Preparation method for manganese phosphate lithium nanosheet

A technology of lithium manganese phosphate and nanosheets, applied in electrical components, battery electrodes, circuits, etc., can solve the problems of unfavorable lithium ion battery energy density, slow lithium ion diffusion speed, poor conductivity, etc., and achieve high-current charging and discharging performance , easy to scale production, low cost effect

Inactive Publication Date: 2013-01-30
ZHEJIANG UNIV
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Problems solved by technology

The study found that the lithium manganese phosphate material has a moderate working voltage (4.1V), a theoretical capacity of 171mAh / g, good cycle performance, and low cost, and its energy density is 34% higher than that of lithium iron phosphate. Its high energy density and The high safety performance makes it have outstanding application prospects in power lithium-ion batteries, but its disadvantages are its poor conductivity and slow diffusion of lithium ions, which are greatly related to the microscopic morphology of lithium manganese phosphate cathode materials
At present, the industrialized lithium manganese phosphate cathode materials are basically synthesized by high-temperature solid-state method, and the microscopic appearance is block. The microscopic appearance of lithium manganese phosphate prepared in the laboratory is concentrated in diamond-shaped block and spherical shape. Not conducive to improving the energy density of lithium-ion batteries

Method used

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  • Preparation method for manganese phosphate lithium nanosheet
  • Preparation method for manganese phosphate lithium nanosheet
  • Preparation method for manganese phosphate lithium nanosheet

Examples

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example 1

[0020] 1) Measure 25ml of ethylene glycol and 25ml of deionized water and mix to form a uniform solution;

[0021] 2) Take 50ml of water / ethylene glycol mixed solvent, add 0.141g of ascorbic acid into it, fully dissolve to obtain ascorbic acid solution with a concentration of 20mmol / l;

[0022] 3) Take 15 ml of the ascorbic acid solution prepared in step 2), add 2.45 g of manganese acetate tetrahydrate and 0.98 g of phosphoric acid in sequence, and stir magnetically for 30 minutes at a speed of 2000 rpm to obtain an ascorbic acid solution of 0.25 mol / l phosphoric acid and manganese acetate;

[0023] 4) Take 15ml of the ascorbic acid solution prepared in step 2), dissolve 1.02g of lithium acetate in it, and stir magnetically for 30 minutes at a speed of 2000 rpm to obtain a lithium acetate solution;

[0024] 5) In the state of stirring, drop lithium acetate into the ascorbic acid solution of phosphoric acid and manganese acetate through a dropper at a rate of 3ml / min. The volum...

example 2

[0028] 1) Measure 37.5ml of ethylene glycol and 12.5ml of deionized water and mix to form a uniform solution.

[0029] 2) Get the mixed solvent of 50ml water / ethylene glycol, add 0.7g ascorbic acid wherein, fully dissolve, obtain ascorbic acid solution, its concentration is 100mmol / l;

[0030] 3) Take 15 ml of the ascorbic acid solution prepared in step 2), add 2.45 g of manganese acetate tetrahydrate and 0.98 g of phosphoric acid in sequence, and stir magnetically for 30 minutes at a speed of 2000 rpm to obtain an ascorbic acid solution of 0.25 mol / l phosphoric acid and manganese acetate;

[0031] 4) Take 15ml of the ascorbic acid solution prepared in step 2), dissolve 1.02g of lithium acetate in it, and stir magnetically for 30 minutes at a speed of 2000 rpm to obtain a lithium acetate solution;

[0032] 5) In the state of stirring, drop lithium acetate into the ascorbic acid solution of phosphoric acid and manganese acetate through a dropper at a rate of 6ml / min. The volume...

example 3

[0035] 1) Measure 45ml of ethylene glycol and 5ml of deionized water and mix to form a uniform solution.

[0036] 2) Get the mixed solvent of 50ml water / ethylene glycol, add 0.07g ascorbic acid wherein, fully dissolve, obtain ascorbic acid solution, its concentration is 10mmol / l;

[0037] 3) Take 15 ml of the ascorbic acid solution prepared in step 2), add 7.84 g of manganese acetate tetrahydrate and 3.14 g of phosphoric acid in sequence, and stir magnetically for 30 minutes at a speed of 2000 rpm to obtain an ascorbic acid solution of 0.80 mol / l phosphoric acid and manganese acetate;

[0038] 4) Take 15ml of the ascorbic acid solution prepared in step 2), dissolve 3.26g of lithium acetate in it, and stir magnetically for 30 minutes at a speed of 2000 rpm to obtain a lithium acetate solution;

[0039] 5) In the state of stirring, drop lithium acetate into the ascorbic acid solution of phosphoric acid and manganese acetate at a rate of 4ml / min through a dropper, the volume rati...

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Abstract

The invention relates to a preparation method for a manganese phosphate lithium nanosheet. According to the preparation method, glycol and water are used as a solvent, and polyethylene glycol is introduced, so that the formation of crystal nucleus and the growth of crystal are influenced, and as a result, the thermosynthesis of the solvent of the manganese phosphate lithium nanosheet can be achieved. The preparation method comprises the following steps of: dissolving ascorbic acid in the water/glycol solvent; then dissolving into phosphoric acid and manganese acetate in sequence; dropwise adding the water/glycol solution of manganese acetate to the previous solution containing phosphoric acid, lithium acetate and ascorbic acid; then introducing proper polyethylene glycol; fully mixing to obtain a precursor for water/solvent thermal reaction; transferring the precursor into a reaction kettle system to be sealed; thermally processing at 160 to 240 DEC G; and carrying out thermal reaction to the solvent to obtain the manganese phosphate lithium nanosheet. By adopting the preparation method, products are stable in quality, high in purity and high in dispersion of particles; the lithium ions can be dispersed well; the electrochemical performance of a lithium ion battery can be improved; and the preparation method is simple in technical process, easy to control, free of pollution, low in cost, and easy for mass production.

Description

technical field [0001] The invention relates to a preparation method of lithium manganese phosphate nanosheets, belonging to the fields of inorganic non-metallic materials and energy storage battery materials. Background technique [0002] Lithium-ion battery, as a high-performance rechargeable green power source, has been widely used in various portable electronic products and communication tools in recent years, and has been gradually developed as a power source for electric vehicles, thereby promoting its development towards safety, environmental protection, Development in the direction of low cost and high specific energy. Among them, the development of new electrode materials, especially positive electrode materials, is extremely critical. At present, the widely studied cathode materials for lithium-ion batteries focus on transition metal oxides of lithium such as LiMO with a layered structure. 2 (M=Co, Ni, Mn) and LiMn with spinel structure 2 o 4 . However, they h...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/58
CPCY02E60/12Y02E60/10
Inventor 徐刚李峰陶志鸿任召辉刘涌李翔沈鸽韩高荣
Owner ZHEJIANG UNIV
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