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A kind of preparation method of inorganic doping modified natural graphite

A natural graphite and inorganic technology, applied in structural parts, electrical components, battery electrodes, etc., to improve the rate charge-discharge and cycle performance, the preparation method is simple, and the operability is strong

Active Publication Date: 2019-05-14
FUJIAN XFH NEW ENERGY MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Aiming at the existing technical problems, the present invention provides a method for preparing inorganic doped modified natural graphite. The natural graphite is doped and intercalated by an electrochemical method, and then coated in a high temperature process.

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  • A kind of preparation method of inorganic doping modified natural graphite

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Embodiment 1

[0020] A kind of preparation method of inorganic doping modified natural graphite, it comprises the following steps:

[0021] (1) Add 0.1 part of polyvinyl alcohol to 10 parts of natural graphite raw materials with D50=16um and 99.95% purity, first stir and mix at a stirring speed of 500r / min for 0.5h, and then mix at a temperature of 80°C and a pressure of 5MPa Pressed into graphite electrodes under certain conditions;

[0022] (2) The graphite electrode obtained in step (1) is used as an anode, the platinum electrode is used as a cathode, and the aqueous solution containing ammonium dihydrogen phosphate is used as an electrolyte, and an electrochemical reaction is performed under a voltage of 2V applied between the cathode and the anode, The reaction time is 1h.

[0023] (3) After draining and washing the reaction product obtained in the electrolytic cell in step (2), drying in the air for 3 hours to obtain an inorganic doped modified natural graphite precursor;

[0024] (...

Embodiment 2

[0026] In this example, the natural graphite D50 added in step (1) is 11um, with a purity of 99.96%, and 0.4 parts of polyvinylidene fluoride is added. In step (2), the copper electrode is selected as the cathode, and the aqueous solution containing ammonium sulfate is used as the electrolyte , electrochemical reaction at 10V voltage for 5h, except that, other processes and conditions were consistent with Example 1.

Embodiment 3

[0028] In this example, in step (1), stir and mix for 1 h at a stirring speed of 1000 r / min, press to form a graphite electrode at a temperature of 200 ° C and a pressure of 20 MPa, and in step (4) process at a temperature of 1200 ° C for 10 Hour, except that, other process and condition are consistent with embodiment one.

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Abstract

The invention discloses a method for preparing inorganic doped modified natural graphite. The method specifically comprises the following steps: adding an adhesive into a natural graphite raw material, and pressing so as to obtain a graphite electrode; by taking the graphite electrode as an anode, a metallic or non-metallic electrode as a cathode, and a water solution containing an inorganic doping agent as electrode, performing an electrochemical reaction on the cathode and the anode, sucking off a reaction product obtained in an electrolytic tank, washing with water, drying in air, performing high-temperature treatment for 5-12 hours at 800-1200 DEG C, and performing natural cooling, so as to obtain the inorganic doped modified natural graphite. The method disclosed by the invention is simple, convenient and efficient and low in cost, the rate capability and the circulation performance of an obtained carbon material are remarkably improved, and the carbon material can be used as a lithium ion battery cathode material.

Description

technical field [0001] The invention relates to the field of graphite material preparation, in particular to a method for preparing inorganic doped modified natural graphite. Background technique [0002] Carbon materials have the advantages of low chemical potential, good cycle performance, low price, and environmental friendliness, and are currently the most ideal and commonly used anode materials for lithium-ion batteries. Among carbon materials, compared with soft carbon and hard carbon, graphite materials have obvious advantages in terms of specific capacity, discharge platform and cost. Among them, natural graphite has the advantages of high specific capacity and low price, but it has a large initial irreversible capacity, poor cycle performance and poor rate performance. In order to overcome the defects of natural graphite, improve the electrochemical performance of carbon negative electrode materials, and reduce manufacturing costs, researchers often use surface mod...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/583H01M10/0525
CPCH01M4/583H01M10/0525Y02E60/10
Inventor 宋宏芳李梅戴涛赵东辉周鹏伟
Owner FUJIAN XFH NEW ENERGY MATERIALS CO LTD