Recently, Tang Yongbing, a researcher of the Functional Thin Film Materials Research Center of the Shenzhen Institute of Advanced Technology, Chinese Academy of Sciences, and his research team, together with Professor Zheng Zijian of the Hong Kong Polytechnic University, proposed a flexible interface design strategy to control the interface stress of high-capacity silicon anodes It has been successfully applied to a new type of silicon-graphite dual-ion battery, and related research results "Flexible Interface Design for Stress Regulation of a Silicon Anode toward Highly Stable Dual-Ion Batteries" have been published online in the international materials journal "Advanced Materials" (Adv. Mater . 2020, 1908470). Silicon anodes have a high theoretical capacity (4200 mAh g-1) and abundant reserves. They are ideal anode materials for improving the energy density of dual-ion batteries. However, the serious volume expansion (> 300%) of silicon anodes restricts its application in dual-ion batteries. Although researchers have proposed various modification schemes such as nanometerization, porous structure, and composite structure, most of them use metal materials as current collectors. The rigid interface contact between the silicon anode and the current collector causes interface stress concentration, resulting in interface cracking or even The peeling of the active material makes it difficult for the cycle performance to meet the actual application requirements. Based on this, Tang Yongbing and his team members Jiang Chunlei, Xiang Lei, Miao Shijie and others proposed a flexible interface design strategy to effectively control the interface stress. By constructing the silicon negative electrode on the surface of the flexible polymer fabric, and designing an interface buffer layer with good conductivity between the two, the stress concentration at the interface is significantly relieved, and the material still maintains good structural integrity after 50,000 bendings. The team matched it with the expanded graphite cathode material and successfully constructed a new silicon-graphite dual ion battery (SGDIB); research shows that the dual ion battery has an ultra-high rate of up to 150 C (charging <30 seconds) and long cycle life The capacity retention rate after 2000 cycles at 10 C rate is as high as 97%. In addition, this flexible silicon-graphite battery exhibits excellent flexibility and bending resistance. The capacity retention rate after 1500 bending is ~ 84%, and the single pressure drop during 10,000 bending is only 0.0015%. It shows good application prospects in the field of high-performance flexible energy storage. This study also provides an effective solution for improving the cycling stability of high-capacity alloyed anodes. The research was supported by the National Natural Science Foundation of China, the Guangdong Science and Technology Plan, and the Shenzhen Science and Technology Plan. (A) Schematic diagram of the structural destruction of the conventional rigid interface silicon anode; (b) Design and preparation process of the flexible interface silicon anode and (c) schematic diagram of the stability mechanism of the elastic interface during the alloying / dealloying process.
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Shenzhen Advanced Institute and others have developed a highly stable dual-ion battery with a flexible interface