Non-aqueous electrolyte solution and lithium ion battery using same

A non-aqueous electrolyte, electrolyte technology, applied in secondary batteries, circuits, electrical components, etc., can solve the problems of low temperature performance and cycle performance, low temperature resistance, propylene carbonate intercalation damage and other problems, to achieve cycle performance Good, good low temperature performance

Inactive Publication Date: 2012-01-25
BYD CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The present invention aims to solve the technical problems of the non-aqueous electrolyte provided in the prior art, such as large low-temperature impedance, unstable SEI film, and graphite intercalation damage by propylene carbonate, whi

Method used

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  • Non-aqueous electrolyte solution and lithium ion battery using same
  • Non-aqueous electrolyte solution and lithium ion battery using same
  • Non-aqueous electrolyte solution and lithium ion battery using same

Examples

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Example Embodiment

[0021] The invention also provides a method for preparing non-aqueous electrolyte

[0022] The method includes mixing an organic solvent with an additive, and then adding a lithium salt to obtain a non-aqueous electrolyte. The additive is one or more of hydrogenated thiophenes having the following structures:

[0023]

[0024] A and B are independently selected from one of amino group, alkyl group, halogen, and ester group. In the process of preparing non-aqueous electrolyte, based on the total weight of non-aqueous electrolyte, lithium salt, organic solvent and additives The weight ratio of lithium salt is 3-20:70-90:0.5-10; in a preferred case, the weight ratio of lithium salt, organic solvent and additive is 5-15:70-85:0.5-5.

[0025] The detailed steps are to first combine ethyl methyl carbonate, dimethyl carbonate, diethyl carbonate, ethylene carbonate, propylene carbonate, butylene carbonate, vinyl sulfite, propylene sulfite, diethyl sulfite, γ -One or more of butyrolactone, d...

Example Embodiment

[0027] Example 1

[0028] This embodiment is used to illustrate the non-aqueous electrolyte provided by the present invention, a preparation method thereof, and a lithium ion battery using the non-aqueous electrolyte.

[0029] 1) Preparation of non-aqueous electrolyte: based on the total weight of the non-aqueous electrolyte, put 30 parts of propyl carbonate (PC), 40 parts of ethyl butyrate (EB), and 30 parts of dimethyl carbonate (DMC) The high mixer mixes for 1 hour at a speed of 50r / min to make a mixed organic solvent, and then adds 18 parts of lithium salt LiPF 6 , And then add 0.5% 2-aminohydrothiophene and 0.3% 2-fluorohydrothiophene based on the total weight of the non-aqueous electrolyte, and stir for 2h at a stirring speed of 50r / min to prepare the desired The non-aqueous electrolyte sample A1.

[0030] 2) Preparation of negative electrode: natural graphite, conductive agent acetylene black, binder PVDF (Atofina Company, 761#PVDF) in solvent N-methyl-2-pyrrolidone in a cert...

Example Embodiment

[0033] Example 2

[0034] This embodiment is used to illustrate the non-aqueous electrolyte provided by the present invention, a preparation method thereof, and a lithium ion battery using the non-aqueous electrolyte.

[0035] 1) Preparation of non-aqueous electrolyte: based on the total weight of the non-aqueous electrolyte, put 30 parts of propyl carbonate (PC), 40 parts of ethyl butyrate (EB), and 30 parts of dimethyl carbonate (DMC) The high mixer mixes for 1 hour at a speed of 50r / min to make a mixed organic solvent, and then adds 18 parts of lithium salt LiPF 6 , Then add 1.5wt% 2-aminohydrothiophene and 0.9% 2-fluorohydrothiophene based on the total weight of the non-aqueous electrolyte, and after stirring for 2 hours, the required non-aqueous electrolyte sample A2 is prepared.

[0036] 2) Preparation of negative electrode: natural graphite, conductive agent acetylene black, binder PVDF (Atofina Company, 761#PVDF) in solvent N-methyl-2-pyrrolidone in a certain ratio of 100:8:5...

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Abstract

The invention provides non-aqueous electrolyte solution and a lithium ion battery using the same. The non-aqueous electrolyte solution contains lithium salt, organic solvent and additives. The additives are one or several kinds of hydrogen thiophene with the following structure as shown in the accompanying drawing, wherein A and B are respectively and independently selected from one of amino group, alkyl group, halogen and ester group. The invention additionally provides the lithium ion battery, which comprises a cell, non-aqueous electrolyte solution and a shell, wherein the cell comprises an anode, a cathode and an isolating membrane which is arranged between the anode and the cathode, the cell and the non-aqueous electrolyte solution are contained in the shell and the electrolyte solution is the non-aqueous electrolyte solution provided by the invention.

Description

technical field [0001] The invention belongs to the field of lithium ion batteries, and relates to a nonaqueous electrolytic solution for lithium ion batteries and a lithium ion battery using the nonaqueous electrolytic solution. Background technique [0002] After entering the 21st century, with the increasing awareness of energy crisis and environmental protection, clean energy has become more and more popular and valued by people. Lithium-ion batteries have won people's favor with their unique advantages. Lithium-ion batteries have the characteristics of high working voltage, no memory, low self-discharge, and high energy density. They will gradually replace nickel-hydrogen and nickel-cadmium batteries and become the preferred energy source for various electronic products. In recent years, the launch of electric vehicles and other products has led to a research boom in lithium-ion batteries, and the country has also continuously introduced some new policies to promote the...

Claims

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Application Information

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IPC IPC(8): H01M10/0567H01M10/0525
CPCY02E60/122Y02E60/10
Inventor 王圣陈辉
Owner BYD CO LTD
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