Synthesis and Characterization of Pitch-Coated Li2MnxFe1−xSiO4/C Composite Cathode Material for Lithium-Ion Batteries

In this study, two cathode materials were synthesized (Li2Mn0.5Fe0.5SiO4 and Li2Mn0.2Fe0.8SiO4). The intrinsic characteristics and electrochemical performance of these materials were investigated. These silicate cathode materials have several advantages such as high safety, low cost, low environment...

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Bibliographic Details
Published in:International journal of electrochemical science 2017-11, Vol.12 (11), p.10981-10993
Main Authors: Cheng, Ho-Ming, Dai, Hong-Gen, Wang, Fu-Ming, Tsai, Pi-Chuen, Liu, Wei-Ren
Format: Article
Language:English
Subjects:
graphitization
lithium ion battery
orthosilicate cathode
pitch
sol-gel method
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Summary:In this study, two cathode materials were synthesized (Li2Mn0.5Fe0.5SiO4 and Li2Mn0.2Fe0.8SiO4). The intrinsic characteristics and electrochemical performance of these materials were investigated. These silicate cathode materials have several advantages such as high safety, low cost, low environmental toxicity, and high theoretical energy density. However, they have some drawbacks that must be addressed, including low electronic conductivity and low ionic diffusivity, which limit their practical application in lithium-ion batteries. The Li2MnxFe1−xSiO4/C composite materials were prepared using the sol–gel method. The X-ray diffraction patterns of the synthesized Li2MnxFe1-xSiO4/C composite materials exhibited favorable crystallinity. Pitch was coated on the synthesized composite materials to improve their electronic conductivity. Raman spectroscopy confirmed the high graphitization of the carbon coatings. The discharge capacity of the pitch-coated Li2Mn0.2Fe0.8SiO4/C (Li2Mn0.2Fe0.8SiO4/C/pitch) cathode was 183 mAh g−1 delivered in the first cycle at a rate of 0.1 C. The battery cycle retention was 85% after 30 cycles, demonstrating an excellent cycle life compared with those reported in previous studies. These cathode materials have high potential for application in lithium-ion batteries.
ISSN:1452-3981
1452-3981
DOI:10.20964/2017.11.06