Localized iodinated poly (Vinylidene Difluoride)-based solid-state electrolyte for enhanced dendrite-free lithium metal batteries

IF 5.5 3区工程技术 Q1 ENGINEERING, CHEMICAL

Journal of the Taiwan Institute of Chemical Engineers Pub Date : 2025-02-15 DOI:10.1016/j.jtice.2025.106014

Tong Wu, Guodong Chen, Ying Zhu, Xingjie Chen, Yilin Zhu, Chunyan Lai

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Abstract

Background

Addressing the challenges of solid-state batteries in the new energy sector requires a focus on interface issues. The interface between the solid electrolyte and the lithium metal anode is crucial, as it significantly influences battery performance.

Methods

Iodine-introduced poly (vinylidene fluoride) (PVDF) solid electrolytes are synthesized by solution casting method. The electrolyte is found to form a stable LiI-containing and LiF-rich interface with the lithium metal anode by sputtering XPS.

Significant findings

The acquired electrolytes show outstanding lithium-ion conductivity (7.9 × 10⁻⁴ S cm⁻¹) and migration number (0.42). The Li || Li batteries with the proposed electrolyte can cycle stably for 1000 h at a current density of 0.1 mA cm⁻², the LFP || Li batteries maintain up to 97.2 % capacity retention at 0.5C after 1000 cycles, and 98.7 % capacity retention at 1C after 300 cycles. A pouch cell with the solid polymer electrolyte is able to undergo stably for >200 cycles at 0.5C.

Abstract Image

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用于增强无枝晶锂金属电池的局部碘化聚偏二氟乙烯固态电解质

解决固态电池在新能源领域的挑战需要关注接口问题。固体电解质和锂金属阳极之间的界面是至关重要的，因为它显着影响电池的性能。方法采用溶液铸造法制备了含碘聚偏氟乙烯（PVDF）固体电解质。通过溅射XPS发现，电解质与锂金属阳极形成稳定的含锂和富锂界面。获得的电解质具有优异的锂离子电导率（7.9 × 10−4 S cm−1）和迁移数（0.42）。在0.1 mA cm−2的电流密度下，锂离子电池||可以稳定循环1000小时，LFP ||锂电池在0.5℃下循环1000次后容量保持率高达97.2%，在1C下循环300次后容量保持率高达98.7%。使用固体聚合物电解质的袋状电池能够在0.5℃下稳定地进行200次循环。

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来源期刊

Journal of the Taiwan Institute of Chemical Engineers 工程技术-工程：化工

CiteScore

9.10

自引率

14.00%

发文量

362

审稿时长

35 days

期刊介绍： Journal of the Taiwan Institute of Chemical Engineers (formerly known as Journal of the Chinese Institute of Chemical Engineers) publishes original works, from fundamental principles to practical applications, in the broad field of chemical engineering with special focus on three aspects: Chemical and Biomolecular Science and Technology, Energy and Environmental Science and Technology, and Materials Science and Technology. Authors should choose for their manuscript an appropriate aspect section and a few related classifications when submitting to the journal online.