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Blocky graphite negative electrode material for lithium ion battery, preparation method of blocky graphite negative electrode material and lithium ion battery

A lithium-ion battery, bulk graphite technology, applied in battery electrodes, secondary batteries, circuits, etc., to achieve the effects of long cycle life, good bonding, and broad application prospects

Active Publication Date: 2015-03-04
LUOYANG YUEXING NEW ENERGY TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, scientific researchers have mainly conducted a lot of research on flake graphite as a negative electrode material for lithium-ion batteries, while bulk graphite has rarely been studied.

Method used

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  • Blocky graphite negative electrode material for lithium ion battery, preparation method of blocky graphite negative electrode material and lithium ion battery
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  • Blocky graphite negative electrode material for lithium ion battery, preparation method of blocky graphite negative electrode material and lithium ion battery

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Embodiment 1

[0038] The block graphite negative electrode material for lithium ion batteries in this embodiment includes a block graphite substrate, and the surface of the block graphite substrate is coated with a graphite coating layer. The D50 of the bulk graphite anode material is 17.36 μm, and the tap density is 1.152 g / cm 3 , the specific surface area is 1.526m 2 / g.

[0039] The preparation method of the lithium-ion battery block graphite negative electrode material of the present embodiment comprises the following steps:

[0040] 1) Choose block graphite with a purity of 90% and D50 of 50 μm, crush and classify with a pulverizer to select block graphite particles with a particle size distribution D50 of 20 μm, and combine block graphite, NaOH solid and deionized water at a ratio of 1:0.3: The mass ratio of 0.7 was melted with alkali at 550°C for 1.5h, washed with water and dried, then acid-leached with 15% hydrochloric acid at a constant temperature of 80°C for 2.5h, washed with d...

Embodiment 2

[0048] The block graphite negative electrode material for lithium ion batteries in this embodiment includes a block graphite substrate, and the surface of the block graphite substrate is coated with a graphite coating layer. The D50 of the bulk graphite anode material is 14.36 μm, and the tap density is 1.023 g / cm 3 , the specific surface area is 1.952m 2 / g.

[0049] The preparation method of the lithium-ion battery block graphite negative electrode material of the present embodiment comprises the following steps:

[0050] 1) Choose block graphite with a purity of 80% and D50 of 70 μm, crush and classify with a pulverizer to select block graphite particles with a particle size distribution D50 of 25 μm, and combine block graphite, NaOH solid and deionized water at a ratio of 1:0.4: The mass ratio of 0.6 was melted with alkali at 500°C for 2 hours, washed with water and dried, then acid-leached with 13% hydrochloric acid at a constant temperature of 90°C for 2 hours, washed ...

Embodiment 3

[0056] The block graphite negative electrode material for lithium ion batteries in this embodiment includes a block graphite substrate, and the surface of the block graphite substrate is coated with a graphite coating layer. The D50 of the bulk graphite anode material is 14.66 μm, and the tap density is 1.146 g / cm 3 , the specific surface area is 2.058m 2 / g.

[0057] The preparation method of the lithium-ion battery block graphite negative electrode material of the present embodiment comprises the following steps:

[0058] 1) Choose block graphite with a purity of 85% and a D50 of 100 μm, crush and classify with a pulverizer to select block graphite particles with a particle size distribution D50 of 30 μm, and combine block graphite, NaOH solids and deionized water at a ratio of 1:0.3: The mass ratio of 0.7 was melted with alkali at 550°C for 1.5h, washed with water and dried, then acid-leaved with 15% hydrochloric acid at a constant temperature of 80°C for 2.5h, washed twi...

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Abstract

The invention discloses a blocky graphite negative electrode material for a lithium ion battery, a preparation method of the blocky graphite negative electrode material and the lithium ion battery. The negative electrode material comprises a blocky graphite matrix, wherein the surface of the blocky graphite matrix is coated with a graphite coating layer. According to the blocky graphite negative electrode material for the lithium ion battery, a great number of micro-holes are formed in the surface of the blocky graphite matrix, and the graphite coating layer is highly combined with the coated blocky graphite matrix, so that the blocky graphite negative electrode material has the advantages of high intermolecular binding force, high tap density, high reversible specific capacity and good rate performance, a negative electrode sheet prepared by using the blocky graphite negative electrode material is slightly bounced and expanded, and the prepared lithium ion battery has excellent electrochemical performance. According to the blocky graphite negative electrode material, the purpose of blocky graphite is expanded, the additional value of a natural graphite product is increased, and the development space of a negative electrode material source of the lithium ion battery is enlarged; the negative electrode material can be used as the negative electrode material of an aluminum shell lithium ion battery, a flexibly package lithium ion battery, a cylindrical lithium ion battery and other lithium ion batteries; the blocky graphite negative electrode material has a wide application prospect.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to a block graphite negative electrode material for a lithium ion battery, and also relates to a preparation method of a block graphite negative electrode material for a lithium ion battery and a lithium battery using the block graphite negative electrode material. ion battery. Background technique [0002] Compared with traditional lead-acid and nickel-cadmium secondary batteries, lithium-ion batteries have the advantages of high operating voltage, high specific energy, wide operating temperature range, stable discharge, long cycle life, and no memory effect. Energy storage power supplies are widely used in communication equipment, electric tools, aerospace and other fields. At present, with the continuous advancement of technology, people have put forward higher requirements for lithium-ion batteries. Lithium-ion batteries with high energy density, high ...

Claims

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Application Information

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IPC IPC(8): H01M4/587H01M4/133C01B31/04H01M10/0525
CPCY02E60/10
Inventor 徐军红陈玉
Owner LUOYANG YUEXING NEW ENERGY TECH
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