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Non-aqueous electrolyte, battery containing non-aqueous electrolyte and electric vehicle

A non-aqueous electrolyte, content technology, applied in the direction of non-aqueous electrolytes, batteries, secondary batteries, etc., can solve the problem of not being able to meet the stability requirements of positive electrode materials

Active Publication Date: 2019-11-29
BYD CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In recent years, it has been reported that propylene sulfite (PS) has a certain film-forming effect on both positive and negative electrodes, but the battery system can only be stabilized at 4.35V, which cannot meet the stability requirements of positive electrode materials at high potentials.

Method used

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  • Non-aqueous electrolyte, battery containing non-aqueous electrolyte and electric vehicle
  • Non-aqueous electrolyte, battery containing non-aqueous electrolyte and electric vehicle
  • Non-aqueous electrolyte, battery containing non-aqueous electrolyte and electric vehicle

Examples

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preparation example Construction

[0043] The preparation method of the non-aqueous electrolytic solution provided by the present invention is a method routinely used by those skilled in the art, that is, to mix the components (including lithium salts, organic solvents and additives) uniformly. There are no special restrictions. For example, the organic solvent is now mixed evenly, then the lithium salt is added and mixed evenly, and then the additive is added and mixed evenly, and the auxiliary additive can be added together with the additive.

[0044] The invention also provides a battery, which comprises a battery casing, an electric core and a non-aqueous electrolyte sealed in the battery casing.

[0045] Wherein, the non-aqueous electrolyte is the above-mentioned non-aqueous electrolyte; the cell includes a positive electrode, a negative electrode and a diaphragm. Because the present invention only relates to the improvement to prior art battery non-aqueous electrolyte, therefore other composition and the...

Embodiment 1

[0049] (1) Preparation of non-aqueous electrolyte

[0050] Configure the electrolyte in the glove box, control the oxygen content in the glove box, <2ppm, fill the glove box with nitrogen and control the purity of nitrogen in the glove box to be 99.999%, ethylene carbonate (EC), ethyl methyl carbonate ( EMC) According to the mass ratio EC:EMC=3:7, mix evenly to obtain an organic solvent, add an appropriate amount of conductive lithium salt LiPF6 to the above solution, the concentration of the lithium salt is 1.0mol / L, stir evenly, and use non-aqueous electrolysis Based on the total mass of liquid (including lithium salt, additives and organic solvents), 2.5wt.% ethylene carbonate (VC), 1.5wt.% ethylene carbonate (VEC) and 3wt.% fluorocarbonic acid were added Vinyl ester (FEC) and carry out impurity removal and water removal treatment to obtain the basic electrolyte; based on the total mass of the non-aqueous electrolyte, add 2wt% of the additives described in the present inven...

Embodiment 2

[0055] Adopt the same method as Example 1 to prepare non-aqueous electrolyte C2 and battery S2, the difference is that when preparing the non-aqueous electrolyte, the added additive of the present invention is 5-phenyl-1,3, 2,4-dioxathiazole-2-oxide, whose structural formula is

[0056]

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PUM

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Abstract

The invention discloses a non-aqueous electrolyte, a battery containing the non-aqueous electrolyte and an electric vehicle. The non-aqueous electrolyte comprises a lithium salt, an organic solvent and an additive containing dioxazole oxides, the electrolyte is applied to the battery, the additive has the good positive electrode film-forming property, the reaction between a positive electrode material and the organic electrolyte is effectively hindered and inhibited, the cycle performance of a positive electrode active substance at a high voltage of 4.4V is improved, and finally, the cycle life and the rate capability of the lithium ion battery are improved.

Description

technical field [0001] The invention relates to the field of non-aqueous electrolytes, in particular to a non-aqueous electrolyte, a battery containing the non-aqueous electrolyte and an electric vehicle containing the battery. Background technique [0002] Film-forming additives are a very important category of electrolyte additives. The use of ethylene carbonate, fluoroethylene carbonate, etc. in negative electrode film-forming additives has been relatively mature. The understanding of positive electrode film-forming additives is relatively late. At present, it is believed that some benzene-based compounds, heterocyclic compounds, and silanes are mainly effective for positive electrode film-forming. But there are almost no real industrial applications. In recent years, it has been reported that propylene sulfite (PS) has a certain film-forming effect on both the positive and negative electrodes, but the battery system can only be stable at 4.35V, which cannot meet the st...

Claims

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Application Information

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IPC IPC(8): H01M10/0567H01M10/0525
CPCH01M10/0525H01M10/0567H01M2220/20H01M2300/0025Y02E60/10
Inventor 张百爽周青官向国
Owner BYD CO LTD
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