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Preparation method of composite lithium ion battery negative electrode material and application of petroleum resin in preparation method

A petroleum resin, ion battery technology, applied in electrode manufacturing, battery electrodes, secondary batteries, etc., can solve the problems of poor compatibility of non-polar polymers, poor adhesion performance, not suitable for use alone, etc., and achieve uniform particle size. Controllable, low-cost, easy-to-implement effects

Active Publication Date: 2016-06-29
湖南宏翔新能源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Poor bonding performance, high brittleness, poor aging resistance, not suitable for single use
Good compatibility with phenolic resin, coumarone resin, terpene resin, SBR, SIS, but poor compatibility with non-polar polymers due to high polarity

Method used

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  • Preparation method of composite lithium ion battery negative electrode material and application of petroleum resin in preparation method
  • Preparation method of composite lithium ion battery negative electrode material and application of petroleum resin in preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] An application of petroleum resin in the preparation of negative electrode materials for composite lithium-ion batteries. The petroleum resin is used as the coating material of the core material. The petroleum resin is also called hydrocarbon resin. A thermoplastic resin formed by polymerizing olefins or copolymerizing with aldehydes, aromatics, and terpenes. It includes four types: aliphatics, aromatics, cycloaliphatic dienes, and pure monomers. The molecular weight is between Between 300 and 5000; the particle size of the petroleum resin is less than 10 μm.

[0038] In the present invention, when the hard carbon material is used as the primary coating material of the core material, the petroleum resin is used as the secondary coating modification material.

[0039] The particle size of the petroleum resin of the present invention is preferably below 5 μm, and the petroleum resin is preferably C5 petroleum resin or C9 petroleum resin; the C5 petroleum resin is light ye...

Embodiment 2

[0063] In this embodiment, C9 petroleum resin is selected as the secondary coating modification material.

[0064] In step (1), the heteroatom additive described in this embodiment is diboron trioxide, the thermosetting resin is epoxy resin, and the carbon element content is 60%, and the organic solvent is ethanol, preferably absolute ethanol; Take 20g of diboron trioxide, 70g of epoxy resin, and 150g of absolute ethanol, and turn on the stirring device of the reactor. precursor solution.

[0065] In step (2), in this embodiment, 120 g of microcrystalline graphite with an average particle size of 10 μm was weighed, slowly added into the stirring reactor, and kept stirring for 180 minutes to obtain a precursor fluid slurry.

[0066] In step (3), keep the stirring device of the reactor open, and at the same time evacuate the reactor to keep the relative vacuum pressure of the reactor at -0.09MPa; Stir for 240 minutes, then continue to heat up to 200°C, keep stirring at this te...

Embodiment 3

[0072] In this embodiment, C9 petroleum resin is selected as the secondary coating modification material.

[0073] In step (1), the heteroatom additive described in this embodiment is boron phosphate, the thermosetting resin is furan resin, and the organic solvent is isopropanol, preferably anhydrous isopropanol; respectively weigh 20g boron phosphate, 70g Furan resin, 150g of anhydrous isopropanol, turn on the stirring device of the reaction kettle, put the weighed raw materials into the reaction kettle at room temperature, and then continue stirring for 90 minutes to obtain a precursor solution that is uniformly mixed and uniform in color.

[0074] In step (2), in this embodiment, 300 g of needle coke graphite with an average particle size of 22 μm was weighed, slowly added into the stirring reactor, and kept stirring for 150 min to obtain a precursor fluid slurry.

[0075] In step (3), keep the stirring device of the reactor open, and at the same time evacuate the reactor t...

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Abstract

The invention discloses a preparation method for a compound lithium ion battery cathode material with high energy density, high-rate-capability charge and discharge performance and good cycle performance, and application of petroleum resin in the preparation method. Petroleum resin is used as a coating material of a core material, particularly as a secondary coating and modifying material. The preparation method comprises steps of liquid preparation, material adding, drying for solidification, carbonization, modification, and high-temperature processing. The preparation technology is simple, and is easy to implement; a liquid phase system is adopted, coating is even and stable, and petroleum resin is adopted as a modifier, so that the modifier and a hard carbon coating layer have good compatibility and binding force, and the specific surface area of the hard carbon coating layer is reduced. The prepared cathode material has the tap density higher than 1.0g / cm<3> and the specific surface area of the prepared cathode material is controlled within 2m<2> / g-5m<2> / g. The prepared battery has the gram volume of 340mAh-370mAh, and supports continuous discharge lower than 40C, the momentary discharge can be higher than 60C, the charge and discharge capacity retention ratio is higher than 92% in 300 weeks, and the first charge and discharge efficiency is higher than 92%.

Description

technical field [0001] The present invention relates to a preparation method of a lithium ion battery negative electrode material, in particular to a preparation method of a composite lithium ion battery negative electrode material, in particular to a preparation method of a hard carbon coated and modified lithium ion battery negative electrode material And the application of petroleum resin in preparation method. Background technique [0002] Lithium-ion batteries have become a common commodity for mass consumption since their appearance in the early 1990s. The technology and process of lithium-ion batteries have also been continuously improved after maturity. At present, high capacity, high-rate charge and discharge performance, and ultra-long cycle capability have become lithium-ion batteries. The development requirements of the battery; and the lithium-ion battery anode material is a basic component of the lithium-ion battery, and its performance directly affects the per...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/62
CPCH01M4/0471H01M4/366H01M4/587H01M4/622H01M10/0525H01M2004/021Y02E60/10
Inventor 雷铁军梁育政
Owner 湖南宏翔新能源科技有限公司
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