Lithium ion power battery composite cathode material and its preparation method

A negative electrode material and power battery technology, applied in battery electrodes, circuits, electrical components, etc., can solve the problems of reducing the first irreversible capacity of natural microcrystalline graphite, affecting the first charge and discharge performance of the material, and unfavorable battery manufacturing process, so as to avoid irreversibility. loss, good charge-discharge cycle performance, and uniform surface properties

Active Publication Date: 2013-05-01
HUZHOU CHUANGYA POWER BATTERY MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The key to this method is to form a complete coating on the outside of the graphite, otherwise it will not be able to prevent the contact between the electrolyte and the graphite. Generally, a layer of resin carbon is coated on the surface of the natural microcrystalline graphite particles to form a core-shell structure. The inside is natural microcrystalline graphite, and the outside is a 1-2 μm phenolic resin pyrolytic carbon layer. Coating treatment can reduce the first irreversible capacity of natural microcrystalline graphite, but only coating the resin hard carbon precursor will make it incompatible with graphite materials. In addition, due to the low degree of graphitiza

Method used

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  • Lithium ion power battery composite cathode material and its preparation method
  • Lithium ion power battery composite cathode material and its preparation method
  • Lithium ion power battery composite cathode material and its preparation method

Examples

Experimental program
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Effect test

Embodiment 1

[0035] A lithium ion power battery composite negative electrode material is prepared by the following method:

[0036] Take 24 g of thermosetting resin phenolic resin and 240 g of solvent anhydrous ethanol and mix them evenly at room temperature, add 300 g of natural graphite with an average particle size of 4.0? The resin is mixed evenly, and then the curing agent H is added. ３ PO ４ And continue to stir until the mixture is uniform, then heat the solution to remove the organic solvent contained in it, and then carry out curing treatment to obtain a thermosetting resin mixture after curing treatment. , and then cured at 60°C for 2h; add 15g of secondary modifier coal tar pitch to the cured sample, raise its temperature to 400°C at a heating rate of 0.1°C / min for 2h to obtain the secondary modification mixture; the mixture after the secondary modification is heated to 800°C at a heating rate of 5°C / min, reacted in an inert gas atmosphere for 2 hours and then naturally lowered...

Embodiment 2

[0038] Same as Example 1, the difference is that the thermosetting resin is epoxy resin and furan resin; and the modifier is petroleum asphalt.

Embodiment 3

[0040] A lithium ion power battery composite negative electrode material is prepared by the following method:

[0041] Take 24 g of thermosetting resin epoxy resin and 240 g of solvent anhydrous ethanol and mix them evenly at room temperature, add 300 g of natural graphite with an average particle size of 9.0 μm, and mechanically stir the above mixture in a stirring tank for 3 hours to make natural graphite and The thermosetting resin is mixed evenly, and then the curing agent H is added. ３ PO ４ And continue to stir until the mixture is evenly mixed, then heat the solution to remove the organic solvent contained in it, and then carry out curing treatment to obtain a thermosetting resin mixture after curing treatment. , and then cured at 150°C for 5h; add 15g of secondary modifier coal tar pitch to the cured sample, raise its temperature to 600°C at a heating rate of 3°C / min for 4h to obtain the secondary modification The mixture after the secondary modification is subjected ...

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Abstract

The invention relates to a battery cathode material, mainly relates to a lithium ion power battery composite cathode material and its preparation method, and belongs to the lithium battery making field. The lithium ion power battery composite cathode material is characterized in that the lithium ion power battery composite cathode material comprises a core-shell structure composed of a natural graphite matrix and a hard carbon layer coated on the surface of the natural graphite matrix, and a secondary modification layer for modifying the core-shell structure through adopting a modifying agent; the above coating is hard carbon formed through pyrolysis of a thermosetting resin; the thermosetting resin is at least one selected from a phenolic resin, an epoxy resin and a furan resin; and the modifying agent is at least one selected from coal tar pitch and petroleum asphalt. The lithium ion power battery composite cathode material having good electrochemical performances comprising capacity, first efficiency, cycle, rate and the like is prepared through adopting the primary coating and secondary modifying method.

Description

technical field [0001] The invention relates to a battery negative electrode material, mainly relates to a lithium ion power battery composite negative electrode material and a preparation method thereof, and belongs to the field of lithium battery production. Background technique [0002] Lithium-ion batteries have the advantages of high working voltage, large specific energy, and good safety performance, and are widely used in mobile communications, notebook computers and other fields. Especially with the wide application of electric vehicles in the future, higher requirements are put forward for lithium-ion batteries. . Natural graphite materials as negative electrode materials have the advantages of abundant reserves, high specific capacity, low voltage platform, and very strong cost performance, but there are serious defects in direct use, such as low initial discharge efficiency, poor cycle performance, and electrolysis. The shortcomings of high liquid selectivity lim...

Claims

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Application Information

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IPC IPC(8): H01M4/38H01M4/62
CPCY02E60/12Y02E60/10
Inventor 郭雷张亚媛郭翠静吕猛胡博
Owner HUZHOU CHUANGYA POWER BATTERY MATERIALS
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