Method for preparing hard carbon material and lithium ion battery

A technology of hard carbon and pitch materials, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of small lithium intercalation capacity and reversible capacity, peeling off of graphite layered structure, poor low temperature performance, etc., and achieve good cycle stability , simple preparation method and low cost

Active Publication Date: 2012-10-10
JIXI BTR GRAPHITE IND PARK CO LTD +3
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Problems solved by technology

[0002] Lithium-ion battery anode materials mainly include carbon materials, alloy materials and composite materials, among which, due to factors such as wide distribution and low price of carbon materials, carbon materials have been widely used in the field of lithium-ion batteries; Materials usually include graphite-like carbon materials and non-graphite-like carbon materials; and graphite-like carbon materials, although they have good electrical conductivity and high crystallinity, have a good charge-discharge platform, but due to the layered structure of graphite, it is different from organic The compatibility of solvents is poor. During the charging process of lithium-ion batteries, the solvent molecules are easily embedded in the graphite sheet with lithium ions and destroy the graphite layered structure, resulting in the peeling of the graphite layered structure and the cracking or pulverization of graphite particles. , which in turn leads to the degradation of lithium-ion battery cycles and the reduction of capacity; and due to the particularity of graphite's own structure, its high-power charge and discharge performance is relatively poor, so to a certain extent, it limits the use of graphite

Method used

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  • Method for preparing hard carbon material and lithium ion battery
  • Method for preparing hard carbon material and lithium ion battery
  • Method for preparing hard carbon material and lithium ion battery

Examples

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preparation example Construction

[0031] The preparation method of hard carbon material of the present invention comprises the following processes and steps:

[0032] Step 1: the process of forming the cracking precursor, first dissolving the organic polymer containing epoxy groups, adding asphalt material to the organic polymer solution containing epoxy groups to form the cracking precursor.

[0033] Step 2: forming carbides, evaporating or solidifying the cracked precursors, and then carbonizing the cracked precursors to form carbides.

[0034] Step 3: the process of forming a hard carbon matrix, crushing the carbides to form a hard carbon matrix.

[0035] Step 4: the coating modification process of the hard carbon matrix, adding a coating precursor to coat the surface of the hard carbon matrix.

[0036] Step 5: pyrolysis process: pyrolyzing the coating precursor to form a hard carbon material.

Embodiment 1

[0038] In step 1, the phenolic resin is selected and put into an ethanol solvent for dissolution; pitch is added to the formed phenolic resin solution for fusion to form a cracking precursor. In this step, in order to achieve the best effect of the embodiment, the preferred molecular weight of the phenolic resin is 340~30000 phenolic resin, and the asphalt addition is preferably 10~500%, 10%, 500% ratio, formed by dissolving The solid content in the mixed solution of phenolic resin and asphalt is preferably 25~60%, 25%, 60%, and the mass ratio of phenolic resin and asphalt is preferably 1:0.1~1:5, 1:0.1, 1:1:5; And in order to ensure the performance of the hard carbon material, when dissolving the phenolic resin, it is preferably completely dissolved, and the phenolic resin solution and pitch are preferably fully fused.

[0039] Step 2, the cracking precursor formed by mixing the phenolic resin solution and pitch is evaporated to dryness; in order to ensure the effect of evapo...

Embodiment 2

[0046] In step 1, the acrylic resin is selected and put into a tetrahydrofuran solvent for dissolution; pitch is added to the formed acrylic resin solution for fusion to form a cracking precursor. In this step, in order to achieve the best effect of the embodiment, the acrylic resin preferably has an acrylic resin with a molecular weight of 340-30000, and the asphalt is preferably added in proportions of 10-500%, 10%, 500%, and is formed by dissolving The solid content in the mixed solution of acrylic resin and asphalt is preferably 25~60%, 25%, 60%, and the mass ratio of acrylic resin and asphalt is preferably 1:0.1~1:5, 1:0.1, 1:1:5; And in order to ensure the performance of the hard carbon material, when dissolving the acrylic resin, it is preferably completely dissolved, and the acrylic resin and asphalt are preferably fully fused.

[0047] Step 2, curing the cracking precursor formed by mixing the acrylic resin solution and asphalt; that is, adding a curing agent to the c...

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Abstract

The invention discloses a method for preparing a hard carbon material and a lithium ion battery and aims to solve the technical problems of low lithium intercalation capacity and reversible capacity of the lithium ion battery and low high-power charging and discharging performance. The method for preparing the hard carbon material comprises the following steps of: adding an asphalt material into an organic polymer solution which contains an epoxy group to form a cracking precursor; carbonizing to form carbide; crushing to form a hard carbon matrix; adding a coating precursor for coating; and pyrolyzing. The hard carbon material is coated on a cathode of the lithium ion battery and prepared by using the preparation method which comprises the steps of formation of the cracking precursor, carbonization, crushing, coating and pyrolysis. Compared with the prior art, the invention has the advantages that by co-pyrolysis of high-molecular weight organic molecules and asphalt, the hard carbon material which is high in porosity and highly-ordered is synthesized; and the hard carbon material is high in cycle stability, simple in preparation method, low in cost and applicable to the occasions of high capacity, low temperature and high-power discharge.

Description

technical field [0001] The present invention relates to a preparation method of a negative electrode material and a lithium ion battery of a negative electrode material prepared by the method, in particular to a preparation method of a hard carbon negative electrode material and a lithium ion battery of a hard carbon negative electrode material prepared by the method . Background technique [0002] Lithium-ion battery anode materials mainly include carbon materials, alloy materials and composite materials, among which, due to factors such as wide distribution and low price of carbon materials, carbon materials have been widely used in the field of lithium-ion batteries; Materials usually include graphite-like carbon materials and non-graphite-like carbon materials; and graphite-like carbon materials, although they have good electrical conductivity and high crystallinity, have a good charge-discharge platform, but due to the layered structure of graphite, it is different from...

Claims

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Application Information

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IPC IPC(8): H01M4/62H01M4/583H01M10/0525
CPCY02E60/122Y02E60/10
Inventor 岳敏肖洋汪福明刘祥黄友元
Owner JIXI BTR GRAPHITE IND PARK CO LTD
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