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Electrolyte, preparation method thereof and lithium ion battery

A lithium-ion battery and electrolyte technology, applied in the field of lithium-ion batteries, can solve problems such as difficult to balance high-temperature performance and low-temperature performance, singleness, etc., and achieve good high-temperature performance and low-temperature performance, as well as the effect of improving interface properties

Active Publication Date: 2021-10-01
SOUTH CHINA NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, traditional lithium-ion batteries often only have good performance at room temperature, or can only be used normally at a single high or low temperature.
When the temperature span of the operating environment is large (such as -10°C to 40°C), it is difficult for traditional lithium-ion batteries to balance good high-temperature performance and low-temperature performance

Method used

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  • Electrolyte, preparation method thereof and lithium ion battery
  • Electrolyte, preparation method thereof and lithium ion battery
  • Electrolyte, preparation method thereof and lithium ion battery

Examples

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preparation example Construction

[0049] Another embodiment of the present invention provides a method for preparing the electrolyte in the above embodiment, the preparation method includes the following steps:

[0050] Mix the lithium salt with an organic solvent to obtain a pre-finished electrolyte;

[0051] Add the additives to the pre-finished electrolyte and mix well.

[0052] In addition to the above embodiments, another embodiment of the present invention provides a lithium-ion battery, which includes a positive pole piece, a negative pole piece, and the electrolyte in the above embodiment or the electrolyte obtained by the above preparation method.

[0053] It can be understood that the positive electrode sheet of the lithium-ion battery in this embodiment includes a positive electrode collector and a positive electrode membrane coated on the surface of the positive electrode collector, and the positive electrode membrane includes a positive electrode active material (ie, the active material of the pos...

Embodiment 1

[0070] (1) Preparation of electrolyte.

[0071] Step 1: at room temperature, mix ethylene carbonate (EC), ethyl methyl carbonate (EMC) and dimethyl carbonate (DMC) according to the mass ratio EC:EMC:DMC=3:5:2 to obtain an organic solvent;

[0072] Step 2: adding lithium hexafluorophosphate into the organic solvent in step 1, controlling the mass percentage of lithium hexafluorophosphate in the electrolyte to 15%, and stirring evenly to obtain a pre-finished electrolyte;

[0073] Step 3: Add the first additive to the pre-finished electrolyte solution obtained in Step 2, control the mass percentage of the first additive in the electrolyte solution to 0.5%, stir evenly, and obtain the electrolyte solution.

[0074] (2) Preparation of lithium-ion batteries.

[0075] Take LiNi 0.5 co 0.2 mn 0.3 o 2 It is the active material of the positive pole piece, and graphite is the active material of the negative pole piece. The electrolyte prepared in this embodiment is mixed with a con...

Embodiment 2

[0077]Compared with Example 1, the difference of this example is that the additive in this example is the second additive, and the mass percentage of the second additive in the electrolyte is 0.5%.

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Abstract

The invention relates to an electrolyte, a preparation method thereof and a lithium ion battery. The electrolyte comprises an organic solvent, a lithium salt and an additive, and the additive is at least one of a first additive and a second additive. Specifically, the first additive is at least one of compounds shown in a formula (I), and the second additive is at least one of compounds shown in a formula (II). When the electrolyte is applied to the lithium ion battery, the high-temperature performance and the low-temperature performance of the lithium ion battery can be effectively improved.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to an electrolyte, a preparation method thereof and a lithium ion battery. Background technique [0002] Lithium-ion batteries have the advantages of high energy density, long cycle life, and the ability to be recycled, making them widely used in digital products, automobiles, aerospace and other fields. With the continuous improvement of consumer demand, consumers have put forward higher requirements for the performance of lithium-ion batteries. For example, consumers hope that lithium-ion batteries can have good performance under different temperature conditions, so as to adapt to the use environment with large temperature difference between day and night, and large temperature difference between north and south. [0003] However, traditional lithium-ion batteries often only have good performance at room temperature, or can only be used normally at a single high tem...

Claims

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Application Information

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IPC IPC(8): H01M10/0567H01M10/0525
CPCH01M10/0567H01M10/0525H01M2300/0025Y02E60/10
Inventor 李伟善关雄聪李梦方伟亮廖友好
Owner SOUTH CHINA NORMAL UNIVERSITY