电解质
材料科学
阴极
石墨
电极
电池(电)
插层(化学)
化学工程
离子
剥脱关节
无机化学
纳米技术
石墨烯
复合材料
化学
有机化学
物理化学
工程类
功率(物理)
物理
量子力学
作者
Wenhao Li,Qiu‐Li Ning,Xiao‐Tong Xi,Bao‐Hua Hou,Jin‐Zhi Guo,Yang Yang,Bin Chen,Xing‐Long Wu
标识
DOI:10.1002/adma.201804766
摘要
Abstract Conventional ion batteries utilizing metallic ions as the single charge carriers are limited by the insufficient abundance of metal resources. Although supercapacitors apply both cations and anions to store energy through absorption and/or Faradic reactions occurring at the interfaces of the electrode/electrolyte, the inherent low energy density hinders its application. The graphite‐cathode‐based dual‐ion battery possesses a higher energy density due to its high working potential of nearly 5 V. However, such a battery configuration suffers from severe electrolyte decomposition and exfoliation of the graphite cathode, rendering an inferior cycle life. Herein, a new surface‐modification strategy is developed to protect the graphite cathode from the anion salvation effect and the deposition derived from electrolyte decomposition by generating an artificial solid electrolyte interphase (SEI). Such SEI‐modified graphite exhibits superior cycling stability with 96% capacity retention after 500 cycles under 200 mA g −1 at the upper cutoff voltage of 5.0 V, which is much improved compared with the pristine graphite electrode. Through several ex situ studies, it is revealed that the artificial SEI greatly stabilizes the interfaces of the electrode/electrolyte after reconstruction and gradual establishment of the optimal anion‐transport path. The findings shed light on a new avenue toward promoting the performance of the dual‐ion battery (DIB) and hence to make it practical finally.
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