期刊
NANO LETTERS
卷 17, 期 5, 页码 3013-3020出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.7b00330
关键词
All-solid-state batteries; lithium-ion batteries; solid electrolytes; solution-process; electrodes; infiltration; coatings; sulfides
类别
资金
- Basic Science Research Program through National Research Foundation of Korea (NRF) - Ministry of Education [NRF-2014R1A1A2058760]
- KERI Primary research program of MSIP/NST [17-12-N0101-35]
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.
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