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Synthetic method for cathode material nano lithium manganese phosphate for lithium ion batteries

A technology of lithium ion battery and synthesis method, applied in the field of new energy and new materials, can solve the problems of long production cycle, high production cost, pollution, etc., and achieve the effects of saving energy, shortening synthesis time and shortening time.

Inactive Publication Date: 2013-11-27
SHANGHAI INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0010] The object of the present invention provides a kind of lithium-ion battery cathode material in order to overcome technical problems such as long production cycle, high production cost in the above-mentioned solid-phase synthesis process, and the generation of polluting gas caused by the decomposition of organic matter existing in the sol-gel synthesis process The synthetic method of nano manganese phosphate lithium

Method used

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  • Synthetic method for cathode material nano lithium manganese phosphate for lithium ion batteries
  • Synthetic method for cathode material nano lithium manganese phosphate for lithium ion batteries
  • Synthetic method for cathode material nano lithium manganese phosphate for lithium ion batteries

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preparation example Construction

[0034] Battery preparation and electrochemical performance testing method

[0035] (1) Preparation of battery cathode sheet :

[0036] Mix the obtained lithium-ion battery positive electrode material lithium manganese phosphate, conductive carbon powder, and organic binder polyvinylidene fluoride (PVDF) according to a mass ratio of 92:3:5 to obtain a mixed powder. 10 grams of the mixed powder, Add 12 grams of N-methylpyrrolidone (NMP) as an organic solvent, stir well to form a slurry, coat the surface of aluminum foil, dry it, and roll it several times to obtain the positive electrode sheet of the battery;

[0037] (2), battery assembly and performance testing

[0038]The electrochemical performance of obtained lithium manganese phosphate was evaluated using a 2016-type half-cell. The rolled battery pole piece is stamped into a disc with a diameter of 12 mm. After accurately weighing its mass, the mass of lithium manganese phosphate in the pole piece is calculated acco...

Embodiment 1

[0042] A method for synthesizing nano-manganese lithium phosphate as a cathode material for lithium-ion batteries. The raw materials used in the synthesis process are calculated in parts by mass, and their composition and content are as follows:

[0043] Lithium hydroxide 64 parts

[0044] Manganese sulfate 85 parts

[0045] Phosphoric acid 58 parts

[0046] PEG400 65 parts

[0047] 100 parts of deionized water;

[0048] Its synthetic method specifically comprises the following steps:

[0049] (1) Dissolve 58 parts of phosphoric acid in 20 parts of deionized water to make a phosphoric acid solution, add 65 parts of PEG400 under stirring and stir for 10 minutes to obtain a mixed solution of phosphoric acid / PEG400;

[0050] (2) Dissolve 64 parts of lithium hydroxide in 40 parts of deionized water to make lithium hydroxide aqueous solution, and add the obtained lithium hydroxide aqueous solution to the phosphoric acid / PEG400 mixed solution obtained in step (1) while stirring ...

Embodiment 2

[0058] A method for synthesizing nano-manganese lithium phosphate as a cathode material for lithium-ion batteries. The raw materials used in the synthesis process are calculated in parts by mass, and their composition and content are as follows:

[0059] Lithium hydroxide 64 parts

[0060] Manganese sulfate 85 parts

[0061] Phosphoric acid 58 parts

[0062] PEG400 80 parts

[0063] 100 parts of deionized water;

[0064] Its synthetic method specifically comprises the following steps:

[0065] (1) Dissolve 58 parts of phosphoric acid in 20 parts of deionized water to make a phosphoric acid solution, add 80 parts of PEG400 under stirring and stir for 10 minutes to obtain a mixed solution of phosphoric acid / PEG400;

[0066] (2) Dissolve 64 parts of lithium hydroxide in 40 parts of deionized water to make lithium hydroxide aqueous solution, and add the obtained lithium hydroxide aqueous solution to the phosphoric acid / PEG400 mixed solution obtained in step (1) while stirring ...

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Abstract

The invention discloses a synthetic method for a cathode material nano lithium manganese phosphate for lithium ion batteries. The method comprises a step of dissolving phosphoric acid in deionized water to obtain a phosphoric acid solution, and adding PEG 400 under stirring to obtain a phosphoric acid / PEG 400 mixed solution; a step of dissolving lithium hydroxide in deionized water to obtain an aqueous solution of the lithium hydroxide, and adding the aqueous solution of the lithium hydroxide under stirring into the phosphoric acid / PEG 400 mixed solution to obtain a white emulsion; and a step of dissolving manganese sulfate in deionized water to prepare a manganese sulfate solution, adding the manganese sulfate solution under stirring into the white emulsion to obtain a precursor emulsion, adding the precursor emulsion in a microwave reactor to perform a microwave reaction at 140-180 DEG C for 5-20 min, and then centrifuging, washing and drying to obtain the cathode material nano lithium manganese phosphate for the lithium ion batteries. The synthetic method can effectively avoid particle agglomeration and products produced have uniform particle sizes, uniform shapes and stable charge-discharge properties.

Description

technical field [0001] The invention relates to a method for synthesizing nano manganese lithium phosphate, a cathode material of a lithium ion battery, and belongs to the field of new energy and new materials. Background technique [0002] With the rapid development of the global economy, the consumption of resources is also increasing, and the crisis in the energy field is becoming more and more serious. Based on the current serious energy crisis and pollution problems, all countries in the world attach great importance to the development of electric vehicles, and my country's 863 plan also lists the development of electric vehicles as an important development direction. At present, the main candidates for power batteries are nickel-metal hydride batteries, lithium-ion batteries and fuel cells. Based on cost-effective considerations, lithium-ion batteries have greater advantages. The cathode material of lithium-ion batteries is the main bottleneck restricting the develo...

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 常程康史运伟邓玲王永强罗紫瑶汤越吕靖
Owner SHANGHAI INST OF TECH
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