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Electrolyte additive and electrolyte and lithium ion battery containing same

An electrolyte additive and additive technology, applied in the field of electrolyte additive, electrolyte and lithium-ion batteries, can solve the problems of not being able to improve the comprehensive performance of secondary batteries, and achieve improved rate discharge performance, safety performance, cycle performance and high temperature Effect of storage performance improvement

Active Publication Date: 2010-03-17
BYD CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The purpose of the present invention is to overcome the shortcoming that existing additives cannot improve the comprehensive performance of secondary batteries, and provide a kind of electrolyte flame-retardant additive that improves the comprehensive performance of batteries. This additive can not only improve the safety performance of batteries, but also contains The rate discharge characteristics, cycle performance and high temperature storage performance of the battery with this electrolyte additive are greatly improved

Method used

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  • Electrolyte additive and electrolyte and lithium ion battery containing same
  • Electrolyte additive and electrolyte and lithium ion battery containing same
  • Electrolyte additive and electrolyte and lithium ion battery containing same

Examples

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Effect test

preparation example Construction

[0041] Various methods known in the art can be used for the preparation method of the positive electrode and the negative electrode.

[0042] According to the lithium ion secondary 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 case together with the positive electrode, negative electrode and electrolyte. The separator layer can be selected from various separator layers used in lithium-ion secondary batteries known to those skilled in the art, such as polyolefin microporous membrane, modified polypropylene felt, polyethylene felt, glass fiber felt, ultra-fine glass Composite membrane made of fiber paper vinylon felt or nylon felt and wettable polyolefin microporous membrane by welding or bonding.

[0043] According to the lithium ion battery provided by the present invention, the preparation ...

Embodiment 1

[0046] 1. Preparation of electrolyte

[0047] Mix 60 grams of vinyl carbonate (EC), 30 grams of methyl ethyl carbonate (EMC) and 60 grams of diethyl carbonate (DMC) into a mixed solvent; add 19.54 grams of LiPF to the mixed solvent 6 Electrolyte. The concentration of LiPF6 in the electrolyte is 1M L -1 , then add film-forming additive vinylene carbonate (VC) 2.54 grams (1.5wt%) and flame retardant additive 3,5-dichloropyridine 8.6 grams (5%) to it, stir until all solid substances are all dissolved, obtained organic electrolyte.

[0048]

[0049] 3,5-Dichloropyridine

[0050] 2. Preparation of positive electrode

[0051] Dissolve 90 grams of polyvinylidene fluoride in 1350 grams of N-methyl-2-pyrrolidone (NMP) solvent to prepare an adhesive solution, and then add 2820 grams of LiCoO to the resulting solution 2 and 90 grams of acetylene black, fully mixed to obtain a positive electrode slurry, which was evenly coated on a 20-micron aluminum foil, dried at 125°C for 1 hour...

Embodiment 2

[0057] Electrolyte is prepared according to the same method as in Example 1, except that the flame retardant additive is 3-bromo-5-methoxypyridine, and the amount of 3-bromo-5-methoxypyridine is 17.2 grams (10% )

[0058]

[0059] 3-Bromo-5-methoxypyridine

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Abstract

The invention provides an electrolyte additive. The additive is a pyridine compound with a special structure, and can improve comprehensive performance of the battery containing the electrolyte additive. The additive not only improves the safety performance of the battery, but also improves the high-rate discharge performance, cycle performance and high-temperature storage performance the batterycontaining the electrolyte additive.

Description

【Technical field】 [0001] The invention relates to an electrolyte additive, an electrolyte containing the additive, and a lithium ion battery. 【Background technique】 [0002] With the rapid development of information technology and the increasing popularity of portable electronic devices, the demand for high specific energy batteries is increasing year by year. Lithium-ion batteries have the advantages of high working voltage, large specific energy, light weight, and long cycle life. They have been widely used in cameras, mobile phones, notebook computers, and portable measuring instruments. They are gradually replacing traditional batteries and expanding their application fields and market share. . At the same time, due to the increasing demand for green energy in recent years, lithium-ion batteries for electric vehicles have also attracted more and more attention. [0003] However, the potential safety hazards of lithium-ion batteries have always been the primary concern ...

Claims

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Application Information

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IPC IPC(8): H01M10/40H01M10/36H01M10/38C07D213/61
CPCY02E60/12Y02E60/10Y02P70/50
Inventor 王圣王岩
Owner BYD CO LTD
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