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Safety properties of liquid state soft pack high power batteries with carbon-coated LiFePO4/graphite electrodes

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Abstract

The carbon-coated LiFePO4 materials were synthesized, and their structure and morphology were characterized by X-ray diffraction and transmission electron microscopy. The safety and heating mechanism of the 066094-type liquid state soft pack high power batteries with carbon-coated LiFePO4/graphite electrodes under abusive conditions, such as overcharge, overdischarge, and short current were extensively investigated. It was found that the increase in the temperature of the LiFePO4/graphite high power batteries during overcharge was attributed to the reaction of the electrolyte decomposition and the Joule heat. The batteries were heated rapidly by the irreversible heat generated from the current passing through the electrodes during short current. The temperature rise of the batteries which were overdischarged to 0 V was mainly due to the Joule heat. The overdischarge at 1 C/0 V almost did not influence the cycling performance of the batteries. The batteries did not fire, smoke, and explode under the above-mentioned abusive conditions. Therefore, the 066094-type liquid state soft film pack high power batteries with carbon-coated LiFePO4/graphite electrodes showed excellent safety performance.

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Acknowledgement

This work was supported by the public bidding program of Guangdong and Hong Kong (special program of Dongguan: 200716841).

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Authors and Affiliations

  1. Department of Applied Chemistry, School of Chemical Engineering and Technology, Tianjin University, Tianjin, 300072, China

    Yan-Bing He, Guo-Wei Ling, Zhi-Yuan Tang, Quan-Sheng Song, Quan-Hong Yang, Wei Lv & Qiang Xu

  2. McNair Technology Co., Ltd, Dongguan, Guangdong, 523700, China

    Wu Chen & Yan-Jun Su

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  1. Yan-Bing He
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  2. Guo-Wei Ling
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Correspondence to Yan-Bing He.

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He, YB., Ling, GW., Tang, ZY. et al. Safety properties of liquid state soft pack high power batteries with carbon-coated LiFePO4/graphite electrodes. J Solid State Electrochem 14, 751–756 (2010). https://doi.org/10.1007/s10008-009-0849-7

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  • DOI: https://doi.org/10.1007/s10008-009-0849-7

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