料LiNi_(0. 5)Co_(0. 2)Mn_(0. 3)O_2(简称NCM),并用纳米氧化铝溶液对其进行了包覆。采用X射线衍射仪、扫描电子显微镜、恒电流充放电测试仪等对材料的物理和电化学性能进行分析测试。结果表明:在前驱体元素组成基本一致的情况下,包覆前后三种前驱体制备的正极材料半电池首次容量由166. 7 mAh/g、166. 0 mAh/g和166. 1 mAh/g改变为169. 8 mAh/g、167. 4 mAh/g和165. 9 mAh/g,而100周循环保持率由92. 6%、92. 3%和93. 2%上升到96. 2%、96. 0%和96. 3%。这种改善应源于包覆过程中形成的快离子导体抑制了循环过程中电池直流内阻(DCIR)的增加。但对于不同前驱体制备的正极材料,包覆后电子传导能力以及界面相容性会有所不同。
LiNi_(0. 5)Co_(0. 2)Mn_(0. 3)O_2 (NCM) cathode material was synthesized by using nickel-cobaltmanganese hydroxide and lithium carbonate through solid-state sintering reaction. Al-coating NCM samples were prepared by nano-Al_2O_3 solution and NCM. Physical and electrochemical properties of samples were measured by XRD,SEM and Charge-discharge system. The results show that for precursors with similar composition,initial capacity of the NCM samples change to 169. 8 mAh/g,167. 4 mAh/g and 165. 9 mAh/g from 166. 7 mAh/g,166. 0 mAh/g and 166. 1 mAh/g. And capacity retention of 100th cycles raise to 96. 2 %,96. 0 % and 96. 3% from 92. 6%,92. 3% and 93. 2% by coating process. This improvement may due to the formation of fast ionic conductor which reduce the DCIR (Direct Current Internal Resistance) during cycling. But for NCM which prepared by different precursors,electronic conduction ability and interfacial compatibility may different after same coating process.
LiNi_(0. 5)Co_(0. 2)Mn_(0. 3)O_2 (NCM) cathode material was synthesized by using nickel-cobaltmanganese hydroxide and lithium carbonate through solid-state sintering reaction. Al-coating NCM samples were prepared by nano-Al_2O_3 solution and NCM. Physical and electrochemical properties of samples were measured by XRD,SEM and Charge-discharge system. The results show that for precursors with similar composition,initial capacity of the NCM samples change to 169. 8 mAh/g,167. 4 mAh/g and 165. 9 mAh/g from 166. 7 mAh/g,166. 0 mAh/g and 166. 1 mAh/g. And capacity retention of 100th cycles raise to 96. 2 %,96. 0 % and 96. 3% from 92. 6%,92. 3% and 93. 2% by coating process. This improvement may due to the formation of fast ionic conductor which reduce the DCIR (Direct Current Internal Resistance) during cycling. But for NCM which prepared by different precursors,electronic conduction ability and interfacial compatibility may different after same coating process.
引文
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[2]邹兴,赵勇迪,刘帅.前驱体制备方法对电池正极材料电性能的影响[J].中国锰业,2017,35(3):118-121.
[3]张海艳,苏玉长,周勤俭.前驱体比表面积对Li Ni0.82Co0.15Mn0.03O2材料性能的影响研究[J].矿冶工程,2017,37(2):129-132.
[4]刘娇,杨晓伟.Li Mn1/3Ni1/3Co1/3O2表面混合修饰的改性研究[J].电池,2014,44(5):286-289.
[5]靳芳芳,任丽,赵德.Al2O3包覆正极材料Li Ni1/3Co1/3Mn1/3O2[J].电池,2016,46(6):306-309.
[6]王伟东,仇卫华,丁倩倩.锂离子电池三元材料-工艺技术及生产应用[M].北京:化学工业出版社,2015:188-236.
[7]刘大亮,刘亚飞,陈彦彬,等.高能量密度锂离子电池正极材料的发展趋势[J].新材料产业,2014,11:41-45.
[8]刘亚飞,陈彦彬.锂离子电池正极材料标准解读[J].储能科学与技术,2018,7(2):314-326.