Method for preparing micro-expansion graphite material by mixture of scale graphite and microcrystal graphite

A technology of flake graphite and microcrystalline graphite, which is applied in the field of material preparation, can solve problems such as poor expansion effect of microcrystalline graphite, hindered application of lithium-ion electrode negative electrode materials, and reduced capacitance, so as to improve the intercalation effect, efficiency, and reserves Great, Inexpensive Effects

Inactive Publication Date: 2018-03-13
HUNAN GUOSHENG GRAPHITE TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] At the same time, the raw materials used in the current technology of using natural graphite as raw material to prepare micro-expanded graphite materials are generally crystalline large flake graphite. Although flake graphite has good collective orientation, it needs poor orientation and good uniformity in the application of battery materials. Microcrystalline graphite particles are fine, the aggregates have poor orientation and good homogeneity, and microcrystalline graphite can replace flake graphite as a raw material for preparing expanded graphite with better electrical properties, charging efficiency, battery stability and cycle performance. Greatly improved, but the capacitance is reduced, and the expansion effect of microcrystalline graphite is not good at the same time, which hinders the application of expanded microcrystalline graphite as a negative electrode material for lithium ion electrodes

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  • Method for preparing micro-expansion graphite material by mixture of scale graphite and microcrystal graphite
  • Method for preparing micro-expansion graphite material by mixture of scale graphite and microcrystal graphite

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Embodiment 1

[0041] The present invention prepares the micro-expanded graphite material by mixing microcrystalline graphite and flake graphite, comprising the following steps: comprising a graphite expansion furnace, adopting a high-temperature expansion method, comprising the following steps:

[0042] S1. Take microcrystalline graphite raw materials with 70% carbon content and flake graphite raw materials with 85% carbon content. The mass ratio of flake graphite and microcrystalline graphite is 2:1, crush and grind until the particle size is 300 mesh mixed graphite powder.

[0043] S2. Put the mixture obtained in S1 in a muffle furnace, slowly raise the temperature to 350° C. under a nitrogen atmosphere, keep it warm for 30 minutes, and air-cool to room temperature for later use.

[0044] S3. Carry out chemical intercalation treatment to the mixture after S2 heat treatment to obtain expandable mixed graphite, wherein the specific steps of chemical intercalation treatment are as follows:

...

Embodiment 2

[0050] The present invention prepares the micro-expanded graphite material by mixing microcrystalline graphite and flake graphite, comprising the following steps: comprising a graphite expansion furnace, adopting a high-temperature expansion method, comprising the following steps:

[0051] S1. Get the microcrystalline graphite raw material with carbon content of 75% and the flake graphite raw material with carbon content of 90%, the mass ratio of flake graphite and microcrystalline graphite is 2:1, crush and grind until the particle size is 200 mesh mixed graphite powder;

[0052] S2. Put the mixture obtained in S1 in a muffle furnace, slowly raise the temperature to 400° C. under a nitrogen atmosphere, keep it warm for 10 minutes, and air-cool to room temperature for use.

[0053] S3. Carry out chemical intercalation treatment to the mixture after S2 heat treatment to obtain expandable mixed graphite, wherein the specific steps of chemical intercalation treatment are as follow...

Embodiment 3

[0059] The present invention prepares the micro-expanded graphite material by mixing microcrystalline graphite and flake graphite, comprising the following steps: comprising a graphite expansion furnace, adopting a high-temperature expansion method, comprising the following steps:

[0060] S1. Get microcrystalline graphite raw material with carbon content of 75% and flake graphite raw material with carbon content of 85%, the mass ratio of flake graphite and microcrystalline graphite is 2.5:1, crushing and grinding, until particle size is 200 mesh mixed graphite powder;

[0061] S2. Put the mixture obtained in S1 in a muffle furnace, slowly raise the temperature to 400° C. under a nitrogen atmosphere, keep it warm for 10 minutes, and air-cool to room temperature for use.

[0062] S3. Carry out chemical intercalation treatment to the mixture after S2 heat treatment to obtain expandable mixed graphite, wherein the specific steps of chemical intercalation treatment are as follows: ...

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Abstract

The invention discloses a method for preparing a micro-expansion graphite material by a mixture of scale graphite and microcrystal graphite. Microcrystal graphite and scale graphite are taken as the raw materials to be subjected to ball milling; next, the ball milled mixture is put into a muffle furnace to be calcined and activated in an inert atmosphere; next, the activated mixed material is subjected to chemical intercalation treatment to obtain expandable mixed graphite; and the expandable mixed graphite is put into a graphite expansion furnace to be expanded at a temperature of 400-500 DEGC to obtain the micro-expansion graphite. The micro-expansion graphite prepared in the invention is of a structure with flocculent microcrystal graphite clamped between the scale graphite sheet layers, so that inter-electron conduction can be better facilitated, and the material is more suitable for being used as the lithium ion electrode material; and the charging and discharging capacity of theformed and expanded micro-expansion graphite material is improved and the cycle performance and rate discharging performance are improved.

Description

technical field [0001] The invention belongs to the technical field of material preparation, and more specifically relates to a method for preparing micro-expanded graphite material by mixing flake graphite and microcrystalline graphite. Background technique [0002] Due to the advantages of high output voltage and energy density, good cycle stability, and environmental friendliness, lithium-ion batteries have occupied most of the consumer electronics market as a power source for various electronic products. In recent years, with the The rapid replacement of products and the continuous development of the electric vehicle market require lithium-ion batteries to have lighter weight, smaller volume and higher power density. [0003] Micro-expanded graphite, as a kind of extremely low-cost graphite intercalation compound (GIC), is considered to be It is a class of anode materials with great potential that can be applied to lithium-ion batteries on a large scale. [0004] At th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/587H01M10/0525
CPCH01M4/587H01M10/0525Y02E60/10
Inventor 李丽萍林前锋
Owner HUNAN GUOSHENG GRAPHITE TECH CO LTD
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