Infiltration of Solution-Processable Solid Electrolytes into Conventional Li-Ion-Battery Electrodes for All-Solid-State Li-Ion Batteries
Infiltration of Solution-Processable Solid Electrolytes into Conventional Li-Ion-Battery Electrodes for All-Solid-State Li-Ion Batteries
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DOI：
10.1021/acs.nanolett.7b00330
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发表时间：
2017-05-01
期刊：
影响因子：
10.8
通讯作者：
Jung, Yoon Seok
中科院分区：
文献类型：
--
作者：
Kim, Dong Hyeon;Oh, Dae Yang;Jung, Yoon Seok
散装型全固态锂离子电池（ASLB）在安全性和能量密度方面有可能优于传统锂离子电池（LIB）。硫化物SE材料因其高离子电导率（最大值接近10(-2) S cm(-1)）和可变形性而成为块状ASLB开发的关键。然而，硫化物材料对常见极性溶剂的严重反应性以及这些电解质的颗粒性质给用于制造ASLB电极的湿浆料工艺带来了严重的复杂性，例如溶剂和聚合物粘合剂的可用性以及离子接触和网络的形成。在这项工作中，我们报告了一种新的可扩展的 ASLB 电极制造方案，使用传统的复合 LIB 电极和均质 SE 溶液（乙醇中的 Li6PS5Cl (LPSCl) 或甲醇中的 0.4LiI-0.6Li(4)SnS(4)）。液化的LPSCl渗透到LIB电极的曲折多孔结构中并固化，提供紧密的离子接触和有利的离子渗滤。 LPSCl渗透的LiCoO2和石墨电极在0.14 mA cm(-2) (0.1 C)和30℃下表现出高可逆容量（141和364 mAh g(-1)），这不仅优于传统干混和浆料混合ASLB电极，而且与液体电解质电池相当。还展示了采用 LPSCl 渗透的 LiCoO2 和石墨电极的 ASLB 在 100 摄氏度下的良好电化学性能，突出了 ASLB 优异的热稳定性和安全性。
Bulk-type all-solid-state lithium-ion batteries (ASLBs) have the potential to be superior to conventional lithium-ion batteries (LIBs) in terms of safety and energy density. Sulfide SE materials are key to the development of bulk-type ASLBs because of their high ionic conductivity (max of similar to 10(-2) S cm(-1)) and deformability. However, the severe reactivity of sulfide materials toward common polar solvents and the particulate nature of these electrolytes pose serious complications for the wet-slurry process used to fabricate ASLB electrodes, such as the availability of solvent and polymeric binders and the formation of ionic contacts and networks. In this work, we report a new scalable fabrication protocol for ASLB electrodes using conventional composite LIB electrodes and homogeneous SE solutions (Li6PS5Cl (LPSCl) in ethanol or 0.4LiI-0.6Li(4)SnS(4) in methanol). The liquefied LPSCl is infiltrated into the tortuous porous structures of LIB electrodes and solidified, providing intimate ionic contacts and favorable ionic percolation. The LPSCl-infiltrated LiCoO2 and graphite electrodes show high reversible capacities (141 and 364 mA h g(-1)) at 0.14 mA cm(-2) (0.1 C) and 30 degrees C, which are not only superior to those for conventional dry-mixed and slurry-mixed ASLB electrodes but also comparable to those for liquid electrolyte cells. Good electrochemical performance of ASLBs employing the LPSCl-infiltrated LiCoO2 and graphite electrodes at 100 degrees C is also presented, highlighting the excellent thermal stability and safety of ASLBs.