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Preparation method and application of lithium-ion power battery negative electrode material

A power battery and negative electrode material technology, which is applied in the field of electrochemical power supply, can solve the problems of energy loss of carbon materials, poor performance of high-rate charge and discharge, etc., and achieve the effects of low production cost, good stability, and high cycle stability

Active Publication Date: 2016-01-13
GUANGDONG TEAMGIANT NEW ENERGY TECH CORP
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Lithium-ion power batteries usually include four parts: positive electrode, negative electrode, electrolyte and diaphragm. The electrolyte is mainly absorbed in the diaphragm and is the carrier for lithium ions to move between the positive and negative plates. The negative electrode currently used in lithium-ion power batteries The material is mainly carbon anode materials, such as artificial graphite, natural graphite, etc., but due to the disadvantages of large energy loss and poor high-rate charge and discharge performance of carbon materials, and the surface of carbon electrodes is easy to precipitate metal lithium, forming dendrites and causing short circuits. , therefore, people's research goal is to find more reliable and more efficient new anode materials for lithium batteries

Method used

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  • Preparation method and application of lithium-ion power battery negative electrode material

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Effect test

Embodiment 1

[0018] Weigh titanium tetrachloride, methylamine and urea sequentially according to the mass ratio of 1:0.5:1 and add them to an appropriate amount of distilled water. After fully stirring and mixing, the mixed solution is added to the hydrothermal reactor. The pressure is 4MPa, the temperature is React at 150°C for 10 hours, wash the obtained material twice with distilled water, wash twice with ethanol, and dry to prepare nitrogen-doped titanium dioxide.

Embodiment 2

[0020] Weigh titanium tetrachloride, methylamine and urea sequentially according to the mass ratio of 1:0.2:2 and add them to an appropriate amount of distilled water. After fully stirring and mixing, the mixed solution is added to the hydrothermal reactor. At a pressure of 8 MPa and a temperature of React at 120°C for 6 hours, wash the obtained material twice with distilled water, wash twice with ethanol, and dry to prepare nitrogen-doped titanium dioxide.

Embodiment 3

[0022] (1) Weigh 1 g of pyrrole monomer, prepare an aqueous solution of pyrrole monomer with a concentration of 0.1M, and sonicate for 30 minutes;

[0023] (2) After adding 0.1 g of sodium dodecylsulfonate and 0.4 g of nitrogen-doped titanium dioxide prepared in Example 1 to the pyrrole solution obtained in step (1), after ultrasonication for 10 minutes, the reaction temperature was 120 ° C, and the reaction The power is 120KW;

[0024] (3) After the reaction, the solid was obtained by centrifugation, washed three times with deionized water, placed in an oven at a temperature of 120°C, and dried for 2 hours to obtain a composite of nitrogen-doped titanium dioxide and polypyrrole.

[0025] The resulting nitrogen-doped transition metal oxide and polypyrrole composite, carbon black and polyvinyl chloride were compressed to make a working electrode, and lithium hexafluorophosphate was used as an electrolyte to test the charge and discharge performance of the lithium-ion power batt...

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Abstract

The invention relates to a method for preparing a lithium ion power battery negative electrode material and application of the lithium ion power battery negative electrode material. The lithium ion power battery negative electrode material is prepared by the steps of reacting a pyrrole monomer, a surfactant and a nitrogen doped metal oxide reaction so as to obtain a product I, separating the product I easily so as to obtain a product II, washing the product II and drying the washed product II to obtain finished product. The obtained lithium ion power battery negative electrode material has the advantages of large specific capacity, high cycle stability, low toxicity, and low energy consumption, and is a lithium ion negative electrode material with the good performance. In addition, the method for preparing the lithium ion power battery negative electrode material is easy to operate, has no pollution to the environment and no side effect, is low in cost, and is a feasible method; the lithium ion power battery negative electrode material is convenient to use. The invention also relates to a preparing method for the nitrogen doped metal oxide. The method has the advantages of being low in production cost, great in feasibility, easy in achievement of industrial mass production.

Description

technical field [0001] The invention belongs to the field of electrochemical power sources, and in particular relates to a preparation method and application of negative electrode materials for lithium-ion power batteries. Background technique [0002] Lithium-ion power batteries have many advantages such as high voltage, small size and long life, etc. It has gradually entered the field of new energy vehicles and energy storage batteries, and has become the focus of research in the field of electrochemistry. [0003] Lithium-ion power batteries usually include four parts: positive electrode, negative electrode, electrolyte and diaphragm. The electrolyte is mainly absorbed in the diaphragm and is the carrier for lithium ions to move between the positive and negative plates. The negative electrode currently used in lithium-ion power batteries The material is mainly carbon anode materials, such as artificial graphite, natural graphite, etc., but due to the disadvantages of larg...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/48H01M4/60H01M4/62
CPCH01M4/48H01M10/0525Y02E60/10
Inventor 曾洪华曾宪武
Owner GUANGDONG TEAMGIANT NEW ENERGY TECH CORP