Preparation and performances of gelatin/polyethylene oxide composite electrolyte for high-voltage solid-state lithium batteries

doi:10.19799/j.cnki.2095-4239.2023.0409

Abstract

Abstract:

The unstable interface of polyethylene oxide (PEO)-based electrolytes at high voltage seriously hinders their practical application in high-energy density solid-state lithium batteries.This study presents a new approach of constructing high-voltage solid-state lithium batteries based on the PEO/gelatin composite electrolyte. The results indicate that the oxidative decomposition of the hydroxyl groups at the end of the PEO-based electrolyte chain mainly causes the voltage noise behavior of the Li | PEO | NCM811 at voltages greater than 4.0 V. To address this issue, the gelatin carboxyl group is utilized to form hydrogen bonds with the hydroxyl end groups of the PEO chain, slowing down the PEO hydroxyl group oxidation under a high voltage. The hydroxyl terminal oxidation side reaction of the PEO/gelatin composite electrolyte is suppressed at 4.0—4.3 V after gelatin addition. The results show that adding macromolecular gelatin reduces the PEO crystallinity and forms a fast Li ion conductor pathway that improves the ion conductivity of the composite electrolyte, which consequently improves the high-voltage stability of the matched high-voltage cathode, NCM811. This work presents a simple approach of constructing PEO-based polymer electrolytes for high-voltage solid-state lithium batteries.

Key words: solid-state lithium batteries, polyethylene oxide, composite electrolyte, gelatin, high voltage, interface stability

CLC Number:

O 646.21

Yansen ZHENG, Yongyin WANG, Jiuqing GUI, Zhuohao XIE, Yue XU, Qiaoying CAO, Yuehua XU, Yingliang LIU, Yeru LIANG. Preparation and performances of gelatin/polyethylene oxide composite electrolyte for high-voltage solid-state lithium batteries[J]. Energy Storage Science and Technology, 2023, 12(10): 3064-3074.

Figures/Tables 6

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