In energy conversion and energy storage systems, electrochemical energy storage devices are one of the most convenient and efficient devices. In addition to traditional lithium-ion batteries, new energy storage devices such as lithium-sulfur batteries, sodium-ion batteries, and super capacitors are also developing rapidly. Electrochemical energy storage devices are composed of four parts, namely positive electrode, negative electrode, diaphragm, and electrolyte. Among them, the electrolyte plays the role of conducting ions and isolating electrons, and is an indispensable part of the whole device. However, the electrolytes currently used usually contain flammable organic solvents, which makes current energy storage devices have high safety hazards. Therefore, the development of solid electrolytes with high safety instead of liquid electrolytes is an important way to solve the safety of high energy storage devices.
According to the composition classification, solid electrolytes can be divided into three categories: polymer solid electrolytes, inorganic solid electrolytes, and polymer/inorganic composite solid electrolytes. Among them, polymer solid electrolytes have good interfacial compatibility, and the preparation method is simple, which is convenient for large-scale production. However, most polymer solid electrolytes are composed of semi-crystalline polymers, and their ionic conductivity is low at room temperature (ionic conductivity is less than 10 ^ -6 S/cm). In addition, the instability of the solid polymer electrolyte/electrode interface hinders their wide application.
At present, polymer solid electrolytes mainly include three types: polyethylene oxide (PEO) based, polycarbonate (PC) based, and polysiloxane based solid electrolyte systems. PEO was first discovered in 1973 to dissolve metal salts, and it is still one of the most well-studied and widely used polymer electrolytes.
To delve deeper into solid-state electrolytes and understand polymer solid-state electrolytes. On January 7-8, 2022, the "3rd High Specific Energy Solid-State Battery Key Materials Technology Conference" hosted by China Powder Network will be held at the Oriental Jianguo Hotel in Wuhan, Hubei. Professor Tang Yuxin from Fuzhou University will give a report on "Design of High-Performance Polyethylene Oxide-Based Polymer Solid-State Electrolytes". The presenter conducted research on overcoming the limiting factors of polymer electrolytes. For example, the introduction of strong Lewis acid fluoride with dual functions in polyethylene oxide (PEO) -based polymer electrolytes: on the one hand, the interaction between Lewis acid and anion can promote the dissociation of lithium salts and improve the transfer efficiency of lithium ions; on the other hand; the electrolyte/electrode interface generates a LiF-rich interface layer in situ, inhibits the uneven deposition of lithium metal and the continuous adverse reactions with the PEO matrix, and improves the interfacial stability and cycle stability of PEO-based electrolyte lithium metal batteries.
| Name | Dr. Yuxin Tong |
|---|---|
| Position | Professor and PhD Supervisor of Fuzhou University, the country introduces young talents overseas |
| Research Area | Basic and applied research on energy storage batteries |
| Results | Published more than 110 academic articles in professional journals in the fields of materials and chemical engineering |
Hu Fangyuan, Wang Lin et al. Research progress of polymer solid electrolytes
