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Anti-Site Reordering in LiFePO4: Defect Annihilation on Charge Carrier Injection

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Title
Anti-Site Reordering in LiFePO4: Defect Annihilation on Charge Carrier Injection
Author(s)
Park, KY; Inchul Park; Kim, H; Lim, HD; Hong, J; Kim, J; Kisuk Kang
Publication Date
2014-09
Journal
CHEMISTRY OF MATERIALS, v.26, no.18, pp.5345 - 5351
Publisher
AMER CHEMICAL SOC
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
https://pr.ibs.re.kr/handle/8788114/905
ISSN
0897-4756
Appears in Collections:
Center for Nanoparticle Research(나노입자 연구단) > Journal Papers (저널논문)
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