Shenzhen Advanced Institute developed a multifunctional high-efficiency battery electrode material

(a) Synthetic process diagram of multi-function electrode; (b) Two-ion soft pack battery illuminates two yellow LED lamps; (c) Cyclic stability test of the prepared dual-ion battery

Recently, Tang Yongbing, a researcher at the Functional Film Materials Research Center of the Shenzhen Institute of Advanced Technology, Chinese Academy of Sciences, and his research team have successfully developed an integrated electrode with current collector, negative electrode active material, and separator triple function, which has been successfully applied to high efficiency and low cost. Dual-ion battery. The new structure effectively solves the problem of the volume change and the poor cycle performance of the metal negative electrode material in the charging and discharging process, and it is advantageous to simplify the battery production process and increase the battery energy density. Related Research Results Multifunctional Electrode Design Consisting of 3D Porous Separator Modulated with Patterned Anode for High-Performance Dual-Ion Batteries (A Multifunctional Electrode Design Containing 3-D Porous Separator and Metal Electrode and Its Application in High-Efficiency Dual-Ion Batteries ”) was published online on Advanced Functional Materials (DOI: 10.1002/adfm.201703035).

With the rapid development of the market for portable electronic devices and electric vehicles, the demand for high-energy density, low-cost secondary batteries has become increasingly urgent. At present, commercial lithium ion batteries are mostly made of graphite anode materials, the theoretical specific capacity is only 372 mAh g-1, and the compact density is low, which limits the further increase of energy density of lithium ion batteries. Through the alloying/dealloying reaction with lithium ions, the metal negative electrode generally has a larger specific capacity and is expected to obtain a higher energy density. Taking metal aluminum as an example, its theoretical specific capacity is as high as 2234 mAh g-1 (Li9Al4), and its reserves are abundant and the price is low. However, the aluminum negative electrode will have a certain volume expansion during the battery reaction, thereby affecting the cycle stability of the battery. In order to improve this situation, researchers have adopted various modification methods such as nanostructure design, alloy construction, and composite material construction for metal anodes. However, there are few reports on improvement strategies based on battery structure.

Based on the above considerations, Tang Yongbing and his team members Zhang Songquan, Wang Meng, and Zhou Zhiming successfully developed a multifunction electrode with current collector, negative electrode active material, and membrane triple function, and applied it to a new type of high-efficiency, low-cost dual ion. battery. The electrode comprises two major components of a three-dimensional porous polymer layer and a patterned metal aluminum foil layer. This structure design enables the integrated electrode to obtain excellent liquid absorption and liquid retention capabilities, and can effectively relieve the metal negative electrode during the electrochemical reaction process. The volume change and cracking powder problem. In addition, the multifunctional electrode design also effectively increases the proportion of negative active material, simplifies the battery manufacturing process, and reduces the manufacturing cost. Dual-ion batteries based on multifunctional electrode materials exhibit excellent electrochemical performances such as high operating voltage (average discharge voltage up to 4.2 V), long cycle performance (1000 cycles, capacity retention rate of 92.4%), high energy density (Energy density up to 158 Wh kg-1 at 10 C charge-discharge rate). The research results have guiding significance for the development of high-capacity, low-cost metal anodes, and are expected to promote the industrial application of secondary lithium-ion batteries based on metal anodes.

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