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Preparation method of lithium ion secondary battery negative material manganese cobalt oxide

A secondary battery and negative electrode material technology, applied in battery electrodes, chemical instruments and methods, circuits, etc., can solve the problems of complex preparation methods, voltage hysteresis, and low initial charge and discharge efficiency

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

AI Technical Summary

Problems solved by technology

[0003] Since the early 1990s, Japanese scientific and technological workers have developed carbon materials with a layered structure. Most of the commercialized lithium-ion anode materials use various lithium-intercalated carbon materials, which are still one of the focuses of everyone’s attention and research. However, there are some defects in carbon negative electrode materials: lithium dendrites are precipitated; the first charge and discharge efficiency is low; it interacts with the electrolyte; there is obvious voltage hysteresis; the preparation method is relatively complicated, which limits the application range of lithium-ion batteries

Method used

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  • Preparation method of lithium ion secondary battery negative material manganese cobalt oxide
  • Preparation method of lithium ion secondary battery negative material manganese cobalt oxide

Examples

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Embodiment 1

[0023] (1) Dissolve manganese acetate and cobalt acetate in deionized water at 0.01 mol: 0.005 mol, and magnetically stir until completely dissolved; then 0.015 mol-0.030 mol of ethylenediaminetetraacetic acid (EDTA)-polyacrylic acid (PPA) Add a small amount of deionized water to the double chelating agent to moisten, 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 to the inorganic salt solution to form a transparent solution; (2) The obtained solution was dried using a spray dryer with an inlet temperature of 180 °C and an outlet temperature of 100 °C; (3) The solution was injected with a peristaltic pump at a flow rate of 15 mL min -1 ;(4) The nozzle gas flow is controlled by an air compressor pump, and the flow rate is 350 L h -1 (5) The outlet air is evacuated through the outlet filter, and the powder obtained by spray drying is calcined at 800°C ...

Embodiment 2

[0025] (1) Dissolve manganese acetate and cobalt acetate in deionized water at a molar volume of 0.01 mol: 0.005 mol, and add a small amount of deionized chelating agent of 0.015 mol-0.030 mol ethylenediaminetetraacetic acid (EDTA)-citric acid (CA) Wet with 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-CA solution into the inorganic salt solution to form a transparent solution; (2) The obtained solution is sprayed The dryer was used for drying, the inlet temperature was 180 °C, and the outlet temperature was 120 °C; (3) The solution was injected with a peristaltic pump at a flow rate of 20 mL min -1 ;(4) The nozzle gas flow is controlled by an air compressor pump, and the flow rate is 400 L h -1 (5) The outlet air is evacuated through the outlet filter, and the powder obtained by spray drying is calcined at 800 °C to obtain the desired product Mn 2 CoO ...

Embodiment 3

[0027] (1) Dissolve manganese acetate and cobalt acetate in deionized water at 0.01 mol: 0.005 mol, add a small amount of deionized water to 0.015 mol-0.030 mol ethylenediaminetetraacetic acid (EDTA)-acetylacetone double chelating agent , 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 inorganic salt solution to form a transparent solution, heat and stir at 80°C until a gel is formed. (2) The obtained solution was dried using a spray dryer with an inlet temperature of 200 °C and an outlet temperature of 120 °C; (3) The solution was injected with a peristaltic pump at a flow rate of 20 mL min -1 ;(4) The nozzle gas flow is controlled by an air compressor pump, and the flow rate is 400 L h -1 (5) The outlet air is evacuated through the outlet filter, and the powder obtained by spray drying is calcined at 800°C to obtain the desired pr...

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Abstract

The invention provides a preparation method of a lithium ion secondary battery negative material manganese cobalt oxide. The method comprises the following steps: dissolving a manganese salt and a cobalt salt in an uniform medium, magnetically stirring until complete dissolving, adding a bifunctional chelating agent into deionized water to wet the bifunctional chelating agent, adding ammonia water, shaking to form a colorless transparent solution, and adding the colorless transparent bifunctional chelating agent solution into an aqueous solution of an inorganic salt to form a transparent solution; and drying the finally obtained solution by a spray dryer to obtain powder, and calcining the powder at 700-850DEG C to obtain the required product manganese cobalt oxide (Mn2CoO4). Synthesized Mn2CoO4 particles are small and have a uniform dimension size, so the specific surface area of the material is increased, thereby the electrochemical performances of the negative material are improved; and the material also has the advantages of simple preparation method and low cost, and is a promising material.

Description

technical field [0001] The invention designs a method for preparing battery electrode materials, in particular a method for preparing manganese cobalt oxide, a negative electrode material for lithium ion secondary batteries. Background technique [0002] With the gradual depletion of oil, coal and other resources, the energy crisis has become one of the problems that human beings must solve in the future. At present, green, pollution-free and high-energy chemical power sources have become a hot spot in research and development in various countries. Lithium-ion batteries have attracted widespread attention due to their high voltage, high specific energy, long life, no memory effect, and low self-discharge capacity. Widely used in optoelectronics, information, transportation, national defense and military and other fields. With the rapid development of miniaturization and miniaturization of electronic products and the urgent requirement of multifunctional portable and high-e...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/50H01M4/52C01G51/00
CPCC01G51/00H01M4/50H01M4/52H01M2004/021Y02E60/10
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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