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Electrolyte for lithium ion secondary battery and battery containing the electrolyte

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

Active Publication Date: 2009-08-19
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] Various methods known to those skilled in the art can be used for the preparation method of the positive electrode and the negative electrode.

[0058] According to the lithium ion battery provided by the present invention, the diaphragm 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 membrane, modified polypropylene felt, polyethylene felt, glass fiber felt, ultrafine glass fiber paper A composite membrane made of vinylon felt or nylon felt and wettable polyolefin microporous membrane by welding or bonding.

[0059] According to the lithium ion battery provided by the present invention, the prep...

Embodiment 1

[0062] 1. Preparation of electrolyte

[0063] LiPF 6 Add 1-methyl-3-ethylimidazolium hexafluorophosphate (EMI-PF 6 ) 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 Naphthalene is 1 mol / 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 LiFePO 4 , 3.5 parts by weight of binder 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 Positive slurry. Use a coating machine to evenly coat the obtained positive electrode slurry on a 20 μm thick aluminum foil conductive substrate, dry at 130 ° C, cut and calender to ob...

Embodiment 2

[0072] 1. Preparation of electrolyte

[0073] LiPF 6 , Add 1-methyl-3-ethylimidazolium tetrafluoroboric acid (EMI-BF 4 ) 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 Naphthalene is 1 mol / 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] A lithium-ion secondary battery was prepared according to the method described in Example 1 to obtain a lithium-ion secondary battery with a model number of 053450A, 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 invention relates to an electrolytic solution for a lithium ion secondary battery, and to a lithium ion secondary battery containing the electrolytic solution. Background technique [0002] Since 1992, lithium-ion secondary batteries have been industrialized for more than ten years, due to their high working voltage, high specific energy, wide application temperature range, low self-discharge rate, long cycle life, no memory effect, low power consumption and safety, etc. With its unique advantages, it has been widely used as the power supply of electronic equipment such as mobile phones, portable computers, digital cameras, etc., and has begun to gradually replace traditional batteries in the fields of aerospace, small medical instruments, and military communication equipment. [0003] Although lithium-ion secondary batteries have the above-mentioned multiple advantages, this kind of secondary battery has not been able to replace the application of...

Claims

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Application Information

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