Article thumbnail

All-Solid-State Lithium Battery Working without an Additional Separator in a Polymeric Electrolyte

By Seonggyu Cho, Shinho Kim, Wonho Kim, Seok Kim and Sungsook Ahn

Abstract

Considering the safety issues of Li ion batteries, an all-solid-state polymer electrolyte has been one of the promising solutions. Achieving a Li ion conductivity of a solid-state electrolyte comparable to that of a liquid electrolyte (&gt;1 mS/cm) is particularly challenging. Even with characteristic ion conductivity, employment of a polyethylene oxide (PEO) solid electrolyte has not been sufficient due to high crystallinity. In this study, hybrid solid electrolyte (HSE) systems have been designed with Li<sub>1.3</sub>Al<sub>0.3</sub>Ti<sub>0.7</sub>(PO<sub>4</sub>)<sub>3</sub> (LATP), PEO and lithium bis(trifluoromethanesulfonyl)imide (LiTFSI). A hybrid solid cathode (HSC) is also designed using LATP, PEO and lithium cobalt oxide (LiCoO<sub>2</sub>, LCO)&#8212;lithium manganese oxide (LiMn<sub>2</sub>O<sub>4</sub>, LMO). The designed HSE system has 2.0 &#215; 10<sup>&#8722;4</sup> S/cm (23 &#176;C) and 1.6 &#215; 10<sup>&#8722;3</sup> S/cm (55 &#176;C) with a 6.0 V electrochemical stability without an additional separator membrane introduction. In these systems, succinonitrile (SN) has been incorporated as a plasticizer to reduce crystallinity of PEO for practical all-solid Li battery system development. The designed HSC/HSE/Li metal cell in this study operates without any leakage and short-circuits even under the broken cell condition. The designed HSC/HSE/Li metal cell in this study displays an initial charge capacity of 82/62 mAh/g (23 &#176;C) and 123.4/102.7 mAh/g (55 &#176;C). The developed system overcomes typical disadvantages of internal resistance induced by Ti ion reduction. This study contributes to a new technology development of all-solid-state Li battery for commercial product design

Topics: secondary Li ion battery, all-solid-state battery, solid polymer electrolyte, succinonitrile (SN), lithium(trifluoromethanesulfonyl)imide (LiTFSI), Organic chemistry, QD241-441
Publisher: MDPI AG
Year: 2018
DOI identifier: 10.3390/polym10121364
OAI identifier: oai:doaj.org/article:dc182cb23a444d5d86ebf33ef5957daa
Journal:
Download PDF:
Sorry, we are unable to provide the full text but you may find it at the following location(s):
  • https://doaj.org/article/dc182... (external link)
  • https://www.mdpi.com/2073-4360... (external link)
  • https://doaj.org/toc/2073-4360 (external link)
  • Suggested articles


    To submit an update or takedown request for this paper, please submit an Update/Correction/Removal Request.