Modifying Ionogel Solid-Electrolytes for Complex Electrochemical Systems

doi:10.1021/acsaem.2c02085

2022-10-03

DOI：10.1021/acsaem.2c02085

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摘要

En 中文

The solution processability of ionogel solid electrolytes has recently garnered attention in the Li-ion battery community as a means to address the interface and fabrication issues commonly associated with most solid electrolytes. However, the trapped ionic liquid (ILE) component has hindered the electrochemical performance. Herein, we present a process to tune the properties by replacing the ILE in a silica-based ionogel after fabrication with a liquid component befitting the desired application. Electrochemical cycling under various conditions showcases gels containing different liquid components incorporated into LiFePO4 (LFP)/gel/Li cells: high power (455 W kg-1 at a 1 C discharge) systems using carbonates, low temperatures (-40 degrees C) using ethers, or high temperatures (100 degrees C) using ionic liquids. Fabrication of additive manufactured cells utilizing the exchanged carbonate-based system is demonstrated in a planar LFP/Li4Ti5O12 (LTO) system, where a marked improvement over an ionogel is found in terms of rate capability, capacity, and cycle stability (118 vs 41 mA h g-1 at C/4). This process represents a promising route to create a separator-less cell, potentially in complex architectures, where the electrolyte properties can be facilely tuned to meet the required conditions for a wide range of battery chemistries while maintaining a uniform electrolyte access throughout cast electrodes.

Keyword:

ionogels

Li-ion batteries

custom architectures

solvent exchange

electrolyte

期刊

ACS Applied Energy Materials

IF:

5.5

论文数:

1.1W

被引数:

4.5W

机构

united states department of energy (doe)

学者数:

11.3W

论文数: 9.6W

被引数: 246

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