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Detection of Micro-Scale Li Dendrite via H2 Gas Capture for Early Safety Warning
Joule ( IF 39.8 ) Pub Date : 2020-07-10 , DOI: 10.1016/j.joule.2020.05.016
Yang Jin , Zhikun Zheng , Donghui Wei , Xin Jiang , Hongfei Lu , Lei Sun , Fengbo Tao , Dongliang Guo , Yang Liu , Jinfeng Gao , Yi Cui

Li-ion battery safety issues related to fires and explosions are frequently triggered by Li dendrite growth, which is a predominant reason for separator piercing and cell shorts and is very difficult to detect in the early state. Here, we developed a sensitive detection method based on H2 gas capture that could detect trace amounts of Li dendrite formation. H2 gas was generated due to reaction of metallic Li with polymer binders. Even micron-scale Li dendrite (∼2.8 × 10−4 mg and 50 μm) growth can trigger H2 capture. Overcharge experiment with a LiFePO4-graphite battery pack (8.8 kWh) shows that H2 was captured first among H2, CO, CO2, HCL, HF, and SO2, and the capture time was 639 s earlier than smoke and 769 s earlier than fire. The Li dendrite growth can be completely prevented once H2 is captured, with neither smoke nor fire observed, which provides an effective method for early safety warning.



中文翻译:

通过H 2气捕集检测微型锂枝晶,以进行早期安全警告

与火灾和爆炸有关的锂离子电池安全问题经常由锂枝晶生长引发,这是隔膜刺穿和电池短路的主要原因,并且在早期状态下很难检测到。在这里,我们开发了一种基于H 2气体捕获的灵敏检测方法,可以检测痕量的锂枝晶形成。由于金属Li与聚合物粘合剂的反应,产生了H 2气体。即使是微米级的Li树枝状晶体(约2.8×10 -4 mg和50μm)的生长也会触发H 2的捕获。LiFePO 4石墨电池组(8.8 kWh)的过充电实验表明,H 2首先在H 2,CO,CO 2中被捕获,HCL,HF和SO 2,捕获时间比烟雾早639 s,比火早769 s。一旦捕获到H 2,就可以完全防止Li枝晶的生长,并且没有观察到烟雾或火苗,这为早期安全预警提供了有效的方法。

更新日期:2020-07-10
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