Premium
SnS 2 /N‐Doped Graphene as a Superior Stability Anode for Potassium‐Ion Batteries by Inhibiting “Shuttle Effect”
Author(s) -
Sheng Chuanchao,
Zhang Chaofei,
Shen Xiaoxiao,
Zhao Shulin,
Fu Lijun,
Wu Yuping,
Wang Jing,
Chen Yuhui
Publication year - 2020
Publication title -
batteries and supercaps
Language(s) - English
Resource type - Journals
ISSN - 2566-6223
DOI - 10.1002/batt.201900104
Subject(s) - anode , graphene , materials science , tin , sulfide , polysulfide , potassium , doping , lithium (medication) , chemical engineering , tin oxide , oxide , graphite , inorganic chemistry , nanotechnology , electrode , chemistry , composite material , metallurgy , optoelectronics , medicine , endocrinology , electrolyte , engineering
Potassium‐ion batteries are promising supplements to lithium‐ion batteries considering the abundance of potassium. However, the high reactivity of metallic potassium and low capacity of graphite anode are great challenges. A high capacity anode material is desired. Herein, we synthesize a tin sulfide/N‐doped reduced graphene oxide composite (SnS 2 /N‐rGO), in which tin sulfide nanoparticles are dispersed on the N‐doped graphene layer. It shows a high reversible capacity of 645.2 mAh g −1 at 50 mA g −1 and 402 mAh g −1 at 1 A g −1 . In situ X‐ray powder diffraction of the discharge process is carried out. KSn forms as a final product and K 2 S 5 forms as an important discharge intermediate. Nitrogen‐doping immobilizes the tin sulfide particles and inhibits the loss of polysulfide intermediate. Therefore, 97.3 % of discharge capacity remains after 100 cycles. This result sheds light on the rational design of anode materials with large volume change for potassium ion batteries.