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A Novel 3D Li/Li9Al4/Li-Mg Alloy Anode for Superior Lithium Metal Batteries
Advanced Functional Materials ( IF 18.5 ) Pub Date : 2023-01-13 , DOI: 10.1002/adfm.202213905 Yijuan Li 1 , Junpeng Li 2 , Hong Xiao 1 , Tangchao Xie 1 , Weitao Zheng 1 , Jialang He 1 , Hengji Zhu 1 , Shaoming Huang 1
Advanced Functional Materials ( IF 18.5 ) Pub Date : 2023-01-13 , DOI: 10.1002/adfm.202213905 Yijuan Li 1 , Junpeng Li 2 , Hong Xiao 1 , Tangchao Xie 1 , Weitao Zheng 1 , Jialang He 1 , Hengji Zhu 1 , Shaoming Huang 1
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Lithium metal has been recognized as the most promising anode material due to its high capacity and low electrode potential. However, the high reactivity, infinite volume variation, and uncontrolled dendrites growth of Li during long-term cycling severely limit its practical applications. To address these issues, herein, a novel 3D Al/Mg/Li alloy (denoted as AM-Li) anode is designed and constructed by a facile smelting-rolling strategy, which improves the surface stability, electrochemical cycling stability, and rate capability in lithium metal batteries. Specifically, the optimized AM-Li|AM-Li symmetric cell exhibits low polarization voltage (< 20 mV) and perfect cycling stability at 1 mA cm−2-1 mAh cm−2 for more than 1600 h. Moreover, the AM-Li|NCM811 full cell exhibits superior rate capability up to 5 C and excellent cyclability for 100 cycles at 0.5 C with a high capacity retention of 90.8%. The realization of lithium-poor or lithium-free anode materials will be a major development trend of anode materials in the future. Therefore, the research shows that the construction of 3D alloy framework is beneficial to improve the cycling stability of Li anodes by suppressing the volume expansion effect and Li dendrite growth, which will promote the further development of lithium-poor metal anodes.
中文翻译：
用于高级锂金属电池的新型 3D Li/Li9Al4/Li-Mg 合金负极
锂金属由于其高容量和低电极电位而被公认为最有前途的负极材料。然而，锂在长期循环过程中的高反应性、无限的体积变化和不受控制的枝晶生长严重限制了其实际应用。为了解决这些问题，在此，一种新型的 3D Al/Mg/Li 合金（表示为 AM-Li）负极通过简单的熔炼-轧制策略设计和构建，提高了表面稳定性、电化学循环稳定性和倍率性能锂金属电池。具体而言，优化的 AM-Li|AM-Li 对称电池在 1 mA cm -2 -1 mAh cm -2下表现出低极化电压（< 20 mV）和完美的循环稳定性超过 1600 小时。此外，AM-Li|NCM811 全电池表现出高达 5 C 的卓越倍率性能和 0.5 C 下 100 次循环的出色循环性能以及 90.8% 的高容量保持率。实现贫锂或无锂正极材料将是未来正极材料的一大发展趋势。因此，研究表明，3D合金骨架的构建有利于通过抑制体积膨胀效应和锂枝晶生长来提高锂负极的循环稳定性，这将促进贫锂金属负极的进一步发展。
更新日期：2023-01-13
中文翻译：
用于高级锂金属电池的新型 3D Li/Li9Al4/Li-Mg 合金负极
锂金属由于其高容量和低电极电位而被公认为最有前途的负极材料。然而，锂在长期循环过程中的高反应性、无限的体积变化和不受控制的枝晶生长严重限制了其实际应用。为了解决这些问题，在此，一种新型的 3D Al/Mg/Li 合金（表示为 AM-Li）负极通过简单的熔炼-轧制策略设计和构建，提高了表面稳定性、电化学循环稳定性和倍率性能锂金属电池。具体而言，优化的 AM-Li|AM-Li 对称电池在 1 mA cm -2 -1 mAh cm -2下表现出低极化电压（< 20 mV）和完美的循环稳定性超过 1600 小时。此外，AM-Li|NCM811 全电池表现出高达 5 C 的卓越倍率性能和 0.5 C 下 100 次循环的出色循环性能以及 90.8% 的高容量保持率。实现贫锂或无锂正极材料将是未来正极材料的一大发展趋势。因此，研究表明，3D合金骨架的构建有利于通过抑制体积膨胀效应和锂枝晶生长来提高锂负极的循环稳定性，这将促进贫锂金属负极的进一步发展。
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