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Kim, Jae-Kwang
YK Research
Research Interests
  • Organic rechargeable batteries
  • Advanced Functional Materials
  • Polymer electrolyte, Lonic liquid, Sodium Batteries
  • New Energy Conversion and Storage

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Improving electrochemical properties of porous iron substituted lithium manganese phosphate in additive addition electrolyte

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Title
Improving electrochemical properties of porous iron substituted lithium manganese phosphate in additive addition electrolyte
Author
Kim, Jae-KwangVijaya, RaniZhu, LikunKim, Youngsik
Issue Date
2015-02
Publisher
ELSEVIER SCIENCE BV
Citation
JOURNAL OF POWER SOURCES, v.275, pp.106 - 110
Abstract
Porous LiMn0.6Fe0.4PO4 (LMFP) is synthesized by a modified sol-gel process. Highly conductive LMFP due to uniform dispersion of carbon throughout LMFP particles are achieved by the addition of sucrose as an additional carbon source. The LMFP obtained has a high specific surface area with a uniform, porous, and web-like nano-sized carbon layer on the surface. The initial discharge capacity and energy density of the LMFP cathode is 152 mAh g-1 and 570 Wh kg-1, respectively, at 0.1C current rate. The combined effect of high porosity and high electrical conductivity lead to fast lithium ion diffusion and enhance initial capacity compared to materials prepared by the general sol-gel method. However, with conventional electrolyte (1M LiPF6 in EC/DMC) poor cycle performance is observed due to HF attack. To improve the cycle stability we add tris (trimethylsily) phosphite (TMSP) as an additive in the electrolyte which dramatically improves cycle stability and rate-capability.
URI
https://scholarworks.unist.ac.kr/handle/201301/9308
URL
https://www.sciencedirect.com/science/article/pii/S0378775314018540?via%3Dihub
DOI
10.1016/j.jpowsour.2014.11.028
ISSN
0378-7753
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