化工新型材料

化工新型材料 ›› 2021, Vol. 49 ›› Issue (5) : 166-170. DOI: 10.19817/j.cnki.issn 1006-3536.2021.05.038

科学研究

二氧化铈包覆LiNi_0.8Co_0.1Mn_0.1O₂材料制备及电化学性能研究

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Synthesis and electrochemical performance of CeO₂-LiNi_0.8Co_0.1Mn_0.1O₂ cathode material

Wang Tongzhen, Cao Jun, Xie Qiannan, Liu Guoqiang

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Received		Published
2020-02-18		2021-05-20
Issue Date	Revised Date
2021-06-10	2020-02-18

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摘要

采用共沉淀法制备了Ni_0.8Co_0.1Mn_0.1(OH)₂前驱体,以Ce(NO₃)₃·6H₂O和C₆H₁₂N₄为反应试剂,通过化学浴法制得CeO₂包覆的Ni_0.8Co_0.1Mn_0.1(OH)₂材料,进一步地,在氧气氛围下将CeO₂包覆的前驱体混合Li₂CO₃煅烧得到CeO₂-LiNi_0.8Co_0.1Mn_0.1O₂复合正极材料。利用X射线衍射、扫描电镜等手段对材料的物相、形貌和元素分布等进行表征,并测试其电化学性能。结果表明:2% CeO₂包覆的正极材料在0.2C下首次放电比容量由未包覆的186.1mAh/g增加到195.8mAh/g;0.5C下循环150次后容量保持率为85.0%,其优异的电化学性能主要归因于CeO₂阻止了电解液与电极材料的直接接触、降低了电化学电阻,并可抑制副反应的发生。

Abstract

The Ni_0.8Co_0.1Mn_0.1(OH)₂ precursor was firstly prepared by the coprecipitation method,and then the CeO₂ coated Ni_0.8Co_0.1Mn_0.1(OH)₂ material was obtained via a chemical bath method by using Ce(NO₃)₃·6H₂O and C₆H₁₂N₄ as reagents.Further,the CeO₂-coated precursor and Li₂CO₃ were evenly mixed and calcined under oxygen atmosphere to get CeO₂ coated LiNi_0.8Co_0.1Mn_0.1O₂(CeO₂-LiNi_0.8Co_0.1Mn_0.1O₂) cathode material.The phase,morphology and element distribution of the cathode material were characterized by XRD,SEM and other technologies,and also investigated their electrochemical performances via galvanostatic charge/discharge instrument and electrochemical workstation.The results shown that the 2wt% CeO₂ coated composite presented superior initial discharge capability (195.8mAh/g at 0.2C),compared with uncoated cathode material (186.1mAh/g at 0.2C).Further,the 2wt% CeO₂ coated composite also exhibited better cycle property (with capacity retention of 85.0% after 150 cycles at 0.5C) to that of the uncoated cathode material.The presence of moderate CeO₂ layer between the electrolyte and electrode material can decrease the electrochemical resistance of the cathode,thus enhancing its discharge capability and stability.A reliable strategy was provided to enhance the electrochemical properties of high nickel ternary cathode materials.

关键词

共沉淀 / 包覆 / 正极材料 / 电化学性能

Key words

coprecipitation / coating / cathode material / electrochemical property

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二氧化铈包覆LiNi_0.8Co_0.1Mn_0.1O₂材料制备及电化学性能研究[J]. 化工新型材料, 2021, 49(5): 166-170 DOI:10.19817/j.cnki.issn 1006-3536.2021.05.038

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