Electrolyte solution for negative lithium titanate battery, lithium ion battery and preparation method thereof

A negative electrode lithium titanate, lithium ion battery technology, applied in the direction of electrolyte storage battery manufacturing, secondary battery, non-aqueous electrolyte storage battery, etc., can solve the problems of affecting the electrochemical performance of the battery, using a large amount of organic solvents, and hidden dangers of battery safety, etc. Achieve the effect of easy industrialization, inhibition of reduction reaction, and good safety

Active Publication Date: 2013-05-22
CALB CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method uses a large amount of organic solvents, high production costs, pollutes the environment, and damages human health
Therefore, it has become a trend to use water-based binders for both positive and negative electrode materials of lithium-ion batteries. Compared with lithium-ion batteries prepared with organic binders, lithium-ion batteries prepared with water-based binders have superior safety and reliability. Good social benefits, but compared with lithium-ion batteries using organic binders, lithium-ion batteries using water-based binders have a lot of polar groups in the water-based binders, so it is difficult to remove water from the pole pieces, so Batteries are more likely to produce gas, which not only affects the electrochemical performance of the battery, but also brings safety hazards to the battery

Method used

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  • Electrolyte solution for negative lithium titanate battery, lithium ion battery and preparation method thereof
  • Electrolyte solution for negative lithium titanate battery, lithium ion battery and preparation method thereof
  • Electrolyte solution for negative lithium titanate battery, lithium ion battery and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0037] In this embodiment, the electrolyte for lithium ion batteries with lithium titanate as the negative electrode includes the following components in weight percentage: lithium hexafluorophosphate 15%, fluoroethylene carbonate 3%, vinylene carbonate 2% and solvent 80%; among them, the solvent It is made by mixing ethylene carbonate, ethyl methyl carbonate, diethyl carbonate and propylene carbonate in a volume ratio of 1:1:1:0.5.

[0038] The lithium ion battery using the electrolyte in this embodiment includes a positive electrode, a negative electrode, and an electrolyte, wherein the negative electrode includes 85wt.% of single-phase lithium titanate (primary particles are nanoscale), 4wt.% of carbon nanotubes, and 6wt.% .% conductive carbon black, 1.5wt.% sodium carboxymethyl cellulose, 2.5wt.% styrene butadiene rubber and 1wt.% oxalic acid; the positive electrode includes 92.5wt.% LiFePO 4 , 1wt.% carbon nanotubes, 2.5wt.% conductive carbon black and 4wt.% LA132.

[0039] Th...

Embodiment 2

[0049] In this embodiment, the electrolyte for lithium ion batteries using lithium titanate as the negative electrode includes the following components in weight percentage: lithium hexafluorophosphate 10%, lithium bisoxalate borate 2% and solvent 88%; wherein the solvent is ethylene carbonate, methyl ethyl carbonate Ester, diethyl carbonate and propylene carbonate are mixed in a volume ratio of 1:1:1:1.

[0050] The lithium ion battery using the electrolyte in this embodiment includes a positive electrode, a negative electrode, and an electrolyte, wherein the negative electrode includes 94wt.% of modified lithium titanate coated with carbon (primary particles are nano-level), and 3wt.% of Conductive carbon black, 2.5wt.% LA132 and 0.5wt.% sodium carboxymethyl cellulose; positive electrode includes 95wt.% 0.5Li 2 MnO 3 ·0.5LiNi 0.5 Mn 0.5 O 2 , 1wt.% conductive carbon black, 1wt.% conductive graphite, 2wt.% LA132 and 1wt.% sodium carboxymethyl cellulose.

[0051] The method for pre...

Embodiment 3

[0060] In this embodiment, the electrolyte for lithium ion batteries with lithium titanate as the negative electrode includes the following components by weight percentage: lithium hexafluorophosphate 12.5%, lithium bisoxalate borate 1.5%, 1,3-propane sultone 1%, and sodium carbonate Vinyl ester 1% and solvent 84%; the solvent is made by mixing ethylene carbonate, ethyl methyl carbonate, diethyl carbonate and propylene carbonate in a volume ratio of 1:1:1:2.

[0061] In this embodiment, a lithium ion battery using the electrolyte includes a positive electrode, a negative electrode, and an electrolyte, wherein the negative electrode includes a modified lithium titanate (primary particles of nanometer level) with a surface of 89.5wt.% of carbon coated, 3wt. % Conductive carbon black, 2wt.% conductive graphite, 5wt.% LA133 and 0.5wt.% oxalic acid; the positive electrode includes 90wt.% LiNi 1 / 3 Mn 1 / 3 Co 1 / 3 O 2 , 3wt.% conductive carbon black, 2wt.% conductive graphite, 4wt.% LA133 ...

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Abstract

The invention discloses an electrolyte solution for a negative lithium titanate battery, a lithium ion battery and a preparation method thereof. The electrolyte solution is characterized in that lithium hexafluorophosphate is adopted as electrolyte, ethylene carbonate, methyl ethyl carbonate, diethyl carbonate and propylene carbonate are adopted as solvents, and one or more of fluoroethylene carbonate, double oxalate ithium borate, 1,3-propanesultone or vinylene carbonate are adopted as a film-formation additive.

Description

Technical field [0001] The invention relates to an electrolyte for a lithium ion battery using lithium titanate as a negative electrode, and also relates to a lithium ion battery using the electrolyte and a preparation method thereof, and belongs to the technical field of lithium ion battery energy. Background technique [0002] With the continuous progress and development of lithium-ion battery technology, the life and safety of the battery have attracted more and more attention. In recent years, spinel lithium titanate (Li 4 Ti 5 O 12 ) Due to the higher lithium insertion and release potential (1.55Vvs.Li + / Li) and higher lithium ion diffusion coefficient (2×10 -8 cm 2 / s), which can avoid the deposition of lithium ions on the surface of the carbon negative electrode when the battery is overcharged, charged with high current or at low temperatures. Therefore, the lithium ion battery with lithium titanate as the negative electrode has high safety and is expected to be used in po...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0567H01M10/0525H01M10/058
CPCY02E60/122Y02E60/10Y02P70/50
Inventor 王洪波随东
Owner CALB CO LTD
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