Lithium battery electrolyte, lithium battery and preparation method of lithium battery
An electrolyte and lithium battery technology, applied in the field of lithium-ion batteries, can solve the problems of reduced ion conductivity, failure to apply to lithium batteries, increased viscosity, etc., to achieve the effects of corrosion inhibition, excellent battery performance, and reduced viscosity
Inactive Publication Date: 2021-01-29
HUAZHONG UNIV OF SCI & TECH
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Problems solved by technology
[0003] Aiming at the above defects or improvement needs of the prior art, the present invention provides a lithium battery electrolyte, a lithium battery and a preparation method for a lithium battery, the purpose of which is to solve the problem of lithium battery electrolyte by improving the formulation of the lithium battery electrolyte. The viscosity will increase significantly at low temperature, and the ionic conductivity will decrease significantly, so it cannot be applied to lithium batteries to achieve the technical problem of working under extremely low temperature conditions
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Embodiment 1
[0031] Take a portion of triethyl phosphate with a volume of 1 mL, add 0.3741 g of lithium bis(fluorosulfonyl)imide, and then add fluoroethylene carbonate with a volume of 100 μL, and mix well to obtain an electrolyte solution. The concentration of lithium bis(fluorosulfonyl)imide in the medium is 2mol / L.
Embodiment 2
[0033] Take a portion of triethyl phosphate with a volume of 1 mL, add 0.3741 g of lithium bis(fluorosulfonyl)imide, and then add fluoroethylene carbonate with a volume of 100 μL, and mix well to obtain an electrolyte solution. The concentration of lithium bis(fluorosulfonyl)imide in the medium is 2mol / L.
Embodiment 3
[0035] Take a portion of triethyl phosphate with a volume of 1 mL, add 0.3741 g of lithium bis(fluorosulfonyl)imide, and then add fluoroethylene carbonate with a volume of 300 μL, and mix well to obtain an electrolyte solution. The concentration of lithium bis(fluorosulfonyl)imide in the medium is 2mol / L.
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The invention belongs to the field of lithium ion batteries, and particularly relates to a lithium battery electrolyte, a lithium battery and a preparation method of the lithium battery. The electrolyte comprises an electrolyte lithium salt, an organic solvent and an additive, wherein the organic solvent is a phosphate organic solvent, a carboxylic ester organic solvent and/or a fluorocarboxylic ester organic solvent; and the concentration of the electrolyte lithium salt in the electrolyte is greater than or equal to 1 mol/L. A positive electrode material in the lithium battery is Prussian blue, and the electrolyte is adopted in the lithium battery. The high-concentration electrolyte provided by the invention can effectively inhibit the corrosion of electrolyte lithium salt to a current collector, still has relatively high ionic conductivity at -60 DEG C, and can meet the working requirements of an ultralow-temperature lithium ion battery. The lithium ion battery provided by the invention still has excellent discharge capacity and relatively high capacity retention ratio at ultralow temperature.
Description
technical field [0001] The invention belongs to the field of lithium ion batteries, and more specifically relates to a lithium battery electrolyte, a lithium battery and a preparation method for the lithium battery. Background technique [0002] Since the commercialization of lithium batteries in the 1990s, they have been used in all aspects of life and production because of their high energy density, low pollution, and long life. However, with the continuous development of the times, the higher performance requirements and wider application fields of batteries have gradually restricted the subsequent development of lithium batteries. At present, the viscosity of the lithium battery electrolyte used in the prior art will increase significantly when the temperature is below -20°C, the ionic conductivity will be greatly reduced, and even part of the electrolyte will solidify, which greatly limits the application of lithium batteries in low temperature environments. . The wor...
Claims
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IPC IPC(8): H01M10/0566H01M10/0567H01M10/0568H01M10/0569H01M10/42H01M10/0525
CPCH01M10/0566H01M10/0567H01M10/0568H01M10/0569H01M10/4235H01M10/0525H01M2300/0025H01M2300/0028Y02E60/10
Inventor 方淳邹雨茜韩建涛欧明洋王鑫
Owner HUAZHONG UNIV OF SCI & TECH
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