Anti-site reordering in LiFePO4: Defect annihilation on charge carrier injection

Title
Anti-site reordering in LiFePO4: Defect annihilation on charge carrier injection
Authors
임희대박규영박인철김형섭홍지현김종순강기석
Issue Date
2014-09
Publisher
Chemistry of materials
Citation
VOL 26, NO 18-5351
Abstract
Defects critically affect the properties of materials. Thus, controlling the defect concentration often plays a pivotal role in determining performance. In lithium rechargeable batteries, the operating mechanism is based on ion transport, so large numbers of defects in the electrode crystal can significantly impede Li ion diffusion, leading to decreased electrochemical properties. Here, we introduce a new way to heal defects in crystals by a room-temperature electrochemical annealing process. We show that defects in olivine LiFePO4, an important cathode material, are significantly reduced by the electrochemical recombination of Li/Fe anti-sites. The healed LiFePO4 recovers its high-power capabilities. The types of defects in LiFePO4 and recombination mechanisms are discussed with the aid of first-principles calculations.
URI
http://pubs.kist.re.kr/handle/201004/67574
ISSN
0897-4756
Appears in Collections:
KIST Publication > Article
Files in This Item:
There are no files associated with this item.
Export
RIS (EndNote)
XLS (Excel)
XML


qrcode

Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.

BROWSE