Abstract
LiNi0.8Co0.1Mn0.1O2(NCM811)is the most promising cathode for high-energy Li-ion batteries,despite its poor cycling stability that originates from the reactions that occur with the electrolyte.Herein,to solve this inter-facial issue,a facile electrolytic electrochemical polymer-ization process was introduced in this paper,and a uniform conductive electrolyte interface(polyaniline)was suc-cessfully constructed on the surface of the NCM811 porous electrode(PANI-NCM),which facilitated the charge transfer during charge/discharge.The side reactions at the interface between the cathode and the electrolyte are sup-pressed,and thereby,the cycling performance and rate capability are considerably improved.PANI-NCM delivers an initial capacity of 157.2 mAh·g-1 as well as excellent cyclability(capacity retention of 88％after 500 cycles at 2C),whereas the capacity of the bare NCM811 has drop-ped to 31.3 mAh·g-1.In addition,polypyrrole and polythiophene also can be formed through electrolytic electrochemical polymerization process,which provides a practicable tactic to modify the interfacial stability of cathodes for high-energy Li-ion batteries.
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