4.7 Article

Electrochemical performance of LiFePO4 @C composites with biomorphic porous carbon loading and nano-core-shell structure

Journal

CERAMICS INTERNATIONAL
Volume 40, Issue 8, Pages 13009-13017

Publisher

ELSEVIER SCI LTD
DOI: 10.1016/j.ceramint.2014.04.164

Keywords

Double electrical conductive network; Electrochemical properties; LiFePO4 @C/C composites; Nanostructures; Synergy effect

Funding

  1. (Hunan University China)
  2. Science and Technology Planning Project of Hunan Province, China [2012WK3023]
  3. Science and Technology Planning Project of Changsha City, Hunan Province, China [K1109117-11]

Ask authors/readers for more resources

Effect of biomorphic porous carbon (BPC) addition on the composition, microstructure, and electrochemical performance of LiFePO4 @C/C composites was investigated. Results indicated that network pores of BPC were almost completely filled by LiFePO4 @C nanoparticles, which were formed by an olivine structure LiFePO4 core with size that ranged from 58.6 nm to 80.1 nm and an amorphous carbon shell with a thickness of approximately 2 nm. Double electrical conductive networks formed in the composites improved the electrical properties of samples from 2.59 x 10(-6) S cm(-1) (sample A-0) to 5.76 x 10(-2) S cm(-1) (sample A-20). Synergy effect of electric double layer energy storage produced by BPC and lithium-ion extraction/insertion energy storage by LiFePO4 clearly reduced the capacity reduction rate of composites, and obtained a charge/discharge capacity of 114.2/110.5 mA h g(-1) (sample A-5) at 10 C. Moreover, addition of BPC showed a significant advantage in reducing the interfacial resistance of the electrode reaction in composites from 86.72 Omega (sample A-0) to 37.58 Omega (sample A-20). The electrical conductive mechanism of LiFePO4@C/C composites is discussed. (C) 2014 Elsevier Ltd and Techna Group S.r.l. All rights reserved.

Authors

I am an author on this paper
Click your name to claim this paper and add it to your profile.

Reviews

Primary Rating

4.7
Not enough ratings

Secondary Ratings

Novelty
-
Significance
-
Scientific rigor
-
Rate this paper

Recommended

No Data Available
No Data Available