Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 8, Issue 24, Pages 15225-15231Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.6b02567
Keywords
graphitic carbon; low temperature; high rate; electronic conductivity; lithium iron phosphate
Funding
- Natural Science Foundation of the State Key Laboratory of China
- China Scholarship Council [201508130079]
- Postgraduate Innovation Project of Hebei Province [00302-6370013]
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Low lithium ion diffusivity and poor electronic conductivity are two major drawbacks for the wide application of LiFePO4 in high-power lithium ion batteries. In this work, we report a facile and efficient carbon-coating method to prepare LiFePO4/graphitic carbon composites by in situ carbonization of perylene-3,4,9,10-tetracarboxylic dianhydride during calcination. Perylene-3,4,9,10-tetracarboxylic dianhydride containing naphthalene rings can be easily converted to highly graphitic carbon during thermal treatment. The ultrathin layer of highly graphitic carbon coating drastically increased the electronic conductivity of LiFePO4. The short pathway along the [010] direction of LiFePO4 nanoplates could decrease the Li+ ion diffusion path. In favor of the high electronic conductivity and short lithium ion diffusion distance, the LiFePO4/graphitic carbon composites exhibit an excellent cycling stability at high current rates at room temperature and superior performance at low temperature (-20 degrees C).
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