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Electrolyte

An electrolyte and organic solvent technology, applied in the field of electrolyte, can solve problems such as poor cycle performance and rate performance, achieve stable performance, improve compatibility, and broaden the effect of temperature adaptation characteristics

Inactive Publication Date: 2011-09-14
BEIJING INSTITUTE OF TECHNOLOGYGY
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Aiming at the defect that the current lithium secondary battery electrolyte cannot form a stable solid electrolyte phase interface film, which leads to poor cycle performance and rate performance of the lithium secondary battery, one of the purposes of the present invention is to provide an electrolyte solution, which is mainly used for For lithium secondary batteries, the proportion of components is reasonable, and an effective, dense and stable solid electrolyte phase interface film can be formed on the surface of graphite electrode materials, which improves the compatibility between the electrolyte and electrode materials, and at the same time through the electrolyte group The distribution ratio optimization broadens the temperature adaptability of the electrolyte material, which can effectively improve the cycle performance, rate performance and temperature adaptability of the lithium secondary battery using the electrolyte of the present invention

Method used

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Examples

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Effect test

Embodiment 1

[0057] An electrolytic solution, wherein the components of organic solvent and additive and their mass percentages are respectively: 20% ethylene carbonate, 50% ethyl methyl carbonate, 30% butenyl sulfite, lithium difluorooxalate borate (LiODFB) in The concentration of the substances in the electrolyte is 1mol / L; under the protection of argon, the electrolyte for testing is prepared in the glove box according to the above ratio.

[0058] Assemble 10 sets of button batteries, and carry out charge and discharge tests on the 10 sets of button batteries at a current density of 0.1C through a blue electric battery test system at room temperature. After 10 weeks of testing, the button battery has an average capacity of 354mAh / g.

[0059] In addition, 10 sets of button batteries were assembled, and the charge and discharge tests were carried out on the 10 sets of button batteries at a current density of 0.1C by a blue battery test system under low temperature conditions (-20°C). Aft...

Embodiment 2

[0061] An electrolytic solution, wherein the components of the organic solvent and additives and their mass percentages are respectively: 30% ethylene carbonate, 69.5% dimethyl carbonate, 0.5% propylene sulfite, lithium diacetate borate (LiBOB) in the electrolytic solution The concentration of the substances in the solution is 0.6mol / L; under the protection of argon, the electrolyte solution for testing is prepared in the glove box according to the above ratio.

[0062] Assemble 10 sets of button batteries, and carry out charge and discharge tests on the 10 sets of button batteries at a current density of 0.1C through a blue electric battery test system at room temperature. After 10 weeks of testing, the button battery has an average capacity of 243mAh / g.

[0063] In addition, 10 sets of button batteries were assembled, and the charge and discharge tests were carried out on the 10 sets of button batteries at a current density of 0.1C by a blue battery test system under low tem...

Embodiment 3

[0065] An electrolytic solution, wherein the organic solvent and additive components and their mass percentages are: 25% ethylene carbonate, 55% diethyl carbonate, 20% vinyl sulfite, lithium perfluoroalkylsulfonimide (Li(CF 3 SO 2 ) 2 N) The concentration of the substances in the electrolyte is 1mol / L; under the protection of argon, the electrolyte solution for testing is prepared in the glove box according to the above ratio.

[0066] Assemble 10 sets of button batteries, and carry out charge and discharge tests on the 10 sets of button batteries at a current density of 0.1C through a blue electric battery test system at room temperature. After 10 weeks of testing, the average capacity of the button cell was 287mAh / g.

[0067] In addition, 10 sets of button batteries were assembled, and the charge and discharge tests were carried out on the 10 sets of button batteries at a current density of 0.1C by a blue battery test system under low temperature conditions (-20°C). Afte...

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Abstract

The invention relates to electrolyte, belonging to the technical field of material chemistry and high energy batteries. The electrolyte consists of an organic solvent, an additive and lithium salt, wherein the organic solvent is one or a mixture of ethylene carbonate, ethyl methyl carbonate, methyl-carbonate or diethyl carbonate; the additive is sulfurous ester; and the lithium salt is selected from lithium perchlorate, lithium hexafluorophosphate, lithium tetrafluoroborate, perfluoroalkyl lithium sulfonate, perfluoroalkyl sulfoacid imide lithium, annular perfluoroalkyl di(sulfonyl)lithium imide, perfluoroalkyl acyl sulfonate lithium methide, organic boric acid ester lithium, organic lithium phosphate or organic aluminic acid ester lithium. Due to the adoption of the electrolyte, a layer of stable solid electrolyte phase boundary face film can be formed on the surface of a graphite electrode, the compatibility between the electrolyte and an electrode material is improved, the temperature suitability of the electrolyte material is expanded through proportion optimization, and the cycle performance, rate capability and temperature suitability of a lithium secondary battery using the electrolyte can be effectively improved.

Description

technical field [0001] The invention relates to an electrolytic solution. Specifically, the electrolytic solution is mainly used in lithium secondary batteries and belongs to the technical fields of material chemistry and high-energy batteries. Background technique [0002] Lithium secondary battery is a new type of chemical power source, which is widely used in portable electronic products such as mobile phones because of its characteristics of high energy density, high working voltage, long life and no environmental pollution. [0003] Lithium secondary battery electrolyte is an important part of lithium secondary battery. and safety performance are of paramount importance. Lithium secondary battery electrolyte is generally composed of high-purity organic solvent, electrolyte lithium salt and necessary additives. The solvent composed of high-purity organic solvents and necessary additives is generally composed of high dielectric constant organic solvents, low-viscosity o...

Claims

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Application Information

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IPC IPC(8): H01M10/0569H01M10/0567
CPCY02E60/12Y02E60/10
Inventor 陈人杰吴锋何舟影李丽陈实
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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