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Spherical porous lithium manganate and preparation method and application thereof

A porous lithium manganese oxide, spherical technology, applied in the field of spherical porous lithium manganate and its preparation, can solve the problems of strict restrictions on manganese salts and lithium salts, potential safety hazards, complex processes, etc., to achieve good electrochemical performance, The effect of stable structure and mild preparation process

Active Publication Date: 2019-02-12
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Patent CN102931393B is a lithium manganate cathode material with a porous spherical structure and its preparation method. It is necessary to first calcinate the manganese carbonate powder to obtain a porous spherical manganese trioxide precursor, and then mix the precursor with lithium hydroxide evenly before calcining to obtain porous Spherical lithium manganate, the method requires two calcinations, the process is complex, and the restrictions on manganese salt and lithium salt are relatively strict; the preparation method of patent CN104409719B porous spherical lithium manganate positive electrode material, wherein sodium carbonate and sodium hydroxide aqueous solution are used to treat manganese Salt is precipitated, and then the precipitate is mixed with lithium carbonate and roasted to form a porous lithium manganate material. This method uses a strong base, which is prone to safety hazards, and the lithium salt can only use lithium carbonate, which is relatively simple

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  • Spherical porous lithium manganate and preparation method and application thereof
  • Spherical porous lithium manganate and preparation method and application thereof
  • Spherical porous lithium manganate and preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0042] Solution A: Dissolve 0.49g of manganese acetate and 3g of polyvinylpyrrolidone in a mixed solvent of 50mL of deionized water and 50ml of ethanol, and stir until the solution is clear. Solution B: Dissolve 1.65 g of trimesic acid in a mixed solvent of 50 mL of deionized water and 50 mL of ethanol, and stir until the solution becomes clear. Then add solution B to solution A, react at room temperature for 24 hours, then centrifuge and dry to obtain an organic compound of manganese. Take 2g of lithium hydroxide and add it to the manganese organic compound, ball mill it evenly, and heat it at 500°C for 5 hours to get spherical porous lithium manganese oxide.

[0043] figure 1 It is the XRD figure of the organic compound of manganese in embodiment 1. It can be seen from the figure that there are no miscellaneous peaks, and the substance was successfully synthesized on the surface.

[0044] figure 2 It is the XRD figure of the lithium manganate (b) prepared in the purchas...

Embodiment 2

[0051] Solution A: Dissolve 0.6g of manganese chloride and 3g of polyvinylpyrrolidone in a mixed solvent of 50mL of deionized water and 50ml of ethanol, and stir until the solution is clear. Solution B: Dissolve 2.13g of terephthalic acid in a mixed solvent of 50mL of deionized water and 50ml of ethanol, and stir until the solution is clear. Then add solution B to solution A, react at room temperature for 10 hours, then centrifuge and dry to obtain the organic compound of manganese. Take 1.4g of lithium carbonate and add it to the manganese organic compound, ball mill it evenly, and heat it at 700°C for 10h to get spherical porous lithium manganese oxide. The particle diameter of the prepared lithium manganate is 110-160nm, and the pore diameter range is 250-300nm. Spherical porous LiMnO maintains a capacity of 102 mAh g after 100 cycles -1 .

Embodiment 3

[0053] Solution A: Dissolve 0.69g of manganese nitrate and 3g of polyvinylpyrrolidone in a mixed solvent of 50mL of deionized water and 50ml of ethanol, and stir until the solution is clear. Solution B: Dissolve 1.65 g of trimellitic acid in a mixed solvent of 50 mL of deionized water and 50 mL of ethanol, and stir until the solution is clear. Then add solution B to solution A, react at room temperature for 1 hour, then centrifuge and dry to obtain an organic compound of manganese. Take 1.2g of lithium sulfate and add it to the organic compound of manganese, ball mill it evenly, and heat it at 900°C for 5 hours to obtain spherical porous lithium manganese oxide. The particle diameter of the prepared lithium manganate is 150-180nm, and the pore diameter range is 200-300nm. Spherical porous LiMnO maintains a capacity of 99 mAh g after 100 cycles -1 .

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Abstract

The invention discloses spherical porous lithium manganate and a preparation method and application thereof. The method comprises the following steps that 1, a manganese source and an organic ligand are added into a solvent according to a set ratio, and a mixture is mixed evenly for reaction to obtain an organic compound of manganese, wherein the organic ligand is one or a mixture of at least twoof trimesic acid, trimellitic acid, terephthalic acid, isophthalic acid, benzoic acid, methylimidazole and polyvinylpyrrolidone; 2, after the separated dried organic compound of the manganese and a lithium source are mixed evenly, calcination is conducted to obtain the spherical porous lithium manganate. A preparation technology of the lithium manganate is mild, environmentally friendly, controllable and suitable for large-scale production, and raw material kinds of the manganese source and the lithium source are numerous.

Description

technical field [0001] The invention relates to the field of chemical batteries, in particular to a spherical porous lithium manganese oxide and its preparation method and application. Background technique [0002] Lithium-ion battery is a new generation of green high-energy battery. It has the advantages of high working voltage, light weight, high volume specific energy, and no environmental pollution. The power supply has broad application prospects and huge economic benefits. [0003] In the composition of lithium-ion batteries, the cathode material is an important factor that determines its safety performance, electrochemical performance and future development direction. In the current commercialized lithium-ion batteries, lithium cobaltate is mainly used as the positive electrode material, with some lithium nickelate and lithium manganate, and a small amount of ternary materials. Lithium cobaltate is expensive and has low safety performance; lithium nickelate is diffi...

Claims

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Application Information

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IPC IPC(8): C01G45/12H01M4/505H01M10/0525
CPCC01G45/1214C01P2002/72C01P2004/03H01M4/505H01M10/0525Y02E60/10
Inventor 冯金奎安永灵
Owner SHANDONG UNIV
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