Reference electrolyte capable of improving cycling performance of lithium-sulfur battery and preparation method
A technology of benchmark electrolyte and cycle performance, applied in the field of electrolyte preparation, can solve the problems of cumbersome design method, troublesome cathode synthesis, etc., and achieve the effect of good anode lithium protection effect, material saving and low price.
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[0015] A method for preparing a benchmark electrolyte that can improve the cycle performance of lithium-sulfur batteries, comprising the steps of:
[0016] Step 1: Under the condition that the interior of the glove box is in an argon atmosphere, and the internal water and oxygen content value does not exceed the standard, take two solvents and mix them evenly to make an ether solvent; the water content value is less than 1ppm, and the oxygen content value is less than 1ppm;
[0017] Step 2: Take the lithium salt, slowly add the lithium salt into the ether solvent described in step 1, and mix evenly to make a mixed solution; the molar concentration of the lithium salt is 0.8-1.5mol / L;
[0018] Step 3: Take lithium nitrate, and slowly add lithium nitrate into the mixed solution described in step 2 to make a semi-finished electrolyte, the mass fraction of lithium nitrate in the semi-finished electrolyte is 0.1% to 3%;
[0019] Step 4: Take the additive for improving cycle perfor...
Embodiment 1
[0022] A benchmark electrolyte that can improve the cycle performance of lithium-sulfur batteries, including ether solvents, lithium salts, lithium nitrate, and additives for improving cycle performance; the ether solvent is a mixture of two solvents, and the first solvent is: 1,3-Dioxane, the second solvent is: ethylene glycol dimethyl ether; the lithium salt is LiTFSi; the additive for improving cycle performance is 3-aminopropyltriethoxysilane.
[0023] A method for preparing a benchmark electrolyte that can improve the cycle performance of lithium-sulfur batteries, comprising the steps of:
[0024] Step 1: Under the condition that the inside of the glove box is in an argon atmosphere, and the water and oxygen content inside does not exceed the standard, take 1,3-dioxane and ethylene glycol dimethyl ether and mix them uniformly to make an ether solvent; The water content value is less than 1ppm, and the oxygen content value is less than 1ppm;
[0025] Step 2: Take LiTFSi, ...
Embodiment 2
[0029] A benchmark electrolyte that can improve the cycle performance of lithium-sulfur batteries, the benchmark electrolyte includes ether solvents, lithium salts, lithium nitrate and additives for improving cycle performance; the ether solvent is a mixture of two solvents, the first The first solvent is: 1,4-dioxane, the second solvent is: diethylene glycol dimethyl ether; the lithium salt is LiFSi; the additive for improving cycle performance is hexamethyldisilane.
[0030] A method for preparing a benchmark electrolyte that can improve the cycle performance of lithium-sulfur batteries, comprising the steps of:
[0031] Step 1: Under the condition that the inside of the glove box is in an argon atmosphere, and the water and oxygen content inside does not exceed the standard, mix 1,4-dioxane and diethylene glycol dimethyl ether evenly to make an ether solvent ; The water content value is less than 1ppm, and the oxygen content value is less than 1ppm;
[0032] Step 2: Take L...
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