Recently, Wu Zhongshuai, a researcher from the State Key Laboratory of Catalysis Fundamentals of the Dalian Institute of Chemical Physics, Chinese Academy of Sciences, and his team developed a photopolymer gel quasi-solid electrolyte with high room temperature ionic conductivity. The room temperature ionic conductivity, wide electrochemical window and excellent flexibility are used to construct a sodium metal battery with high specific energy, high rate and long cycle performance.
Sodium has similar characteristics to lithium. Because of its rich content and wide distribution, sodium ion battery becomes a competitive electrochemical energy storage device. Since the radius of Na+ is larger than that of Li+, the intercalation reaction of the graphite anode conventionally used in lithium ion batteries is not suitable for sodium ion batteries. In some researched anode materials, sodium metal anode has the characteristics of high theoretical capacity (1165 mAh/g) and low redox potential (-2.71V vs. standard hydrogen potential), which is regarded as the development of sodium with high output voltage and energy density Ideal negative electrode material for ion batteries. However, the sodium metal battery in the organic electrolyte system still has safety problems, such as electrolyte leakage and sodium dendrite formation, which inhibits its practical application.
In this study, the researchers prepared a new type of high ionic conductivity polymer by photopolymerization strategy, namely ethoxylated trimethylolpropane triacrylate (ETPTA) standard solid electrolyte, and built a high energy Density, high rate, long cycle solid sodium metal battery. The prepared quasi-solid electrolyte showed a high room temperature ionic conductivity of 1.2 mS/cm and a wide electrochemical window of 4.7 V (vs. Na+/Na), and effectively inhibited the growth of sodium dendrites; it was applied to sodium The metal battery exhibits excellent rate performance and long-term cycling stability. It can maintain a reversible discharge capacity of 55 mAh/g at 15 C; it can still maintain a capacity of 97% at a rate of 5 C for 1,000 cycles. The obtained sodium metal soft pack battery also exhibits excellent stability, flexibility and safety performance. This research provides a new direction for the development of room temperature high energy density flexible solid sodium metal batteries.
Related research results were published on "Advanced Energy Materials" (Advanced Energy Materials). The research work is supported by the National Key R&D Program and the Institute of Clean Energy Innovation of the Chinese Academy of Sciences.
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