A high-rate aqueous alkaline metal electrochemical cell positive electrode material and preparation method thereof

A technology of battery positive electrode and positive electrode material, which is applied to 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 low cost. low effect

Active Publication Date: 2016-09-14
ENPOWER ENERGY TECH ANHUI CO LTD +1
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  • Description
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  • Application Information

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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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  • A high-rate aqueous alkaline metal electrochemical cell positive electrode material and preparation method thereof
  • A high-rate aqueous alkaline metal electrochemical cell positive electrode material and preparation method thereof
  • A high-rate aqueous alkaline metal electrochemical cell positive electrode material and preparation method thereof

Examples

Experimental program
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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 at 50℃ to dryness, grind in an agate mortar for 20min, then sinter in an air furnace at 550℃ for 8h, wash three times with water, wash three times with alcohol, and dry. . The layered K is prepared 0.27 MnO 2 (see figure 1 , 2 ).

[0039] Using the K prepared in Example 1 0.27 MnO 2 , The conductive carbon black and the binder polyvinylidene fluoride are mixed in a 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 constant current (100mA / g) charge and discharge test (such as image 3 ).

Embodiment 2

[0041] The flower-like layered manganese dioxide was prepared by microwave hydrothermal for 10 minutes, which has a nanometer morphology, and then 0.17 g of layered manganese dioxide and 0.13 g of potassium carbonate were placed in a 100 mL beaker, adding 20 mL of ethanol, and stirring at 50°C to Dry, grind in an agate mortar for 20 minutes, then sinter in an air furnace at 500°C for 10 hours, wash three times with water, wash three times with alcohol, and dry. The layered K is prepared 0.27 MnO 2 (see Figure 4 , 5 ).

[0042] Using the K prepared in Example 2 0.27 MnO 2 , The conductive carbon black and the binder polyvinylidene fluoride are mixed in a 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. The scanning speed is 1mV.s -1 (See I...

Embodiment 3

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

[0045] Using K prepared in Example 3 0.125 MnO 2 , The conductive carbon black and the binder polyvinylidene fluoride are mixed in a 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 CV (scanning speed is 1mV.s) -1 ) And constant current charge and discharge test, current intensity 10mA / g (such as Picture 10 , Picture 11 ).

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Abstract

Provided are a high-magnification anode material of an aqueous alkali metal electrochemical cell, and preparation method thereof. The anode material is characterized in that the anode material is alkali-metal-containing manganite having the general formula AxMnO2, wherein A is one or both of Na and K, 0<x<1, and the crystal structure of the alkali-metal-containing manganite is a layered structure. The anode material has nano-crystallization three-dimensional topology, thus increasing the specific surface area of the material, reducing the transfer paths of ions and electrons in aqueous electrolyte, and effectively improving the magnification property of the electrode material.

Description

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

Claims

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Application Information

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Patent Type & Authority Patents(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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