Hard–Soft Composite Carbon as a Long‐Cycling and High‐Rate Anode for Potassium‐Ion Batteries

There exist tremendous needs for sustainable storage solutions for intermittent renewable energy sources, such as solar and wind energy. Thus, systems based on Earth‐abundant elements deserve much attention. Potassium‐ion batteries represent a promising candidate because of the abundance of potassiu...

Full description

Saved in:
Bibliographic Details
Published in:Advanced functional materials 2017-07, Vol.27 (26), p.n/a
Main Authors: Jian, Zelang, Hwang, Sooyeon, Li, Zhifei, Hernandez, Alexandre S., Wang, Xingfeng, Xing, Zhenyu, Su, Dong, Ji, Xiulei
Format: Article
Language:English
Subjects:
Abundance
Anodes
Battery cycles
Carbon
Carbon anode
Carboxymethyl cellulose
composite carbon
ENERGY PLANNING, POLICY, AND ECONOMY
ENERGY STORAGE
Graphite
Hard carbon
Ion storage
Materials science
Microspheres
Non-graphitic
nongraphitic carbon
Potassium
Potassium-ion batteries
Renewable energy sources
Sodium
Sodium carboxymethyl cellulose
Soft carbon
Storage batteries
Sustainability
Wind power
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:There exist tremendous needs for sustainable storage solutions for intermittent renewable energy sources, such as solar and wind energy. Thus, systems based on Earth‐abundant elements deserve much attention. Potassium‐ion batteries represent a promising candidate because of the abundance of potassium resources. As for the choices of anodes, graphite exhibits encouraging potassium‐ion storage properties; however, it suffers limited rate capability and poor cycling stability. Here, nongraphitic carbons as K‐ion anodes with sodium carboxymethyl cellulose as the binder are systematically investigated. Compared to hard carbon and soft carbon, a hard–soft composite carbon with 20 wt% soft carbon distributed in the matrix phase of hard carbon microspheres exhibits highly amenable performance: high capacity, high rate capability, and very stable long‐term cycling. In contrast, pure hard carbon suffers limited rate capability, while the capacity of pure soft carbon fades more rapidly. The hard–soft composite carbon represents a highly promising anode material for practical applications of potassium‐ion batteries. It exhibits a high reversible capacity of 261 mAh g−1, excellent rate capability, and stable cycling life of 200 cycles with capacity retention of 93%.
ISSN:1616-301X
1616-3028
DOI:10.1002/adfm.201700324