文献类型：期刊文献

英文题名：Rational design of high nitrogen-doped and core-shell/mesoporous carbon nanospheres with high rate capability and cycling longevity for pseudocapacitive sodium storage

作者：Mao, Jiayi[1];Niu, Dechao[1];Jiang, Nan[1];Jiang, Guangyu[1];Chen, Meiwan[1];Li, Yongsheng[1];Shi, Jianlin[1,2]

机构：[1]East China Univ Sci & Technol, Lab Low Dimens Mat Chem, Sch Mat Sci & Engn, Key Lab Far Ultrafine Mat,Minist Educ, Shanghai 200237, Peoples R China;[2]Chinese Acad Sci, Shanghai Inst Ceram, State Key Lab High Performance Ceram & Superfine, Shanghai 200050, Peoples R China

年份：2020

卷号：8

期号：19

起止页码：9768

外文期刊名：JOURNAL OF MATERIALS CHEMISTRY A

收录：;EI(收录号：20202308783962);WOS:【SCI-EXPANDED(收录号:WOS:000536690000028)】；

基金：This work was financially supported by the National Key Research and Development Program of China (Grant No. 2016YFA0203700); The National Natural Science Foundation of China (No. 51621002 and 51672083); Program of Shanghai Academic/Technology Research Leader (18XD1401400); Basic Research Program of Shanghai (17JC1404702); Leading talents in Shanghai in 2018; The Program for Professor of Special Appointment (Eastern Scholar) at Shanghai Institutions of Higher Learning and the 111 project (B14018).

语种：英文

外文关键词：Cost effectiveness - Doping (additives) - Shells (structures) - Sodium-ion batteries - Amines - Carbon - Block copolymers - Nanospheres - Metal ions - Nitrogen

摘要：Carbonaceous materials are extensively used as sodium-ion battery (SIB) anodes for their cost-effectiveness, high conductivity and reasonably high capacity. Unfortunately, these anodes suffer from poor rate performances and unsatisfactory lifespan. Herein, the design and construction of high nitrogen-doped, core-shell and intra-core mesoporous structured carbon nanospheres (designated as HN-CSMCNs) for high-rate and stable SIBs is reported. HN-CSMCNs are facilely synthesized by the self-assembly of block copolymer polystyrene-b-poly(acrylic acid), cetyltrimethylammonium bromide and dopamine hydrochloride, and subsequent pyrolysis under an NH3 atmosphere. As an anode for SIBs, HN-CSMCNs exhibit outstanding specific capacity (ca. 251 mA h g(-1) at 0.1 A g(-1)), rate capability (ca. 104 mA h g(-1) at 15 A g(-1)), and more importantly, especially stable cycling properties with a capacity of ca. 153 mA h g(-1) being retained after 20 000 cycles at 10 A g(-1). Electrochemical analysis demonstrates that the core-shell and intra-core mesoporous structures, expanded inter-planar distance and high pyrrolic/pyridinic-N doping of HN-CSMCNs together contribute to the superior sodium storage capability via a pseudocapacitive-dominated electrochemical kinetics, thus leading to superior electrochemical performances for SIBs.