Advances in New and Renewable Energy >
Investigation on Graphite/LiFePO4 Batteries Fabircated by Carbon-Coated Aluminum Foil Current Collector
Received date: 2017-02-17
Revised date: 2017-04-15
Online published: 2017-04-28
The electrochemical performances of pouch type 9 Ah lithium iron phosphate/graphite (C/LiFePO4) batteries fabricated with conventional aluminum foil (AF) and carbon coated aluminum foil (CCAF) cathode current collector were studied and compared. Results show that the CCAF current collector could increase the interaction area of active materials with current collector, which improves the overall electrical conductivity and reduces battery resistance and polarization. The electrochemical performance of the batteries fabricated by CCAF is superior to that of AF, and results show as follows: the alter-nating current resistance (ACR) reduced by 7.30 mΩ, the direct current resistance decreased by 9 ~ 12 mΩ under the same state of charge (SOC) condition, the plateau voltage increased by 40 mV and the instant voltage relaxation rate (dV/dt) decreased by 0.94 V/h, the capacity retention increased by 2.4% under 1 C at −20oC, ratio of 5 C discharge capacity to 1 C discharge capacity enhanced by 10.6%, the discharge temperature decreased by 15.2oC at 5 C high-rate, and the capacity retention after 500 circles at 5 C increased by 7.06%.
CHEN Peng , REN Ning , JI Xue-min , CHANG Lin-rong , DENG Ji-yang , SU Feng , LI Hong-tao . Investigation on Graphite/LiFePO4 Batteries Fabircated by Carbon-Coated Aluminum Foil Current Collector[J]. Advances in New and Renewable Energy, 2017 , 5(2) : 157 -162 . DOI: 10.3969/j.issn.2095-560X.2017.02.013
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