Nitroso grafted carbonate electrolyte of lithium battery and preparation method

A nitroso, electrolyte technology, applied in the manufacture of electrolyte batteries, secondary batteries, non-aqueous electrolyte batteries, etc., can solve the problems of unsolved dielectric constant and viscosity of electrolyte solvents, improve antioxidant performance, reduce Binding energy, overall viscosity reduction effect

Active Publication Date: 2018-02-16
江苏思派新能源科技有限公司
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AI-Extracted Technical Summary

Problems solved by technology

The preparation method of the electrolyte is as follows: add metal lithium or Li2S and elemental sulfur into an organic solvent in a molar ratio, react at room temperature and under the protection of an inert atmosphere to obtain an electrolyte, and lithium salt can be selectively added to the electrolyte , shuttle inhibitors, etc.; also discloses a Li-S battery comprising the aforementioned electrolyte, its negative electrode active material is metal lithium or a lithium-containing alloy; its positive electrode active material is sulfur simple substance, organic sulfide, carbon-sulfur polymer At least one, and the positive electrode active material, conductive agent and binder form the positive electrode according to a certain mass ratio; wherein each mg of sulfur corresponds to an electrolyte consumption of about 0.04mL;...
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Abstract

The invention discloses a nitroso grafted carbonate electrolyte of a lithium battery and a preparation method. By performing mixed treatment on ethylene carbonate and propylene carbonate through nitrite, adding a small amount of fluoroethers and borate as auxiliaries simultaneously, heating at a low temperature (40-50 DEG C) in a water bath and rapidly stirring, and adjusting pH to be weakly alkaline simultaneously, NO2- obtained after nitrite ions are decomposed is additionally reacted with alkyl alkenyl and carbonyl groups of the ethylene carbonate and the propylene carbonate, the antioxidant properties of carbonate are improved by the combined action of the fluoroethers and nitroso groups, meanwhile, the grafting of small molecular groups can reduce the overall viscosity of a liquid, and a part of nitrogen atoms enter a carbon chain in a substitutional manner to cause structural defects and reduce the combined energy of the nitroso groups.

Application Domain

Final product manufactureElectrolyte accumulators manufacture

Technology Topic

Nitrite ionOxidation resistant +13

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  • Nitroso grafted carbonate electrolyte of lithium battery and preparation method
  • Nitroso grafted carbonate electrolyte of lithium battery and preparation method

Examples

  • Experimental program(6)
  • Comparison scheme(6)

Example Embodiment

[0026] Example 1
[0027] A nitroso-grafted carbonate electrolyte for a lithium battery and a preparation method thereof, wherein lithium nitrite is mixed with ethylene carbonate and propylene carbonate, wherein the mixing ratio of ethylene carbonate and propylene carbonate is 1:0.5, At the same time, fluorinated ethers and borate are added as auxiliary agents. The ratio of fluorinated ethers and borate is 1:0.3 to form an electrolyte. The mole fraction of lithium nitrite in the electrolyte formed by the mixed solution is 0.435 is NO 2 - The mole fraction of ethylene carbonate is 0.435, the mole fraction of ethylene carbonate is 0.29, and the mole fraction of propylene carbonate is 0.145; that is, the mole fraction of ethylene carbonate is + the mole fraction of propylene carbonate is 0.435, and the mole fraction of alkenyl and carbonyl The sum of the scores is 0.87, which is NO 2 - The ratio of mole fraction of alkenyl to the sum of the mole fraction of alkenyl and carbonyl is 1:2; the mole fraction of fluoroethers is 0.1, and the mole fraction of borate is 0.03; heated in a water bath at a low temperature of 40 °C Stir quickly; adjust the pH value to 7.5 during heating in a water bath to decompose NO after nitrite ion 2 - Addition with the alkylalkenyl and carbonyl groups of ethylene carbonate and propylene carbonate; keep the reaction time for 15 minutes to complete the preparation of the electrolyte; measure the electrolyte anti-oxidation time T1 and electrolyte viscosity D1, and record them in Table 2.

Example Embodiment

[0028] Example 2
[0029] A nitroso-grafted carbonate electrolyte for a lithium battery and a preparation method, wherein lithium nitrite is mixed with ethylene carbonate and propylene carbonate, wherein the mixing ratio of ethylene carbonate and propylene carbonate is 1:1, At the same time, fluorinated ethers and borate are added as auxiliary agents. The ratio of fluorinated ethers and borate is 1:0.3 to form an electrolyte. The mole fraction of lithium nitrite in the electrolyte formed by the mixed solution is 0.493 is NO 2 - The mole fraction of ethylene carbonate is 0.493, the mole fraction of ethylene carbonate is 0.125, and the mole fraction of propylene carbonate is 0.125; that is, the mole fraction of ethylene carbonate is + the mole fraction of propylene carbonate is 0.25, and the mole fraction of alkenyl and carbonyl The sum of the scores is 0.5, which is NO 2 - The ratio of mole fraction to the sum of the mole fractions of alkenyl and carbonyl groups is 1:1; the mole fraction of fluoroethers is 0.2, and the mole fraction of borate is 0.06; heated in a water bath at a low temperature of 45 °C Stir quickly; adjust the pH value to 8.1 in the process of heating in a water bath to decompose NO after nitrite ion 2 - Addition with the alkylalkenyl and carbonyl groups of ethylene carbonate and propylene carbonate; keep the reaction time for 30 minutes to complete the preparation of the electrolyte; measure the electrolyte anti-oxidation time T2 and electrolyte viscosity D2, and record them in Table 2.

Example Embodiment

[0030] Example 3
[0031] A nitroso-grafted carbonate electrolyte for a lithium battery and a preparation method, comprising the steps of mixing lithium nitrite with ethylene carbonate, adding fluoroethers and borate as auxiliary agents, fluoroethers and boron The ratio of acid salt is 1:0.3 to form an electrolyte, and the mole fraction of lithium nitrite in the electrolyte formed by the mixed solution is 0.435, namely NO 2 - The mole fraction of ethylene carbonate is 0.435 and the mole fraction of ethylene carbonate is 0.435; that is, the mole fraction of ethylene carbonate is + the mole fraction of propylene carbonate is 0.435, and the sum of the mole fractions of alkenyl and carbonyl is 0.87, that is, NO 2 - The ratio of mole fraction of alkenyl to the sum of the mole fraction of alkenyl and carbonyl is 1:2; the mole fraction of fluoroethers is 0.1, and the mole fraction of borate is 0.03; heated in a water bath at a low temperature of 40 °C Stir quickly; adjust the pH value to 7.5 during heating in a water bath to decompose NO after nitrite ion 2 - Addition with the alkylalkenyl and carbonyl groups of ethylene carbonate and propylene carbonate; keep the reaction time for 30 minutes to complete the preparation of the electrolyte; measure the electrolyte anti-oxidation time T3 and electrolyte viscosity D3, and record them in Table 2.

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