Electrolyte solution for improving swelling of lithium ion battery

An electrolyte solution, lithium-ion battery technology, applied in electrical components, secondary batteries, circuits, etc., can solve problems such as increased internal resistance of batteries, decreased battery charge-discharge cycle performance, etc., to reduce gas problems and achieve superior electrochemical performance. The effect of exerting and reducing reactivity

Inactive Publication Date: 2012-01-18
BASF BATTERY MATERIALS SUZHOU
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the application of ternary cathode materials in lithium-ion batteries has the problem of gassing, especially in the high-nickel ternary cathode material system. During the high-temperature charged storage process, because the nickel element is relatively active, it is easy to react with the electrolyte to generate gas, which will cause the lithium Ion battery blows, and at the same time leads to a sharp increase in the internal resistance of the battery, which reduces the charge-discharge cycle performance of the battery

Method used

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  • Electrolyte solution for improving swelling of lithium ion battery
  • Electrolyte solution for improving swelling of lithium ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Prepare the 503048 square aluminum case battery of 750mAh, wherein the positive electrode of the battery is Li 1.05 Ni 0.8 co 0.17 al 0.03 o 2 , the negative electrode is artificial graphite, and the separator is polypropylene (PP) / polyethylene (PE) / polypropylene (PP); respectively pouring different electrolytes, storing them at 85 degrees for 4 hours and 60 degrees for 30 days, and testing their thickness Variety. After high temperature storage, the thickness change is required to be no more than 5%.

[0018] This embodiment is specifically shown in the following table:

[0019] test electrolyte 85 degrees storage for 4 hours thickness change Store at 60 degrees for 30 days thickness change Example 1-1 1M LiBF 4 EC-EMC (30 / 70, v / v), VC (1wt%)+PS (2wt%)+SN (1wt%) 13.1% 14.7% Example 1-2 1M LiBF 4 EC-EMC-GBL (30 / 40 / 30, v / v), VC (1wt%)+PS (2wt%)+SN (1wt%) 4.3% 4.5% Example 1-3 1M LiBF 4 EC-EMC-GBL (30 / 30 / 40, v / v)...

Embodiment 2

[0024] Prepare 523550 soft-pack lithium-ion batteries of 1000mAh, wherein the positive electrode of the battery is Li 1.05 Ni 0.8 co 0.17 al 0.03 o 2 , the negative electrode is artificial graphite, and the separator is polypropylene (PP) / polyethylene (PE) / polypropylene (PP); respectively pouring different electrolytes, storing them at 85 degrees for 4 hours and 60 degrees for 30 days, and testing their thickness Variety. After high temperature storage, the thickness change is required to be no more than 10%.

[0025] This embodiment is specifically shown in the following table:

[0026] Electrolyte 85 degrees storage for 4 hours thickness change Store at 60 degrees for 30 days thickness change Example 2-1 1M LiBF4 EC-EMC-GBL (30 / 20 / 50, v / v), VC (1.5wt%) 23.1% 24.7% Example 2-2 1M LiBF4 EC-EMC-GBL (30 / 20 / 50, v / v), VC (1.5wt%)+PS (1.5wt%) 8.3% 8.5% Example 2-3 1M LiBF4 EC-EMC-GBL (30 / 20 / 50, v / v), VC (1.5wt%)+SN (1wt%) 6.8% 7.1% ...

Embodiment 3

[0030] Prepare 523550 soft-pack lithium-ion batteries of 1000mAh, wherein the positive electrode of the battery is Li 1.05 Ni 0.8 co 0.17 al 0.03 o 2 , the negative electrode is artificial graphite, and the separator is polypropylene (PP) / polyethylene (PE) / polypropylene (PP); according to the experimental results of Example 2, ethylene carbonate (EC)-ethyl methyl carbonate (EMC) was selected - Butyrolactone (GBL) (30 / 20 / 50, v / v) solvent system and vinylene carbonate (VC) (1wt%) + 1,3 propane sultone (PS) (2wt%) + butane Dinitrile (SN) (1wt%) is a composite additive, LiB(C 2 o 4 ) 2 Salt, inject its electrolyte into the battery to be tested, and test the thickness change of the battery after high-temperature storage (85 degrees for 4 hours).

[0031] This embodiment is specifically shown in the following table:

[0032] Electrolyte Thickness change after storage at 85 degrees for 4 hours Example 3-1 0.7M LiB(C 2 o 4 ) 2 EC-EMC-GBL (30 / 20 / 50,...

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Abstract

The invention relates to electrolyte solution which can improve the swelling of a lithium ion battery; the electrolyte solution for improving the swelling of the lithium ion battery comprises three types of components: (1) lithium salt; (2) composite organic solvent of carbonate ester and cyclic lactone compounds; and (3) composite additive; the molar concentration of lithium salt in the electrolyte solution is 0.01 to 2 mol/L; the mass percentage of the composite additive in the electrolyte solution is 0.01 percent to 5 percents; in the lithium salt, one or more of the following substances coexist: LiBF4, LiN (CF3SO2) 2, LiC4F9SO3, LiN (CxF2x+1SO2) (CyF2y+1SO2) (x and y are natural numbers), LiB (C2O4) 2 or LiBF2C2O4. According to the invention, through the composition design of the electrolyte solution and the comprehensive application of composite organic solvent of carbonate ester and cyclic lactone compounds and the composite additive, the reactivity with a high nickel positive pole material is reduced, the swelling problem of a secondary lithium ion battery based on the high nickel positive pole material when in high-temperature storage is greatly solved, and the electrochemical properties of the lithium ion battery can be well displayed.

Description

technical field [0001] The invention relates to an electrolytic solution, in particular to an electrolytic solution for improving the gassing of a lithium ion battery. Background technique [0002] Lithium-ion battery is currently the most ideal and highest-tech rechargeable chemical battery in the world. Compared with other batteries, lithium-ion battery has better performance. The electrochemical performance of lithium-ion batteries mainly depends on the structure and performance of the electrode materials used, and the electrolyte material is the bridge to ensure the superior performance of the electrode materials. As the key material of lithium-ion battery electrode materials, cathode materials have always been the focus of research and development. Improving the performance of cathode materials is the key to improving the performance of lithium-ion batteries. Improving the performance of the positive electrode material can be manifested in two aspects: one is that the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0569H01M10/0567
CPCY02E60/12Y02E60/10
Inventor 胡学山袁芳金丽华周小进顾红健
Owner BASF BATTERY MATERIALS SUZHOU
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