Research progress of high energy density lithium cobalt oxide batteries

The research progress of high-energy density lithium cobalt oxide batteries With the rapid development of electric vehicles and mobile electronic devices, higher requirements have been put forward for the energy density of lithium batteries that supply power. According to the thrust principle, the energy density of lithium batteries is close to its upper limit, so there is little room for improvement. In contrast, metal lithium batteries with lithium as the negative electrode have unparalleled advantages in improving energy density. However, according to the repeated SEI rupture and the challenges of the first generation, the volume of the lithium anode is expanded, the Coulomb force is low, and the lithium dendrites and dead crystals that cause the battery impedance and safety problems to rise, etc. are compared with the traditional liquid electrolyte lithium metal battery, high-performance lithium metal battery The rapid development of China is subject to these limitations. Recently, relying on the construction of Qingdao Biodynamics and Processes of the Chinese Academy of Sciences, the Qingdao Energy Storage Industry Skills Seminar Institute (hereinafter referred to as Qingdao Storage Court) has dealt with key bottlenecks. Lithium batteries and polymer electrolytes are used as entry points to explore the core from three aspects. System treatment methods: (a) maintenance of large anion lithium lithium anode; (2) construction of artificial organic/inorganic composite interface membrane (SEI); (3) overall development of multifunctional polymer electrolytes for high-voltage resistance and lithium anode maintenance, and development A series of innovative research work has promoted the development of high-performance lithium metal batteries and played an important role in promoting and leading. In order to solve the problem of lithium dendrites from the perspective of lithium salts, researchers from Qingdao Energy Storage Research Institute planned to synthesize a new type of perfluoro-tert-butyl trifluoroborate (LiTFPFB) with a large anion structure. On the other hand, the presence of large negative ions can form a lithium anode maintenance film in situ and improve the electrochemical performance of lithium metal batteries. It is found that the ionic conductivity of lithium salt is significantly higher than LiBF4, and the aluminum collector fluid has better stability, and can form a layer of metal lithium negative electrode maintenance film useful to further inhibit the reaction between lithium metal and electrolyte in order to maintain the lithium negative electrode is useful. The relevant results were published in the world magazine 'Chemistry' in the form of a back cover article. Science. (Chem. Sci. 200893451-3458). The use of lithium metal-SEI is unsafe, and serious adverse events lead to low Coulomb force and short-term life unfavorable factors. For example, the workshop personnel started from the point of view of polymer interface modification and planned manual SEI to effectively maintain the metal lithium anode (Figure 1), Lithium oxide derivatives dispersed by Poly cyanoacrylate SEI film (Chemistry. Die. 29th, 2017, 4682-4689). It is found that the synergistic effect of the organic/inorganic layer enables the rapid development of lithium ions at the interface, while ensuring that the SEI is not easy to fall off, and significantly prevents side reactions from occurring in the interface area (Chem.Mater, 2016, 28 years old, 3578-3606), thereby making metallic lithium Battery stability and long-term stability (Chem. Mater excellent interface., 2008, 4039-4047). A series of related seminars are sponsored by the National Natural Science Foundation of my country’s Outstanding Youth Science Fund, the National Key Research and Development Project, the Nano Pilot Project of the Chinese Academy of Sciences, the Natural Science Foundation of Shandong Province, the Qingdao Energy Storage Industry Research Think Tank Joint Fund, and the 135th of Qingdao Institute of Technology Project dynamics. Disclaimer: Some pictures and content of articles published on this site are from the Internet. If there is any infringement, please contact to delete. Previous post: The difference between lithium battery, lithium battery and lithium polymer battery