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Lithium ion battery additive, lithium ion battery containing lithium ion battery additive and preparation method of lithium ion battery

A lithium-ion battery and additive technology, applied in secondary batteries, circuits, electrical components, etc., can solve the problems of low initial Coulombic efficiency, consumption of active lithium ions, etc., and achieve the effect of improving reversible capacity

Active Publication Date: 2016-10-26
CONTEMPORARY AMPEREX TECH CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, electrochemical film formation will consume active lithium ions, resulting in low initial Coulombic efficiency.

Method used

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  • Lithium ion battery additive, lithium ion battery containing lithium ion battery additive and preparation method of lithium ion battery
  • Lithium ion battery additive, lithium ion battery containing lithium ion battery additive and preparation method of lithium ion battery
  • Lithium ion battery additive, lithium ion battery containing lithium ion battery additive and preparation method of lithium ion battery

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0055] The present application also relates to the preparation method of the lithium ion battery, comprising adding the additive in the following manner:

[0056] Step 1, dissolving the additive described in the present application in the first organic solvent to obtain solution A, and dissolving the lithium salt in the second organic solvent to obtain solution B;

[0057] Step 2, injecting solution A into the lithium-ion battery; and

[0058] Step 3, inject solution B into the lithium-ion battery.

[0059] The present application has found through research that directly adding polyvinylpyrrolidone compounds to organic solvents containing lithium salts will lead to the precipitation of polyvinylpyrrolidone compounds, so it is necessary to add Solution B containing lithium salt. Under the action of lithium salt, polyvinylpyrrolidone compounds are precipitated to form a film, which is coated on the surface of the electrode sheet and separator, and provides a skeleton for the s...

Embodiment 1～6

[0070] (1) Preparation of positive electrode sheet for lithium ion battery

[0071] The positive electrode active material lithium nickel cobalt manganese oxide (LiNi 0.6 co0.2 mn 0.2 o 2 ), the conductive agent Super-P, and the binder polyvinylidene fluoride (PVDF) were dissolved in the solvent N-methylpyrrolidone at a mass ratio of 97.2:1.3:1.5 and mixed evenly to make a positive electrode slurry, and then the positive electrode slurry was evenly coated Spread on the front and back sides of the current collector aluminum foil, the coating amount is 0.0102g / cm 2 , followed by drying at 85°C, cold pressing, trimming, cutting, and stripping, and then drying at 85°C under vacuum for 4 hours, welding the tabs, and making the positive electrode sheet of the lithium-ion battery.

[0072] (2) Preparation of the negative electrode sheet of the lithium-ion battery

[0073] Negative active material artificial graphite, conductive agent Super-P, thickener carboxymethyl cellulose (CM...

Embodiment 7～11

[0100] Electrolyte and the lithium-ion battery containing the electrolytic solution are prepared according to the method of Example 1, the difference is: the compound structural formula and the addition ratio of the additive in the electrolytic solution are as shown in Table 2, and the ratio of the additive is based on its ratio in the electrolytic solution content calculation.

[0101] Table 2

[0102]

[0103]

[0104] The performance of the prepared batteries was tested according to the method in Example 1, and the performances of batteries 7-11 were similar to those of the above examples, and will not be repeated due to space limitations.

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Abstract

The invention relates to the field of lithium ion batteries and concretely relates to a lithium ion battery additive, a lithium ion battery containing the lithium ion battery additive and a preparation method of the lithium ion battery. The lithium ion battery additive comprises at least one polyvinylpyrrolidone compound selected from compounds shown in the formula I. In an electrolyte, the lithium ion battery additive can effectively infiltrate an electrode material so that a battery reversible capacity is improved. Nitrogen in the polyvinylpyrrolidone compound can effectively capture transition metal ions dissolved out of a positive pole and an acid produced by electrolyte decomposition and prevent SEI membrane destroy.

Description

technical field [0001] The present application relates to the field of lithium-ion batteries, in particular, to a lithium-ion battery additive, a battery containing the additive and a preparation method. Background technique [0002] Lithium-ion batteries have high volume specific energy, weight specific energy and good environmental protection, and are widely used in portable 3C electronic devices such as mobile phones and notebook computers. As the requirements for electronic products tend to be smaller, lighter, and thinner in recent years, in addition to pursuing lower prices, the pursuit of higher energy density has become a strong driving force for improving electronic products. In addition, in recent years, countries have increased investment in high-power lithium-ion batteries, such as the development of electric tools, electric bicycles and automobiles. If this field is successfully developed, it can alleviate the increasingly tense oil resources, so it has high in...

Claims

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Application Information

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IPC IPC(8): H01M10/0567H01M10/0525
CPCH01M10/0525H01M10/0567H01M10/056Y02E60/10
Inventor 王珂史松君谢岚王耀辉
Owner CONTEMPORARY AMPEREX TECH CO
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