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Two forms of LiFePO 4 material were evaluated in lithium cells. One type of LiFePO 4 (P-I) that has a particle size ranging from 1-5 µm is compared to LiFePO 4 (P-II) consisting of nano-particles. Coated electrodes on Al-carbon with thickness varying from 18 to 25 µm were used in this study. The addition of VGCF carbon fiber greatly improved the rate capability at low temperature. This suggests a good conductivity networking and wettability in the cathode. LiFePO 4 (P-II) has improved the low-and high-rate discharge capacity. When VGCF fibers were combined with LiFePO 4 (P-II) in the same composite cathode, the high rate capacity at 12C was increased by 51% compared to LiFePO 4 (P-I) cathode with carbon black. At -10°C and at 2C rate, 90 mAh/g was delivered from the cell. Cycling at 60°C occurred with negligible capacity fade after 400 cycles. Furthermore, the cell was capable of good performance at high rate with 120 mAh/g at 10C, and it still has a good reserve at 25C with 73mAh/g.

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A new water soluble elastomer was evaluated as a binder with LiFePO4 -VGCF cathode material in Li-ion batteries and different carbon origin anodes. The electrochemical characteristics of this cathode and anodes were compared to that with PvdF-based cathode binder. The elastomer-based cathode and anodes show high flexibility with good adhesion. The electrochemical performance was also evaluated and compared to PvdF-based cathodes at 25å and 60{degree sign}C. A lower irreversible capacity loss was obtained with the elastomer- based cathode and graphite-based anode , The Li-ion gel electrolyte developed by Hydro-Québec shows high stable cycle life but lower power density at rates less than 5C compared to liquid electrolytes

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