• 文献标题:   Cascading Boost Effect on the Capacity of Nitrogen-Doped Graphene Sheets for Li- and Na-Ion Batteries
  • 文献类型:   Article
  • 作  者:   TIAN LL, LI SB, ZHANG MJ, LI SK, LIN LP, ZHENG JX, ZHUANG QC, AMINE K, PAN F
  • 作者关键词:   nitrogendoped graphene, cyclic performance, lithium ion battery, sodium ion battery, firstprinciples calculation, capacity boost
  • 出版物名称:   ACS APPLIED MATERIALS INTERFACES
  • ISSN:   1944-8244
  • 通讯作者地址:   Peking Univ
  • 被引频次:   23
  • DOI:   10.1021/acsami.6b07390
  • 出版年:   2016

▎ 摘  要

Specific capacity and cyclic performance are critically important for the electrode materials of rechargeable batteries. Herein, a capacity boost effect of Li- and Na-ion batteries was presented and clarified by nitrogen-doped graphene sheets. The reversible capacities progressively increased from 637.4 to 1050.4 mAh g(-1) (164.8% increase) in Li-ion cell tests from 20 to 185 cycles, and from 187.3 to 247.5 mAh g(-1) (132.1% increase) in Na-ion cell tests from 50 to 500 cycles. The mechanism of the capacity boost is proposed as an electrochemical induced cascading evolution of graphitic N to pyridinic and/or pyrrolic N, during which only these graphitic N adjacent pyridinic or pyrrolic structures can be taken precedence. The original and new generated pyridinic and pyrrolic N have strengthened binding energies to Li/Na atoms, thus increased the Li/Na coverage and delivered a progressive capacity boost with cycles until the entire favorable graphitic N transform into pyridinic and pyrrolic N.