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Lithium ion battery electrolyte solution and preparation method thereof, and lithium ion battery

A lithium-ion battery and electrolyte technology, applied in secondary batteries, circuits, electrical components, etc., can solve problems such as flatulence of lithium titanate batteries

Inactive Publication Date: 2016-07-27
LONG POWER SYST SUZHOU
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Based on this, it is necessary to provide an electrolyte solution for lithium ion batteries that is not easy to cause severe flatulence in lithium titanate batteries for the electrolyte of traditional lithium-ion batteries that easily causes severe flatulence in lithium titanate batteries.

Method used

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  • Lithium ion battery electrolyte solution and preparation method thereof, and lithium ion battery
  • Lithium ion battery electrolyte solution and preparation method thereof, and lithium ion battery
  • Lithium ion battery electrolyte solution and preparation method thereof, and lithium ion battery

Examples

Experimental program
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preparation example Construction

[0035] Such as figure 1 The preparation method of the electrolyte of above-mentioned lithium-ion battery shown, comprises the steps:

[0036] S10. Baking the electrolyte and the inorganic lithium salt additive at 80°C to 130°C for 12h to 48h to remove moisture, and performing dehydration treatment on the cyclic ether solvent and the chain ether solvent until the moisture content is below 10ppm to obtain dehydration The final electrolyte, cyclic ether solvent, chain ether solvent and inorganic lithium salt additive.

[0037] The electrolyte and the inorganic lithium salt additive can be placed in a vacuum vibration drying oven and baked at 80°C to 130°C for 12h to 48h to remove moisture.

[0038] The cyclic ether solvent and the chain ether solvent can be dewatered with molecular sieves until the water content is less than 10 ppm.

[0039] S20, mixing the dehydrated electrolyte, cyclic ether solvent, chain ether solvent and inorganic lithium salt additive in step S10 in an in...

Embodiment 1

[0045] LiODFB (99.95% pure) and LiNO 3 (purity is 99.95%) placed in a vacuum vibration drying oven at 130 ° C for 24 hours, cooled down. The solvents DME (purity: 99.99%) and DOL (purity: 99.99%) are treated with molecular sieves to reduce their water content to less than 10ppm, and LiODFB, DME, DOL, and LiNO are obtained after water removal. 3 .

[0046] LiODFB, DME, DOL and LiNO after water removal 3 Prepare the electrolyte in a glove box filled with argon: 1.0mol / LLiODFB+0.1mol / LLiNO 3 , DOL:DME=1:1 (volume ratio), the electrolyte solution of lithium-ion battery is obtained. The composition and basic performance test data of the electrolyte of the lithium-ion battery are shown in Table 1.

[0047] Composition and basic performance testing data of the electrolyte of the lithium ion battery of table 1 embodiment 1

[0048]

[0049] It can be seen from Table 1 that the room temperature ionic conductivity of the electrolyte of the lithium ion battery of Example 1 is rel...

Embodiment 2

[0051] LiTFSi (99.95% pure) and LiNO 3 (purity is 99.95%) placed in a vacuum vibration drying oven at 130 ° C for 24 hours, cooled down. The solvents DME (purity: 99.99%) and DOL (purity: 99.99%) are treated with molecular sieves to reduce their water content to less than 10ppm, and LiODFB, DME, DOL, and LiNO are obtained after water removal. 3 .

[0052] LiTFSi, DME, DOL and LiNO after water removal 3 Prepare the electrolyte in a glove box filled with argon: 1.0mol / LLiTFSi+0.1mol / LLiNO 3 , DOL:DME=1:1 (volume ratio), the electrolyte solution of lithium-ion battery is obtained. The composition and basic performance test data of the electrolyte of the lithium-ion battery are shown in Table 2.

[0053] The composition of the electrolyte of the lithium-ion battery of the embodiment 2 of table 2 and basic performance detection data

[0054]

[0055]

[0056] It can be seen from Table 2 that the room temperature ionic conductivity of the electrolyte of the lithium ion ba...

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Abstract

The invention discloses a lithium ion battery electrolyte solution including an electrolyte, a cyclic ethers solvent, a chain ethers solvent and an inorganic lithium salt additive. Compared with a traditional carbonic acid esters solvent, the cyclic ethers solvent and the chain ethers solvent in the electrolyte solution disclosed by the invention are less prone to chemical decomposition to generate gas molecules; at the same time, with additional use of the inorganic lithium salt additive, induced decomposition of a lithium titanate material on the electrolyte solution can be inhibited, and thus the high-rate charge / discharge cycling stability of a corresponding battery is greatly improved. Therefore, compared with the traditional lithium ion battery electrolyte solution, the lithium ion battery electrolyte solution disclosed by the invention is less prone to chemical decomposition to generate the gas molecules, so as to prevent the lithium titanate battery from generating flatulence.

Description

technical field [0001] The invention relates to the field of lithium ion batteries, in particular to an electrolyte solution for a lithium ion battery, a preparation method thereof, and a lithium ion battery using the electrolyte solution. Background technique [0002] As one of the new energy sources, lithium-ion batteries are widely used in electronic products, electric vehicles and implanted medical devices due to their high energy density and long service life. With the expansion of the application range of lithium-ion batteries, higher requirements are put forward for the safety of battery materials, battery high-rate charge and discharge performance, and cycle life. The traditional lithium-ion battery negative electrode material is graphite, but it has serious defects: (1) The surface of the graphite carbon negative electrode has the formation and growth of the surface solid-electrolyte interface film (SEI), so that the irreversible capacity of the related battery incr...

Claims

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Application Information

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IPC IPC(8): H01M10/0525H01M10/0569H01M10/0567
CPCY02E60/10
Inventor 孙喜梅黄碧英
Owner LONG POWER SYST SUZHOU
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