硼酸喷雾包覆改性镍钴铝酸锂的制备及其电化学性能研究

doi:10.19964/j.issn.1006-4990.2021-0190

Abstract

Abstract:

Boric acid spray coating was used to modify lithium nickel-cobalt aluminate（NCA） ternary cathode materials for their poor cycle life and poor slurry stability.The properties of boric acid coated materials were characterized and analyzed by X-ray diffraction（XRD）,scanning electron microscopy（SEM）,transmission electron microscopy（TEM） and electrochemical tests.The results showed that a protective layer could be formed on the surface of NCA cathode material after spray coating,and the cycle life of NCA ternary-element cathode material after modification was significantly improved,especially the capa-city retention rate of 1C/1C 50 cycles at high temperature（45 ℃） was increased from 88.0% to 95.2% after modification,in-creasing by nearly 7 percentage points.Boric acid coating could improve the surface characteristics of NCA and greatly impro-ved the stability of positive electrode paste.The modified NCA positive electrode paste could be stably placed for 168 h （7 d）,which solved the problem that NCA positive electrode material was easy to gel.

Key words: lithium nickel-cobalt aluminate, spray coating, boric acid

CLC Number:

TQ131.11

ZOU Changwu,SUN Jiu,FAN Weifeng,ZHANG Bin,WANG Zhengqiang,ZHANG Zheng. Study on preparation and electrochemical properties of lithium nickel cobalt aluminate modified by boric acid spray coating[J]. Inorganic Chemicals Industry, 2022, 54(1): 66-70.

Figures/Tables 8

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Study on preparation and electrochemical properties of lithium nickel cobalt aluminate modified by boric acid spray coating

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