A kind of lithium salt additive and its lithium ion battery non-aqueous electrolyte

A lithium-ion battery and non-aqueous electrolyte technology, applied in the field of lithium-ion batteries, can solve the problems of LiFSI corroding aluminum foil, difficulty in balancing high and low temperature performance, and short high-temperature cycle life

Active Publication Date: 2021-10-08
ZHUHAI SMOOTHWAY ELECTRONICS MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these additives usually have problems such as difficulty in balancing high and low temperature performance, short cycle life at high temperature, and poor safety performance. The phenomenon of lithium, etc.

Method used

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  • A kind of lithium salt additive and its lithium ion battery non-aqueous electrolyte
  • A kind of lithium salt additive and its lithium ion battery non-aqueous electrolyte
  • A kind of lithium salt additive and its lithium ion battery non-aqueous electrolyte

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] (1) Preparation of electrolyte:

[0025] Under argon atmosphere, the electrolyte is prepared in a vacuum glove box with a moisture content of 6 The concentration of lithium salt is 1.0mol / L, the content of PS is 2% of the total weight of the electrolyte, the content of lithium difluorophosphate is 1% of the total weight of the electrolyte, and the bimolecular phosphoric acid amide lithium salt added with 1% by weight is named as Compound 1 was uniformly mixed to obtain the lithium ion electrolyte solution of the present invention.

[0026] (2) Preparation of positive electrode sheet: Li[Ni 0.5 mn 0.2 co 0.3 ]O 2 : PVDF:SP=95:1:4 Mix evenly with 1-methyl-2-pyrrolidone, coat the mixed slurry on both sides of the aluminum foil, dry and roll to obtain the positive electrode sheet.

[0027] (3) Preparation of negative pole piece: Dissolve graphite: SP: CMC: SBR=95:1.5:1.0:2.5 in aqueous solution, mix evenly, coat both sides of copper foil with the mixed slurry, and dry ...

Embodiment 2～9 and comparative example 1

[0034] This embodiment is used to illustrate the lithium-ion battery non-aqueous electrolyte disclosed by the present invention and its preparation method, including most of the operating steps in Example 1, the difference being:

[0035] In the preparation step of the non-aqueous electrolytic solution, the non-aqueous electrolytic solution is added with the components shown in the mass percentages of Examples 2-9 or Comparative Example 1 in Table 1.

[0036] The specific test method is consistent with that of Example 1, and the test results are shown in Table 2.

[0037] The electrolyte composition of table 1 embodiment and comparative example

[0038] main solvent additive lithium salt Example 1 EC:EMC:DEC=2:5:3 PS 2%; LiPO 2 f 2 1%; Compound 1 1%

1.0mol / L Example 2 EC:EMC:DEC=2:5:3 PS 2%; LiPO 2 f 2 1%; Compound 2 1%

1.0mol / L Example 3 EC:EMC:DEC=2:5:3 PS 2%; LiPO 2 f 2 1%; compound 3 1%

1.0mol / L Exam...

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PUM

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Abstract

The invention provides a lithium ion battery electrolyte, which is composed of an organic solvent, lithium salt, new additives and other conventional additives. The novel additive is lithium salt of bicyclic phosphoroamidide or lithium salt of bicyclic thiophosphoroxidide shown in structural formula 1. In the present invention, when the compound shown in structural formula 1 is used as an electrolyte additive, its reduction potential is higher, so it can participate in the generation of a solid electrolyte film on the surface of the negative electrode in preference to conventional additives, and improve the composition of the interface film; It has a cyclic phosphate ester structure, and the phosphorus-oxygen bond is easily broken under high voltage, so it can participate in the formation of the positive electrode electrolyte membrane and improve the interface stability of the positive electrode material. Therefore, the introduction of such additives can effectively improve the high-temperature performance, low-temperature performance and cycle performance of lithium-ion batteries.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to a lithium ion battery non-aqueous electrolyte and a lithium ion battery. Background technique [0002] In recent years, lithium-ion batteries have been widely used in 3C digital, power vehicles, energy storage devices and other fields. With the rapid development of science and technology today, people's requirements for lithium-ion batteries are constantly increasing, such as longer life, higher energy density, better high and low temperature performance and safety performance. Battery materials are one of the key technologies to improve the performance of lithium-ion batteries. Among them, the electrolyte, as one of the four main materials of the battery, has a great impact on the cycle performance, high temperature performance, low temperature performance and safety performance of the battery. The development of various functional additives for lithi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/0567H01M10/0525
CPCH01M10/0525H01M10/0567H01M2300/0025Y02E60/10
Inventor 黄秋洁毛冲王霹霹梁洪耀戴晓兵
Owner ZHUHAI SMOOTHWAY ELECTRONICS MATERIALS
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