Additive composition and electrolytic solution and lithium ion secondary battery containing the same

A secondary battery and electrolyte technology, applied in the direction of secondary batteries, non-aqueous electrolyte batteries, organic electrolyte batteries, etc., can solve the problems of poor low-temperature discharge performance, etc., and achieve improved cycle performance, low recovery thickness and internal resistance, Effect of extending cycle life

Active Publication Date: 2008-06-18
SHANGHAI BYD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The object of the present invention is to overcome the shortcoming that the additive used in the prior art makes the low-temperature discharge performance of lithium-ion secondary batteries poor, and provides a kind of lithium-ion secondary battery electrolyte that makes the low-temperature discharge performance of lithium-ion batteries better. Additive composition, and electrolyte solution and lithium ion secondary battery containing the additive composition are provided

Method used

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  • Additive composition and electrolytic solution and lithium ion secondary battery containing the same
  • Additive composition and electrolytic solution and lithium ion secondary battery containing the same
  • Additive composition and electrolytic solution and lithium ion secondary battery containing the same

Examples

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preparation example Construction

[0023] The preparation method of the electrolyte is as follows: mixing the non-aqueous solvent, the electrolyte and the additive composition together. The mixing method and order are not limited, and the performance of the electrolyte will not be affected.

[0024] The electrolyte solution of the lithium ion secondary battery provided by the present invention contains a non-aqueous solvent, an electrolyte and an additive composition, wherein the additive composition is the additive composition provided by the present invention.

[0025] According to the electrolyte solution provided by the present invention, the content of the additive composition is 0.3-22% by weight of the total amount of the electrolyte solution, preferably 0.2-5% by weight.

[0026] According to the electrolytic solution provided by the present invention, the electrolyte can use any conventional electrolyte known to those skilled in the art, such as lithium hexafluorophosphate (LiPF 6 ), lithium perchlorat...

Embodiment 1

[0041] This example illustrates the additive composition, electrolyte, battery containing the electrolyte and their preparation methods provided by the present invention.

[0042] 1. Preparation of electrolyte

[0043] 50 grams of vinyl carbonate (EC), 50 grams of methyl ethyl carbonate (EMC) and 50 grams of diethyl carbonate (DEC) are mixed into a mixed solvent, and 20.81 grams of LiPF are added to the mixed solvent 6 Electrolyte, be made into the electrolytic solution that concentration is 1M, then add additive composition, 1,3-propane sultone (PS) is 0.34 gram, gamma-butyrolactone (GBL) 10.69 gram, tert-butyl in the additive composition 0.34 grams of benzene, the content of the additive composition in the prepared electrolyte is 6.4% by weight.

[0044] 2. Preparation of positive electrode

[0045] 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 resu...

Embodiment 2

[0051] Electrolyte and lithium ion secondary battery are prepared according to the same method as in Example 1, except that PS is replaced with 1,4-butane sultone, and 1,4-butane sultone is 0.91 in the additive composition gram, GBL is 7.25 grams, tert-butylbenzene is 2.71 grams, and the content of additive composition in the prepared electrolytic solution is 5.7 weight %.

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Abstract

The invention provides an additive combination of li-ion secondary battery electrolyte; wherein, the combination has three different compounds. By adopting the additive combination provided by the invention, the circulation performance, the high-temperature storage performance, the low-temperature discharging performance and the ratio discharging performance of the battery are greatly improved as a whole, and the comprehensive performance of the battery is greatly improved.

Description

technical field [0001] The invention relates to an additive composition for electrolyte solution of lithium ion secondary battery, electrolyte solution and lithium ion secondary battery containing the additive composition. Background technique [0002] At present, the basic composition of the commonly used lithium-ion secondary battery is, including the battery case, the electrode group and the electrolyte, the electrode group and the electrolyte are sealed in the battery case, and the electrode group includes the positive electrode, the separator and the Negative electrode, lithium metal composite oxide is used as the positive electrode active material in the positive electrode, graphite, silicon and other materials are used as the negative electrode active material in the negative electrode, and the separator is used to separate the positive and negative electrodes. Most of the new lithium-ion secondary batteries use carbon materials as the negative electrode of the batter...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/40H01M6/16H01M10/056H01M10/0567
CPCY02E60/122Y02E60/10
Inventor 周贵树范艺韦
Owner SHANGHAI BYD
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