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Lithium–Graphite Paste: An Interface Compatible Anode for Solid‐State Batteries
Advanced Materials ( IF 27.4 ) Pub Date : 2019-01-21 , DOI: 10.1002/adma.201807243 Jian Duan 1 , Wangyan Wu 1 , Adelaide M. Nolan 2 , Tengrui Wang 1 , Jiayun Wen 1 , Chenchen Hu 1 , Yifei Mo 2 , Wei Luo 1 , Yunhui Huang 1
Advanced Materials ( IF 27.4 ) Pub Date : 2019-01-21 , DOI: 10.1002/adma.201807243 Jian Duan 1 , Wangyan Wu 1 , Adelaide M. Nolan 2 , Tengrui Wang 1 , Jiayun Wen 1 , Chenchen Hu 1 , Yifei Mo 2 , Wei Luo 1 , Yunhui Huang 1
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All‐solid‐state batteries (ASSBs) with ceramic‐based solid‐state electrolytes (SSEs) enable high safety that is inaccessible with conventional lithium‐ion batteries. Lithium metal, the ultimate anode with the highest specific capacity, also becomes available with nonflammable SSEs in ASSBs, which offers promising energy density. The rapid development of ASSBs, however, is significantly hampered by the large interfacial resistance as a matched lithium/ceramic interface that is not easy to pursue. Here, a lithium–graphite (Li–C) composite anode is fabricated, which shows a dramatic modification in wettability with garnet SSE. An intimate Li–C/garnet interface is obtained by casting Li–C composite onto garnet‐type SSE, delivering an interfacial resistance as low as 11 Ω cm2. As a comparison, pure Li/garnet interface gives a large resistance of 381 Ω cm2. Such improvement can be ascribed to the experiment‐measured increased viscosity of Li–C composite and simulation‐verified limited interfacial reaction. The Li–C/garnet/Li–C symmetric cell exhibits stable plating/striping performance with small voltage hysteresis and endures a critical current density up to 1.0 mA cm−2. The full cell paired with LiFePO4 shows stable cycle performance, comparable to the cell with liquid electrolyte. The present work demonstrates a promising strategy to develop ceramic‐compatible lithium metal‐based anodes and hence low‐impedance ASSBs.
中文翻译：
锂石墨浆料：固态电池的接口兼容阳极
具有陶瓷基固态电解质（SSE）的全固态电池（ASSB）具有很高的安全性，这是传统锂离子电池无法达到的。金属锂是具有最高比容量的最终阳极，在ASSB中也可与不易燃的SSE一起使用，这提供了有希望的能量密度。然而，由于不容易追求的匹配锂/陶瓷界面，大的界面电阻极大地阻碍了ASSB的快速发展。在这里，制造了一个锂-石墨（Li-C）复合阳极，它显示了石榴石SSE润湿性的显着变化。通过将Li–C复合材料浇铸到石榴石型SSE上可获得紧密的Li–C /石榴石界面，界面电阻低至11Ωcm 2。作为比较，纯Li /石榴石界面具有381Ωcm 2的大电阻。这种改进可以归因于实验测量的Li–C复合材料的粘度增加和模拟验证的有限界面反应。Li-C /石榴石/ Li-C对称电池显示出稳定的镀覆/剥离性能以及较小的电压滞后，并且可以承受高达1.0 mA cm -2的临界电流密度。与具有液态电解质的电池相比，与LiFePO 4配对的完整电池显示出稳定的循环性能。本工作展示了开发陶瓷相容的锂金属基阳极并因此开发低阻抗ASSB的有前途的策略。
更新日期：2019-01-21
中文翻译：
锂石墨浆料：固态电池的接口兼容阳极
具有陶瓷基固态电解质（SSE）的全固态电池（ASSB）具有很高的安全性，这是传统锂离子电池无法达到的。金属锂是具有最高比容量的最终阳极，在ASSB中也可与不易燃的SSE一起使用，这提供了有希望的能量密度。然而，由于不容易追求的匹配锂/陶瓷界面，大的界面电阻极大地阻碍了ASSB的快速发展。在这里，制造了一个锂-石墨（Li-C）复合阳极，它显示了石榴石SSE润湿性的显着变化。通过将Li–C复合材料浇铸到石榴石型SSE上可获得紧密的Li–C /石榴石界面，界面电阻低至11Ωcm 2。作为比较，纯Li /石榴石界面具有381Ωcm 2的大电阻。这种改进可以归因于实验测量的Li–C复合材料的粘度增加和模拟验证的有限界面反应。Li-C /石榴石/ Li-C对称电池显示出稳定的镀覆/剥离性能以及较小的电压滞后，并且可以承受高达1.0 mA cm -2的临界电流密度。与具有液态电解质的电池相比，与LiFePO 4配对的完整电池显示出稳定的循环性能。本工作展示了开发陶瓷相容的锂金属基阳极并因此开发低阻抗ASSB的有前途的策略。
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