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Non-aqueous electrolytic solution for lithium ion secondary battery and manufacturing method thereof

A non-aqueous electrolyte and secondary battery technology, applied in secondary batteries, circuits, electrical components, etc., can solve the problems of reduced battery charge and discharge performance, low lithium ion conductivity, etc., and achieve improved cycle performance, simple process, low cost effect

Inactive Publication Date: 2009-06-10
CITIC GUOAN MENGGULI NEW ENERGY TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The key reason why the non-aqueous electrolyte affects the cylindrical lithium-ion secondary battery is that when the lithium-ion secondary battery is formed, the electrolyte will form a layer of solid electrolyte film (SEI film for short) on the positive and negative electrodes. The conductivity to lithium ions is low, so the charge and discharge performance of the battery will be significantly reduced, and the cycle performance and rate performance of the battery depend on this layer of SEI film

Method used

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  • Non-aqueous electrolytic solution for lithium ion secondary battery and manufacturing method thereof
  • Non-aqueous electrolytic solution for lithium ion secondary battery and manufacturing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] a) The three refined solvents ethylene carbonate (EC), gamma-butyrolactone (GBL), and ethyl methyl carbonate (EMC) are mixed uniformly in a weight ratio of 1:1:1, and the quality of the carbonate solution obtained is 880 grams;

[0038] b) Slowly add 120 g of 1M LiPF 6 , so that it is completely dissolved to form a basic anhydrous electrolyte;

[0039] c) Add 2.0% of 1,3-propane sultone and 0.5% of lithium oxalyl difluoroborate composition additive to the basic anhydrous electrolyte, stir ultrasonically and mix evenly to obtain a colorless and transparent non-aqueous electrolytic solution Liquid, colorless and transparent non-aqueous electrolyte by 100%.

[0040] Electrolyte performance test: In order to strictly control the moisture and acidity of the electrolyte, the obtained electrolyte was injected into a 18650 cylindrical lithium-ion secondary battery in a Braun glove box, and the positive electrode was spinel lithium manganate (LiMn 2 o 4 ) material and the ne...

Embodiment 2

[0054] a) four refined solvents EC, DMC, EMC, and propylene carbonate PC are mixed uniformly in a weight ratio of 0.8:1:1:0.2 to obtain 880 grams of carbonate;

[0055] b) Slowly add 1.1M LiPF 6 132 grams to make it completely dissolved to form a basic anhydrous electrolyte;

[0056] c) Add 1.0% 1,3-propane sultone and 1.0% lithium oxalyl difluoroborate additives to the basic anhydrous electrolyte, stir ultrasonically and mix evenly to obtain a colorless and transparent non-aqueous Electrolyte, colorless and transparent non-aqueous electrolyte is calculated as 100%.

[0057] Inject the obtained electrolyte solution into a 18650-type cylindrical lithium-ion secondary battery in a Braun glove box. Formation, cycle performance test, the cycle performance of battery is shown in Table 2 and figure 1 . Table 1 compares the safety performance (weight impact test) of the steel case battery manufactured according to this embodiment with the steel case battery of Example 1 and Compa...

Embodiment 3

[0061] a) The refined four solvents EC, DMC, EMC, and DEC are uniformly mixed in a weight ratio of 0.8:1:1:0.2 to obtain 880 grams of carbonate;

[0062] b) Slowly add 1.2M LiPF 6 , 144 grams, so that it is completely dissolved to form a basic anhydrous electrolyte;

[0063] c) Add 1.6% vinylene carbonate, 1.5% 1,3-propane sultone, and 1.5% lithium oxalyl difluoroborate additives in sequence, and mix evenly. The mixed electrolyte is as follows: 100% meter.

[0064] Inject the obtained electrolyte solution into a 18650-type cylindrical lithium-ion secondary battery in a Braun glove box. Formation and cycle performance test, the cycle performance of the battery is shown in Table 2.

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Abstract

The invention provides a nonaqueous electrolytic solution for a lithium ion secondary battery. The nonaqueous electrolytic solution comprises a nonaqueous solvent, a lithium salt and an additive, wherein the additive is a composition of cyclic sultone and oxalyl lithium difluoroborate. The invention also provides a method for preparing the nonaqueous electrolytic solution for the lithium ion secondary battery. The solution has the advantages that the nonaqueous electrolytic solution has obviously improved effect, low cost and simple process, is applicable to practical application, and can improve the cycling performance by over 50 percent. On the other hand, as the nonaqueous electrolytic solution is not required to form more electrolytic solution, the characteristics of the prior electrolytic solution can not be affected, such as high ionic conductance, high energy and low capacity decline. The nonaqueous electrolytic solution is both applicable to a cylindrical cell, a button cell, and a computer battery, a mobile phone battery, a battery of a vehicle using motor, a solar cell and the like.

Description

technical field [0001] The invention relates to a nonaqueous electrolytic solution for a lithium ion secondary battery and a preparation method thereof. Background technique [0002] Lithium-ion batteries have the advantages of high specific energy, light weight, and no memory effect, and are widely used in high-power electronic devices, such as notebook computers, digital cameras, DV, power tools, and even used in groups for electric vehicles . Cylindrical lithium-ion secondary batteries are widely used in the world's electronic product market, and their market share is much higher than that of similar nickel-cadmium and nickel-metal hydride batteries. It can be said that the above-mentioned electronic products are inseparable from lithium-ion secondary batteries. The domestic production and sales of lithium-ion secondary batteries are huge. However, the performance of cylindrical lithium-ion secondary batteries produced in China is generally inferior to that of Japanese ...

Claims

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Application Information

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IPC IPC(8): H01M10/40H01M10/0567
CPCY02E60/122Y02E60/10
Inventor 其鲁郭营军王剑安平李永伟
Owner CITIC GUOAN MENGGULI NEW ENERGY TECH
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