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Non-aqueous electrolyte for lithium ion battery, and application thereof

A non-aqueous electrolyte, lithium-ion battery technology, applied in secondary batteries, circuits, electrical components, etc., can solve problems such as poor thermal stability and chemical stability

Inactive Publication Date: 2014-01-15
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] An object of the present invention is to provide a kind of non-aqueous electrolytic solution that is used for lithium ion battery, to replace lithium hexafluorophosphate (LiPF5) that is widely used but has many shortcomings at present. 6 ) electrolyte to overcome LiPF 6 The thermal and chemical stability of the electrolyte is poor, and it can significantly improve the high-temperature electrochemical performance of lithium-ion batteries

Method used

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  • Non-aqueous electrolyte for lithium ion battery, and application thereof
  • Non-aqueous electrolyte for lithium ion battery, and application thereof
  • Non-aqueous electrolyte for lithium ion battery, and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0068] (1) Production of positive electrode

[0069] 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, and 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.

[0070] (2) Production of negative electrode

[0071] Artificial graphite, polyvinylidene fluoride (PVDF) and N,N-dimethylpyrrolidone (NMP) were mixed to make a uniform slurry, and the slurry was uniformly coated on a copper foil (15 μm) current collector, and then dried , rolled to obtain the carbon negative electrode material. Bake at 120° C. for 12 hours. In the dried p...

Embodiment 2

[0080]The same non-aqueous electrolyte as in Example 1 was used to assemble the same battery as in Example 1, and the assembled battery was tested for high-temperature cycle performance. Test conditions: Before the high-temperature test, the assembled battery is cycled at 25°C for 5 weeks, and then transferred to a constant temperature test box at 60°C for high-temperature cycle test. 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. The cycle specific capacity and Coulombic efficiency of the battery are as follows: figure 2 shown.

Embodiment 3

[0084] The same non-aqueous electrolyte as in Example 1 was used to assemble the same battery as in Example 1, and the assembled battery was tested for high-temperature cycle performance. Test conditions: The assembled battery is directly subjected to a high-temperature formation 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. The cycle specific capacity and Coulombic efficiency of the battery are as follows: image 3 shown.

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Abstract

The present invention provides a non-aqueous electrolyte adopting asymmetric (perfluoroalkylsulfonyl) (polyfluoro alkoxy sulfonyl) lithium imide as an electric conduction salt, wherein the non-aqueous electrolyte has characteristics of high thermal stability, strong oxidation reduction resistance, no aluminum foil corrosion and the like. According to the present invention, in the case of no use of any non-aqueous electrolyte functional additive, the lithium ion battery prepared from an non-aqueous electrolyte adopting LiN(SO2CF3)[SO2OCH(CF3)2](LiTFHFSI) as an electric conduction salt and adopting carbonate, cyclic lactone, or carboxylate and the like as a solvent provides more excellent wide temperature work performances, especially high temperature cycle performance and storage performance, compared with the lithium ion battery prepared from the existing LiPF6 electrolyte; and due to excellent characteristics of high thermal stability, insensitivity to water and the like of the used asymmetric (perfluoroalkylsulfonyl) (polyfluoro alkoxy sulfonyl) imide lithium salt, the non-aqueous electrolyte of the present invention has the advantages.

Description

technical field [0001] The invention belongs to the technical field of new materials and electrochemistry, and in particular relates to a nonaqueous electrolytic solution for lithium ion batteries and its application in lithium ion batteries. Background technique [0002] A rechargeable lithium-ion battery is mainly composed of a positive electrode, a negative electrode, a separator, and a non-aqueous electrolyte between the positive and negative electrodes. The non-aqueous electrolyte plays the role of transporting ions between the positive and negative electrodes of the battery. Its intrinsic properties have an important impact on the capacity, cycle performance, high and low temperature performance, and safety performance of the battery. At present, the commercial secondary lithium battery electrolyte is mainly composed of conductive salt {mainly lithium hexafluorophosphate (LiPF 6 )}, organic carbonate solvent {such as dimethyl carbonate (DMC), diethyl carbonate (DEC), ...

Claims

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Application Information

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IPC IPC(8): H01M10/0566H01M10/0568H01M10/0525
CPCH01M10/0525H01M10/0568Y02E60/10
Inventor 周志彬刘成勇聂进
Owner HUAZHONG UNIV OF SCI & TECH
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