Non-aqueous electrolyte, preparation method of non-aqueous electrolyte and lithium ion secondary battery containing non-aqueous electrolyte

A non-aqueous electrolyte and electrolyte technology, applied in the direction of secondary batteries, circuits, electrical components, etc., can solve the problems of no commercial value, reduced battery life, high manufacturing costs, etc., to optimize the solid electrolyte interface film, flammability The effect of reducing and improving compatibility

Inactive Publication Date: 2012-06-27
IRICO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although organic fluorine compounds are electrochemically stable, their manufacturing costs are generally high, the life of the battery is significantly reduced, and they have no obvious commercial value

Method used

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  • Non-aqueous electrolyte, preparation method of non-aqueous electrolyte and lithium ion secondary battery containing non-aqueous electrolyte
  • Non-aqueous electrolyte, preparation method of non-aqueous electrolyte and lithium ion secondary battery containing non-aqueous electrolyte

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preparation example Construction

[0020] The preparation method of the electrolyte solution provided by the present invention is to mix the fluoride and the non-aqueous solvent in a certain proportion in a dry environment, then add the lithium salt into the above-mentioned non-aqueous solvent, heat and stir at 30-80°C to make The lithium salt is fully dissolved to make an electrolyte.

[0021] The lithium ion secondary battery provided by the present invention comprises a positive electrode, a negative electrode, a separator paper and an electrolyte, wherein the above-mentioned non-aqueous electrolyte is used as the electrolyte.

[0022] The positive electrode includes an active material, a conductive agent, a binder and a current collector. The positive active material includes LiCoO 2 , LiMnO 2 , LiNiO 2 、LiNi 1 / 3 mn 1 / 3 co 1 / 3 o 2 and lithium metal phosphate salts with an olivine structure: Li 1+a L b PO 4 ; In the formula, -0.1≤a≤0.2, 0.9≤b≤1.1, L is at least one of iron, aluminum, manganese, cob...

Embodiment 1

[0032] Choose a fluoride solvent with the following structure:

[0033] Compound A;

[0034] (1) Preparation of electrolyte

[0035] Prepare the electrolyte solution in an argon-filled glove box (H2O6 , making the concentration of LiPF6 reach 1mol / L.

[0036] (2) Preparation of positive electrode

[0037] Fully stir and mix LiFePO4, carbon black and polyvinylidene fluoride (PVDF) at a weight ratio of 94:3:3, and mix and stir the obtained mixture with N-methylpyrrolidone (NMP) at a weight ratio of 1:1.2 The positive electrode slurry was uniformly prepared. Use a coating machine to evenly coat the obtained positive electrode slurry on the aluminum foil current collector, dry at 130°C, cut and calender to obtain the positive electrode sheet, which contains 6 grams of LiFePO 4 .

[0038] (3) Preparation of negative electrode

[0039] Artificial graphite, SBR and CMC were mixed in a weight ratio of 96:2:2, and the obtained mixture was mixed with deionized water in a weight ...

Embodiment 2～5

[0045] Electrolyte and battery were prepared in the same manner as in Example 1, except for the selection and content of solvent components in the electrolyte and the type of negative electrode graphite, as shown in Table 1 below.

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Abstract

The invention relates to non-aqueous electrolyte, a preparation method of the non-aqueous electrolyte and a lithium ion secondary battery containing the non-aqueous electrolyte. The non-aqueous electrolyte is characterized by consisting of a non-aqueous solvent and electrolyte, wherein the electrolyte comprises at least one of LiBOB, LiCF3SO3, Li(CF3SO2)2N, LiPF6, LiBF4, LiClO4, LiAsF6, lithium halide and lower aliphatic acid lithium carbonate; lithium salt in the electrolyte has the concentration of 0.5 to 2.0M; the non-aqueous solvent comprises at least one of ethylene carbonate, diethyl carbonate, dimethyl carbonate, methyl ethyl carbonate, propylene carbonate, methyl formate, methyl acrylate, methyl butyrate, ethyl acetate, dimethyl sulfide, acetic ester and propionate, and another fluoride; and the weight percentage of the fluoride in the non-aqueous solvent is 0.1 to 70 percent. The electrolyte provided by the invention not only has high chemical stability, but also does not influence the service life of the battery.

Description

technical field [0001] The invention relates to a non-aqueous electrolytic solution, a preparation method thereof and a lithium ion secondary battery containing the electrolytic solution. Background technique [0002] Due to the characteristics of high voltage, high capacity density, no memory effect and no pollution, lithium-ion secondary batteries have been widely used in portable devices such as mobile phones and notebook computers in recent years. Lithium-ion secondary batteries are mainly composed of battery casings, electrode groups, and electrolytes. The positive electrode of lithium ion secondary battery uses lithium metal composite oxide as the positive electrode active material. Negative electrode active materials include various carbon materials such as graphitized carbon and pyrolytic carbon, and non-carbon materials such as oxides and nitrides of tin and silicon. In addition, the electrolyte is also an important part of the battery, which has a great influence...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0569H01M10/0525
CPCY02E60/122Y02E60/10
Inventor 刘国刚
Owner IRICO
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