Safety regulation of gel electrolytes in electrochemical energy storage devices

Abstract

Electrochemical energy storage devices, such as lithium ion batteries (LIBs), supercapacitors and fuel cells, have been vigorously developed and widely researched in past decades. However, their safety issues have appealed immense attention. Gel electrolytes (GEs), with a special state in-between liquid and solid electrolytes, are considered as the most promising candidates in electrochemical energy storage because of their high safety and stability. This review summarized the recent progresses made in the application of GEs in the safety regulation of the electrochemical energy storage devices. Special attention was paid to the gel polymer electrolytes, the organic low molecule-mass GEs, as well as the fumed silica-based and siloxane-based GEs. Finally, the current challenges and future directions were proposed in terms of the development of GEs.

Recent progress on biomass‐derived ecomaterials toward advanced rechargeable lithium batteries

“…Moreover, the generation and growth of Li dendrites have the possibility of permeating across separator and lead to battery short circuit, causing thermal runaway and final combustion or explosion of batteries . Gel polymer electrolytes that combine the advantages of highly interfacial infiltration of liquid electrolyte and high solidification strength of solid electrolyte have been regard as a promising strategy to mitigate safety hazards . Liquid organic electrolyte can be fixed and reserved in micro gel polymer framework structure, which can refrain from the leakage of electrolyte and alleviate their exhaustion with Li metal.…”

“…37 Gel polymer electrolytes that combine the advantages of highly interfacial infiltration of liquid electrolyte and high solidification strength of solid electrolyte have been regard as a promising strategy to mitigate safety hazards. 53 Liquid organic electrolyte can be fixed and reserved in micro gel polymer framework structure, which can refrain from the leakage of electrolyte and alleviate their exhaustion with Li metal. In addition, high mechanical flexibility and elasticity of gel electrolyte can also function as a physical barrier to not only separate from the positive and negative electrodes but also prevent the growth of Li dendrites, thus enhancing battery safety.…”

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“…However, the Li dendrite formation/growth results in serious safety risks such as overheating and short circuit [5,6]. Additionally, the commonly used organic liquid electrolytes with high flammability, narrow electrochemical window and more side reactions aggravate the safety issues [7,8].…”

微纳结构过渡金属化合物能源转化电催化剂研究进展

“…Developing renewable and environment-friendly energy systems has shown promising prospects for the sustainable development of human society [4][5][6][7]. Among various strategies, the electrochemical energy conversion and storage devices have drawn great attentions due to their low carbon emissions and high energy densities [8]. Typically, these devices with different applications usually involve different electrochemical reactions, such as hydrogen evolution reaction (HER), oxygen evolution reaction (OER), oxygen reduction reaction (ORR), CO 2 electroreduction reaction (CO 2 RR) and alkohol electrooxidation reaction (AOR) [9][10][11][12].…”

“…Considering the cost and reducing the dependency of noble metals, great efforts have been tried to develop nonprecious metal-based electrocatalysts, such as transition metal-based, transition metal compound (TMC)based and carbon-based nanomaterials [8,17]. Especially, TMCs (such as oxides, sulfides, selenides, phosphides, carbides and nitrides) have shown promising prospects in different applications.…”