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Electrolyte and lithium ion battery containing electrolyte

An electrolyte and lithium salt technology, applied in secondary batteries, circuits, electrical components, etc., can solve problems such as high viscosity, impact on battery performance, difficulty in infiltration of pole pieces and diaphragms, etc., to improve thermal stability and thermal stability Good performance and improved cycle performance

Inactive Publication Date: 2016-08-03
NINGDE AMPEREX TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to its high viscosity, it is difficult to infiltrate the pole piece and diaphragm, especially under high compaction density, which has an adverse effect on the performance of the battery cell.

Method used

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  • Electrolyte and lithium ion battery containing electrolyte
  • Electrolyte and lithium ion battery containing electrolyte
  • Electrolyte and lithium ion battery containing electrolyte

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0169] The preparation of embodiment 1 lithium ion battery

[0170] In Comparative Example 1 # ~6 # As in Examples 1-10, the lithium-ion battery (hereinafter referred to as the battery) is prepared according to the following method:

[0171] (1) Preparation of positive electrode sheet

[0172] Lithium cobalt oxide (LiCoO 2 ), the binder polyvinylidene fluoride, and the conductive agent acetylene black are LiCoO in weight ratio 2 : polyvinylidene fluoride: acetylene black = 96:2:2 for mixing, then add N-methylpyrrolidone (NMP), then stir under the action of a vacuum mixer until the system becomes uniform and transparent, and obtain the positive electrode slurry; the positive electrode slurry The material was uniformly coated on an aluminum foil with a thickness of 12 μm; the aluminum foil was dried at room temperature and then transferred to an oven at 120° C. for 1 hour, and then cold-pressed and cut to obtain positive electrodes.

[0173] (2) Preparation of negative elec...

Embodiment 2

[0212] Electrolyte and lithium-ion battery were prepared according to the method of Example 1, the difference being that the composition of additives in the electrolyte was as shown in Table 4;

[0213] Table 4

[0214]

[0215]

[0216] The lithium-ion battery was prepared by using the electrolyte in Table 4, and the properties of the prepared battery were similar to those of Example 1, and will not be repeated due to space limitations.

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Abstract

The invention relates to the technical field of lithium ion batteries, in particular to an electrolyte and a lithium ion battery containing the electrolyte .The electrolyte comprises lithium salt, organic solvent and additives, wherein the additives include a dimerization ester compound and a dinitrile compound containing an ether bond, and the dimerization ester compound includes carbonic acid ester dimer, carboxylic acid ester dimer and sulfonated lactone dimer .The electrolyte can improve the cycle performance, rate capability and high-temperature memory performance of the lithium ion battery on high voltage.

Description

technical field [0001] The present application relates to the technical field of lithium-ion batteries, in particular, to an electrolyte and a lithium-ion battery including the electrolyte. Background technique [0002] In recent years, with the rapid development of electronic products, higher requirements have been placed on the endurance of lithium-ion batteries. The main factor determining the endurance of lithium-ion batteries is battery capacity. Higher requirements have also been put forward. In order to improve the energy density of lithium-ion batteries, the development of high-voltage lithium-ion batteries is one of the effective methods. However, as the voltage increases, the reaction between the water in the electrolyte and other components in the electrolyte will be accelerated, and hydrofluoric acid (HF) will be generated, which will reduce the cycle performance of the lithium-ion battery and seriously affect the lithium-ion battery. performance. Improving the...

Claims

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Application Information

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IPC IPC(8): H01M10/0567H01M10/0525
CPCH01M10/0525H01M10/0567Y02E60/10
Inventor 王可飞
Owner NINGDE AMPEREX TECH
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