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Electrolyte for lithium ion secondary battery and battery containing the electrolyte

A secondary battery and electrolyte technology, which is applied in the field of electrolyte, can solve problems such as poor safety performance, and achieve the effects of improved safety performance, improved battery safety performance, and good cycle performance

Active Publication Date: 2012-07-04
BYD CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The object of the present invention is to overcome the defect of the poor safety performance of the lithium-ion battery in the above-mentioned prior art, provide a kind of electrolyte that makes the safety performance of the battery better, and also provide a kind of lithium-ion secondary battery containing the electrolyte

Method used

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  • Electrolyte for lithium ion secondary battery and battery containing the electrolyte
  • Electrolyte for lithium ion secondary battery and battery containing the electrolyte
  • Electrolyte for lithium ion secondary battery and battery containing the electrolyte

Examples

Experimental program
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preparation example Construction

[0057] The preparation methods of the positive electrode and the negative electrode can adopt various methods known to those skilled in the art.

[0058] According to the lithium ion battery provided by the present invention, the separator layer is arranged between the positive electrode and the negative electrode, has electrical insulation performance and liquid retention performance, and is sealed in the battery casing together with the positive electrode, the negative electrode and the electrolyte. The separator layer can be selected from various separator layers used in lithium ion batteries known to those skilled in the art, such as polyolefin microporous membranes, modified polypropylene felt, polyethylene felt, glass fiber felt, and ultra-fine glass fiber paper. Vinylon felt or nylon felt and wettable polyolefin microporous film are welded or bonded together.

[0059] According to the lithium ion battery provided by the present invention, the preparation method of the batter...

Embodiment 1

[0062] 1. Preparation of electrolyte

[0063] LiPF 6 Add 1-methyl-3-ethylimidazole hexafluorophosphate (EMI-PF 6 ) Prepare a solution in an ionic liquid (Aldrich Chemical Company), and then add naphthalene and 4-fluoroanisole to the solution to obtain an electrolyte. In this electrolyte, LiPF 6 The concentration of is 1mol / L, the content of naphthalene is 1% by weight, and the content of 4-fluoroanisole is 1.5% by weight.

[0064] 2. Preparation of lithium ion secondary battery

[0065] (1) Preparation of positive electrode

[0066] 100 parts by weight of LiFePO 4 , 3.5 parts by weight of adhesive polyvinylidene fluoride (PVDF) and 4.5 parts by weight of conductive agent acetylene black are added to 70 parts by weight of N-methylpyrrolidone (NMP), and then fully stirred and mixed in a vacuum mixer to make it evenly Positive electrode slurry. Use a coater to uniformly coat the obtained positive electrode slurry on a 20μm thick aluminum foil conductive substrate, dry it at 130°C, cut ...

Embodiment 2

[0072] 1. Preparation of electrolyte

[0073] LiPF 6 , Add 1-methyl-3-ethylimidazole tetrafluoroborate (EMI-BF 4 ) Prepare a solution in an ionic liquid (Aldrich Chemical Company), and then add naphthalene and 4-fluoroanisole to the solution to obtain an electrolyte. In this electrolyte, LiPF 6 The concentration of is 1mol / L, the content of naphthalene is 1% by weight, and the content of 4-fluoroanisole is 1% by weight.

[0074] 2. Preparation of lithium ion secondary battery

[0075] The lithium ion secondary battery was prepared according to the method described in Example 1, and a lithium ion secondary battery with a model number of 053450A was obtained, and the design capacity of the battery was 650mAh.

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Abstract

The invention provides an electrolyte solution for a lithium-ion secondary battery. The electrolyte solution comprises an ionogen, a solvent and an additive, wherein the additive is an oxidation-reduction pair additive and the solvent is an ionic liquid. The invention also provides the lithium-ion secondary battery. The lithium-ion secondary battery manufactured by the electrolyte solution provided by the invention has good elevated temperature property, overcharging property, storage property at high temperature, discharge property at low temperature, rate discharge property and good cycle property of the assembled battery, particularly improving the safety property of the battery remarkably. Additionally, the uniformity of each single battery and the safety property of each single battery and the battery pack are obviously improved during the charge and discharge process of the assembled battery.

Description

Technical field [0001] The present invention relates to an electrolyte for lithium ion secondary batteries, and to a lithium ion secondary battery containing the electrolyte. Background technique [0002] Since 1992, in the more than ten years of industrialization of lithium ion secondary batteries, due to its high working voltage, high specific energy, wide application temperature range, low self-discharge rate, long cycle life, no memory effect, low consumption and safety, etc. With unique advantages, it has been widely used as a power source for electronic devices such as mobile phones, portable computers, and digital cameras, and has begun to gradually replace traditional batteries in the fields of aerospace, small medical instruments and military communications equipment. [0003] Although lithium ion secondary batteries have the above-mentioned various advantages, this kind of secondary battery has not been able to replace the application of primary batteries in low-cost equi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/40H01M10/36
CPCY02E60/122Y02E60/10
Inventor 朱江民高艺潘福中
Owner BYD CO LTD
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