Synergetic control of heterogeneous nucleation and 3D mixed electron/ion-conducting paths for dendrite-free Li metal anodes
Synergetic control of heterogeneous nucleation and 3D mixed electron/ion-conducting paths for dendrite-free Li metal anodes
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DOI：
10.1016/j.cej.2023.142034
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发表时间：
2023-02
影响因子：
15.1
通讯作者：
Cheng Ye;Zhongyong Zhang;Jun Yu Li;Weiwei Jiang;Guoyu Ding;Wenjing Li;Jing Zhang;Long Huang-
中科院分区：
文献类型：
--
作者：
Cheng Ye;Zhongyong Zhang;Jun Yu Li;Weiwei Jiang;Guoyu Ding;Wenjing Li;Jing Zhang;Long Huang-
通过Ag2Se包覆碳纤维衣物(Ag2Se@Cfc)与熔融Li的原位转化反应，在碳纤维衣物中形成快Li+离子导电Li2Se和电子导电Ag，成功地制备了三维混合电子/离子导电材料Ag-Li2Se@CfC。此外，在Ag-Li2Se@CFC支架中原位生成的银纳米颗粒具有良好的亲锂性能，是锂沉积的异相成核纳米种子，从而导致了均匀的锂沉积和剥离行为。由于异相成核的协同控制和Ag-Li2Se@CfC支架的3D混合电子/离子传导路径，所得到的Ag-Li2Se@CfC/Li复合阳极可以有效地抑制Li枝晶的生长，表现出良好的长期循环稳定性，在对称电池中表现出良好的长期循环稳定性，在1 mA/cm−2下的过电势极低，为3 mV。此外，当与LiFePO4、LiNi0.8Co0.1Mn0.1O2或硫/碳复合阴极组合在一起组装潜在应用的硬币型全电池时，Ag-Li2Se@CFC/Li复合阳极仍可提供更好的循环稳定性和倍率性能。这些令人鼓舞的结果表明，异质成核和3D混合电子/离子导电支架的协同控制是实现无树枝状锂金属阳极的一种有前途的策略。
A 3D mixed electron/ion-conducting Ag-Li2Se@CFC scaffold was successfully fabricated through thein-situconversion reactions between Ag2Se-coated carbon fiber clothes (Ag2Se@CFC) and molten Li to form fast Li+ion-conducting Li2Se and electron-conducting Ag in the carbon fiber clothes during the molten Li impregnation process. Moreover, thein-situformed Ag nanoparticles in the Ag-Li2Se@CFC scaffolds have superior lithiophilic nature and act as heterogeneous nucleation nanoseeds for Li deposition, thus inducing the uniform behaviors of Li plating and stripping. Due to the synergetic control of heterogeneous nucleation and the 3D mixed electron/ion-conducting paths of the Ag-Li2Se@CFC scaffolds, the resulted Ag-Li2Se@CFC/Li composite anodes could effectively prohibit the Li dendrite growth, demonstrating excellent long-term cycling stability of Li plating/stripping in symmetric cells with extremely low overpotentials of 3 mV at 1 mA cm−2over 1000 cycles. Furthermore, when coupled with LiFePO4, LiNi0.8Co0.1Mn0.1O2or sulfur/carbon composite cathodes to assemble coin-typed full cells for potential applications, the Ag-Li2Se@CFC/Li composite anodes still deliver improved cycling stabilities and rate performances. These encouraging results suggest the synergetic control of heterogeneous nucleation and 3D mixed electron/ion-conducting scaffolds should be a promising strategy for achieving dendrite-free Li metal anodes.