Solid-state sodium battery is the next generation of energy storage battery, and solid electrolyte is an important factor limiting its development

At this stage, lithium-ion batteries are still the mainstream products in the market, and with the rapid development of the new energy vehicle industry, the demand for lithium-ion batteries is continuously being released.

Solid-state sodium batteries (SSSBs) have the dual performance of solid-state batteries and sodium-ion batteries , and are the ideal energy storage batteries for the next generation. Compared with lithium-ion batteries, solid-state sodium batteries have the advantages of low cost and excellent safety performance. Compared with liquid batteries, solid-state sodium batteries have the advantages of good thermal stability, high battery energy density, and high safety. With its excellent performance, solid-state sodium batteries have received great attention from many countries around the world in recent years. However, as a new type of battery, the development and application of solid-state sodium batteries still face challenges in technology and materials .

According to the "2022-2026 China Solid-State Sodium Battery Industry Market Monitoring and Future Development Prospects Research Report" released by the New World Industry Research Center, due to technical limitations, the global solid-state sodium battery market is still in its early stages. Solid-state sodium batteries are a hot research and development topic for researchers from various countries. Globally, companies or institutions engaged in solid-state sodium battery research and development include Nippon Electric Glass, Ningbo Institute of Materials, Chinese Academy of Sciences, Dalian Institute of Chemical Physics, and University of Geneva.

At this stage, lithium-ion batteries are still the mainstream products in the market, and with the rapid development of the new energy vehicle industry, the demand for lithium-ion batteries is continuously released. However, due to the limited global lithium resources, lithium-ion batteries are not enough to support the large-scale development of the new energy vehicle industry. Sodium-ion batteries are not as energy dense as lithium-ion batteries, but global sodium resources are abundant and raw materials are easily available. Against the background of the continued rise in lithium prices, sodium-ion batteries have gradually been used in areas with lower energy density requirements such as grid energy storage, low-speed electric vehicles , and household energy storage. Domestic sodium-ion battery-related companies include CATL , China National Salt Chemical, Huayang Shares, Zhejiang Medicine, etc.

Sodium-ion batteries are mainly composed of positive electrodes, negative electrodes, current collectors, electrolytes, separators and other parts. Traditional sodium-ion batteries mostly use liquid lithium batteries , but liquid sodium batteries have problems such as leakage and combustion, and their safety is relatively low. The use of solid-state electrolytes can improve the safety of sodium-ion batteries. With the upgrading of market demand, solid-state sodium batteries have gradually become a new research direction in the field of sodium-ion batteries.

At present, solid-state sodium battery electrolytes mainly include solid polymer electrolytes (SPEs), inorganic solid electrolytes (ISEs), and composite solid electrolytes (CSEs). The most widely studied are oxides, sulfides, and borohydrides. Electrolyte materials are the most important factor restricting the development of solid-state sodium batteries. In order to realize the large-scale application of solid-state sodium batteries, related companies still need to further explore new solid-state sodium battery electrolyte materials.

Industry analysts from Xinshijie said that solid-state sodium batteries are the next generation of ideal energy storage batteries, which have multiple advantages such as high safety, low cost, and good thermal stability. Solid-state sodium batteries have the dual advantages of sodium-ion batteries and solid-state batteries, so they have attracted much attention from researchers at home and abroad. However, due to technical limitations, solid-state sodium batteries have not yet been widely used, and solid electrolytes are an important factor limiting their market development.