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Preparation method of composite oxide AB2O4 for lithium ion secondary battery cathode material

A composite oxide, AB2O4 technology, applied in the field of preparation of composite oxide AB2O4 for lithium-ion secondary battery negative electrode materials, can solve the problems of small diffusion coefficient of lithium ions, short circuit of lithium dendrites, electrolyte consumption and other problems, and achieve improvement The effects of electrochemical performance, increased specific surface area, and simple preparation process

Inactive Publication Date: 2014-09-03
SHANGHAI NAT ENG RES CENT FORNANOTECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, most commercial lithium-ion battery anode materials use carbon anode materials, but carbon anode materials have some defects: when the battery is formed, it reacts with the electrolyte to form an SEI film, resulting in consumption of the electrolyte and low initial coulombic efficiency; When the battery is overcharged, metallic lithium may be precipitated on the surface of the carbon electrode, forming lithium dendrites to cause a short circuit, resulting in an increase in temperature and an explosion of the battery; in addition, the diffusion coefficient of lithium ions in the carbon material is small, which makes the battery unable to achieve high current. charge and discharge, thus limiting the application range of lithium-ion batteries

Method used

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  • Preparation method of composite oxide AB2O4 for lithium ion secondary battery cathode material
  • Preparation method of composite oxide AB2O4 for lithium ion secondary battery cathode material

Examples

Experimental program
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Effect test

Embodiment 1

[0022] Dissolve cobalt acetate and nickel acetate in deionized water at a molar ratio of 0.01 mol: 0.005 mol; Wet with ionic 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°C until a gelatinous solution is formed. glue. (3) Pre-freeze the gel material in a freezer at -80°C for 1 h; (4) Transfer the pre-frozen material into a freeze-drying device and vacuum freeze-dry for 2 days. (5) Transfer the freeze-dried material into a muffle furnace and calcinate at 650 °C for 5 h with a heating rate of 5 °C / min.

[0023] figure 1 It is the SEM picture of the material, it can be seen from the picture that the particle size distribution of the material is relatively uniform, and the particle size is about 100 nm; figure 2 It is the electrochemical performance diagram of the ma...

Embodiment 2

[0025] Dissolve cobalt nitrate and zinc nitrate in deionized water at a molar ratio of 0.01 mol: 0.005 mol; Wet with ionic 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 saline solution to form a transparent solution, heat and stir at 70°C until a gelatinous solution is formed. glue. (3) Pre-freeze the gel material in a freezer at -20°C for 1 h; (4) Transfer the pre-frozen material into a freeze-drying device and vacuum freeze-dry for 1 day. (5) The freeze-dried material was transferred into a muffle furnace and calcined at 600 °C for 5 h with a heating rate of 2 °C / min.

[0026]

Embodiment 3

[0028] Dissolve manganese acetate and cobalt acetate in deionized water at a molar ratio of 0.01 mol: 0.005 mol; Wet with ionic 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 saline solution to form a transparent solution, heat and stir at 70°C until a gelatinous solution is formed. glue. (3) Pre-freeze the gel material in a freezer at -20°C for 1 h; (4) Transfer the pre-frozen material into a freeze-drying device and vacuum freeze-dry for 1 day. (5) Transfer the freeze-dried material into a muffle furnace and calcinate at 600 °C for 5 h with a heating rate of 2 °C / min.

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Abstract

The invention provides a preparation method of a composite oxide AB2O4 (A equals to Mn, Co, Ni, Cu, Zn; B equals to Mn, Fe, Co, Ni, Zn; and A is not equal to B) for lithium ion secondary battery cathode material. The invention uses A, B metal salts and an organic chelating agent as raw materials and employs a sol gel and freeze-drying combined method for synthesis of AB2O4. The AB2O4 synthesized by the method has small particle size and uniform particle size, forms a three-dimensional network structure, and increases the specific surface area of the material, so as to improve the electrochemical performance of the cathode material; and the preparation process is simple and low in cost. The composite oxide AB2O4 is considered to be a promising material.

Description

technical field [0001] The invention relates to a composite oxide AB used for negative electrode materials of lithium ion secondary batteries 2 o 4 The preparation method, using the method of combining modified sol-gel and freeze-drying technology to synthesize the negative electrode material AB 2 o 4 . Background technique [0002] With the rapid development of smaller, lighter and higher-performance electronic and communication devices, people have put forward higher and higher requirements on the performance of the batteries that power these devices, especially the specific energy. However, the specific capacity of currently commercialized lithium-ion batteries and MH / Ni batteries has been difficult to continue to improve. Therefore, there is an urgent need to develop batteries with higher specific energy. Lithium-ion secondary batteries have the advantages of high energy density, no memory effect, and small self-discharge. As a high-energy chemical power source, the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/1391
CPCY02E60/122H01M4/483H01M4/502H01M4/523H01M10/0525Y02E60/10
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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