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13th ABC, September 1-4, 2009, Macau Room-temperature ionic liquids as electrolyte additives for gel lead – acid batteries He-Ping LIU 1, Hong-Yu CHEN.

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Presentation on theme: "13th ABC, September 1-4, 2009, Macau Room-temperature ionic liquids as electrolyte additives for gel lead – acid batteries He-Ping LIU 1, Hong-Yu CHEN."— Presentation transcript:

1 13th ABC, September 1-4, 2009, Macau Room-temperature ionic liquids as electrolyte additives for gel lead – acid batteries He-Ping LIU 1, Hong-Yu CHEN 1, An-Fu Ren 2, He LI *1,2,3, Jian-Ming Wang 3 1. School of Chemistry and Environment, South China Normal University, Guangzhou, China 2. Zhejiang Tianneng Battery Co., Ltd. Huzhou, China 3. College of Science, Zhejiang University, Hangzhou, China

2 13th ABC, September 1-4, 2009, Macau Outline Introduction Experimental Results and discussion Summary and conclusions

3 13th ABC, September 1-4, 2009, Macau Introduction ExperimentalResults Extremely low volatility High polarity Excellent electrical conductivity Environment friendly Ionic Liquid (IL) Conclusions

4 13th ABC, September 1-4, 2009, Macau Problem Large internal resistance Poor deep charge-discharge cycling performance Small capacity Thermal runaway Introduction ExperimentalResults Motivation Conclusions

5 13th ABC, September 1-4, 2009, Macau To lower internal resistance To improve deep charge-discharge cycling performance To improve capacity of battery To prevent thermal runaway Introduction ExperimentalResults Goals Conclusions

6 13th ABC, September 1-4, 2009, Macau Introduction Experimental Results Preparation of colloidalPreparation of electrode AcidILSiO 2 Pb alloy EC Test microstructure determination (LSV, DPV, CV, etc) (SEM, STM, ICP-AES, etc) Conclusions

7 13th ABC, September 1-4, 2009, Macau In this study, room-temperature ionic liquids (RTIL) were used as electrolyte additives to using in lead–acid batteries. The electrochemical properties of gelled electrolytes were investigated by means of cyclic voltammetry. Three factors (the dose of RTIL 、 the concentration of nano fumed silica 、 the species of RTIL) and three levels are planned in the experiment by means of orthogonal design L 9 (3 4 ). Introduction Experimental ResultsConclusions

8 13th ABC, September 1-4, 2009, Macau Introduction Experimental Results Level Factor A (species of RTIL) B (concentration of nano fumed silica) % C (dose of RTIL) mL 1BMIMHSO BMIMBF BMIMPF 6 84 Experimental Design Table 1 Orthogonal Design Conclusions

9 13th ABC, September 1-4, 2009, Macau Table 2 Orthogonal experiment table and experiment results No.AB--C Anodic peak 1 current ( A ) Anodic peak 1 potential ( V ) cathode peak 1 current ( A ) cathode peak 1 potential ( V ) cathode peak 2 current ( A ) cathode peak 2 potential ( V ) cathode peak 3 current ( A ) cathode peak 3 potential ( V ) e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e Introduction Experimental Results The results show that the various factors have different effects on the gel battery, such as the dose of ionic liquids> the concentration of nano fumed silica > the species of ionic liquids. Optimized condition : C3B1A1 Conclusions

10 13th ABC, September 1-4, 2009, Macau IntroductionExperimental Results Fig 1 Cyclic voltammograms with and without ionic liquid additive The current peak A1, corresponding to the formation of lead sulfate,three current peaks appeared, corresponding to the transitions of PbO2 to PbSO4 (C3) and PbSO4 to Pb (C1, C2). The cathodic peak current of C1 and C2 increased obviously, but C3 decreased which we should study further more. Conclusions

11 13th ABC, September 1-4, 2009, Macau IntroductionExperimental Results Figure 2 Cyclic voltammograms of different doses with BMIMHSO 4 ionic liquid additive the more we add the amount of BMIMHSO 4, the more anodic and cathodic peak current increase. Meanwhile the hydrogen and oxygen evolution current reduced obviously. Conclusions

12 13th ABC, September 1-4, 2009, Macau IntroductionExperimental Results Conclusions Figure 3 Cyclic voltammograms (under the optimized condition) The optimum test condition is to add 4mL BMIMHSO4 into 4% fumed silica.

13 13th ABC, September 1-4, 2009, Macau The experimental results show that the various factors have different effects in the gel battery, such as the dose of ionic liquids> the concentration of nano fumed silica > the species of ionic liquids. The optimum test condition is to add 4mL BMIMHSO 4 into 4% fumed silica. RTIL can decrease the resistance, which is benefit for the gel lead– acid batteries Each factor need to be studied in more detail, and corrosion test of grid should be investigated in ionic liquid gelled electrolyte. IntroductionExperimentalResults Conclusions

14 13th ABC, September 1-4, 2009, Macau Thank you for your attention!


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