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Stretchable separator/current collector composite for superior battery safety
Energy & Environmental Science ( IF 32.4 ) Pub Date : 2022-10-28 , DOI: 10.1039/d2ee01793h Zhikang Liu 1 , Yanhao Dong 2 , Xiaoqun Qi 3 , Ru Wang 1, 4, 5 , Zhenglu Zhu 1 , Chao Yan 4, 5 , Xinpeng Jiao 5 , Sipei Li 2 , Long Qie 3 , Ju Li 2, 6 , Yunhui Huang 3
Energy & Environmental Science ( IF 32.4 ) Pub Date : 2022-10-28 , DOI: 10.1039/d2ee01793h Zhikang Liu 1 , Yanhao Dong 2 , Xiaoqun Qi 3 , Ru Wang 1, 4, 5 , Zhenglu Zhu 1 , Chao Yan 4, 5 , Xinpeng Jiao 5 , Sipei Li 2 , Long Qie 3 , Ju Li 2, 6 , Yunhui Huang 3
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Safety is the most concerning issue for high-energy-density batteries. Here we show how mechanical abuse-induced short-circuiting can be mitigated by designing a structure of highly deformable separator/current collector (SCC) composite that wraps around broken edges and electronically insulates them upon penetration. We report progress in roll-to-roll processed metalized plastic SCC, where 750 nm thick nanocrystalline aluminum deposited on 6 μm polyethylene terephthalate (PET) substrate is used to replace 14 μm Al foil as the current collector (CC) in rechargeable lithium-ion batteries (LIBs). The Al–PET SCC nanocomposite not only increases the cell-level energy density by lowering CC's thickness and weight, but also dramatically increases the battery safety in harsh mechanical penetration accidents. The improved safety is due to better mechanical ductility of PET than Al and cathode, such that in penetration, the insulating PET can extend and isolate around the broken edges and the cathode can be automatically delaminated and insulated from the external circuit, thus preventing short-circuiting induced thermal runaway.
中文翻译：
可拉伸的隔膜/集流体复合材料，具有出色的电池安全性
安全性是高能量密度电池最关心的问题。在这里，我们展示了如何通过设计一种高度可变形的隔膜/集电器 (SCC) 复合材料的结构来减轻机械滥用引起的短路，该复合材料包裹着破损的边缘并在穿透时对其进行电子绝缘。我们报告了卷对卷加工金属化塑料 SCC 的进展，其中 750 nm 厚的纳米晶铝沉积在 6 μm 聚对苯二甲酸乙二醇酯 (PET) 基板上，用于代替 14 μm 铝箔作为可充电锂离子电池中的集电器 (CC)电池（LIB）。Al-PET SCC 纳米复合材料不仅通过降低 CC 的厚度和重量来提高电池级能量密度，而且在严酷的机械穿透事故中也显着提高了电池的安全性。
更新日期：2022-10-28
中文翻译：
可拉伸的隔膜/集流体复合材料，具有出色的电池安全性
安全性是高能量密度电池最关心的问题。在这里，我们展示了如何通过设计一种高度可变形的隔膜/集电器 (SCC) 复合材料的结构来减轻机械滥用引起的短路，该复合材料包裹着破损的边缘并在穿透时对其进行电子绝缘。我们报告了卷对卷加工金属化塑料 SCC 的进展，其中 750 nm 厚的纳米晶铝沉积在 6 μm 聚对苯二甲酸乙二醇酯 (PET) 基板上，用于代替 14 μm 铝箔作为可充电锂离子电池中的集电器 (CC)电池（LIB）。Al-PET SCC 纳米复合材料不仅通过降低 CC 的厚度和重量来提高电池级能量密度，而且在严酷的机械穿透事故中也显着提高了电池的安全性。
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