Building thermally stable Li-ion batteries using a temperature-responsive cathode
Building thermally stable Li-ion batteries using a temperature-responsive cathode
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使用温度响应型阴极构建热稳定的锂离子电池
DOI：
10.1039/c6ta03407a
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发表时间：
2016-01-01
影响因子：
11.9
通讯作者：
Ai, Xinping
中科院分区：
文献类型：
--
作者：
Ji, Weixiao;Wang, Feng;Ai, Xinping
锂离子电池现在已经被用作电动汽车的电源;然而，它们的安全性仍然是一个严重的问题，因为随着电动汽车在运输市场上的快速增长，报告的事故也在增加。为了解决这一问题，我们在本文中描述了一种新型的温度响应阴极，其通过在Al基底和阴极活性LiCoO 2层之间涂覆厚度小于1 μm的超薄聚（3-辛基噻吩）（P3 OT）层来形成夹层Al/P3 OT/LiCoO 2阴极（LCO-PTC）。这种LCO-PTC阴极在环境温度下表现出与常规LiCoO 2阴极几乎相同的电化学性能，但在90-100 °C的高温范围内具有强PTC行为以关闭电池反应，从而保护电池免受热失控。由于其易于制造，成本效益和特别好的兼容性与当前的电池技术，这种新型的PTC电极可以方便地扩展到其他锂插入阴极构建更安全的锂离子电池。
Lithium ion batteries have now been used as a power source for electric vehicles; however, their safety still remains a serious concern as the accidents reported increase with the rapid increase of electric vehicles in transportation markets. To address this issue, we describe herein a novel temperature-responsive cathode by coating an ultra-thin layer of poly(3-octylthiophene) (P3OT) with a thickness less than 1 μm in between the Al substrate and cathode-active LiCoO2 layer to form a sandwiched Al/P3OT/LiCoO2 cathode (LCO-PTC). This LCO-PTC cathode demonstrates almost the same electrochemical performance as the conventional LiCoO2 cathode at ambient temperature but a strong PTC behavior to switch off the cell reaction in a high temperature range of 90–100 °C, thus protecting the cell from thermal runaway. Because of its easy fabrication, cost effectiveness and particularly good compatibility with the current battery technology, this new type of PTC electrode can be conveniently extended to other Li-insertion cathodes for building safer Li-ion batteries.