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Electrolyte for lithium battery, preparation method of electrolyte and lithium battery

A lithium battery and electrolyte technology, applied in the field of lithium battery electrolyte and its preparation, can solve the problem of low charge and discharge times, achieve high lithium conductivity, improve cycle stability and safety performance, and inhibit lithium dendrite growth Effect

Pending Publication Date: 2022-08-02
HUNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a kind of electrolyte solution for lithium battery, solve the problem of low charging and discharging times of existing lithium battery

Method used

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  • Electrolyte for lithium battery, preparation method of electrolyte and lithium battery
  • Electrolyte for lithium battery, preparation method of electrolyte and lithium battery
  • Electrolyte for lithium battery, preparation method of electrolyte and lithium battery

Examples

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preparation example Construction

[0040] A preparation method of the above-mentioned lithium battery electrolyte, comprising the following steps:

[0041] S1. In the glove box, H 2 O2 <0.1ppm, take an appropriate amount of lithium salt and dissolve it in the non-aqueous organic solution, and the concentration of the lithium salt is 1M to obtain the parent electrolyte;

[0042] S2, adding an additive whose mass percentage is 0.5-2.0 wt % in the parent electrolyte, and stirring evenly to obtain an electrolyte for a lithium battery.

[0043] A lithium battery containing the above-mentioned electrolyte for a lithium battery comprises a battery case, a positive electrode, a negative electrode, a separator and an electrolyte located in the battery case.

[0044] The positive electrode includes a positive electrode current collector and a positive electrode material on the positive electrode current collector, the positive electrode material including a positive electrode active material.

[0045] Alternatively, th...

Embodiment 1

[0051] in the glove box (H 2 O2 6 ), which was dissolved in a non-aqueous organic solution to obtain the parent electrolyte.

[0052] Lithium salt concentration: 1M lithium hexafluorophosphate (LiPF 6 );

[0053] Non-aqueous organic solvent: mixed solvent of ethylene carbonate (EC): dimethyl carbonate (DMC)=1:1 (v:v);

[0054] Adding 1.0wt% n-hexylboronic acid R to the parent electrolyte 2 The compound shown was uniformly stirred to obtain the implementation electrolyte solution 1.

Embodiment 2

[0056] The electrolyte is prepared by the method described in Example 1, the difference is that n-propylboronic acid R with a mass fraction of 1.0 wt% is added to the parent electrolyte. 1 , the implementation of electrolyte 2 was obtained.

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Abstract

The invention discloses an electrolyte for a lithium battery, which comprises a lithium salt, a non-aqueous organic solvent and an additive, the additive is alkyl boric acid, and the weight percentage content of the additive is 0.5-2.0 wt%. The alkyl boric acid is one or a mixture of several of n-propyl boric acid, n-hexyl boric acid and n-octyl boric acid. The invention also discloses a preparation method of the electrolyte for the lithium battery and the lithium battery prepared by adopting the electrolyte. According to the electrolyte for the lithium battery, the preparation method of the electrolyte and the lithium battery, the problem that an existing lithium battery is low in charging and discharging frequency can be solved, and the electrolyte has the advantages of being good in cycling stability and slow in specific capacity attenuation.

Description

technical field [0001] The invention relates to the technical field of lithium batteries, in particular to an electrolyte for a lithium battery, a preparation method thereof, and a lithium battery. Background technique [0002] Lithium batteries have the advantages of green environmental protection, no memory effect, relatively high energy density, etc., and are welcomed by the energy storage equipment market. Energy density refers to the energy that can be stored / released per unit mass or unit volume of lithium battery, and is one of the important indicators to measure battery quality. Generally, vehicle power batteries need to have high energy density. Common methods to improve the energy density of batteries include increasing the positive electrode voltage and increasing the electrode specific capacity. [0003] At present, most commercial lithium batteries use graphite as the negative electrode, but the theoretical specific capacity of the graphite negative electrode ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0566H01M10/0567H01M10/0569H01M10/052
CPCH01M10/0566H01M10/0567H01M10/052H01M10/0569H01M2300/0025H01M2300/0037Y02E60/10
Inventor 马建民戚世瀚
Owner HUNAN UNIV
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