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In recent years, low-speed electric bicycles have formed a certain scale in some cities in Shandong due to their good economy, low cost of use, and convenient charging. However, the widespread use of lead-acid batteries in low-speed electric vehicles has limited their development to a large extent due to problems such as environmental pollution.
As a green energy efficient device with high energy density and high power density, the lithium ion capacitor has an energy density of 30Wh/kg, which is a strong alternative to lead-acid batteries. In recent years, the Advanced Energy Storage Technology Center of the Qingdao Institute of Bioenergy and Process Research, Chinese Academy of Sciences (Qingdao Institute of Energy Storage Industry Technology) Han Pengxian Senior Engineer and Yao Jianhua engineer led the research team in the national "863" project (2011AA050905) and Qingdao City. Under the support of the Strategic Emerging Industry Incubation Project (13-4-1-10-gx), Qingdao has successfully solved a series of key process technologies, including pre-embedded lithium, using Qingdao's abundant graphite resources, and developed cycle life for charge and discharge cycles. Lithium-ion capacitor device with 1500 capacity retention rate greater than 93%. Related technologies have applied for national patent protection and have authorized one.
In addition, the key carbon electrode materials for graphene-based lithium ion capacitors were explored around the demand for high-value utilization of graphite in Qingdao (J. Mater. Chem., 2012, 22: 24918; J. Mater. Chem. A, 2013, 1: 5949. And Catalytic materials for vanadium flow storage batteries. Early exploration of vanadium ion redox based on high-performance graphene-based materials (Carbon, 2011, 49: 693, Energy Environ. Sci., 2011, 4: 4710). Recently, vanadium-based flow energy storage cell RuSe/ was successfully prepared. Reduction of graphene oxide nanocomposites. Compared with pure reduced graphene oxide, the redox reversibility of vanadium ion to VO2+/VO2+ in vanadium redox flow battery is greatly improved, and the voltage efficiency, coulombic efficiency and energy efficiency of the battery are greatly improved (RSC Adv). ., 2014, 4: 20379).
The increase in the energy density of power lithium-ion batteries, in addition to the positive and negative electrode materials, the requirements for the electrolyte used are also increasing. Lithium ion battery electrolyte salt represented by lithium bis(trifluoromethylsulfonyl)imide (LiTFSI) as an additive has superior thermal stability, good electrical conductivity, and electrochemical stability compared to lithium hexafluorophosphate, however, How to solve the corrosion of the positive electrode aluminum foil current collector and reduce the internal resistance at the high potential window is an urgent problem to be solved.
The researchers successfully prepared a flexible graphite film material with a highly oriented structure and exhibited excellent electrochemical corrosion resistance in LiTFSI electrolyte lithium salt. Single cell at room temperature 1000 times, the capacity retention rate of up to 89%; high temperature 55 °C, charge and discharge cycle 300 times, the capacity retention rate is also more than 80%, and in this system using aluminum foil as the current collector, charge and discharge cycle 10 times Due to the severe corrosion of the aluminum foil, the electrode material peels off from the aluminum foil current collector and the capacity is drastically attenuated (Electrochem. Commun., 2014, DOI: 10.1016/j.elecom.2014.05.001).
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