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Preparation method of negative electrode material Mn2CoO4/poly(3,4-ethylenedioxythiophene)

A technology of ethylenedioxythiophene and negative electrode materials, which is applied in the direction of battery electrodes, secondary batteries, electrical components, etc., can solve the problems that batteries cannot realize high-current charging and discharging, limit the application range of lithium-ion batteries, and short-circuit lithium dendrites.

Inactive Publication Date: 2015-02-04
SHANGHAI NAT ENG RES CENT FORNANOTECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003]Since the early 1990s, Japanese scientific and technological workers have developed layered carbon materials. Carbon materials were the first to be studied and applied to lithium-ion The materials for commercialization of batteries are still one of the focuses of everyone's attention and research, but there are some defects in carbon negative electrode materials: when the battery is formed, it reacts with the electrolyte to form an SEI film, resulting in the consumption of the electrolyte and low initial Coulombic efficiency ; When the battery is overcharged, metal lithium may be precipitated on the surface of the carbon electrode, forming lithium dendrites to cause a short circuit, causing the temperature to rise and the battery to explode; in addition, the diffusion coefficient of lithium ions in the carbon material is small, resulting in the failure of the battery to achieve large Current charge and discharge, thus limiting the application range of lithium-ion batteries

Method used

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  • Preparation method of negative electrode material Mn2CoO4/poly(3,4-ethylenedioxythiophene)
  • Preparation method of negative electrode material Mn2CoO4/poly(3,4-ethylenedioxythiophene)
  • Preparation method of negative electrode material Mn2CoO4/poly(3,4-ethylenedioxythiophene)

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Embodiment 1

[0026] (1) Dissolve manganese acetate and cobalt acetate in deionized water at a molar volume of 0.01 mol: 0.005 mol; (2) Add a small amount of 0.015 -0.030 mol ethylenediaminetetraacetic acid (EDTA)-polyacrylic acid (PPA) double chelating agent Wet with deionized water, add 0.15 mol (12 ml) ammonia water, shake until a colorless and transparent solution is formed, then add the colorless and transparent double chelating agent EDTA-PPA solution into the saline solution to form a transparent solution, heat and stir at 80 ℃ until the formation gel. (3) Heat and dry the gel material in a blast oven at 240°C for 5 hours; (4) Grind the precursor and calcinate it in a muffle furnace at 600°C for 10 hours at a heating rate of 5°C / min to obtain Mn 2 CoO 4 . (5) Dissolve 0.4 g of iron p-toluenesulfonate hexahydrate in 1 ml of absolute ethanol to a yellow transparent solution that is uniformly stirred, and then add 0.5 g of Mn 2 CoO 4 Add to this solution and stir until evenly spread...

Embodiment 2

[0029] (1) Dissolve manganese acetate and cobalt acetate in deionized water at a molar volume of 0.01 mol: 0.005 mol; (2) Add a small amount of 0.015-0.030 mol ethylenediaminetetraacetic acid (EDTA)-citric acid (CA) double chelating agent Wet with deionized water, add 0.15 mol (12 ml) of ammonia water, shake until a colorless and transparent solution is formed, then add the colorless and transparent double chelating agent EDTA-CA solution into the saline solution to form a transparent solution, heat and stir at 70°C until it forms gel. (3) Heat and dry the gel material in a blast oven at 240°C for 5 hours; (4) Grind the precursor and calcinate it in a muffle furnace at 800°C for 5 hours at a heating rate of 2°C / min to obtain Mn 2 CoO 4 . (5) Dissolve 0.4 g of iron p-toluenesulfonate hexahydrate in 1 ml of acetone until a uniformly stirred yellow transparent solution is obtained, and then add 0.5 g of Mn 2 CoO 4 Add to this solution and stir until evenly spread on a clean g...

Embodiment 3

[0031](1) Dissolve manganese acetate and cobalt acetate in deionized water at a molar volume of 0.01 mol: 0.005 mol; (2) Add a small amount of deionized water to 0.015 -0.030 mol of ethylenediaminetetraacetic acid (EDTA)-acetylacetone double chelating agent Wet, add 0.15 mol (12 ml) ammonia water, shake until a colorless and transparent solution is formed, then add the colorless and transparent double chelating agent EDTA-acetylacetone solution into the saline solution to form a transparent solution, heat and stir at 80°C until a gel is formed . (3) Heat and dry the gel material in a blast oven at 200 °C for 5 hours; (4) Grind the precursor and calcinate it in a muffle furnace at 850 °C for 5 hours at a heating rate of 2 °C / min to obtain Mn 2 CoO 4 . (5) Dissolve 0.2 g of iron p-toluenesulfonate hexahydrate in 0.5 ml of acetone until a uniformly stirred yellow transparent solution is obtained, and then add 0.25 g of Mn 2 CoO 4 Add to this solution and stir until evenly spr...

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Abstract

The invention provides a preparation method of a lithium ion secondary battery negative electrode material composite oxide Mn2CoO4 / poly(3,4-ethylenedioxythiophene) (PEDOT). The method comprises the steps of synthesizing Mn2CoO4 through a sol-gel process by using a manganese salt, a cobalt salt and an organic chelating reagent as raw materials, carrying out vapor deposition polymerization on EDOT to form PEDOT, and compounding the PEDOT with the Mn2CoO4 material. Mn2CoO4 particles synthesized through the method are small, have uniform dimension sizes and form a three dimensional netted structure, so the specific surface area of the material is increased, and the PEDOT is an excellent conductive polymer and has high conductivity, so the electrochemical performances of the composite negative electrode material are improved, has the advantages of simple preparation method and low cost, and is a promising material.

Description

technical field [0001] The invention relates to a preparation method of a battery electrode material, in particular to a preparation method of manganese cobalt oxide compounded with poly-3,4-ethylenedioxythiophene, a negative electrode material of a lithium ion secondary battery. Background technique [0002] With the development of society, lithium-ion batteries have attracted much attention. Lithium-ion battery is currently the most ideal rechargeable battery in the world. It not only has the advantages of high energy density, long cycle life, no memory effect and low pollution. With the advancement of technology, lithium-ion batteries will be widely used in fields such as electric vehicles, aerospace and biomedicine. Therefore, the research and development of lithium-ion batteries and related materials for power is of great significance. For lithium-ion batteries for power, the key is to increase the power density and energy density, and the root of the increase in power...

Claims

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Application Information

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IPC IPC(8): H01M4/52H01M4/62
CPCH01M4/50H01M4/52H01M4/624H01M10/0525Y02E60/10
Inventor 何丹农吴晓燕张春明王丹严鹏杨扬
Owner SHANGHAI NAT ENG RES CENT FORNANOTECH
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