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Preparation method of zinc manganate and graphene composite material

A composite material, graphene technology, applied in electrical components, electrochemical generators, battery electrodes, etc., can solve the problems of increasing the cost of synthesizing zinc manganate/graphene composite materials, cumbersome synthesis process, and limiting application prospects, etc. Achieve the effect of improving the cycle performance, simplifying the synthesis process and making the process reasonable

Inactive Publication Date: 2015-09-23
HARBIN INST OF TECH AT WEIHAI +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The problems of the above-mentioned preparation method are mainly that the synthesis process is cumbersome, the operation is complicated, and the cost of synthesizing zinc manganate / graphene composite material is increased simultaneously.
In addition, the organic reaction solvents (ethylene glycol, diethylene glycol) used in the existing preparation methods have certain toxicity, which limits their application prospects as a method for large-scale synthesis of zinc manganate / graphene composites

Method used

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Examples

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Effect test

preparation example Construction

[0014] A preparation method of zinc manganate / graphene composite material, it may further comprise the steps:

[0015] (1) Solution preparation: prepare a graphite oxide aqueous solution with a concentration of 1~2g / L; prepare a metal salt solution, in which Zn(CH 3 COO) 2 2H 2 O and Mn(CH 3 COO) 2 2H 2 The molar ratio of O is 1:2, Zn(CH 3 COO) 2 2H 2 O molar concentration is 0.05~0.2M.

[0016] (2) Solution mixing: Under stirring conditions, slowly add the above metal salt solution into the graphite oxide aqueous solution according to the volume ratio of metal salt solution:graphite oxide solution volume ratio of 1:5~7, mix well and transfer to the reaction kettle. When the concentration of graphite oxide aqueous solution and metal salt aqueous solution is lower than the minimum concentration in the above-mentioned technical scheme, the productive rate is low, and when it is higher than the maximum concentration in the above-mentioned technical scheme, the reaction ...

Embodiment 1

[0022] Embodiment 1: a kind of preparation method of zinc manganate / graphene composite material, it may further comprise the steps:

[0023] (1) Solution preparation: choose graphite oxide synthesized by the Hummers method, prepare a graphite oxide aqueous solution with a concentration of 2g / L; prepare Zn(CH 3 COO) 2 2H 2 O and Mn(CH 3 COO) 2 2H 2 Aqueous metal salt solution of O, in which Zn(CH 3 COO) 2 2H 2 O concentration is 0.1M, Mn(CH 3 COO) 2 2H 2 The concentration of O is 0.2M;

[0024] (2) Solution mixing: Slowly add the above 2L metal salt solution into 12L graphite oxide aqueous solution under stirring condition, and mix the solution evenly;

[0025] (3) Hydrothermal growth: transfer the above mixed solution into the reactor, adopt the hydrothermal method, set the temperature of the reactor to 180°C, and the reaction time is 12h;

[0026] (4) Product collection: After the reaction was completed, after the reaction kettle was cooled to room tempera...

Embodiment 2

[0027] Embodiment 2: a kind of preparation method of zinc manganate / graphene composite material, it may further comprise the steps:

[0028] (1) Solution preparation: choose graphite oxide synthesized by the Hummers method, prepare a graphite oxide aqueous solution with a concentration of 1g / L; prepare Zn(CH 3 COO) 2 2H 2 O and Mn(CH 3 COO) 2 2H 2 Aqueous metal salt solution of O, in which Zn(CH 3 COO) 2 2H 2 O concentration is 0.05M, Mn(CH 3 COO) 2 2H 2 The concentration of O is 0.1M;

[0029] (2) Solution mixing: Slowly add the above 2L metal salt solution into 12L graphite oxide aqueous solution under stirring condition, and mix the solution evenly;

[0030] (3) Hydrothermal growth: transfer the above mixed solution into the reactor, adopt the hydrothermal method, set the temperature of the reactor to 180°C, and the reaction time is 12h;

[0031] (4) Product collection: After the reaction is completed, after the reaction kettle is cooled to room temperat...

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Abstract

The invention relates to a preparation method of a zinc manganate and graphene composite material. The preparation method comprises the following steps: firstly preparing a graphite oxide water solution and a metal salt water solution, wherein the mole ratio of Zn(CH3COO)2.2H2O to Mn(CH3COO)2.2H2O in the metal salt water solution is 1: 2, and the molar concentration of the Zn(CH3COO)2.2H2O is 0.05-0.2 M; mixing the metal salt water solution and the graphite oxide water solution in a volume ratio of 1(5-7) under a stirring condition, transferring the mixture into a reaction kettle after uniformly mixed, wherein the temperature of the reaction kettle is 160-190 DEG C, and the reaction time is 6-12 h; and after the reaction kettle is cooled to room temperature, filtering, precipitating and washing the product with deionized water, and performing freeze drying on a sediment product to obtain an in situ synthesized ZnMn2O4 / graphene composite material. The preparation method is reasonable in technology, simple and convenient in operation, high in efficiency and low in preparation cost. The prepared zinc manganate and graphene composite material can serve as an anode material for a lithium ion battery, and has the characteristics of high specific area, high specific capacity and long cycle life.

Description

technical field [0001] The invention relates to a preparation method of a negative electrode material of a lithium ion battery, in particular to a method for synthesizing a zinc manganate / graphene composite material for a negative electrode of a lithium ion battery in one step. Background technique [0002] With the high development and progress of human society, the traditional fossil energy on which the earth relies for survival is increasingly scarce, and at the same time it has caused a series of environmental pollution problems. Therefore, the development of new energy is urgent. With the rapid development of the information and electronics industries, portable electronic devices, mobile communications, digital processors, etc. The demand for batteries is growing rapidly. Currently used secondary batteries mainly include lithium-ion batteries, lead-acid batteries, nickel-cadmium batteries, etc. Among them, lithium-ion batteries have been widely used due to their advant...

Claims

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Application Information

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IPC IPC(8): H01M4/50H01M4/62
CPCH01M4/50H01M4/625H01M4/628H01M10/0525Y02E60/10
Inventor 温广武王东周薇薇张永
Owner HARBIN INST OF TECH AT WEIHAI
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