Electrolyte and secondary battery

Patent metadata

Field	Value
Publication number	US-10826121-B2
Application number	US-201815891197-A
Country	US
Kind code	B2
Filing date	Feb 7, 2018
Priority date	Feb 7, 2017
Publication date	Nov 3, 2020
Grant date	Nov 3, 2020

Abstract

The present disclosure provides an electrolyte and a secondary battery. The electrolyte comprises: a non-aqueous organic solvent; an electrolyte salt dissolved in the non-aqueous organic solvent; and an additive dissolved in the non-aqueous organic solvent. The additive comprises a first additive, the first additive is selected from boron phosphate represented by formula 1. When the electrolyte of the present disclosure is applied in the secondary battery, the performances of the secondary battery under high temperature environment can be effectively improved.

First claim

What is claimed is:

1. An electrolyte, comprising:
a non-aqueous organic solvent;
an electrolyte salt dissolved in the non-aqueous organic solvent; and
an additive dissolved in the non-aqueous organic solvent;
the additive comprising a first additive, the first additive being selected from boron phosphate represented by formula 1;

and the additive further comprising a second additive, the second additive being C—C double bond-containing cyclic carbonate ester, wherein the C—C double bond-containing cyclic carbonate ester is one or more selected from the group consisting of compounds represented by formula 10, R 33 ˜R 34 are independently selected from the group consisting of H, halogen atom, substituted or unsubstituted C1˜C10 alkyl, substituted or unsubstituted C2˜C10 alkenyl, substituted or unsubstituted C2˜C10 alkynyl and substituted or unsubstituted C6˜C10 aryl;

wherein a mass of the second additive is 0.01%˜5% of a total mass of the electrolyte.

2. The electrolyte according to claim 1 , wherein the second additive is:

3. The electrolyte according to claim 1 , wherein a mass of the first additive is 0.01%˜5% of a total mass of the electrolyte.

4. The electrolyte according to claim 1 , wherein the non-aqueous organic solvent comprises:
one or more selected from a group consisting of ethylene carbonate, propylene carbonate, 2,3-butylene carbonate, γ-butyrolactone and fluoroethylene carbonate; and
one or more selected from a group consisting of dimethyl carbonate, diethyl carbonate, dipropyl carbonate, ethyl methyl carbonate, methyl propyl carbonate, ethyl propyl carbonate, methyl formate, ethyl formate, propyl formate, methyl acetate, ethyl acetate, propyl acetate, methyl propionate, ethyl propionate and propyl propionate.

5. The electrolyte according to claim 1 , wherein a molar concentration of the electrolyte salt in the electrolyte is 0.01 mol/L˜3 mol/L.

6. A secondary battery comprising an electrolyte, the electrolyte comprising:
a non-aqueous organic solvent;
an electrolyte salt dissolved in the non-aqueous organic solvent; and
an additive dissolved in the non-aqueous organic solvent;
the additive comprising a first additive, the first additive being selected from boron phosphate represented by formula 1;

and the additive further comprising a second additive, the second additive being C—C double bond-containing cyclic carbonate ester, wherein the C—C double bond-containing cyclic carbonate ester is one or more selected from the group consisting of compounds represented by formula 10, R 33 ˜R 34 are independently selected from the group consisting of H, halogen atom, substituted or unsubstituted C1˜C10 alkyl, substituted or unsubstituted C2˜C10 alkenyl, substituted or unsubstituted C2˜C10 alkynyl and substituted or unsubstituted C6˜C10 aryl;

wherein a mass of the second additive is 0.01%˜5% of a total mass of the electrolyte.

7. The secondary battery according to claim 6 , wherein the second additive is:

8. The secondary battery according to claim 6 , wherein a mass of the first additive is 0.01%˜5% of a total mass of the electrolyte.

9. The secondary battery according to claim 6 , wherein the non-aqueous organic solvent comprises:
one or more selected from a group consisting of ethylene carbonate, propylene carbonate, 2,3-butylene carbonate, γ-butyrolactone and fluoroethylene carbonate; and
one or more selected from a group consisting of dimethyl carbonate, diethyl carbonate, dipropyl carbonate, ethyl methyl carbonate, methyl propyl carbonate, ethyl propyl carbonate, methyl formate, ethyl formate, propyl formate, methyl acetate, ethyl acetate, propyl acetate, methyl propionate, ethyl propionate and propyl propionate.

10. The secondary battery according to claim 6 , wherein a molar concentration of the electrolyte salt in the electrolyte is 0.01 mol/L˜3 mol/L.

Assignees

• Contemporary Amperex Technology Co Ltd

Inventors

• Ju Feng
• Feng Shaowei
• Han Changlong
• Zhou Xiaochong
• Zhang Ming

Classifications

• H01M2300/0025

  Organic electrolyte · CPC title

• H01M10/0569

  characterised by the solvents · CPC title

• H01M10/0567 Primary

  characterised by the additives · CPC title

• H01M10/0525

  Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries · CPC title

• Y02E60/10

  Energy storage using batteries · CPC title