Inhomogeneous lithium-storage reaction triggering the inefficiency of all-solid-state batteries  

作　　者：Jaeyoung Kim Wontae Lee Jangwhan Seok Eunkang Lee Woosung Choi Hyunyoung Park Soyeong Yun Minji Kim Jun Lim Won-Sub Yoon 

机构地区：[1]Department of Energy Science,Sungkyunkwan University,Suwon 16419,South Korea [2]Pohang Accelerator Laboratory,Pohang University of Science and Technology,Pohang 37673,South Korea

出　　处：《Journal of Energy Chemistry》2022年第3期226-236,I0008,共12页能源化学（英文版）

基　　金：supported by the National Research Foundation of Korea(NRF)grant funded by the Korea government(MSIT)(No.NRF-2021M3H4A1A02045953 and No.NRF-2021R1C1C2007797)。

摘　　要：All-solid-state batteries offer an attractive option for developing safe lithium-ion batteries.Among the various solid-state electrolyte candidates for their applications,sulfide solid electrolytes are the most suitable owing to their high ionic conductivity and facile processability.However,their performance is extensively lower compared with those of conventional liquid electrolyte-based batteries mainly because of interfacial reactions between the solid electrolytes and high capacity cathodes.Moreover,the kinetic evolution reaction in the composite cathode of all-solid-state lithium batteries has not been actively discussed.Here,electrochemical analyses were performed to investigate the differences between the organic liquid electrolyte-based battery and all-solid-state battery systems.Combined with electrochemical analyses and synchrotron-based in situ and ex situ X-ray analyses,it was confirmed that inhomogeneous reactions were due to physical contact.Loosely contacted and/or isolated active material particles account for the inhomogeneously charged regions,which further intensify the inhomogeneous reactions during extended cycles,thereby increasing the polarization of the system.This study highlighted the benefits of electrochemo-mechanical integrity for securing a smooth conduction pathway and the development of a reliable homogeneous reaction system for the success of solid-state batteries.

关 键 词：Liquid electrolyte lithium batteries All-solid-state lithium batteries Ni-rich cathode Synchrotron-based X-ray techniques Inhomogeneous reaction 

分 类 号：TM912[电气工程—电力电子与电力传动]