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Graphite flake /trimanganese tetroxide composite nano-material with sandwich structure, its preparation method, and lithium ion battery using it

A composite nanomaterial, manganese tetroxide technology, applied in nanotechnology for materials and surface science, battery electrodes, nanotechnology, etc., can solve the problem of low surface distribution density of graphene, large environmental impact, and long preparation period and other problems, to achieve the effect of high production cost, low degree of oxidation, and avoidance of re-accumulation

Active Publication Date: 2014-11-26
浙江东信昆辰科技股份有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But Mn 3 o 4 The distribution density on the graphene surface is not high
The process of preparing graphene oxide is complicated, and the preparation of graphene oxide has a great impact on the environment, and the preparation cycle is long

Method used

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  • Graphite flake /trimanganese tetroxide composite nano-material with sandwich structure, its preparation method, and lithium ion battery using it
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  • Graphite flake /trimanganese tetroxide composite nano-material with sandwich structure, its preparation method, and lithium ion battery using it

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preparation example Construction

[0037] see figure 1 , which is a flow chart showing the steps of the preparation method of the sandwich-structured graphite sheet / manganese tetraoxide composite nanomaterial according to the embodiment of the present invention, which includes the following steps:

[0038]S10, weighing the expanded graphite and dimethylformamide DMF according to the ratio of 0.5-5g / L, putting the expanded graphite into the DMF and ultrasonicating for 1-4 hours to obtain a graphite flake solution;

[0039] S20, add deionized water, the ratio of deionized to DMF is 1:1-1:9, stir evenly;

[0040] S30, take by weighing manganese acetate tetrahydrate, wherein manganese is valence II, referred to as manganese acetate tetrahydrate (II), the concentration of manganese acetate tetrahydrate (II) relative to the solvent DMF is 5-60g / L, manganese acetate tetrahydrate ( II) dissolve in solvent, stir evenly;

[0041] S40, put the above solution into the hydrothermal tank, wherein the filling volume ratio o...

Embodiment 1

[0049] Weigh 4 mg of expanded graphite and 8 ml of DMF, put the expanded graphite into DMF and perform ultrasonication for 1 hour to obtain a graphite flake solution. Weigh 2ml of deionized water, add graphite to obtain a solution, and stir evenly. Weigh 40 mg of manganese (II) acetate tetrahydrate, dissolve the manganese (II) acetate tetrahydrate in the mixed solvent, stir to dissolve. Put the above solution into a hydrothermal tank with a volume of 20ml. The reaction solution accounts for about 50% of the total volume of the hydrothermal tank, which meets the requirements of the filling volume ratio of the hydrothermal tank. The temperature is raised to 120 °C at a heating rate of 1 °C / min. The holding time is 1.5h, and then it is cooled with the furnace. Clean the microparticles with a centrifuge, wash with alcohol solution and water for 5 times each, bake at 50°C until the sample is dry, and obtain the graphite flake / manganese tetraoxide composite nanomaterial sample.

Embodiment 2

[0051] Weigh 40 mg of expanded graphite and 8 ml of DMF, put the expanded graphite into DMF and perform ultrasonication for 2 hours to obtain a graphite flake solution. Weigh 8ml of deionized water, add the graphite flake solution, and stir evenly. Weigh 480 mg of manganese (II) acetate tetrahydrate, dissolve the manganese (II) acetate tetrahydrate in the mixed solvent, and stir until completely dissolved. Put the above solution into a hydrothermal tank with a volume of 50ml. The reaction solution accounts for about 32% of the total volume of the hydrothermal tank, which meets the requirements of the filling volume ratio of the hydrothermal tank. The temperature is raised to 150 °C at a heating rate of 5 °C / min. The holding time is 5h, and then it is cooled with the furnace. The microparticles were cleaned with a centrifuge, and the cleaning was performed three times with alcohol solution and water. Bake at 80°C until the sample is dry to obtain a graphite flake / manganese te...

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Abstract

The invention discloses a graphite flake / trimanganese tetroxide composite nano-material with a sandwich structure, its preparation method, and a lithium ion battery using it. The method comprises the following steps: weighing expanded graphite and DMF according to a ratio of 0.5-5g / L, putting the expanded graphite in the DMF, and carrying out ultrasonic treatment for 1-4h to obtain a graphite flake solution; adding deionized water according to a ratio of deionized water to the DMF of 1:1-1:9, and uniformly stirring; weighing manganese (II) acetate tetrahydrate according to a ratio of the manganese acetate tetrahydrate to the solvent DMF of 5-60g / L, dissolving the manganese acetate tetrahydrate in the solvent, and uniformly stirring; adding the above obtained solution into a hydrothermal tank, heating, carrying out heat insulation, and carrying out furnace cooling; cleaning a black sediment by using a centrifuge after the above obtained material is cooled to room temperature; and baking the cleaned black sediment at 50-80DEG C until the obtained sample is dry. The method for obtaining a uniform Mn3O4 nanoparticle film on the surface of a non-oxidized graphite flake is simple, and is suitable for mass production.

Description

technical field [0001] The invention belongs to the field of lithium-ion energy storage materials, and in particular relates to a sandwich-structured graphite sheet / manganese tetraoxide composite nanomaterial, a preparation method and a lithium-ion battery using the same. Background technique [0002] Graphene has good conductivity and large specific surface area. Graphene materials are used instead of traditional carbon materials for electrodes of lithium-ion batteries and supercapacitors, which have shown good capacity characteristics and charge-discharge characteristics. However, a single graphene electrode has disadvantages such as easy agglomeration and poor cycle stability. Therefore, the preparation of metal oxides on the surface of graphene as electrodes is a recent research hotspot. [0003] The lithium storage mechanism of transition metal oxide MO is different from that of traditional lithium-ion batteries. During the Li+ intercalation process, Li and MO undergo ...

Claims

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Application Information

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IPC IPC(8): H01M4/133H01M4/131H01M4/1393H01M4/1391B82Y30/00B82Y40/00
CPCB82Y30/00B82Y40/00H01M4/364H01M4/50H01M4/587H01M10/0525Y02E60/10
Inventor 徐军明崔佳冬宋开新武军郑梁秦会斌
Owner 浙江东信昆辰科技股份有限公司
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