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Preparation method for mono-dispersed lithium iron phosphate and lithium ferrocobalt phosphate core-shell structured composite cathode material

A composite positive electrode material, lithium cobalt iron phosphate technology, applied in nanotechnology, structural parts, battery electrodes, etc. for materials and surface science, can solve the problems of small discharge point specific capacity, low energy density, high reaction temperature, etc. To achieve the effect of rapid reaction, shortened reaction time and short synthesis time

Inactive Publication Date: 2016-01-20
BRIGHAUN EV TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The object of the present invention is to aim at the deficiencies of the prior art, and provide a kind of preparation method of monodisperse lithium iron phosphate and cobalt lithium iron phosphate core-shell structure composite cathode material, well solve the long reaction time in the prior art, High reaction temperature, low energy density, small discharge point specific capacity, large energy waste, etc.

Method used

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  • Preparation method for mono-dispersed lithium iron phosphate and lithium ferrocobalt phosphate core-shell structured composite cathode material
  • Preparation method for mono-dispersed lithium iron phosphate and lithium ferrocobalt phosphate core-shell structured composite cathode material
  • Preparation method for mono-dispersed lithium iron phosphate and lithium ferrocobalt phosphate core-shell structured composite cathode material

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preparation example Construction

[0053] Battery preparation and electrochemical performance testing method

[0054] ①. Preparation of battery positive electrode sheet:

[0055] Mix the obtained lithium-ion battery cathode material, conductive carbon powder, and organic binder polyvinylidene fluoride (PVDF) according to a mass ratio of 80:10:10 to obtain a mixed split, and add an appropriate amount of organic solvent N to the mixed powder. Methylpyrrolidone (NMP), fully stirred to form a slurry, coated with the surface of aluminum foil, dried and rolled several times to obtain the positive electrode sheet of the battery;

[0056] ②, battery assembly and performance testing

[0057] The electrochemical performance of lithium iron phosphate and lithium cobalt iron phosphate core-shell structure composite cathode materials was evaluated using 2016 type half cells. The rolled battery pole piece is stamped into a disc with a diameter of 12 mm. After accurately weighing its mass, the mass of the positive electrode...

Embodiment 1

[0059] Embodiment 1: A method for synthesizing monodisperse lithium iron phosphate and cobalt lithium iron phosphate core-shell structure composite cathode material, specifically comprising the following steps:

[0060] (1), 58 parts of mass fractions are that 85% phosphoric acid joins 200 parts of deionized water, stir and be mixed with phosphoric acid solution, 63 parts of lithium hydroxide are dissolved in 400 parts of deionized water and are mixed with lithium hydroxide solution, will 139 parts of ferrous sulfate are dissolved in 400 parts of deionized water to prepare ferrous sulfate solution. Pour the phosphoric acid solution into 667 parts of PEG400 first, stir and mix evenly, slowly lithium hydroxide solution under stirring state, let it react for 0.5h, add ferrous sulfate solution under stirring state, pour it into Reactor, and placed in a microwave reactor to react at 160 ° C for 20 minutes, after the reaction is completed and cooled, the product is washed and dried,...

Embodiment 2

[0068] A method for synthesizing monodisperse lithium iron phosphate and cobalt lithium iron phosphate core-shell structure composite positive electrode materials, specifically comprising the following steps:

[0069] (1), step (1) is identical with the step (1) of embodiment 1;

[0070] (2) Disperse 4 parts of the lithium iron phosphate core material A prepared in step (1) in 10 parts of deionized water to form a lithium iron phosphate suspension. Add 55 parts of phosphoric acid with a mass fraction of 85% to 200 parts of deionized water to prepare a phosphoric acid solution. Dissolve 67 parts of lithium hydroxide in 400 parts of deionized water to prepare a lithium hydroxide solution. Slowly add the lithium iron phosphate core material suspension to 750 parts of PEG400. After stirring evenly, add the above phosphoric acid solution under the stirring turntable, and then slowly add the above lithium hydroxide solution. Emulsion B;

[0071] (3), step (3) is identical with th...

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Abstract

The invention relates to a preparation method for a mono-dispersed lithium iron phosphate and lithium ferrocobalt phosphate core-shell structured composite cathode material. A core material of the core-shell structured cathode material is lithium iron phosphate and is obtained by a solvothermal synthesis method, and a shell material of the core-shell structured cathode material is a lithium ferrocoablt phosphate material and is obtained by the solvothermal synthesis method and growing the lithium ferrocoablt phosphate material on the surface of the lithium iron phosphate core material. By the preparation method, the problems of long reaction time, high reaction temperature, low energy density, low discharge specific capacity, large energy waste and the like in the prior art are solved better.

Description

Technical field: [0001] The invention relates to the field of positive electrode materials for lithium ion batteries, in particular to a method for preparing monodisperse lithium iron phosphate and lithium cobalt iron phosphate core-shell structure composite positive electrode materials. Background technique: [0002] In the 21st century, human beings are facing two serious problems of energy crisis and environmental pollution, so the development and research of clean and renewable new energy has far-reaching significance. Among them, all kinds of vehicles account for about 40% of oil consumption, and 42% of global air pollution comes from the emissions of traffic vehicles. On June 1, 2010, the National Development and Reform Commission and other four ministries and commissions jointly issued the "Notice on Launching the Pilot Program of Subsidies for Private Purchase of New Energy Vehicles", and decided to start the pilot program of subsidies for private purchases of new en...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/58H01M10/0525B82Y30/00
CPCB82Y30/00H01M4/366H01M4/5825H01M10/0525Y02E60/10
Inventor 黄科竣曹瑾玮
Owner BRIGHAUN EV TECH CO LTD
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