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Electrolyte and lithium battery

An electrolyte and lithium battery technology, applied in the field of electrochemistry, to achieve the effect of slowing down the breakage, optimizing the SEI of the negative electrode, and increasing the energy density

Pending Publication Date: 2021-09-03
HUNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In summary, another purpose of the present invention is to provide an electrolyte and a lithium battery; at least it can solve the problem of how to increase the working voltage of the positive electrode of the lithium battery while suppressing the growth of lithium dendrites on the negative electrode of the lithium battery, and then solve how to simultaneously optimize the lithium battery. The performance of the positive and negative electrodes of lithium batteries can improve the electrochemical performance of lithium batteries under high-voltage working conditions

Method used

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  • Electrolyte and lithium battery
  • Electrolyte and lithium battery
  • Electrolyte and lithium battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0052] This example is used to illustrate the electrolyte solution disclosed in the present invention.

[0053] In the glove box (H 2 O2 6 ), which is dissolved in an organic solution to obtain a base electrolyte.

[0054] Lithium salt concentration: 1M lithium hexafluorophosphate (LiPF 6 );

[0055] Non-aqueous organic solvent: ethylene carbonate (EC): a mixed solvent of dimethyl carbonate (DMC)=1:1 (v:v);

[0056] Add an organic compound with a mass fraction of 0.2% to the base electrolyte, and stir evenly to obtain electrolyte 1, wherein the structure of the organic compound is:

[0057]

Embodiment 2

[0059] The electrolyte solution was configured according to the method of Example 1, except that an organic compound with a mass fraction of 0.5% was added to the base electrolyte solution to obtain electrolyte solution 2.

Embodiment 3

[0061] The electrolyte solution was configured according to the method of Example 1, except that an organic compound with a mass fraction of 1% was added to the base electrolyte solution to obtain electrolyte solution 3 .

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Abstract

The invention discloses an electrolyte and a lithium battery, and the electrolyte comprises a lithium salt, a non-aqueous organic solvent and an additive; the additive comprises an organic compound represented by the following structural formula shown in the description, wherein R1, R2 and R3 are respectively and independently selected from alkane groups with the carbon atom number of 1-3. The invention at least can solve the problem of how to improve the working voltage of the positive electrode of the lithium battery while inhibiting the growth of the lithium dendrites of the negative electrode of the lithium battery, and further can solve the problem of how to optimize the performance of the positive electrode and the negative electrode of the lithium battery at the same time, so the electrochemical performance of the lithium battery under the high-voltage working condition can be improved.

Description

technical field [0001] The present invention relates to the field of electrochemistry. More specifically, the present invention relates to electrolyte solutions and lithium batteries. Background technique [0002] Lithium-ion batteries are favored because of their advantages such as no memory effect, environmental protection, and long cycle life. However, in recent years, due to the rapid development of communications, consumer electronics and electric vehicles, the energy density of traditional lithium-ion batteries has been difficult to meet the market demand. In order to increase the energy density of the battery, it is necessary to simultaneously improve the performance of the positive and negative electrodes. However, the current positive and negative electrodes always have more or less defects. In the field of lithium batteries, it is still difficult to take into account the electrochemical performance of the positive and negative electrodes at the same time. [000...

Claims

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Application Information

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IPC IPC(8): H01M10/0567H01M10/0566H01M10/0525
CPCH01M10/0567H01M10/0566H01M10/0525Y02E60/10
Inventor 马建民戚世瀚
Owner HUNAN UNIV
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