Short‐Range Order in Mesoporous Carbon Boosts Potassium‐Ion Battery Performance

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 th...

Full description

Saved in:
Bibliographic Details
Published in:Advanced energy materials 2018-02, Vol.8 (5), p.n/a
Main Authors: Wang, Wei, Zhou, Jinhui, Wang, Zhuopeng, Zhao, Liyun, Li, Peihao, Yang, Yong, Yang, Chao, Huang, Hanxin, Guo, Shaojun
Format: Article
Language:English
Subjects:
Amorphous materials
amorphous mesoporous carbon
Anodes
Batteries
Carbon
Crystallization
Deformation
Electrode materials
Flux density
Graphite
Interlayers
large interlayer spacing
Potassium
potassium‐ion batteries
Short range order
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary: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. A high rate and long life potassium‐ion battery is achieved by using an amorphous ordered mesoporous carbon with a large interlayer spacing, which can have enough room to accomodate more potassium ions and achieve the smaller strain during the charge/discharege process for high stability.
ISSN:1614-6832
1614-6840
DOI:10.1002/aenm.201701648