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Study on preparation and electrochemical properties of lithium nickel cobalt aluminate modified by boric acid spray coating
Received date: 2021-03-25
Online published: 2022-03-14
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
Changwu ZOU , Jiu SUN , Weifeng FAN , Bin ZHANG , Zhengqiang WANG , Zheng ZHANG . 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 . DOI: 10.19964/j.issn.1006-4990.2021-0190
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