摘要
开发高性能和低成本的负极材料对于室温钠离子电池(SIBs)的商业化至关重要。本文以葡萄糖为碳源,采用简单的水热法合成了粒径均匀且具备多孔结构的碳纳米球,并通过KOH活化和氮、硫共掺杂对其进行改性。作为钠离子电池的负极材料,该碳纳米球在20 mAg^(-1)的电流密度下表现出高达527 mAhg^(-1)的初始比容量,并且在500 mAg^(-1)的高电流密度下经过1 000次循环之后仍保持了95.2%的初始比容量,其循环稳定性优于大多数近期报道的钠离子电池负极材料。其优异性能来源于KOH活化和异质原子掺杂所带来的丰富的孔结构,较大的层间距和良好的导电性。
Developing high performance and low cost anode materials is crucial for the practical use of sodium ion batteries(SIBs)at room temperature.Porous carbon nanospheres with a uniform diameter for use as SIB anode materials were synthesized by the hydrothermal treatment of glucose to obtain the spheres,and subsequent carbonization and modification with KOH activation and N,S co doping during or after the activation using thiourea as the N and S sources.Nanospheres doped with N and S after KOH activation have a high initial specific capacity of527mAh g1at a current density of20mA g1and an excellent cycling stability with a95.2%capacity retention after1000cycles at a high current density of500mA g1.The capacity retention rate is higher than that of most of the state of the art anode materials for SIBs.This good performance is attributed to the abundant micro pores,the enlarged interlayer spacing produced by the co doping,and the high conductivity of the carbon nanospheres.
作者
张宏伟
陆佳敏
杨乐
胡明祥
黄正宏
吕瑞涛
康飞宇
ZHANG haong-wei;LU Jia-min;YANG Le;HU Ming-xiang;HUANG Zheng-hong;LV Rui-tao;KANG Fei-yu(State Key Laboratory of New Ceramics and Fine Processing School of Materials Science and Engineering, Tsinghua University, Beijing 100084, China;Key Laboratory of Advanced Materials (MOE), School of Materials Science and Engineering,Tsinghua University, Beijing 100084, China)
出处
《新型炭材料》
SCIE
EI
CAS
CSCD
北大核心
2017年第6期517-526,共10页
New Carbon Materials
基金
973 program of China(2015CB932500,2014CB932401)
Beijing Nova Program(20161151041)
National Natural Science Foundation of China(51722207)
Tsinghua University Initiative Scientific Research Program(20151080367)~~
关键词
钠离子电池
多孔材料
掺杂
碳纳米球
Sodium-ion batteries
Porous nanomaterials
Doping
Carbon nanospheres
