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Graphene/aluminum composite cathode material of lithium ion battery and preparation method thereof

A technology of lithium ion battery and negative electrode material, applied in battery electrodes, circuits, electrical components, etc., can solve the problems affecting the application of graphene, and achieve the effect of easy implementation, wide promotion, and simple preparation process

Inactive Publication Date: 2011-01-05
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At the same time, Song Huaihe et al [Peng Guo, Huaihe Song, Xiaohong Chen., Electrochemistry Communications, 2009, 11: 1320-1324.] and Guoxiu Wang [Guoxiu Wang, Xiaoping Shen, Jane Yao et al., Carbon, 2009, 47 : 2049-2053.] In-depth research has been done on it as the negative electrode of lithium-ion batteries, and it is found that it has a large charge specific capacity, but there is no platform in the charge-discharge curve, which affects the use of graphene as a negative electrode material in lithium-ion batteries. Applications in the field of batteries

Method used

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  • Graphene/aluminum composite cathode material of lithium ion battery and preparation method thereof
  • Graphene/aluminum composite cathode material of lithium ion battery and preparation method thereof
  • Graphene/aluminum composite cathode material of lithium ion battery and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0014] Take by weighing Graphene 2g, aluminum powder 200mg, place in ball mill, after continuous ball milling 5h, obtain the fully mixed graphene / aluminum composite material; Take by weighing this composite material 540mg, concentration is 60% polytetrafluoroethylene (PTFE) Put 386mg of ethanol emulsion into a 100ml small beaker, then add 40ml of absolute ethanol to mix the above mixture evenly into a slurry, and when it is half-dried, press it on the copper foil current collector to make a negative electrode according to the battery plate manufacturing process Then place it in a vacuum drying oven and dry it at 150°C, use the lithium sheet as the positive electrode, and form a lithium-ion battery with the above materials, and charge and discharge the materials for 2 cycles of aging at a current density of 10mA / mg. The graphene / aluminum composite negative electrode material is obtained.

[0015] Preparation of the positive electrode of the lithium-ion battery: take the positiv...

Embodiment 2

[0018] Take by weighing Graphene 2g, aluminum powder 2g, place in agitator, after continuous stirring 1h, obtain the fully mixed graphene / aluminum composite material; Take by weighing this composite material 1.08g, concentration is 60% polytetrafluoroethylene (PTFE ) Ethanol emulsion 0.45g into a 100ml small beaker, then add 40ml of N-methyl-2-pyrrolidone to mix the above mixture evenly into a slurry, when it is baked to semi-dry according to the battery plate manufacturing process, press it on the copper The negative plate is made on the foil current collector, and then it is placed in a vacuum drying oven and dried at 100°C. The lithium sheet is used as the positive electrode to form a lithium-ion battery with the above materials, and the materials are tested at a current density of 100mA / mg. After one cycle of charging and discharging, the graphene / aluminum composite negative electrode material was obtained.

[0019] Preparation of the positive electrode of the lithium-ion ...

Embodiment 3

[0022] Take by weighing Graphene 2g, aluminum powder 6g, place in ball mill, after continuous ball milling 3h, obtain the fully mixed graphene / aluminum composite material; Take by weighing this composite material 540mg, concentration is 60% polytetrafluoroethylene (PTFE) Put 100mg of ethanol emulsion into a 100ml small beaker, then add 30ml of N-methyl-2-pyrrolidone to mix the above mixture evenly into a slurry, and when it is half-dried, press it on the copper foil set Make a negative plate on the fluid, then place it in a vacuum drying oven and dry it at 100°C, use a lithium sheet as the positive electrode, and form a lithium-ion battery with the above materials, and charge and discharge one at a current density of 30mA / mg cycle, charge and discharge the graphene / aluminum material to obtain a graphene / aluminum composite negative electrode material.

[0023] The counter electrode of the lithium-ion battery is a lithium sheet;

[0024] Lithium-ion battery assembly: In a dry g...

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Abstract

The invention discloses a graphene / aluminum composite cathode material of lithium ion battery and a preparation method thereof and belongs to the cathode material technology of lithium ion battery technology. The cathode material comprises grapheme and aluminum in a mass ratio of 1:0.1-100, and the capacity is between 600 and 1,200 mAh / g. The preparation process of the cathode material comprises the following steps of: uniformly mixing the grapheme and the aluminum according to the mass ratio; pressing the mixed material on a copper foil current collector so as to obtain an electrode plate; assembling a battery by using the lithium plate; and performing the charge and discharge for 1 to 100 cycles for curing under a current density of 1 to 500 mA / mg so as to obtain the graphene / aluminum cathode material of the lithium ion battery. The graphene / aluminum cathode material of lithium ion battery and the preparation method have the advantages that: the preparation process is simple; the capacity and the circulation performance are much higher than those of a pure-aluminum and pure-graphene cathode material as well as the conventional commercial cathode material; and the graphene / aluminum cathode material is easy to realize and can widely promoted.

Description

technical field [0001] The invention relates to a graphene / aluminum composite negative electrode material for a lithium ion battery and a preparation method thereof, belonging to the negative electrode material technology of the lithium ion battery technology. Background technique [0002] In today's world, fossil energy is becoming increasingly scarce and environmental pollution is becoming more and more serious. The harmonious development of energy, resources, environment and human society has increasingly become the focus of social attention. The pursuit of renewable and clean energy and the harmonious development of people and the environment have gradually become the theme of the times. Therefore, lithium-ion batteries with high power density and high energy density, pollution-free and reusable have become the objects of general attention of governments and scientific research institutions in various countries. At present, carbon materials are widely used as negative el...

Claims

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Application Information

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IPC IPC(8): H01M4/38H01M4/139
CPCY02E60/122Y02E60/10
Inventor 杨全红游从辉苏方远吕伟
Owner TIANJIN UNIV
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