Anode material of high-magnification aqueous alkali metal electrochemical battery and preparation method of anode material

A technology for battery positive electrode and positive electrode material, which is applied in battery electrodes, alkaline storage batteries, circuits, etc., can solve the problems of rapid capacity decay and low effective recyclable specific capacity, and achieves simple process lines, easy industrialized continuous production, and high efficiency. The effect of electrochemical performance

Active Publication Date: 2013-12-11
ENPOWER ENERGY TECH ANHUI CO LTD +1
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  • Abstract
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AI Technical Summary

Problems solved by technology

[0010] However, the above studied manganate with spinel structure and birnessite structure or phosphate positive electrode material with core-shell structure, although its theoretical specific capacity is more than 100mAh / g, but in the presence of sodium / potassium ions The effective cyclable specific capacity in aqueous solution is low, and the capacity decays rapidly at high rates

Method used

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  • Anode material of high-magnification aqueous alkali metal electrochemical battery and preparation method of anode material
  • Anode material of high-magnification aqueous alkali metal electrochemical battery and preparation method of anode material
  • Anode material of high-magnification aqueous alkali metal electrochemical battery and preparation method of anode material

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Effect test

Embodiment 1

[0038] Put 1.3g of potassium carbonate and 2.3g of manganese carbonate in a 500mL beaker, add 200mL of ethanol, stir until dry at 50°C, grind in an agate mortar for 20min, then sinter in an air furnace at 550°C for 8h, wash with water three times, wash with alcohol three times, and dry . That is, the layered K 0.27 MnO 2 (See figure 1 , 2 ).

[0039] K prepared with Example 1 0.27 MnO 2 , Conductive carbon black and binder polyvinylidene fluoride are mixed according to the mass ratio of 80:10:10, and N-methylpyrrolidone is used as a solvent, coated on the stainless steel mesh, and vacuum-dried for 12 hours. Then take 1M sodium sulfate as electrolytic solution, activated carbon is counter electrode, and saturated calomel is the three-electrode system of reference electrode to carry out constant current (100mA / g) charge and discharge test (such as image 3 ).

Embodiment 2

[0041] Flower-like layered manganese dioxide was prepared by microwave hydrothermal heating for 10 min, which has a nano-sized morphology, and then 0.17 g layered manganese dioxide and 0.13 g potassium carbonate were placed in a 100 mL beaker, 20 mL of ethanol was added, and stirred at 50 ° C until Dry, grind with agate mortar for 20min, then sinter in an air furnace at 500°C for 10h, wash with water three times, wash with alcohol three times, and dry. That is, the layered K 0.27 MnO 2 (See Figure 4 , 5 ).

[0042] K prepared with Example 2 0.27 MnO 2 , Conductive carbon black and binder polyvinylidene fluoride are mixed according to the mass ratio of 80:10:10, and N-methylpyrrolidone is used as a solvent, coated on the stainless steel mesh, and vacuum-dried for 12 hours. Then use 1M sodium sulfate as the electrolyte, activated carbon as the counter electrode, and saturated calomel as the reference electrode for the CV test, and the scanning speed is 1mV.s -1 (see Im...

Embodiment 3

[0044] Put 3g of potassium carbonate and 4g of manganese trioxide into a ball mill jar, add an appropriate amount of acetone, and ball mill with a planetary ball mill for 8 hours, dry the sample at 50°C, then sinter in an air furnace at 700°C for 16 hours, wash with water three times, wash with alcohol three times, Dry processing. That is, the layered K 0.125 MnO 2 (See Figure 9 ).

[0045] K prepared with Example 3 0.125 MnO 2 , Conductive carbon black and binder polyvinylidene fluoride are mixed according to the mass ratio of 80:10:10, and N-methylpyrrolidone is used as a solvent, coated on the stainless steel mesh, and vacuum-dried for 12 hours. Then use 1M sodium sulfate as the electrolyte, activated carbon as the counter electrode, and a three-electrode system with saturated calomel as the reference electrode for CV (scanning speed is 1mV.s -1 ) and constant current charge and discharge test, the current intensity is 10mA / g (such as Figure 10 , Figure 11 ).

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Abstract

The invention relates to an anode material of a high-magnification aqueous alkali metal electrochemical battery and a preparation method of the anode material. The anode material is characterized is that the anode material is manganate with alkali metal of which the formula is AxMnO2, wherein A is one or two selected from Na and K; x is greater than 0 and less than 1; the crystal structure of the manganate with the alkali metal is of a layer-shaped structure. The anode material is of a nano-crystallized three-dimensional shape, the specific surface area of the material is increased, a conduction route for ions and electrons in an aqueous electrolyte is reduced, and the magnification property of an electrode material can be effectively improved.

Description

technical field [0001] The invention belongs to the technical field of new energy materials, and relates to a high-magnification layered aqueous alkali metal electrochemical cathode material and a preparation method thereof. Background technique [0002] With the development of science and technology, economy and society, energy and environmental issues have attracted more and more attention, and the demand for energy has continued to skyrocket. The shortage of fossil energy and the damage to the environment have turned the focus to renewable resources such as wind energy and solar energy. However, These renewable energy sources are greatly affected by weather and time periods, and have obvious characteristics such as instability, discontinuity, and uncontrollability. It is necessary to develop and build supporting electric energy storage (energy storage) devices to ensure the continuity and reliability of power generation and power supply. stability. Therefore, large-scale...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/50
CPCH01M4/50H01M10/24Y02E60/10
Inventor 戴翔刘阳方淳张五星黄云辉
Owner ENPOWER ENERGY TECH ANHUI CO LTD
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