Tesla and intensify cooperation r&d without anode for lithium battery remains 80% capacity after 90 cycles

According to foreign media reports, although the lithium ion battery there is room for improvement, but the most people think that solid-state batteries would be preferred in the next generation of batteries. Polysilicon cutting machine now, tesla's battery research partners announced a way for lithium ion batteries have higher energy density method, can let you will no longer research mainly focus on solid-state batteries. In the process of discharge, lithium ion from the collector, direct access to the cathode. In addition, compared with the single salt electrolyte complexes, double salt electrolyte complexes perform better under different voltage, and don't rely too much on the external pressure, can achieve good cycle performance.

the researchers said, feeling weak current industry saturated their findings could people study focus from solid-state batteries ( 单边带) Transfer to the rechargeable, high energy density batteries. As the package of the lithium metal anode by close to 50 microns in diameter of lithium, even after 50 cycles, also won't dendrite growth. But, if you use a liquid electrolyte to produce safe, free domestic project management long life of lithium batteries, the existing production equipment can quickly achieve the commercialization of high energy density batteries. And in the absence of anode cells, this kind of cycle performance will be particularly with low efficiency, bare copper anode was used to construct directly because of this kind of battery, the charging cycles in the first time, lithium will directly at the cathode deposition. In addition, there is a kind of method is to use solid electrolyte and solid electrolyte, however, does not completely eliminate the lithium dendrite problem successfully, and it is unclear whether the technology compatible with the existing lithium-ion battery production equipment, and now on lithium-ion battery production equipment has reached billions of dollars of investment. But only lithium metal anode, super thick, can significantly increase the energy density, but cannot be used in practical very thick plate, therefore, the researchers say need to limit the thickness of the lithium metal anode to 50 microns. Dalhousie university in Canada, 达尔豪斯大学) The team led by Jeff Dahn professor, and tesla r&d center colleagues in Canada, as well as the university of Waterloo in Canada ( 滑铁卢大学) Cooperation, shows the use double salt electrolyte ( Fluorinated ethylene carbonate ( FEC） : ethylene carbonate ( 12月) In the solution containing 1 m 2 fluorine boric acid lithium LiDFOB oxalate and 0. 2 m four LiBF4 fluoboric acid lithium) No anode made of lithium battery. Treatment of the east hope group limited lithium overdose is a huge challenge, because of its easy formation on the surface of metallic lithium dendrite, can increase the reactivity of anode and electrolyte, isolation metal lithium, leading to cell cycle efficiency is low. In this study, the researchers adopted LiDFOB and LiBF4 electrolyte, let the existing without anode cell cycle to achieve the longest service life, after a 90 - cycle, can still keep 80% of capacity. In order to improve the cycle stability of liquid electrolyte, people took many different ways, such as high salt concentration of electrolyte, ethers solvent, fluoride compounds, electrolyte additive, the surface of the anode coating and external pressure, etc. Use the lithium metal instead of the traditional graphite anode is to improve the lithium ion battery energy density is one of the most popular method, can be 40% to 50% will increase the energy density of batteries. As there is no excess lithium battery, battery volume to minimize, maximize the energy density, but the performance may be very bad, feel weak current industry saturated because lithium is not stored in the cycle to continue to supply the cells with energy. In the new batteries, lithium ion will be extracted from the battery cathode, in charge for the first time, lithium ion deposition in the form of metallic lithium on the collector ( Cu） 。