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Lithium ion battery electrolyte containing LiFSI

A technology for lithium bisfluorosulfonyl imide and lithium ion battery, which is applied in the field of lithium ion battery electrolyte containing lithium bisfluorosulfonyl imide, and can solve the corrosion of aluminum current collector, corrosion of aluminum current collector, and dense pores. and other problems to achieve the effect of improving service life and safety performance and inhibiting corrosion

Active Publication Date: 2014-03-26
SHANSHAN ADVANCED MATERIALS QUZHOU CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, the above-mentioned prior art only solves the technical problem of poor thermal stability of lithium-ion battery electrolyte. For electrolyte containing LiFSI, there is still the problem of corrosion to lithium battery electrodes. Aluminum current collectors are severely corrosive, and at voltages greater than 4.2V, even in the presence of LiPF 6 Passivation of aluminum foil, but as the number of charge and discharge increases, the LiFSI-containing electrolyte can destroy the passivation film on the surface of the aluminum current collector, further corrode the aluminum current collector, and cause dense pores in the aluminum current collector, thus affecting the lithium-ion battery. safety performance
[0005] Therefore, in order to further develop the application of LiFSI in view of the shortcomings of the existing technology, it is urgent to solve the corrosion problem of LiFSI on the aluminum current collector at high potential.

Method used

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  • Lithium ion battery electrolyte containing LiFSI
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  • Lithium ion battery electrolyte containing LiFSI

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] 1. Preparation of lithium-ion battery electrolyte containing LiFSI:

[0034] In a glove box filled with argon (moisture content 6 , and then add lithium bisfluorosulfonyl imide (LiFSI), vinyl sulfate (DTD), lithium difluorooxalate borate (LiDFOB) and vinylene carbonate (VC) according to the dosage in Table 1, respectively, to prepare LiFSI-containing Lithium-ion battery electrolytes A1, B1, C1, D1.

[0035] Among them, LiPF 6 , DTD, LiDFOB and VC dosage units (%) are based on the percentage of the total mass of the lithium-ion battery electrolyte.

[0036] Table 1. Li-ion battery electrolyte A1, B1, C1, D1

[0037]

[0038] 2. Battery corrosion performance test:

[0039] The above-mentioned lithium-ion battery electrolytes A1, B1, C1, D1 were respectively injected into the positive electrode coated lithium cobalt oxide, the negative electrode graphite, and the diaphragm made of polypropylene soft pack batteries a1, b1, c1, d1, the rated capacity of the battery is ...

Embodiment 2

[0047] Using the method of Example 1, the additive vinyl sulfate (DTD) is replaced by dimethyl sulfate (DMS), and the other steps are exactly the same, and lithium-ion battery electrolytes A2, B2, C2, D2 containing LiFSI and containing Batteries a2, b2, c2, d2 of the corresponding lithium-ion battery electrolyte.

[0048] The battery corrosion performance test of Example 1 is adopted, and the experimental results prove that: when adding dimethyl sulfate (DMS) and lithium difluorooxalate borate (LiDFOB) respectively in the lithium-ion battery electrolyte, the combined use of the two has a significant effect on inhibiting LiFSI from corroding aluminum. Current collectors are effective, but DMS or LiDFOB alone in Li-ion battery electrolytes are ineffective in inhibiting LiFSI from corroding aluminum current collectors.

Embodiment 3

[0050] Using the method of Example 1, the additive ethylene sulfate (DTD) is replaced by 1,4-butanediol sulfate, and the other steps are exactly the same, and lithium-ion battery electrolytes A3, B3, C3, and D3 containing LiFSI are obtained respectively And batteries a3, b3, c3, d2 containing the corresponding lithium-ion battery electrolyte.

[0051] The battery corrosion performance test of Example 1 is adopted, and the experimental results prove that: when 1,4-butanediol sulfate and lithium difluorooxalate borate (LiDFOB) are added respectively in the lithium-ion battery electrolyte, the combined use of the two has a great effect on inhibiting LiFSI. Corrosion of aluminum current collectors is effective, but when 1,4-butanediol sulfate or LiDFOB is used alone in lithium-ion battery electrolytes, it is ineffective in inhibiting LiFSI from corroding aluminum current collectors.

[0052] In summary, the lithium ion battery electrolyte containing lithium bisfluorosulfonyl imide...

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Abstract

The invention relates to the technical field of lithium ion battery electrolytes, in particular to a lithium ion battery electrolyte containing LiFSI. The electrolyte comprises a nonaqueous organic solvent and a solute, wherein the solute comprises LiFSI, lithium difluoroborate, other lithium salts and sulfate compounds. The electrolyte works in a high voltage which is bigger than 4.3V. The corrosion of the LiFSI to an aluminum current collector can be well inhibited so that the service life of a lithium ion battery can be obviously prolonged, and the safety performance of the lithium ion battery can be obviously improved.

Description

technical field [0001] The invention relates to the technical field of lithium-ion battery electrolytes, in particular to a lithium-ion battery electrolyte containing lithium bisfluorosulfonyl imide. Background technique [0002] Lithium-ion battery electrolyte is an important part of lithium-ion batteries. As lithium-ion batteries are more and more widely used in various fields such as digital, model aircraft, energy storage, and power, more requirements are placed on the electrolyte. At present, among the non-aqueous electrolytes of commercial lithium-ion batteries, lithium hexafluorophosphate (LiPF 6 ) as a conductive salt, which is mainly due to the LiPF 6 An electrolyte dissolved in a mixed solvent of cyclic carbonates (such as EC, PC) and linear straight-chain carbonates (such as DMC, DEC or EMC), and LiPF 6 It has excellent properties such as high electrical conductivity, strong oxidation-reduction resistance, passivation and non-corrosion of positive electrode curr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0568
CPCH01M10/0568H01M2300/0025Y02E60/10
Inventor 夏南南郭明丁祥欢
Owner SHANSHAN ADVANCED MATERIALS QUZHOU CO LTD