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Short‐Range Order in Mesoporous Carbon Boosts Potassium‐Ion Battery Performance
Author(s) -
Wang Wei,
Zhou Jinhui,
Wang Zhuopeng,
Zhao Liyun,
Li Peihao,
Yang Yong,
Yang Chao,
Huang Hanxin,
Guo Shaojun
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.201701648
Subject(s) - materials science , anode , carbon fibers , potassium ion battery , intercalation (chemistry) , ion , graphite , battery (electricity) , amorphous solid , amorphous carbon , mesoporous material , potassium , chemical engineering , range (aeronautics) , electrode , nanotechnology , chemical physics , composite material , inorganic chemistry , crystallography , catalysis , metallurgy , composite number , chemistry , organic chemistry , thermodynamics , lithium vanadium phosphate battery , power (physics) , physics , engineering
Abstract The adequate potassium resource on the earth has driven the researchers to explore new‐concept potassium‐ion batteries (KIBs) with high energy density. Graphite is a common anode for KIBs; however, the main challenge faced by KIBs is that K ions have the larger size than Li and Na ions, hindering the intercalation of K ions into electrodes and thus leading to poor rate performance, low capacity, and cycle stability during the potassiation and depotassiation process. Herein, an amorphous ordered mesoporous carbon (OMC) is reported as a new anode material for high‐performance KIBs. Unlike the well‐crystallized graphite, in which the K ions are squeezed into the restricted interlayer spacing, it is found that the amorphous OMC possesses larger interlayer spacing in short range and fewer carbon atoms in one carbon‐layers cluster, making it more flexible to the deformation of carbon layers. The larger interlayer spacing and the unique layered structure in short range can intercalate more K ions into the carbon layer, accommodate the increase of the interlayer spacing, and tolerate the volume expansion, resulting in a battery behavior with high capacity, high rate capability, and long cycle life.