High-safety organic electrolyte, secondary battery, preparation method and application
An organic electrolyte and secondary battery technology, applied in the manufacture of electrolyte batteries, secondary batteries, non-aqueous electrolyte batteries, etc., can solve the problems of poor battery rate characteristics, poor flame retardancy, and high cost, and achieve good charge and discharge performance , stable Coulombic efficiency, and low manufacturing cost
Active Publication Date: 2019-05-21
浙江钠创新能源有限公司
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AI Technical Summary
Problems solved by technology
[0005] The actual technical problem to be solved in the present invention is to overcome the poor flame retardancy of the electrolyte used in the lithium / sodium secondary battery in the prior art, which easily causes the battery to catch fire, and the cost of the high-concentration salt phosphate electrolyte is high, the viscosity is large, Low electrical conductivity eventually leads to defects such as poor rate characteristics of the battery, providing a high-safety organic electrolyte, secondary battery, preparation method and application
Method used
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Effect test
Embodiment 1
[0044] After mixing anhydrous trimethyl phosphate and 1,1,2,2-tetrafluoroethyl-2,2,3,3-tetrafluoropropyl ether in a volume ratio of 1:2, add difluorosulfonyl Lithium imide was prepared into a 1.5mol / L electrolyte, and all operations were performed in a glove box filled with argon.
Embodiment 2
[0046] After mixing anhydrous triethyl phosphate and 1,1,2,2-tetrafluoroethyl-2,2,3,3-tetrafluoropropyl ether at a volume ratio of 2:3, add difluorosulfone Lithium imide was prepared into a 2mol / L electrolyte, and all operations were performed in a glove box filled with argon.
Embodiment 3
[0048] After mixing anhydrous trimethyl phosphate and 1,1,2,2-tetrafluoroethyl-2,2,2 trifluoroethyl ether in a volume ratio of 1:1, add bistrifluoromethylsulfonyl Lithium imide was prepared into a 2mol / L electrolyte, and all operations were performed in a glove box filled with argon.
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The invention discloses a high-safety organic electrolyte, a secondary battery, a preparation method and an application. The organic electrolyte comprises salt, phosphate and fluoro-ether and does notinclude carbonic ester; the salt is lithium salt or sodium salt; the structural formula of the phosphate is shown in a formula (1) or a formula (2); the structural formula of the fluoro-ether is shown in a formula (3), the volume of the phosphate is 20-65% of the volume of the organic electrolyte, the concentration of the lithium salt relative to the phosphate is greater than or equal to 3. 5 mol / L; and the concentration of the sodium salt relative to the phosphate is greater than or equal to 3 mol / L. According to the high-safety organic electrolyte disclosed by the invention, the non-inflammability is achieved, the high-safety organic electrolyte has good compatibility and wettability with an electrode material and a PP / PE diaphragm, the secondary battery obtained by using the organic electrolyte has high safety and good charging and discharging performance, the coulombic efficiency is high and stable, and the manufacturing cost is low. Formula (1), formula (2) and formula (3).
Description
technical field [0001] The invention relates to a high-safety organic electrolyte, a secondary battery, a preparation method and an application. Background technique [0002] Secondary batteries, especially lithium-ion batteries, are widely used in the 3C market, new energy vehicles and smart grid energy storage markets. In addition to improving the energy density of batteries, the safety of batteries is particularly important in the development of batteries. Generally, commercial lithium-ion batteries use traditional carbonate-based electrolytes, which are highly flammable. When the batteries are improperly used or subjected to external collisions and other factors, it is easy to cause safety problems such as battery fire and explosion. As an emerging secondary battery, sodium-ion batteries have potential application advantages in large-scale energy storage and low-speed electric vehicles. At present, the electrolytes developed for sodium-ion batteries mostly use carbonate ...
Claims
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IPC IPC(8): H01M10/0569H01M10/058H01M10/0525H01M10/054
CPCY02E60/10Y02P70/50
Inventor 车海英马紫峰
Owner 浙江钠创新能源有限公司