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In-situ polymerized electrolyte modified with oligomeric cyclotetrasiloxane for all-solid-state lithium metal batteries.

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Title: In-situ polymerized electrolyte modified with oligomeric cyclotetrasiloxane for all-solid-state lithium metal batteries.
Authors: He, Xia1 (AUTHOR), Lin, Jingfeng1 (AUTHOR), Ge, Guanglong1 (AUTHOR), Yan, Fei1 (AUTHOR), Zhu, Kun1 (AUTHOR), Shen, Bo1 (AUTHOR), Zhai, Jiwei1 (AUTHOR) apzhai@tongji.edu.cn
Source: Journal of Power Sources. Jan2023, Vol. 555, pN.PAG-N.PAG. 1p.
Subjects: Superionic conductors, Lithium cells, Solid state batteries, Solid electrolytes, Electrolytes, Ionic conductivity, Energy density
Abstract: High energy density and high-safety is expected for the ongoing revolution of lithium-ion batteries (LIBs). All-solid-state lithium metal batteries (ASSLMBs) are promising to break through the bottleneck of traditional liquid LIBs. However, the huge interfacial resistance between solid electrolytes and cathode is a hinder to the develop ASSLMBs. Herein, we report an in-situ polymerized solid-state electrolytes (SPE) based on oligomeric cyclotetrasiloxane (CTS) and polyethylene glycol diglycidyl ether (PEGDE) to solve this problem. CTS can provide a three-dimensional skeleton for the cross-linked SPE, which can effectively improve the properties of SPE. When the CTS content is 10 wt%, SPE exhibits a high ionic conductivity at 28 °C (0.37 mS cm−1) and a wide electrochemical stable window of 5.02 V (vs Li/Li+). Benefiting from the in-situ polymerization properties, ionic transportation at the cathode/electrolyte interface can be enhanced. Especially, the in-situ SPE exhibits outstanding compatibility against lithium metal over 600 h at a current density of 0.2 mA cm−2, the Li/SPE/LiCoO 2 can deliver a capacity of 120.5 mAh g−1 at 0.05 C after 100 cycles. Our study, therefore, provides a new type of SPE to meet both interfacial and bulk conductivity requirements for ASSLMBs. [Display omitted] • SPE is in-situ polymerized based on CTS for ASSLMBs. • As-prepared SPE obtain a high ionic conductivity at room temperature. • The wide electrochemical window (5.02 V) of SPE-1 match well with LiCoO 2. • As-prepared SPE-1 has a good inhibition against lithium dendrite growth. [ABSTRACT FROM AUTHOR]
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Database: Engineering Source
Description
Abstract:High energy density and high-safety is expected for the ongoing revolution of lithium-ion batteries (LIBs). All-solid-state lithium metal batteries (ASSLMBs) are promising to break through the bottleneck of traditional liquid LIBs. However, the huge interfacial resistance between solid electrolytes and cathode is a hinder to the develop ASSLMBs. Herein, we report an in-situ polymerized solid-state electrolytes (SPE) based on oligomeric cyclotetrasiloxane (CTS) and polyethylene glycol diglycidyl ether (PEGDE) to solve this problem. CTS can provide a three-dimensional skeleton for the cross-linked SPE, which can effectively improve the properties of SPE. When the CTS content is 10 wt%, SPE exhibits a high ionic conductivity at 28 °C (0.37 mS cm−1) and a wide electrochemical stable window of 5.02 V (vs Li/Li+). Benefiting from the in-situ polymerization properties, ionic transportation at the cathode/electrolyte interface can be enhanced. Especially, the in-situ SPE exhibits outstanding compatibility against lithium metal over 600 h at a current density of 0.2 mA cm−2, the Li/SPE/LiCoO 2 can deliver a capacity of 120.5 mAh g−1 at 0.05 C after 100 cycles. Our study, therefore, provides a new type of SPE to meet both interfacial and bulk conductivity requirements for ASSLMBs. [Display omitted] • SPE is in-situ polymerized based on CTS for ASSLMBs. • As-prepared SPE obtain a high ionic conductivity at room temperature. • The wide electrochemical window (5.02 V) of SPE-1 match well with LiCoO 2. • As-prepared SPE-1 has a good inhibition against lithium dendrite growth. [ABSTRACT FROM AUTHOR]
ISSN:03787753
DOI:10.1016/j.jpowsour.2022.232346