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Electrolyte, lithium ion cell containing same and preparing process thereof

A technology of electrolyte and electrolyte, applied in the field of electrolyte, can solve the problems of battery overcharge safety and low-temperature discharge performance at the same time, and achieve the effects of enhancing overcharge safety, reducing production costs, and prolonging cycle life

Active Publication Date: 2007-04-18
BYD CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to overcome the disadvantage that the electrolyte of the lithium-ion battery in the prior art cannot simultaneously take into account the overcharge safety and low-temperature discharge performance of the battery, and provide a lithium-ion battery that can simultaneously improve the overcharge safety and low-temperature discharge performance of the battery Electrolyte

Method used

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  • Electrolyte, lithium ion cell containing same and preparing process thereof
  • Electrolyte, lithium ion cell containing same and preparing process thereof
  • Electrolyte, lithium ion cell containing same and preparing process thereof

Examples

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preparation example Construction

[0025] The preparation method of the electrolytic solution provided by the present invention comprises mixing the lithium salt as the electrolyte, the organic solvent and the additive, wherein the additive is selected from lithium carbonate, lithium sulfate, lithium sulfite, lithium nitric acid One or more of salt, lithium nitrite and lithium aluminate. Based on the total amount of the electrolyte, the additive is added in an amount of 0.1-5.0% by weight, preferably 0.3-2.0% by weight.

[0026] Although the additives with various particle sizes can achieve the purpose of the present invention, preferably, the particle diameter of the inorganic salt used as the additive of the present invention is below 25 microns. Therefore, it is preferable to refine the inorganic salts. The method of the refinement can be various refinement methods. For example, the inorganic salts as additives can be ball milled at 100-250 rpm in a ball mill for 1-8 minutes. Hours, first turn forward for 1...

Embodiment 1

[0038] This example illustrates the electrolyte solution provided by the present invention, batteries containing the electrolyte solution and their preparation methods.

[0039] (1) Preparation of electrolyte

[0040] 50 g Li 2 CO 3 , in a ball mill with a speed of 150 rpm for 4 hours, rotate forward for 10 minutes, then reverse for 10 minutes, repeat this way, and pass through a 200-mesh sieve after ball milling to obtain Li 2 CO 3 powder. The results of particle size analysis of the obtained powder show that the particle diameter is less than 1.562 micron Li 2 CO 3 10% smaller than 3.983 micron Li 2 CO 3 50% Li smaller than 22.24 microns 2 CO 3 95%.

[0041] In 210 ml of ethylene carbonate: ethyl methyl carbonate: diethyl carbonate: dimethyl carbonate = 2: 3: 1: 1 (volume ratio) mixed solvent, add 31.90 grams of LiPF 6 Prepare a solution of 1.0 mol / liter; let it stand for 30 minutes, and wait for the temperature of the solution to cool to ambient temperature, and ...

Embodiment 2-8

[0049] Electrolyte and lithium ion battery were prepared according to the method of Example 1, the difference was the type and amount of inorganic additives added and based on the total amount of the electrolyte, the content of additives in the electrolyte was shown in Table 1 below.

[0050] Example

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Abstract

The invention is an electrolyte, containing Li salt as electrolyte, organic solvent and additive, where the additive is selected from one or several of Li carbonate, Li sulfate, Li sulfite, Li nitrate, Li nitrite and Li aluminate. Thus, the overcharge safety and low temperature performance of a battery using the electrolyte containing inorganic matter additive are improved and there is no negative effect on the other performances of the battery, even obviously improved. And it not only enhances Li ion battery overcharge safety and improves the low temperature discharging performance, but also increases battery capacity, cycling performance, storage stability and reduces production cost.

Description

technical field [0001] The present invention relates to an electrolytic solution, a battery containing the electrolytic solution and their preparation method, in particular to a non-aqueous electrolytic solution, a lithium ion battery containing the electrolytic solution and their preparation method. Background technique [0002] Lithium-ion battery is a new type of chemical power source, which is widely used in portable electronic products such as mobile phones because of its high energy density, high working voltage, long life, and no environmental pollution. [0003] A lithium-ion battery includes a positive electrode, a negative electrode, a separator paper, and an electrolyte. The electrolytic solution includes a lithium salt as an electrolyte, an organic solvent and additives. Existing lithium-ion batteries use organic additives to increase overcharge safety or improve their low-temperature discharge characteristics. Organic additives have no effect on the work and p...

Claims

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Application Information

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IPC IPC(8): H01M10/40H01M6/16H01M10/0525H01M10/056H01M10/058
CPCY02E60/122Y02E60/10Y02P70/50
Inventor 肖峰王明霞周贵树
Owner BYD CO LTD
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