Research progress of high energy density cobalt acid lithium batteries

Source: 2020 - 03 - On 23 purposes are: the research progress of high energy density lithium cobalt oxide battery with the rapid development of electric vehicles and mobile electronic devices, power of lithium ion battery energy density higher requirements are put forward. According to the principle of thrust, lithium ion battery energy density is close to its limit, therefore improve the space is small. , by contrast, lithium as negative electrode of metallic lithium battery has the incomparable superiority in improving the energy density. However, according to repeat SEI rupture and generation of challenge, expand the lithium anode volume, coulomb force is low, causing the battery impedance and security growth of crystal, lithium dendrite and death with traditional liquid electrolyte lithium battery, such as the rapid development of high performance lithium batteries by these restrictions. Recently, relying on the Chinese Academy of Sciences, Qingdao biodynamic and process for the construction of the Qingdao institute of energy storage industry skills seminar ( Hereinafter referred to as the 'Qingdao store court) Processing the key bottlenecks, lithium batteries, polymer electrolyte as a breakthrough point, from three aspects to explore the core system (treatment a) Large anion lithium lithium anode maintenance; ( 2) To build artificial organic/inorganic composite interface membrane ( SEI) ; ( 3) As a whole development for high pressure resistance and lithium anode maintenance of multi-functional polymer electrolyte, carrying out a series of innovative research work, promote the development of high-performance lithium batteries, played an important role in lead and lead. In order to solve from the perspective of lithium lithium dendrite problem, researchers of the Qingdao institute of energy storage planning a new kind of synthesis of large anion structure of perfluorinated three fluoboric acid salt (tert-butyl LiTFPFB) 。 On the other hand, the existence of large negative ions can be formed in situ lithium anode to maintain membrane, improve the electrochemical performance of lithium battery. Found that lithium ionic conductivity was significantly higher than that of LiBF4, and aluminum collector fluid has better stability, can form a layer of the maintenance of lithium metal anode film useful further inhibit reaction between lithium metal and the electrolyte, so as to maintain the lithium cathode is useful. Results in the form of back cover articles published in the magazine 'chemistry. Science. ( 化学。 Sci。 9, 3451-2008 3458). 。 And metal lithium - SEI in use are not safe, serious adverse events leading to the coulomb force is low, short cycle life of unfavorable factors, such as workshop staff, from the point of view of polymer interface modification start planning the artificial SEI useful maintenance lithium metal anode ( FIG. 1) By the poly cyanoacrylate SEI film dispersed lithium oxide derivatives ( Chemistry. Die. 29, 2017, 4682 - 4689). 。 Found that the synergistic effect of organic/inorganic layer interfaces quickly and lithium ion, while ensuring the SEI is not easy to fall off, and significantly prevent adverse events occurred in the region of the interface ( 化学。 Mater. , 2016, 28, 3578 - 3606). , so that the metal lithium battery stability and stable for a long period of time ( 化学。 Mater excellent interface. , 9-2008403 4047). 。 A series of related seminar is by the natural science foundation of China's national outstanding young science foundation, national key r&d projects, nano pilot project of the Chinese Academy of Sciences, shandong province natural science foundation of China, Qingdao energy storage industry research, a think-tank, mutual funds, and Qingdao institute of '135' project dynamic.