Optimization of Inactive Material Content in Lithium Iron Phosphate Electrodes for High Power Applications

被引：17
作者：
Ha, Seonbaek [1 ]
Ramani, Vijay K. [1 ]
Lu, Wenquan [2 ]
Prakash, Jai [1 ]
机构：
[1] IIT, Ctr Electrochem Sci & Engn, Dept Chem & Biol Engn, 10 West 33rd St, Chicago, IL 60616 USA
[2] Argonne Natl Lab, Electrochem Energy Storage, Dept Chem Sci & Engn, 9700 South Cass Ave,Bldg 200, Argonne, IL 60439 USA
来源：
ELECTROCHIMICA ACTA | 2016年 / 191卷
关键词：
LiFePO4; electrode optimization; four-point probe conductivity; area specific impedance; lithium ion batteries; POSITIVE-ELECTRODE; POLYMERIC BINDER; LIFEPO4; PERFORMANCE; CARBON; CATHODE; ADDITIVES; OLIVINES; CELLS;
D O I：
10.1016/j.electacta.2016.01.049
中图分类号：
O646 [电化学、电解、磁化学];
学科分类号：
081704 ;
摘要：
The electrochemical performance of lithium iron phosphate (LiFePO4) electrodes has been studied to find the optimum content of inactive materials (carbon black + polyvinylidene difluoride [PVDF] polymer binder) and to better understand electrode performance with variation in electrode composition. Trade-offs between inactive material content and electrochemical performance have been characterized in terms of electrical resistance, rate-capability, area-specific impedance (ASI), pulse-power characterization, and energy density calculations. The ASI and electrical conductivity were found to correlate well with ohmic polarization. The results showed that a 80:10:10 (active material: binder: carbon agents) electrode had a higher pulse-power density and energy density at rates above 1C as compared to 90:5:5, 86:7:7 and 70:15:15 formulations, while the 70:15:15 electrode had the highest electrical conductivity of 0.79 S cm(-1). A CB/PVDF ratio of ca. 1.22 was found to be the optimum formulation of inactive material when the LiFePO4 composition was 80 wt%. (C) 2016 Elsevier Ltd. All rights reserved.
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页码：173 / 182
页数：10
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