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High-power lithium ion battery electrolyte

A lithium-ion battery, electrolyte technology, applied in the direction of secondary batteries, circuits, electrical components, etc., can solve the deterioration of lithium-ion battery rate performance, lithium-ion batteries can not be well used in the field of power batteries, cycle performance decline, etc. problems, to achieve excellent rate performance and cycle performance, prevent gas swelling, and improve the effect of capacity

Inactive Publication Date: 2012-11-07
新乡市盛林能源有限公司
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AI Technical Summary

Problems solved by technology

[0004] The solvents contained in most of the lithium-ion battery electrolytes currently on the market cannot form a stable solid electrolyte phase interface film well. The surface of the electrode material is decomposed and the graphite layer is peeled off, which leads to the deterioration of the rate performance and the gradual decline of the cycle performance of the lithium-ion battery.
The above problems lead to lithium-ion batteries not being well applied in the field of power batteries

Method used

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Experimental program
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Effect test

Embodiment 1

[0038] The composition of the electrolyte is as follows: based on the total mass of the organic solvent and additives as 100%, the mass fractions of non-aqueous organic solvents: ethylene carbonate, dimethyl carbonate, and propylene carbonate are: 25%, 18%, and 35% respectively , additives perfluorinated vinyl sulfite derivatives, ethylene carbonate, and cyclic carboxylate-butyrolactone mass fractions are: 11%, 3%, and 8%, respectively, and electrolyte salts are lithium hexafluorophosphate and difluorooxalate boric acid The mass fractions of lithium are 60% and 40%, respectively, and the molar concentration in the electrolyte is 1 mol / L. Add this electrolyte to make 18650 battery. Test the electrical properties of the battery at 1 C, 5 C, 10 C and 15 C rates. The cut-off capacities are 1456 mAh, 1404 mAh, 1447 mAh and 1473 mAh respectively. See figure 1 ; Among them, at 10 C rate, the capacity after 400 cycles is 1398 mAh, and the capacity retention rate is 96%, see figure 2...

Embodiment 2

[0040]The composition of the electrolyte is as follows: based on the total mass of the organic solvent and additives as 100%, the mass fractions of non-aqueous organic solvents: ethylene carbonate, dimethyl carbonate, and propylene carbonate are: 28%, 16%, and 34% respectively , the mass fractions of additives perfluorinated vinyl sulfite derivatives, ethylene carbonate, and cyclic carboxylate-butyrolactone are 9%, 6%, and 7%, respectively, and the electrolyte salts are lithium hexafluorophosphate and lithium diacetate borate , the mass fractions are 70% and 30% respectively, and the molar concentration in the electrolyte is 1 mol / L. Add the electrolyte to make a 18650 battery and test the battery at 1 C, 5 C, 10 C and 15 C. Electrical properties, the cut-off capacities are 1463 mAh, 1402 mAh, 1441 mAh and 1469 mAh respectively; under 10 C rate, the capacity of 400 cycles remains at 1396 mAh, and the capacity retention rate is 95%.

Embodiment 3

[0042] The composition of the electrolyte is as follows: based on the total mass of organic solvent and additives as 100%, the mass fractions of non-aqueous organic solvents: ethylene carbonate, dimethyl carbonate, and propylene carbonate are: 15%, 5%, and 30% respectively , the mass fractions of additives perfluorinated vinyl sulfite derivatives, ethylene carbonate, and cyclic carboxylate-butyrolactone are 20%, 7.5%, and 22.5%, respectively, and the electrolyte salts are lithium hexafluorophosphate and difluorooxalate boric acid The mixture of lithium and lithium diacetate borate, the mass fractions are 90%, 5%, and 5%, respectively, and the molar concentration in the electrolyte is 0.6mol / L. Add this electrolyte to make a 18650 battery. Test the battery at 1 C, The electrical properties at 5 C, 10 C and 15 C rates, the cut-off capacities are 1430 mAh, 1371 mAh, 1350 mAh and 1326 mAh respectively; at 10 C rate, the 400-cycle capacity remains at 1293 mAh, and the capacity reten...

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Abstract

The invention discloses a high-power lithium ion battery electrolyte. A technical scheme provided by the invention has the following main points: the high-power lithium ion battery electrolyte comprises an electrolyte salt, a non-aqueous organic solvent and an additive; the electrolyte salt is selected from the group consisting of lithium hexafluorophosphate with lithium bis(oxalate)borate, lithium difluoroborate and a mixture thereof; the non-aqueous organic solvent is a mixture of ethylene carbonate, dimethyl carbonate and propylene carbonate; and the additive is a mixture of perfluorinated glycol sulfite derivative, ethylene carbonate and cyclic carboxylic ester-butyrolactone. The high-power lithium ion battery electrolyte can well support a high-power power battery for charging and discharging with large current; the lithium ion battery prepared by using the electrolyte has excellent rate capability and cycle performance, and can effectively prevent inflation of a battery using a ternary high nickel material.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to a high-power lithium ion battery electrolyte. Background technique [0002] In recent years, global energy and resources have become increasingly tense, and environmental pollution problems have become increasingly prominent. All countries are vigorously developing new energy industries. At present, the gradual replacement of fuel vehicles by electric vehicles is an inevitable trend of social development. Therefore, the research and development of efficient, convenient, safe and pollution-free new energy sources has become a hot topic in today's social research. As a new type of secondary battery, lithium-ion battery has many advantages such as high energy density and power density, no memory effect, high working voltage, good cycle performance, strong load capacity, good safety performance and no environmental pollution. It has broad application prospects in many ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0567H01M10/0568H01M10/0569
CPCY02E60/12Y02E60/10
Inventor 王明强杨勇王海丽
Owner 新乡市盛林能源有限公司
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