High-energy long-cycling all-solid-state lithium metal batteries enabled by silver-carbon composite anodes
High-energy long-cycling all-solid-state lithium metal batteries enabled by silver-carbon composite anodes
复制标题
DOI：
10.1038/s41560-020-0575-z
复制
发表时间：
2020-03-09
期刊：
影响因子：
56.7
通讯作者：
Han, In Taek
中科院分区：
文献类型：
--
作者：
Lee, Yong-Gun;Fujiki, Satoshi;Han, In Taek
具有锂金属阳极的全固态电池是超越传统锂离子电池性能的有力候选者。然而，锂枝晶生长不良和库仑效率低阻碍了它们的实际应用。在这里，我们报告了一种高性能的全固态锂金属电池，该电池具有硫化物电解质，由Ag-C复合阳极实现，没有多余的锂。我们发现薄的Ag-C层可以有效地调节锂的沉积，从而导致真正长的电化学循环性。在我们的全电池演示中，我们采用了具有高比容量（>210 mAh g(-1)）和高面容量（>6.8 mAh cm(-2)）的高镍层状氧化物阴极和银矾型硫化物电解质。采用热等静压技术改善了电极与电解液的接触。由此制备的原型袋状电池（0.6 Ah）具有高能量密度（bbb900 Wh l(-1)），稳定的库仑效率超过99.8%，长循环寿命（1000次）。固态锂金属电池是最有前途的可充电电池技术之一。在这里，作者报告了一种特殊的高性能原型固态袋电池，由硫化物电解质，高镍层状氧化物阴极，特别是没有过量锂的银碳复合阳极制成。
An all-solid-state battery with a lithium metal anode is a strong candidate for surpassing conventional lithium-ion battery capabilities. However, undesirable Li dendrite growth and low Coulombic efficiency impede their practical application. Here we report that a high-performance all-solid-state lithium metal battery with a sulfide electrolyte is enabled by a Ag-C composite anode with no excess Li. We show that the thin Ag-C layer can effectively regulate Li deposition, which leads to a genuinely long electrochemical cyclability. In our full-cell demonstrations, we employed a high-Ni layered oxide cathode with a high specific capacity (>210 mAh g(-1)) and high areal capacity (>6.8 mAh cm(-2)) and an argyrodite-type sulfide electrolyte. A warm isostatic pressing technique was also introduced to improve the contact between the electrode and the electrolyte. A prototype pouch cell (0.6 Ah) thus prepared exhibited a high energy density (>900 Wh l(-1)), stable Coulombic efficiency over 99.8% and long cycle life (1,000 times).Solid-state Li metal batteries represent one of the most promising rechargeable battery technologies. Here the authors report an exceptional high-performance prototype solid-state pouch cell made of a sulfide electrolyte, a high-Ni layered oxide cathode and, in particular, a silver-carbon composite anode with no excess Li.