High-pseudocapacitance of porous and square NiO@NC nanosheets for high-performance lithium-ion batteries

• 作者: Ze-Lin Cai Zi-Lin Peng Meng-Qi Wang Jia-Yan Wu Hao-Sen Fan Yu-Fei Zhang
• 来源期刊: 稀有金属（英文版）
• 年，卷（期）: 2021,（6）
• 所属期刊栏目: EMERGING TECHNOLOGIES FOR MATERIALS DESIGN AND CHARACTERIZATION IN ELECTROCHEMICAL REACTION
• 页码范围: 1451-1458
• 页数: 8页
• 语种: 英文

摘要

Layered nickel oxides have been focused with intense research interests as high-performance lithium-ion batterie (LIB) anode.However,it is hard to obtain few layered nickel oxides material directly as it easily forms bulk material with the strong interaction between the interlayer.In this work,two-dimensional (2D) nickel-based coordination polymers were successfully prepared according to aqueous phase copolymerization approach.And then uniform carbon-doped NiO nanosheets were successfully obtained from facile solution assembly and post-thermal treatment.The detailed electrochemical testing shows that the uniform NiO nanocrystals encapsulated into porous N-doped carbon(NiO@NC) nanosheets present much higher rate capability with the discharge specific capacity of 782.7 mAh·g-1 at high current density of 2.0 A·g-1 than pure NiO (690 mAh· g-1).It also shows long-term cycling performance with 91％ retention after 50 cycles at 1.0 A·g-1.The high rate capability,cycling stability and the easy synthesis make NiO@NC nanosheets as a promising candidate for LIB anode and build up new way for the fabrication of metal oxides anode materials.