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Battery materials for ultrafast charging and discharging SCIE SCOPUS

Title
Battery materials for ultrafast charging and discharging
Authors
Kang, BCeder, G
Date Issued
2009-03-12
Publisher
Nature Publish Group
Abstract
The storage of electrical energy at high charge and discharge rate is an important technology in today's society, and can enable hybrid and plug-in hybrid electric vehicles and provide back-up for wind and solar energy. It is typically believed that in electrochemical systems very high power rates can only be achieved with supercapacitors, which trade high power for low energy density as they only store energy by surface adsorption reactions of charged species on an electrode material(1-3). Here we show that batteries(4,5) which obtain high energy density by storing charge in the bulk of a material can also achieve ultrahigh discharge rates, comparable to those of supercapacitors. We realize this in LiFePO4 (ref. 6), a material with high lithium bulk mobility(7,8), by creating a fast ion-conducting surface phase through controlled off-stoichiometry. A rate capability equivalent to full battery discharge in 10-20 s can be achieved.
Keywords
RECHARGEABLE LITHIUM BATTERIES; PHOSPHATE-GLASSES; PHOTOELECTRON-SPECTROSCOPY; ELECTROCHEMICAL PROPERTIES; NANOSTRUCTURED MATERIALS; ACTIVE MATERIALS; ENERGY-STORAGE; ION BATTERIES; LIFEPO4; TRANSPORT
URI
https://oasis.postech.ac.kr/handle/2014.oak/17031
DOI
10.1038/NATURE07853
ISSN
0028-0836
Article Type
Article
Citation
NATURE, vol. 458, no. 7235, page. 190 - 193, 2009-03-12
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강병우KANG, BYOUNG WOO
Dept of Materials Science & Enginrg
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