Electrolyte for lithium battery and lithium titanate battery
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An electrolyte and lithium battery technology, applied in secondary batteries, organic electrolytes, non-aqueous electrolytes, etc., can solve problems such as easy flatulence, achieve the effects of reducing battery flatulence, preventing irreversible changes, and preventing continued decomposition
Pending Publication Date: 2021-04-09
YINLONG ENERGY CO LTD
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[0005] The main purpose of the present invention is to provide an electrolyte solution for a lithium battery and a lithium titanate battery to solve the problem that the lithium titanate negative electrode in the prior art is prone to flatulence due to high temperature
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Embodiment 1
[0046] Based on the total weight of organic solvents and additives, the content of organic solvents is 93% (18.5% ethylene carbonate, 34.2% ethyl methyl carbonate, 25.4% diethyl carbonate, 13.3% 1,3-propane sultone and 1.6 % vinylene carbonate five organic solvents mixed); the content of lithium hexafluorophosphate is 1.1mol / L; the content of additives is 7% (3.5% of methyl benzyl alcohol oxalate diester, 3.5% of carbonate polymer containing silyl groups). Carbonate polymer substances containing silyl groups are
[0047] where R 1 , R 2 , R 3 and R 4 Both are methyl groups, R 5 for-OCH 3 , R 6 is a ethylene carbonate residue, n=1, m=1.
Embodiment 2
[0049] Based on the total weight of organic solvents and additives, the content of organic solvents is 95% (19.5% ethylene carbonate, 35.2% ethyl methyl carbonate, 25.4% diethyl carbonate, 13.3% 1,3-propane sultone and 1.6 % vinylene carbonate five organic solvents mixed); the content of lithium hexafluorophosphate is 1.1mol / L; the content of additives is 5% (2.5% of methyl benzyl alcohol oxalate diester, 2.5% of carbonate polymer containing silyl groups). Carbonate polymer substances containing silyl groups are
[0050] where R 1 , R 2 , R 3 and R 4 Both are ethyl groups, R 5 for-OCH 3 , R 6 is a propylene carbonate residue, n=2, m=2.
Embodiment 3
[0052] Based on the total weight of organic solvents and additives, the content of organic solvents is 95% (19.5% ethylene carbonate, 35.2% ethyl methyl carbonate, 25.4% diethyl carbonate, 13.3% 1,3-propane sultone and 1.6 %vinylene carbonate five organic solvents mixed); the content of lithium hexafluorophosphate is 1.1mol / L; the content of additives is 5% (methyl benzyl alcohol oxalate diester 5%).
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Abstract
The invention provides an electrolyte for a lithium battery and a lithium titanate battery. The electrolyte for the lithium battery comprises a lithium salt, an organic solvent and an additive, the additive comprises a heat-sensitive sensing organic compound, and the weight percentage of the heat-sensitive sensing organic compound is 1-10% based on the total weight of the organic solvent and the additive. The heat-sensitive sensing organic compound is added into the electrolyte, the heat-sensitive sensing organic compound is dissolved in the organic solvent, when the temperature rises to a certain threshold value, a thin film is formed on the surface of an electrode, the resistance of the thin film is suddenly increased by 2-5 orders of magnitudes, the surface of the electrode becomes an insulator instantly, electrons are prevented from passing, the structure of active substances inside the battery is prevented from continuously generating irreversible changes, and the continuous decomposition of the electrolyte is prevented so as to prevent the battery from continuously generating gas and heat, such that the risk of battery gas expansion, fire or explosion can be effectively reduced.
Description
technical field [0001] The invention relates to the technical field of lithium battery materials, in particular to an electrolyte solution for a lithium battery and a lithium titanate battery. Background technique [0002] At present, most commercial lithium-ion battery anode materials are lithium-intercalated carbon materials. Since the potential of the carbon electrode after lithium intercalation is very close to that of metal lithium, when the battery is in use, the surface of the carbon electrode is easy to precipitate metal lithium. Liquid reaction produces a flammable gas mixture, so lithium-intercalated carbon materials are restricted by safety issues in the use of power lithium-ion batteries. At the same time, during the Li intercalation or extraction process, the carbon material with a 2D layered structure undergoes a shrinkage change, with a volume change rate of about 10%, which seriously affects the cycle stability of the battery. Therefore, it is necessary to f...
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