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Nonaqueous electrolyte containing sulfonyl fluoride imidogen lithium salt as well as application of electrolyte

A non-aqueous electrolyte, fluorosulfonyl technology, applied in circuits, electrical components, battery electrodes, etc., can solve the problem of not changing and completely eliminating the root cause.

Inactive Publication Date: 2014-05-14
SUZHOU FLUOLYTE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These pass through the LiPF 6 Adding various functional additives to the non-aqueous electrolyte is a technical means to improve the stability of the electrolyte. Although it improves the high-temperature performance of lithium-ion batteries to a certain extent, it does not fundamentally change and completely eliminate LiPF. 6 The essential characteristics of thermal decomposition

Method used

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  • Nonaqueous electrolyte containing sulfonyl fluoride imidogen lithium salt as well as application of electrolyte
  • Nonaqueous electrolyte containing sulfonyl fluoride imidogen lithium salt as well as application of electrolyte
  • Nonaqueous electrolyte containing sulfonyl fluoride imidogen lithium salt as well as application of electrolyte

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] Examples 1-16 relate to Li[(FSO 2 )(CF 3 CH 2 OSO 2 )N](Li[TFE-FSI]) conductive lithium salt non-aqueous electrolyte in battery applications.

[0040] Example 1

[0041] Li[TFE-FSI]–EC / EMC(3:7,v / v) Electrolyte Cycle Evaluation at Room Temperature

[0042] 1) Fabrication of positive electrode: LiCoO 2 Powder, carbon black (particle size 1000nm), polyvinylidene fluoride (PVDF) and N,N-dimethylpyrrolidone (NMP) are mixed to make a uniform slurry, and the slurry is evenly coated on an aluminum foil (15 μm) current collector on, then dried and rolled to obtain LiCoO 2 Cathode material. Bake at 120°C for 12 hours, in the dried pole piece, LiCoO 2 It accounts for 94% of the total coating, binder accounts for 4%, and carbon black accounts for 2%. Then the obtained pole piece was cut into a disc with a diameter of 12 mm as the positive pole.

[0043] 2) Preparation of negative electrode: Mix artificial graphite, polyvinylidene fluoride (PVDF) and N,N-dimethylpyrrolidon...

Embodiment 2

[0048] LiPF 6 – EC / EMC (3:7, v / v) electrolyte cycle evaluation at room temperature

Embodiment 3

[0053] Evaluation of Li[TFE-FSI]–EC / EMC(3:7,v / v) Electrolyte for High Temperature Cycle

[0054] The same non-aqueous electrolyte as in Example 1 was used to assemble the same battery as in Example 1, and a high-temperature cycle performance test was performed. Test conditions: The assembled battery is directly subjected to a high-temperature cycle test in a constant temperature test box at 60°C, and the cut-off voltage is 4.2–2.75V. The charge rate is 0.5C, and the discharge rate is 0.2C. The test data of this embodiment is shown in Table 1.

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Abstract

The invention discloses nonaqueous electrolyte by taking asymmetrical (sulfonyl fluoride) (multi-fluorine alkoxy sulfonyl) lithium imide as conductive salt. The nonaqueous electrolyte has the characteristics of high thermal stability, high redox resistance, no aluminum foil corrosion and the like. Under the condition of no additive, the electrolyte material and the lithium ion battery electrode material have favorable compatibility; meanwhile, the electrolyte material has better room-temperature and high-temperature circulation stability than LiPF6, and can serve as a nonaqueous electrolyte additive for improving the high-temperature cycle and storage performances based on the LiPF6 electrolyte.

Description

technical field [0001] The invention belongs to the technical field of new materials and electrochemistry, and in particular relates to a fluorine-containing sulfonimide-based lithium salt non-aqueous electrolytic solution and its application in lithium ion batteries. Background technique [0002] Non-aqueous electrolyte is one of the key materials for energy storage devices such as secondary lithium (ion) batteries, and its comprehensive properties (such as chemical and electrochemical stability, safety, etc.) directly affect the use of batteries. At present, the electrolyte of commercialized lithium batteries is mainly composed of organic carbonates (such as dimethyl carbonate, diethyl carbonate, ethylene carbonate, etc.) and conductive salts (mainly LiPF 6 )composition. The flammability and volatility of organic carbonates in this system are the main safety hazards (such as combustion, explosion, leakage, etc.) of current battery systems. At the same time, it is general...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0568
CPCH01M4/362H01M10/0525H01M10/0568H01M10/0569Y02E60/10
Inventor 陈瀚林陈世忠周志彬
Owner SUZHOU FLUOLYTE
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