Upgrading Carbonate Electrolytes for Ultra‐stable Practical Lithium Metal Batteries
Upgrading Carbonate Electrolytes for Ultra‐stable Practical Lithium Metal Batteries
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升级碳酸盐电解质以实现超稳定的实用锂金属电池
DOI：
10.1002/anie.202116214
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发表时间：
2022
期刊：
影响因子：
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通讯作者：
Archer, Lynden A.
中科院分区：
文献类型：
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作者：
Zhao, Qing;Utomo, Nyalaliska W.;Kocen, Andrew L.;Jin, Shuo;Deng, Yue;Zhu, Vivian Xiaojing;Moganty, Surya;Coates, Geoffrey W.;Archer, Lynden A.
LiNO3是一种广泛使用的盐添加剂，可显著提高锂金属阳极处醚基电解质的稳定性，但通常被认为与碳酸烷基酯不相容。在这里，我们发现与常识相反，碳酸乙烯酯等环状碳酸酯溶剂在没有任何添加剂的情况下可以溶解高达0.7 M的LiNO3，从而在很大程度上提高了阳极可逆性。 我们通过用LiNO3升级各种最先进的碳酸盐电解质来证明我们的发现的重要性，这为由薄锂（50 μm）阳极和高压阴极组成的电池提供了很大的改进。 对于LiNi0.6Mn0.2Co0.2O2（2 mAh cm−2，0.5 C）和LiNi0.8Mn0.1Co0.1O2阴极（4 mAh cm − 2，0.2 C），600次循环后的容量保持率分别为90.5%和92.5%。 1 Ah袋式电池（1000 Wh kg−1）在0.5 C下循环100次后保持率超过87.9%。 这项工作表明，改造传统的碳酸盐电解质为实际的LMB提供了一种可扩展的，具有成本效益的方法。
LiNO3is a widely used salt‐additive that markedly improves the stability of ether‐based electrolytes at a Li metal anode but is generally regarded as incompatible with alkyl carbonates. Here we find that contrary to common wisdom, cyclic carbonate solvents such as ethylene carbonate can dissolve up to 0.7 M LiNO3without any additives, largely improving the anode reversibility. We demonstrate the significance of our findings by upgrading various state‐of‐the‐art carbonate electrolytes with LiNO3, which provides large improvements in batteries composed of thin lithium (50 μm) anode and high voltage cathodes. Capacity retentions of 90.5 % after 600 cycles and 92.5 % after 200 cycles are reported for LiNi0.6Mn0.2Co0.2O2(2 mAh cm−2, 0.5 C) and LiNi0.8Mn0.1Co0.1O2cathode (4 mAh cm−2, 0.2 C), respectively. 1 Ah pouch cells (≈300 Wh kg−1) retain more than 87.9 % after 100 cycles at 0.5 C. This work illustrates that reforming traditional carbonate electrolytes provides a scalable, cost‐effective approach towards practical LMBs.