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Novel lithium salt additive and non-aqueous electrolyte for lithium-ion batteries

A non-aqueous electrolyte and lithium-ion battery technology, applied in the field of lithium-ion batteries, can solve problems such as high-temperature gas production, low-temperature lithium precipitation of lithium difluorophosphate, and difficulty in both high and low temperature performance

Active Publication Date: 2019-10-01
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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  • Novel lithium salt additive and non-aqueous electrolyte for lithium-ion batteries
  • Novel lithium salt additive and non-aqueous electrolyte for lithium-ion batteries
  • Novel lithium salt additive and non-aqueous electrolyte for lithium-ion batteries

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] (1) Preparation of electrolyte:

[0023] Under argon atmosphere, the electrolyte is prepared in a vacuum glove box with a moisture content of 6 The concentration of the 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.

[0024] (2) Preparation of positive electrode sheet: Li[Ni 0.5 mn 0.2 co 0.3 ]O 2 : PVDF:SP=95:1:4 mixed evenly with 1-methyl-2-pyrrolidone, coated the mixed slurry on both sides of the aluminum foil, dried and rolled to obtain the positive electrode sheet.

[0025] (3) Preparation of negative pole piece: Dissolve graphite: SP: CMC: SBR = 95: 1.5: 1.0: 2.5 in the aqueous solution, mix evenly, apply the mixed slurry on both sides of th...

Embodiment 2～9 and comparative example 1

[0032] 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:

[0033] 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.

[0034] The specific test method is consistent with that of Example 1, and the test results are shown in Table 2.

[0035] The electrolyte composition of table 1 embodiment and comparative example

[0036]

[0037]

[0038] Table 2 Test results

[0039]

[0040] Comparing the test results of Examples 1 to 9 and Comparative Example 1, it can be seen that the bicyclic phosphoric acid amide lithium salt compound or the bicyclic phosphoric acid amide lithium salt compound shown in structural formula 1 and PS, LiPO 2 f 2 T...

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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, a novel additive and other conventional additives. The novel additive is a dicyclophosphimide lithium salt or lithium dicyclothiophosphimide lithium salt compound shown in a structural formula 1. The compound shown in structural formula 1 of the invention has a high reduction potentialwhen used as an electrolyte additive, so that the novel additive can participate in the formation of a solid electrolyte film on the surface of a negative electrode in preference to the conventional additives and improve the composition of the interfacial film. Because the additive has a cyclic phosphate structure, the phosphorus-oxygen bond is easy to break under high voltage, and the additive can participate in the formation of a positive electrolyte film and improve the interface stability of the positive electrode material. Therefore, the introduction of the additive can 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 l...

Claims

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Application Information

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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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