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These batteries can handle the cold

By Paul Grad |

Lithium-ion batteries based on intercalation compound electrodes exhibit poor performance at temperatures below 0°C. Insufficient ionic conductivity and freezing of the electrolyte are generally seen as the main reasons for the poor performance of rechargeable batteries at low temperatures. Although several attempts have been made to solve this problem, those attempts involved additional materials that added extra weight, which is detrimental for portable devices. Now a team from Fudan University (Shanghai, China; www.fudan.edu.cn) has developed an ethyl acetate-based electrolyte that exhibits sufficient ionic conductivity at –70°C. Ethyl acetate was a promising choice due to its low freezing point of –84°C, but the low-temperature performance of ethyl acetate electrolyte had never been investigated previously. For the electrodes, the team used two organic polymers: a polytriphenylamine (PTPAn) cathode; and a 1,4,5,8-naphthalenetetracarboxylic dianhydride (NTCDA)-derived polymide (PNTCDA) anode. Unlike the electrodes used in Li-ion batteries, these organic compounds do not rely on intercalation — the process of integrating ions into the electrodes’ molecular matrix. The team noted that their battery offers several other…
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