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Preparation method of aqueous sodium ion battery cathode composite material

A technology for sodium ion batteries and composite materials is applied in the field of preparation of positive electrode composite materials for aqueous sodium ion batteries, which can solve the problems of poor safety performance, complex production process and high cost, and achieve the effects of enhancing electrical conductivity and improving rate capability.

Active Publication Date: 2018-02-23
INT ACAD OF OPTOELECTRONICS AT ZHAOQING SOUTH CHINA NORMAL UNIV
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Problems solved by technology

[0004] The purpose of the present invention is to overcome the problems of high cost, complex production process and poor safety performance faced by traditional lithium-ion batteries using organic solvents as electrolytes, and to provide a NMO-CNT-RGO composite for the positive electrode of aqueous sodium-ion batteries. The preparation method of the material, which is a method of preparing NMO-CNT-RGO by using hydrothermal reaction and spray drying method, this method is not only simple to operate, low in cost, but also environmentally friendly

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  • Preparation method of aqueous sodium ion battery cathode composite material
  • Preparation method of aqueous sodium ion battery cathode composite material
  • Preparation method of aqueous sodium ion battery cathode composite material

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Embodiment 1

[0027] The first step is to prepare the cathode composite material (NMO-CNT-RGO composite material) for aqueous sodium ion battery:

[0028] Measure 25mL of 0.28mol / L MnSO 4 , stirred for 30min, and then weighed 25mL of NaOH with a concentration of 3mol / L and KMnO with a concentration of 0.1mol / L 4 The mixed solution was stirred for 30min, and the MnSO 4 Add NaOH and KMnO to the solution 4 In the mixed solution, stir for 30min, then introduce the mixed solution into a test tube and centrifuge to obtain a black precipitate, pour out the water in the test tube, and let the test tube stand for 24 hours to obtain Na 0.44 MnO 2 Precursor.

[0029] Weigh 4.38g of precursor and add it to 15mol / L NaOH solution, stir for 20min, pour it into the reaction kettle for 24h hydrothermal reaction at 180°C, after cooling down to room temperature, centrifuge with deionized water and place in a vacuum oven Dry at 70°C for 24h to obtain Na 0.44 MnO 2 .

[0030] Weigh 22.32mg of GO, 248mg ...

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Abstract

The invention provides a preparation method of an aqueous sodium ion battery cathode composite material. The method comprises the following steps: S1. manganese sulfate is added into a mixed solutionof sodium hydroxide and permanganate and centrifugation is carried out, deposition after centrifugation is taken out, and a Na0.44MnO2 precursor is obtained; S2. the Na0.44MnO2 precursor obtained in the S1 is dissolved in a sodium hydroxide solution and a hydrothermal reaction is carried out, after the reaction ends, centrifugation is carried out, and drying is carried out in order to obtain Na0.44MnO2; S3. Na0.44MnO2 obtained in the S2, graphene and carbon nanotubes are added into water, after ultrasonic treatment, filtering and drying, calcination is carried out, and the aqueous sodium ion battery cathode composite material is obtained. The preparation method has the advantages of simple operation, low cost and green and environmental protection, and Na0.44MnO2 has a tunnel structure andis good for embedding and de-intercalation of sodion; reduced graphene oxide and carbon nanotubes are doped in Na0.44MnO2, conductivity of Na0.44MnO2 is enhanced, and multiplying power of the batteryis improved.

Description

technical field [0001] The invention relates to the technical field of preparation of positive electrode materials for batteries, and more specifically, to a method for preparing positive electrode composite materials for aqueous sodium ion batteries. Background technique [0002] The rapid development of the global economy has led to the continuous consumption of non-renewable energy, resulting in an energy crisis. In order to solve the energy crisis, the development and utilization of renewable energy generation represented by solar energy and wind energy has become a top priority. However, these natural energy sources including solar energy, wind energy, tidal energy, etc. are intermittent, and the amount of electric energy generated by them depends heavily on natural factors such as weather, season, time, and location. If these unstable electric energy is directly connected to the grid, it will seriously interfere with the normal operation of the grid. The adoption of ...

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Application Information

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IPC IPC(8): H01M4/36H01M4/505H01M4/62H01M10/36
CPCH01M4/362H01M4/505H01M4/625H01M10/36H01M2004/028Y02E60/10
Inventor 张永光王新
Owner INT ACAD OF OPTOELECTRONICS AT ZHAOQING SOUTH CHINA NORMAL UNIV
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