Nitroso grafted carbonate electrolyte of lithium battery and preparation method

[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.

[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.

[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.