Thermal safety diagram for lithium-ion battery using single-crystal and polycrystalline particles LiNi0.8Co0.1Mn0.1O2
Thermal safety diagram for lithium-ion battery using single-crystal and polycrystalline particles LiNi0.8Co0.1Mn0.1O2
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DOI：
10.1016/j.est.2020.101775
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发表时间：
2020-12-01
影响因子：
9.4
通讯作者：
Isogai, Yuji
中科院分区：
文献类型：
--
作者：
Chiba, Kazuki;Yoshizawa, Akihiro;Isogai, Yuji
锂离子电池的热失控不仅与正极材料的化学成分有关，而且与晶界有关。然而，尽管到目前为止关于正极材料热稳定性的研究很多，但很少有关于充满电池中热失控的安全图的报道。本研究以单晶和多晶颗粒LiNi0.8Co0.1Mn0.1O2(NCM 811)为正极材料，以天然石墨(NG)为负极材料，比较了单晶和多晶颗粒LiNi0.8Co0.1Mn0.1O2在全电池中的热安全图。用差示扫描量热仪(DSC)制作了热安全图，它使用了一个包含式电池，它由所有LiB组分组成。因为热失控反应是一系列的基本反应，所以它是用弗里德曼微分等转化率方法确定的。利用DSC数据得到的热失控预报结果用加速量热计(ARC)进行了验证。预测结果与ARC测量的验证结果基本吻合，说明以单晶颗粒NCM 811为正极材料的电池比以多晶颗粒NCM 811为正极材料的电池具有更高的热安全性。
Thermal runaway of lithium-ion battery (LIB) depends not only on the chemical composition of cathode materials but also on grain boundary. However, despite many studies on thermal stability of cathode materials to date, few safety diagrams of thermal runaway in full cells have been reported. In this study, the thermal safety diagram is compared in the full cell by using single-crystal and polycrystalline particles LiNi0.8Co0.1Mn0.1O2 (NCM 811) as cathode material and natural graphite (NG) as anode material. A thermal safety diagram is made using a differential scanning calorimetry (DSC) by using an all-inclusive cell, which consists of all LIB components. Since a thermal runaway reaction is a series of elementary reactions, it is determined using the Friedman differential isoconversional method. Thermal runaway prediction results obtained using DSC data are verified using an acceleration rate calorimeter (ARC). The prediction results nearly match the verification results of ARC measurements, and it is clarified that the full cell using single-crystal particles NCM 811 as the cathode material has higher thermal safety than that using polycrystalline particles NCM 811.