Electrolyte, positive electrode, preparation method thereof, and lithium ion battery

A technology of electrolyte and positive electrode, applied in the field of positive electrode and its preparation, electrolyte, can solve the problems of side reaction, decrease of battery cycle performance, inability to work normally, etc., to achieve the effect of prolonging life and improving cycle performance

Active Publication Date: 2017-11-07
BYD CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At this stage, most lithium battery electrolyte systems can only be used stably at a voltage of 4.2v and below. When the working voltage reaches above 4.2v, the electrolyte system will oxidize and decompose, making the battery unable to work normally. The application of high-voltage cathode materials has formed a great obstacle, and the battery cycle performance is reduced
[0003] The above-mentioned electrolyte also has the technical problem that the electrolyte solvent is prone to side reactions with the positive electrode at a high potential, so that the solvent is further oxidized and decomposed, resulting in excessive consumption of the electrolyte solvent

Method used

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

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preparation example Construction

[0056] The invention provides a method for preparing a positive electrode, comprising:

[0057] (1) Forming a positive electrode material layer on the surface of the positive electrode current collector;

[0058] (2) The electrolytic solution described in any one of claims 1-9 is contacted with the positive electrode material layer surface, and the voltage during contact is 3.5V-4.5V.

[0059] The present invention provides a positive electrode prepared by the above method.

[0060] The preparation method of lithium-ion battery electrolyte is a common method for those skilled in the art, that is, to mix all components (including lithium salt, electrolyte solvent and additives) uniformly, and the method and order of mixing are not particularly limited in the present invention.

[0061] The present invention also provides a lithium-ion battery, comprising a casing, an electric core contained in the casing, and an electrolyte, the electric core includes a positive electrode, a n...

Embodiment 1

[0075] (1) Preparation of electrolyte:

[0076] In an argon glove box, ethylene carbonate (EC), diethyl carbonate (DEC), 12% by weight lithium hexafluorophosphate (LiPF 6 ) is dissolved in the electrolytic solution solvent of 100% weight part, then adds the 4-bromomethylphenylboronic acid pinacolate of 0.1% weight part (the boric acid pinacolate of structure shown in the application formula (1), wherein M is 4 -Bromomethylbenzene obtains the lithium-ion battery electrolyte of the present embodiment, which is denoted as C1;

[0077] (2) Preparation of lithium ion battery:

[0078] The positive active material (LiNi 0.5 mn 1.5 o 4 ), acetylene black, and polyvinylidene fluoride in a ratio of 90:5:5 and then pressed on the aluminum foil to obtain the positive electrode sheet; the metal lithium sheet was used as the negative electrode sheet; the PE / PP composite diaphragm was used as the ion exchange membrane. The electrolyte C1 of the example is made into a button battery S1 ...

Embodiment 2

[0080] Adopt the step identical with embodiment 1 to prepare electrolytic solution and button cell, difference is: in the step (1), replace 4-bromomethylphenylboronic acid pinacolate with the vinylboronic acid pinacolate of 0.5% weight part, Lithium-ion battery electrolyte C2 and button battery S2 were prepared.

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Abstract

The invention provides an electrolyte, a positive electrode, a preparation method thereof, and a lithium ion battery. The electrolyte comprises lithium salts, an electrolyte solvent, and an additive. The additive is boric acid pinacol ester provided by the invention. The electrolyte has the advantages that boric acid pinacol ester is taken as the special additive, can protect the positive electrode, and at the same time, protects the electrolyte solvent from being oxidized and decomposed under a high potential so as to avoid excess consumption. The service life of battery is prolonged under a high voltage.

Description

technical field [0001] The invention belongs to the field of lithium ion batteries, and in particular relates to an electrolyte, a positive electrode, a preparation method thereof and a lithium ion battery. Background technique [0002] Since the 1990s, lithium-ion secondary batteries have developed rapidly from their birth. Generally speaking, a lithium-ion battery with an electrolyte includes a casing, a cell contained in the casing, and an electrolyte. The cell includes a positive electrode, a negative electrode, and a separator between the positive electrode and the negative electrode. During charging, lithium ions migrate from the positive electrode through the electrolyte to the negative electrode, while they flow in the opposite direction during discharging. In recent years, secondary lithium-ion batteries with high energy density have become the object of people's attention. Therefore, people have also noticed some new active materials that can be used as secondary ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0567H01M4/13H01M4/139H01M10/0525H01M10/42
CPCH01M4/13H01M4/139H01M10/0525H01M10/0567H01M10/4235Y02E60/10
Inventor 乔飞燕王圣
Owner BYD CO LTD
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