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Electrolytes Enriched by Crown Ethers for Lithium Metal Batteries
Advanced Functional Materials ( IF 18.5 ) Pub Date : 2020-07-12 , DOI: 10.1002/adfm.202002578 Huaping Wang 1 , Jian He 1 , Jiandong Liu 1 , Shihan Qi 1 , Mingguang Wu 1 , Jie Wen 2 , Yanan Chen 2 , Yuezhan Feng 3 , Jianmin Ma 1
Advanced Functional Materials ( IF 18.5 ) Pub Date : 2020-07-12 , DOI: 10.1002/adfm.202002578 Huaping Wang 1 , Jian He 1 , Jiandong Liu 1 , Shihan Qi 1 , Mingguang Wu 1 , Jie Wen 2 , Yanan Chen 2 , Yuezhan Feng 3 , Jianmin Ma 1
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Lithium (Li) metal battery is considered the most promising next‐generation battery due to its low potential and high theoretical capacity. However, Li dendrite growth causes serious safety problems. Herein, the 15‐Crown‐5 (15‐C‐5) is reported as an electrolyte additive based on solvation shell regulation. The strong complex effect between Li+ ion and 15‐C‐5 can reduce the concentration of Li ions on the electrode surface, thus changing the nucleation, and repressing the growth of Li dendrites in the plating process. Significantly, the strong coordination of Li+/15‐C‐5 would be able to make them aggregate around the Li crystal surface, which could form a protective layer and favor the formation of a smooth and dense solid electrolyte interphase with high toughness and Li+ ion conductivity. Therefore, the electrolyte system with 2.0 wt% 15‐C‐5 achieves excellent electrochemical performance with 170 cycles at 1.0 mA cm−2 with capacity of 0.5 mA h cm−2 in symmetric Li|Li cells. The obviously enhanced cycle and rate performance are also achieved in Li|LiNi0.6Co0.2Mn0.2O2 (NCM622) full cells. The 15‐C‐5 demonstrates to be a promising additive for the electrolytes toward safe and efficient Li metal batteries.
中文翻译：
冠醚富集的锂金属电池电解液
金属锂（Li）电池由于其低电势和高理论容量而被认为是最有前途的下一代电池。但是，锂枝晶的生长会引起严重的安全问题。在本文中，根据溶剂化壳规定，将15-Crown-5（15-C-5）用作电解质添加剂。Li +离子与15-C-5之间的强复合作用可降低电极表面上Li离子的浓度，从而改变成核作用，并抑制电镀过程中Li树枝状晶体的生长。值得注意的是，Li + / 15-C-5的强配位将使它们在Li晶体表面周围聚集，这可以形成保护层并有利于形成具有高韧性和Li的光滑且致密的固体电解质中间相+离子电导率。因此，在对称的Li | Li电池中，含有2.0 wt％15–5的电解质体系在1.0 mA cm -2的条件下具有170个循环，具有0.5 mA h cm -2的容量，可实现出色的电化学性能。在Li | LiNi 0.6 Co 0.2 Mn 0.2 O 2（NCM622）满电池中也获得了明显增强的循环和倍率性能。15‐C‐5被证明是用于安全有效的锂金属电池电解液的有前途的添加剂。
更新日期：2020-07-12
中文翻译：
冠醚富集的锂金属电池电解液
金属锂（Li）电池由于其低电势和高理论容量而被认为是最有前途的下一代电池。但是，锂枝晶的生长会引起严重的安全问题。在本文中，根据溶剂化壳规定，将15-Crown-5（15-C-5）用作电解质添加剂。Li +离子与15-C-5之间的强复合作用可降低电极表面上Li离子的浓度，从而改变成核作用，并抑制电镀过程中Li树枝状晶体的生长。值得注意的是，Li + / 15-C-5的强配位将使它们在Li晶体表面周围聚集，这可以形成保护层并有利于形成具有高韧性和Li的光滑且致密的固体电解质中间相+离子电导率。因此，在对称的Li | Li电池中，含有2.0 wt％15–5的电解质体系在1.0 mA cm -2的条件下具有170个循环，具有0.5 mA h cm -2的容量，可实现出色的电化学性能。在Li | LiNi 0.6 Co 0.2 Mn 0.2 O 2（NCM622）满电池中也获得了明显增强的循环和倍率性能。15‐C‐5被证明是用于安全有效的锂金属电池电解液的有前途的添加剂。
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