Anti-site reordering in LiFePO4: Defect annihilation on charge carrier injection
- Title
- Anti-site reordering in LiFePO4: Defect annihilation on charge carrier injection
- Authors
- 임희대; 박규영; 박인철; 김형섭; 홍지현; 김종순; 강기석
- 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
- https://pubs.kist.re.kr/handle/201004/67574
- ISSN
- 0897-4756
- Appears in Collections:
- KIST Publication > Article
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