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Graphitic Carbon Nanocage as a Stable and High Power Anode for Potassium‐Ion Batteries
Author(s) -
Cao Bin,
Zhang Qing,
Liu Huan,
Xu Bin,
Zhang Shilin,
Zhou Tengfei,
Mao Jianfeng,
Pang Wei Kong,
Guo Zaiping,
Li Ang,
Zhou Jisheng,
Chen Xiaohong,
Song Huaihe
Publication year - 2018
Publication title -
advanced energy materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.08
H-Index - 220
eISSN - 1614-6840
pISSN - 1614-6832
DOI - 10.1002/aenm.201801149
Subject(s) - anode , materials science , intercalation (chemistry) , electrochemistry , nanocages , chemical engineering , potassium ion battery , potassium , carbon fibers , energy storage , graphite , inorganic chemistry , lithium vanadium phosphate battery , composite material , electrode , chemistry , metallurgy , composite number , biochemistry , power (physics) , physics , quantum mechanics , engineering , catalysis
As an emerging electrochemical energy storage device, potassium‐ion batteries (PIBs) have drawn growing interest due to the resource‐abundance and low cost of potassium. Graphite‐based materials, as the most common anodes for commercial Li‐ion batteries, have a very low capacity when used an anode for Na‐ion batteries, but they show reasonable capacities as anodes for PIBs. The practical application of graphitic materials in PIBs suffers from poor cyclability, however, due to the large interlayer expansion/shrinkage caused by the intercalation/deintercalation of potassium ions. Here, a highly graphitic carbon nanocage (CNC) is reported as a PIBs anode, which exhibits excellent cyclability and superior depotassiation capacity of 175 mAh g −1 at 35 C. The potassium storage mechanism in CNC is revealed by cyclic voltammetry as due to redox reactions (intercalation/deintercalation) and double‐layer capacitance (surface adsorption/desorption). The present results give new insights into structural design for graphitic anode materials in PIBs and understanding the double‐layer capacitance effect in alkali metal ion batteries.