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材料导报  2021, Vol. 35 Issue (12): 12027-12031    https://doi.org/10.11896/cldb.20110085
  无机非金属及其复合材料 |
熔盐法制备LiNi0.8Co0.1Mn0.1O2单晶及其电化学性能
何康宇, 曹博凯, 莫岩, 陈永
海南大学,海南省硅锆钛综合开发与利用重点实验室,南海海洋资源利用国家重点实验室,海口 570228
Synthesis of LiNi0.8Co0.1Mn0.1O2 Single Crystal by Molten Salt Method and Its Electrochemical Performance
HE Kangyu, CAO Bokai, MO Yan, CHEN Yong
Hainan Provincial Key Laboratory of Research on Utilization of Si-Zr-Ti Resources, State Key Laboratory of Marine Resource Utilization in South China Sea, Hainan University, Haikou 570228, China
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摘要 高镍三元正极材料LiNi0.8Co0.1Mn0.1O2因具有高能量密度、环境友好等特性,一直受到工业界和科研人员的关注。然而,它在长循环过程中会产生微裂纹及容量衰减,且循环性能差,制约了其商业化应用。为了改善这些性能,本实验采用辅助熔盐法在775 ℃烧结制备了LiNi0.8Co0.1-Mn0.1O2单晶材料(SC-NCM811),并对其形貌、结构和电化学行为进行了系统研究。该单晶材料分散性好,颗粒尺寸在2~3 μm。在10C电流密度下容量达111.3 mAh·g-1,100次循环后放电比容量为106.8 mAh·g-1,容量保持率为95.9%,明显优于二次球状材料(100次循环后的容量保持率为89.7%)。电化学阻抗和循环伏安结果表明,SC-NCM在很大程度上减缓了循环过程中的极化程度以及电荷传递阻抗的增加,进而提高了材料的循环稳定性,是一种很有前途的锂离子电池正极材料。
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何康宇
曹博凯
莫岩
陈永
关键词:  高镍三元  单晶  熔盐法  倍率性能    
Abstract: Ni-rich layered cathodes LiNi0.8Co0.1Mn0.1O2 receive much research interest for Li-ion batteries due to the environmental friendless and high energy density. However, spherical LiNi0.8Co0.1Mn0.1O2 materials often suffer capacity fading ascribed to microcracks generated from volume variation upon cycling, which hindered their commercial applications. To overcome this inherent instability, the single crystal LiNi0.8Co0.1-Mn0.1O2 (SC-NCM811) has been synthesized via assisted molten salt method with excess amounts of Li2CO3, and its morphology, structure and electrochemical behavior have been systematically investigated. The SEM observation confirms that it composes of dispersed near-brick particles with an average size of about 2—3 μm. Compared to spherical LiNi0.8Co0.1Mn0.1O2, the SC-NCM811 materials shows improved capacity retention from 89.7% to 95.9% with an exceptionally high capacity of 111.3 mAh·g-1 at 10C. The EIS and CV results demonstrate that the enhanced electrochemical properties are attributed to decrease in polarization and suppression of impedance increment during cycling due to the unique morpho-logy structure of SC-NCM. The results of this work indicate that SC-NCM is a promising cathode material for Li-ion batteries.
Key words:  high nickel ternary    single crystal    molten salt method    high rate performance
               出版日期:  2021-06-25      发布日期:  2021-07-01
ZTFLH:  TM912.9  
基金资助: 国家自然科学基金(52062012);科技发展专项基金(ZY2019HN0906)
通讯作者:  ychen2002@163.com   
作者简介:  何康宇,2018年9月入学海南大学材料科学与工程学院,攻读硕士研究生,主要从事镍钴锰三元正极材料研究。
陈永,教授/博士研究生导师,博士,海南大学材料科学与工程学院副院长;海南省硅锆钛综合开发与利用重点实验室主任;南海海洋资源利用国家重点实验室海洋能源利用研究团队负责人。主要研究集中在新型储能材料,包括锂离子电池和超级电容器。发表论文140余篇,主持国家自然基金、省创新团队、重点项目和国际合作项目等20余项,申请专利25项。
引用本文:    
何康宇, 曹博凯, 莫岩, 陈永. 熔盐法制备LiNi0.8Co0.1Mn0.1O2单晶及其电化学性能[J]. 材料导报, 2021, 35(12): 12027-12031.
HE Kangyu, CAO Bokai, MO Yan, CHEN Yong. Synthesis of LiNi0.8Co0.1Mn0.1O2 Single Crystal by Molten Salt Method and Its Electrochemical Performance. Materials Reports, 2021, 35(12): 12027-12031.
链接本文:  
http://www.mater-rep.com/CN/10.11896/cldb.20110085  或          http://www.mater-rep.com/CN/Y2021/V35/I12/12027
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