Next-Generation Lithium Metal Anode Engineering via Atomic Layer Deposition
Next-Generation Lithium Metal Anode Engineering via Atomic Layer Deposition
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DOI：
10.1021/acsnano.5b02166
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发表时间：
2015-06-01
期刊：
影响因子：
17.1
通讯作者：
Noked, Malachi
中科院分区：
文献类型：
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作者：
Kozen, Alexander C.;Lin, Chuan-Fu;Noked, Malachi
金属锂因其3840mAHg(-1)的高能量密度而被认为是最有前途的下一代电池负极。然而，锂表面的极端反应性会导致与溶剂的寄生反应、污染和电解液中的活性物质穿梭，从而降低使用锂金属阳极的电池的性能。解决这一问题的一个有希望的解决方案是在锂金属表面应用薄的化学保护层。利用自制的超高真空集成沉积和表征系统，我们演示了原子层沉积(ALD)在锂金属上直接沉积保护层的过程，并具有精确的厚度控制。作为概念验证，我们证明了14 nm厚的ALD Al_2O_3层可以保护锂表面免受大气、硫和电解液的腐蚀。使用锂-S电池作为测试系统，我们展示了使用ALD保护的阳极比使用裸Li金属阳极组装的电池在长达100次循环中的容量保持能力有所提高。
Lithium metal is considered to be the most promising anode for next-generation batteries due to its high energy density of 3840 mAh g(-1). However, the extreme reactivity of the Li surface can induce parasitic reactions with solvents, contamination, and shuttled active species in the electrolyte, reducing the performance of batteries employing Li metal anodes. One promising solution to this issue is application of thin chemical protection layers to the Li metal surface. Using a custom-made ultrahigh vacuum integrated deposition and characterization system, we demonstrate atomic layer deposition (ALD) of protection layers directly on Li metal with exquisite thickness control. We demonstrate as a proof-of-concept that a 14 nm thick ALD Al2O3 layer can protect the Li surface from corrosion due to atmosphere, sulfur, and electrolyte exposure. Using Li-S battery cells as a test system, we demonstrate an improved capacity retention using ALD-protected anodes over cells assembled with bare Li metal anodes for up to 100 cycles.