A lithium-ion battery positive electrode material iron manganese magnesium lithium phosphate and preparation method thereof

A technology of iron, manganese, magnesium, lithium and lithium ion batteries, which is applied in the field of materials, can solve problems such as poor electrical conductivity, and achieve the effects of improved electrochemical performance, good safety, and excellent electrical conductivity

Active Publication Date: 2017-01-04
SHANDONG GOLDENCELL ELECTRONICS TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the common problem of such materials is poor electrical conductivity. In order to improve the electrochemical performance of materials, people have used many methods to solve this problem, such as:

Method used

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  • A lithium-ion battery positive electrode material iron manganese magnesium lithium phosphate and preparation method thereof
  • A lithium-ion battery positive electrode material iron manganese magnesium lithium phosphate and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Weigh a certain amount of lithium carbonate, ferric nitrate, manganous acetate, magnesium acetate, and ammonium dihydrogen phosphate at a molar ratio of 1.05:0.5:0.45:0.05:1, then add glucose with a mass fraction of 13% and ball mill it in a ball mill for 2 hours. The uniformly mixed iron, manganese, magnesium, and lithium precursors were put into a microwave oven, and after 5 minutes of microwave treatment, they were left to be calcined. Control the heating rate at 10°C / min, calcinate the compounded precursor powder at 650°C for 12h under the protection of nitrogen atmosphere, and cool to room temperature with the furnace to obtain carbon-coated LiFe 0.5 mn 0.45 Mg 0.05 PO 4 Cathode material.

[0023] The prepared lithium manganese magnesium phosphate is used as the positive electrode material of the lithium ion battery, acetylene black is used as the conductive agent, and polyvinylidene fluoride is used as the binder to make the positive electrode sheet, and metal ...

Embodiment 2

[0025] Weigh a certain amount of lithium carbonate, iron phosphate, manganous acetate, magnesium oxide, and ammonium dihydrogen phosphate at a molar ratio of 1.1:0.5:0.45:0.05:1, then add starch with a mass fraction of 10% in a ball mill for 1 hour, and mix The uniform iron, manganese, magnesium, and lithium precursors were placed in a microwave oven, and after 10 minutes of microwave compounding treatment, they were left to be calcined. Control the heating rate at 11°C / min, calcinate the compounded precursor powder at 750°C for 10 hours under the protection of nitrogen atmosphere, and cool to room temperature with the furnace to obtain carbon-coated LiFe 0.5 mn 0.45 Mg 0.05 PO 4 Cathode material.

Embodiment 3

[0027]Weigh a certain amount of lithium carbonate, iron oxide, manganese carbonate, magnesium acetate, and ammonium dihydrogen phosphate at a molar ratio of 1.08:0.5:0.45:0.05:1, then add 8% sucrose in a ball mill for 5 hours, and mix well The final iron, manganese, magnesium, and lithium phosphate precursors were put into a microwave oven, and after 16 minutes of microwave compounding treatment, they were left to be calcined. Control the heating rate at 8°C / min, calcinate the compounded precursor powder at 800°C for 8 hours under the protection of nitrogen atmosphere, and cool to room temperature with the furnace to obtain carbon-coated LiFe 0.5 mn 0.45 Mg 0.05 PO 4 Cathode material.

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Abstract

A lithium-ion battery positive electrode material iron manganese magnesium magnesium phosphate and its preparation method, the chemical general formula of iron manganese magnesium magnesium lithium phosphate is LiFe0.5Mn0.45Mg0.05PO4, the molar ratio is 1.0-1.2:0.5:0.45:0.05:1 Get lithium source, iron source, manganese source, magnesium source, phosphorus source in the ball mill tank, add carbon source, use distilled water as dispersant, place ball mill in ball mill, make iron manganese magnesium magnesium lithium precursor; Put it into a microwave oven, dry it with microwave treatment for 2~20 minutes, and then leave it for calcination; the precursor powder after microwave treatment is controlled at a heating rate of 5~12°C / min under the protection of an inert gas atmosphere, at 500~850 Calcining at ℃ for 3~15h, and finally cooling to room temperature with the furnace, the doped carbon-coated iron, manganese, magnesium, and lithium cathode materials can be obtained.

Description

technical field [0001] The invention belongs to the preparation method of battery positive electrode materials in the field of materials, and in particular relates to a lithium ion battery positive electrode material iron manganese magnesium lithium phosphate and a preparation method thereof. Background technique [0002] With the development of social economy and the improvement of human living standards, the demand for energy in various countries is increasing day by day, while the reduction of traditional fossil energy (coal, oil, natural gas) and the deterioration of the earth's environment have become two major obstacles for human survival and development. Obstacles, searching for new energy sources, and developing energy-saving and environment-friendly energy storage and conversion devices have become one of the hot topics of research in various countries. As a device for mutual conversion of chemical energy and electrical energy, battery is an important medium for rat...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/136H01M4/1397
Inventor 关成善宗继月孟博王颖
Owner SHANDONG GOLDENCELL ELECTRONICS TECH
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