期刊
JOURNAL OF SOLID STATE ELECTROCHEMISTRY
卷 12, 期 7-8, 页码 995-1001出版社
SPRINGER
DOI: 10.1007/s10008-007-0419-9
关键词
LiFePO4; carbon; lithium ion batteries; graphitization catalysts
The electrochemical performance of LiFePO4/C composites in lithium cells is closely correlated to pressed pellet conductivities measured by AC impedance methods. These composite conductivities are a strong function not only of the amount of carbon but of its structure and distribution. Ideally, the amount of carbon in composites should be minimal (less than about 2 wt%) so as not to decrease the energy density unduly. This is particularly important for plug-in hybrid electric vehicle applications (PHEVs) where both high power and moderate energy density are required. Optimization of the carbon structure, particularly the sp(2)/sp(3) and disordered/graphene (D/G) ratios, improves the electronic conductivity while minimizing the carbon amount. Manipulation of the carbon structure can be achieved via the use of synthetic additives including iron-containing graphitization catalysts. Additionally, combustion synthesis techniques allow co-synthesis of LiFePO4 and carbon fibers or nanotubes, which can act as nanowires for the conduction of current during cell operation.
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