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Combining Solid Solution Strengthening and Second Phase Strengthening for Thinning Li Metal Foils
ACS Nano ( IF 15.8 ) Pub Date : 2023-07-10 , DOI: 10.1021/acsnano.3c04748 Zixing Guo 1 , Tengrui Wang 1 , Donghai Wang 1 , Henghui Xu 2 , Xuyang Liu 1 , Yiming Dai 1 , Hao Yang 1 , Yunhui Huang 2 , Wei Luo 1
ACS Nano ( IF 15.8 ) Pub Date : 2023-07-10 , DOI: 10.1021/acsnano.3c04748 Zixing Guo 1 , Tengrui Wang 1 , Donghai Wang 1 , Henghui Xu 2 , Xuyang Liu 1 , Yiming Dai 1 , Hao Yang 1 , Yunhui Huang 2 , Wei Luo 1
Affiliation
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Thin lithium (Li) metal foils have been proved to be indispensable yet elusive for practical high-energy-density lithium batteries. Currently, the realization of such thin foils (<50 μm) is impeded by the inferior mechanical processability of metallic Li. In this work, we demonstrate that the combination of solid solution strengthening and second phase strengthening, achieved by the addition of silver fluoride (AgF) to Li metal, can substantially enhance both the strength and ductility of metallic Li. Benefiting from the improved machinability, we succeed in fabricating an ultrathin (down to 5 μm), freestanding, and mechanically robust Li-AgF composite foil. More interestingly, the in situ-formed LixAg-LiF skeleton in the composite facilitates Li diffusion kinetics and uniform Li deposition, where the thin Li-AgF electrode displays a prolonged cycle life over 500 h at 1 mA cm–2 and 1 mAh cm–2 in a carbonate electrolyte. Coupled with a commercial LiCoO2 cathode (3.4 mAh cm–2), the LiCoO2||Li-AgF cell delivers a notable capacity retention of ∼90% over 100 cycles at 0.5 C with a low negative/positive ratio of 2.5.
中文翻译：
结合固溶强化和第二相强化来减薄锂金属箔
薄锂（Li）金属箔已被证明对于实用的高能量密度锂电池来说是不可或缺的但却难以实现。目前，金属锂机械加工性能较差，阻碍了这种薄箔（<50μm）的实现。在这项工作中，我们证明，通过在锂金属中添加氟化银（AgF）来实现固溶强化和第二相强化的结合，可以显着提高金属锂的强度和延展性。受益于改进的机械加工性能，我们成功制造了超薄（小至 5 μm）、独立且机械坚固的 Li-AgF 复合箔。更有趣的是，复合材料中原位形成的 Li x Ag-LiF 骨架有利于锂扩散动力学和均匀的锂沉积，其中薄 Li-AgF 电极在 1 mA cm –2和 1 mAh下表现出超过 500 小时的延长循环寿命cm –2在碳酸盐电解质中。与商用LiCoO 2阴极（3.4 mAh cm –2）相结合，LiCoO 2 ||Li-AgF 电池在 0.5 C 下 100 次循环后容量保持率高达 90%，负/正比低至 2.5。
更新日期：2023-07-10
中文翻译：
结合固溶强化和第二相强化来减薄锂金属箔
薄锂（Li）金属箔已被证明对于实用的高能量密度锂电池来说是不可或缺的但却难以实现。目前，金属锂机械加工性能较差，阻碍了这种薄箔（<50μm）的实现。在这项工作中，我们证明，通过在锂金属中添加氟化银（AgF）来实现固溶强化和第二相强化的结合，可以显着提高金属锂的强度和延展性。受益于改进的机械加工性能，我们成功制造了超薄（小至 5 μm）、独立且机械坚固的 Li-AgF 复合箔。更有趣的是，复合材料中原位形成的 Li x Ag-LiF 骨架有利于锂扩散动力学和均匀的锂沉积，其中薄 Li-AgF 电极在 1 mA cm –2和 1 mAh下表现出超过 500 小时的延长循环寿命cm –2在碳酸盐电解质中。与商用LiCoO 2阴极（3.4 mAh cm –2）相结合，LiCoO 2 ||Li-AgF 电池在 0.5 C 下 100 次循环后容量保持率高达 90%，负/正比低至 2.5。
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