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In Situ Construction of Lithium Silicide Host with Unhindered Lithium Spread for Dendrite‐Free Lithium Metal Anode
Advanced Functional Materials ( IF 18.5 ) Pub Date : 2020-12-06 , DOI: 10.1002/adfm.202008786 Xin‐Yang Yue 1 , Qi‐Yang Zhou 2 , Jian Bao 1 , Cui Ma 1 , Si‐Yu Yang 3 , Xun‐Lu Li 1 , Dalin Sun 1 , Fang Fang 1 , Xiao‐Jing Wu 1 , Yong‐Ning Zhou 1
Advanced Functional Materials ( IF 18.5 ) Pub Date : 2020-12-06 , DOI: 10.1002/adfm.202008786 Xin‐Yang Yue 1 , Qi‐Yang Zhou 2 , Jian Bao 1 , Cui Ma 1 , Si‐Yu Yang 3 , Xun‐Lu Li 1 , Dalin Sun 1 , Fang Fang 1 , Xiao‐Jing Wu 1 , Yong‐Ning Zhou 1
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Performance degradation and safety issue caused by Li dendrite growth and huge volume variation hinder the practical application of Li metal anode in high‐energy‐density lithium batteries. Li diffusion barrier of the host is a key parameter that determines the dendrite growth. Herein, a stable Li21Si5 alloy host with very low Li diffusion barriers is designed and prepared by an in situ metallurgical method using low‐cost micron silicon precursor. The low diffusion barrier of Li21Si5 host enables a dendrite‐free Li deposition behavior. It is revealed that the in‐situ formed porous Li21Si5 host not only has high Li affinity, but also suppresses volume variation of the electrode effectively and thus keeps superior structural stability during Li stripping and plating processes. As a result, this new Li metal anode with Li21Si5 host exhibits promising cycle stability and rate capability with low polarization in both symmetric and full cells. This study opens new opportunities for using alloy‐based materials as the hosts for Li composite anodes.
中文翻译：
无树突状锂金属阳极原位构建无阻扩锂硅化锂基体
锂枝晶生长和巨大的体积变化引起的性能下降和安全性问题阻碍了锂金属阳极在高能量密度锂电池中的实际应用。主体的锂扩散势垒是决定枝晶生长的关键参数。在此，采用低成本的微米级硅前驱体，通过原位冶金方法设计并制备了一种具有极低的Li扩散势垒的稳定的Li 21 Si 5合金主体。Li 21 Si 5基质的低扩散势垒可实现无枝晶的Li沉积行为。结果表明，原位形成的多孔Li 21 Si 5主体不仅具有高的Li亲和力，而且还有效地抑制了电极的体积变化，因此在Li剥离和电镀过程中保持了优异的结构稳定性。结果，这种新的具有Li 21 Si 5基质的Li金属阳极在对称电池和满电池中均显示出有希望的循环稳定性和速率能力，且极化率低。这项研究为使用合金基材料作为锂复合阳极的基质提供了新的机会。
更新日期：2020-12-06
中文翻译：
无树突状锂金属阳极原位构建无阻扩锂硅化锂基体
锂枝晶生长和巨大的体积变化引起的性能下降和安全性问题阻碍了锂金属阳极在高能量密度锂电池中的实际应用。主体的锂扩散势垒是决定枝晶生长的关键参数。在此，采用低成本的微米级硅前驱体，通过原位冶金方法设计并制备了一种具有极低的Li扩散势垒的稳定的Li 21 Si 5合金主体。Li 21 Si 5基质的低扩散势垒可实现无枝晶的Li沉积行为。结果表明，原位形成的多孔Li 21 Si 5主体不仅具有高的Li亲和力，而且还有效地抑制了电极的体积变化，因此在Li剥离和电镀过程中保持了优异的结构稳定性。结果，这种新的具有Li 21 Si 5基质的Li金属阳极在对称电池和满电池中均显示出有希望的循环稳定性和速率能力，且极化率低。这项研究为使用合金基材料作为锂复合阳极的基质提供了新的机会。
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