期刊
RSC ADVANCES
卷 7, 期 70, 页码 44296-44302出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c7ra08062j
关键词
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资金
- National Natural Science Foundation of China [21503036]
- Sichuan Science and Technology Support Program [2015GZ0130, 2016000156]
- Fundamental Research Funds for the Central Universities [ZYGX2015KYQD030]
The applications of LiFePO4 (LFP) in high-power lithium ion batteries (LIBs) are limited due to its two major drawbacks: poor electronic conductivity and low lithium ion diffusivity, which could be greatly improved chiefly by reducing the size of LFP crystallites to nanoscale and introducing a conductive carbon-coating layer. In this study, asphalt-derived and glucose-derived carbon proved to be soft carbon-coating (SCC) and hard carbon-coating (HCC), respectively. Asphalt and glucose were therefore used as carbon precursors to prepare varied carbon-coated LFP nanoparticles. The electrochemical properties of the LFP/carbon composites were studied using cyclic voltammetry, electrochemical impedance spectroscopy and charge/discharge cycling. The effects of variation of carbon coatings on the electrochemical performance of LiFePO4 cathodes was investigated in detail, and it was found that LFP/SCC showed a superior performance in capacity and rate capability than that of LFP/HCC. It was therefore concluded that soft carbon coating on LFP exhibits better electrochemical performance than hard carbon coating, demonstrating that asphalt could be used as a cheap and efficient carbon source material of LiFePO4 cathodes for LIBs.
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