Graphite powder for negative electrode of lithium ion secondary cell and manufacturing method thereof

A secondary battery, graphite powder technology, applied in electrode manufacturing, battery electrodes, circuits, etc., can solve the problem of high material cost, achieve the effect of improving safety performance and reducing price

Active Publication Date: 2004-12-29
LUOYANG GUANQI INDAL & TRADE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This carbon material is disadvantageous from a cost point of view because its material cost is high due to the use of a special resin for carbonization, and also, it cannot provide an improved charge / discharge Coulombic efficiency for the negative electrode.

Method used

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  • Graphite powder for negative electrode of lithium ion secondary cell and manufacturing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Embodiment 1, the graphite powder with the surface closed end structure of the present invention is prepared through the first process. Take natural graphite 32 mesh 200kg, use a high-speed pulverizer, a kind of rotary high-speed pulverizer with 16 or 24 hammers, pulverize it at a rotation speed of 6000rpm for 10 minutes, and then use a low-speed impact ball to pulverize the graphite powder generated. The pulverizer was processed at a rotation speed of 3000rpm for 40 minutes, and the generated graphite powder was sorted to positive 5um and negative 75um by a classifier and used to make electrodes. The size distribution of the sieved graphite powder was measured using a laser diffraction / scattering size distribution analyzer. The average particle diameter of graphite powder in each batch is about 25um. The graphite powder prepared in each batch was used to produce electrodes as follows, mixing 90 parts by weight of graphite powder and 10 parts by weight of vinylidene fl...

Embodiment 2

[0031] Embodiment 2, the graphite powder with the surface closed end structure of the present invention is prepared through the first process. By getting natural graphite 200 order 200kg with a high-speed pulverizer a kind of rotary high-speed pulverizer that has 16 or 24 hammers, pulverized 20 minutes under the rotation speed of 5500rpm. The graphite powder that generates is processed 60 minutes under the rotating speed of 2500rpm with low-speed impact ball mill again. The generated graphite powder is sorted to positive 5um and negative 63um by a classifier and used to make electrodes. The size distribution of the sieved graphite powder was measured using a laser diffraction / scattering size distribution analyzer. The average particle diameter of graphite powder in each batch is about 23um. After the pulverized graphite powder was sorted to plus 5um to minus 63um, it was used to make electrodes for testing in the same manner as described in Example 1. The discharge capaciti...

Embodiment 3

[0032] Embodiment 3, the graphite powder with the surface closed end structure according to the present invention is prepared through the first process. By getting natural graphite 325 order 200kg with high-speed pulverizer, a kind of rotary high-speed pulverizer with 16 or 24 hammers, pulverized 30 minutes under 5000rpm rotating speed. The graphite powder that generates is processed 80 minutes under the rotating speed of 2000rpm with low-speed impact ball mill again. The generated graphite powder is sorted to positive 6um and negative 60um by a classifier and used to make electrodes. The size distribution of the sieved graphite powder was measured using a laser diffraction / scattering size distribution analyzer, and the average particle diameter of the graphite powder in each batch was about 21 um. After the pulverized graphite powder was sorted to plus 6um to minus 60um, it was used to make electrodes for testing in the same manner as described in Example 1. The discharge c...

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Abstract

The invention discloses graphite powder for negative electrodes of lithium ion secondary cells and method for its preparation, wherein the graphite powder is in spherical shape and has an end portion construction with closed surfaces, wherein the method comprises the steps of, (1) charging natural crystaline flake graphite into high speed disintegrator, performing efflorescence 10 to 80 minutes under the condition of 3000 to 6000 rotations per minute, (2) charging into slow run impulse type globurizing crushing machine, performing globurizing and dressing treatment for 40 to 180 minutes under the condition of 600-3000 rotations per minute.

Description

technical field [0001] The invention relates to a graphite powder and a preparation method, in particular to a graphite powder used in a negative electrode of a lithium-ion secondary battery and a preparation method. Background technique [0002] A lithium secondary battery or storage battery is a type of nonaqueous secondary battery that uses lithium as the active material of the negative electrode and oxides or chalcogenides of transition metals, such as sulfide and selenide, as the active material of the positive electrode. , that is, an inorganic or organic lithium salt solution dissolved in an inert organic solvent is used as the electrolyte. Since lithium is an alkali metal with a very low potential, the use of lithium as the negative electrode in the battery provides the ability for the battery to readily obtain high potential therefrom. For this reason, lithium secondary batteries have attracted more and more attention as secondary batteries promising high electromo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/04H01M4/04H01M4/58
CPCY02E60/12Y02E60/10
Inventor 岳敏
Owner LUOYANG GUANQI INDAL & TRADE
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