Composite solid electrolyte and manufacturing method thereof
A technology of solid electrolyte and manufacturing method, applied in the direction of electrolyte immobilization/gelation, circuit, electrical components, etc., can solve the problems of reducing the service life of electrolyte, poor electrochemical stability, poor air stability, etc., to improve energy Effect of density, low manufacturing cost, good mechanical properties
Active Publication Date: 2022-01-21
YANGTZE DELTA REGION INST OF UNIV OF ELECTRONICS SCI & TECH OF CHINE HUZHOU
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Problems solved by technology
Although sulfur-based solid electrolytes have high ionic conductivity at room temperature, their poor electrochemical stability limits their application in high-energy-density power batteries, and poor air stability makes them easy to react with water to generate H
2
S, reduce the service life of the electrolyte
Method used
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Embodiment 1
[0065] A method for manufacturing a composite solid electrolyte, comprising the following steps:
[0066] (1) Select the PVDF polymer with a mass percentage of 50%, 10% Li 2 W 2 o 7 Solid electrolyte powder, 40% LiTFSI, and select a certain quality solvent solution, such as NMP, calculated by mass ratio, controlled at 85% of the total mass of slurry (slurry includes polymer base material, additive, lithium salt), and Separate the solvent at a ratio of 2:10;
[0067] The Li 2 W 2 o 7 The preparation method of solid electrolyte powder comprises the following steps:
[0068] 1) 13.8% Li by mass 2 CO 3 , 86.2% WO 3 , stirred in isopropanol for 12 hours, then poured the solution into a ball mill tank for ball milling at a speed of 800r / min, 30 laps, to make it fully mixed to obtain a mixed material;
[0069] 2) Dry the mixed material prepared in step (1), grind the dried block into powder, put it evenly in the crucible, and burn it in the air at 750°C for 6 hours, and the...
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The invention discloses a composite solid electrolyte which comprises the following raw materials in percentage by mass: 5-90% of polymer base material, 5-50% of lithium salt and 5-90% of additive. The composite solid electrolyte is prepared through the steps of mixing, coating, drying, storing and the like. After the technical scheme of the invention is adopted, since the solid electrolyte is prepared from polyvinylidene fluoride, the preparation process is very simple and effective, and the compound solid electrolyte also has ionic conductivity, a high ionic transference number and a good mechanical property, cycle performance and a rate capability at a room temperature.
Description
technical field [0001] The invention belongs to the technical field of batteries, and relates to a composite solid electrolyte and a manufacturing method thereof. Background technique [0002] With the continuous development of new energy electric vehicles and portable electronic devices, lithium-ion batteries have become the first choice for commercial batteries, but the energy density of traditional liquid lithium-ion batteries is low, and the energy density of liquid lithium iron phosphate secondary batteries is only 150Wh / kg, it is difficult to meet the needs of new energy electric vehicles and portable electronic devices for high energy density secondary batteries. At the same time, the difficulty in ensuring the safety of liquid lithium-ion batteries is another important factor restricting the development of the new energy industry. Therefore, finding a higher energy density and safer secondary battery system is the key to the development of the new energy industry. ...
Claims
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IPC IPC(8): H01M10/0565H01M10/0525H01M10/42
CPCH01M10/0525H01M10/0565H01M10/4235H01M2300/0085Y02E60/10
Inventor 吕维强余远东王旭畅牛英华钟卓航
Owner YANGTZE DELTA REGION INST OF UNIV OF ELECTRONICS SCI & TECH OF CHINE HUZHOU