Preparation method for positive electrode material lithium cobalt iron phosphate for lithium ion battery

A lithium ion battery, lithium cobalt iron phosphate technology, applied in the field of materials science, can solve the problems affecting the stability of LiCoPO4, affecting the crystal structure and lattice parameters, etc., to improve the electrical conductivity and ion migration rate, suppress agglomeration, and improve electrical conductivity. rate effect

Inactive Publication Date: 2016-09-21
SHANGHAI INSTITUTE OF TECHNOLOGY
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

However, metal ion doping will affect LiCoPO to varying degrees. 4 The crystal

Method used

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  • Preparation method for positive electrode material lithium cobalt iron phosphate for lithium ion battery
  • Preparation method for positive electrode material lithium cobalt iron phosphate for lithium ion battery
  • Preparation method for positive electrode material lithium cobalt iron phosphate for lithium ion battery

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preparation example Construction

[0076] Battery preparation and electrochemical performance test method

[0077] (1) Preparation of battery positive sheet

[0078] The obtained cathode material for lithium ion battery lithium cobalt iron phosphate / carbon composite material, conductive carbon powder, and organic binder polyvinylidene fluoride (PVDF) are mixed according to a mass ratio of 8:1:1 to obtain a mixed powder. Mix 10 grams of powder, add 35 grams of organic solvent N-methylpyrrolidone (NMP), stir thoroughly to form a slurry, coat it on the surface of the aluminum foil, dry it, and roll it several times to obtain a battery positive electrode sheet;

[0079] (2) Battery assembly and performance test

[0080] The electrochemical performance of the lithium cobalt iron phosphate / carbon composite material was evaluated using a 2016 type half-cell. The rolled battery pole pieces are stamped into 12 mm diameter discs. After accurately weighing their mass, the mass of the lithium cobalt iron phosphate / carbon composit...

Embodiment 1

[0083] A method for synthesizing lithium cobalt iron phosphate / carbon composite material, which is a positive electrode material for lithium ion batteries, specifically includes the following steps:

[0084] (1) Add 115 parts by weight of phosphoric acid to 400 parts by weight of deionized water to prepare a phosphoric acid solution, and control the temperature of the solution to 50-60°C. Under stirring, 5.5 parts by weight of reduced iron powder was added and reacted for 2 hours to obtain mixed solution A.

[0085] (2) Dissolve 42 parts by weight of lithium hydroxide in 200 parts by weight of deionized water to form a lithium hydroxide solution, and then slowly add the lithium hydroxide solution dropwise to the mixed solution A obtained in step (1), and keep The solution is in a clear state. After the solution is naturally cooled to room temperature, it is added to the nano ball mill, and then 83 parts by weight of cobalt hydroxide are added. After ball milling for 3 hours, 80 par...

Embodiment 2

[0091] A method for synthesizing a lithium-ion battery cathode material lithium cobalt iron phosphate / carbon composite material, which specifically includes the following steps:

[0092] (1) Add 115 parts by weight of phosphoric acid to 400 parts by weight of deionized water to prepare a phosphoric acid solution, and control the temperature of the solution to 50-60°C. Under stirring, 8.5 parts by weight of reduced iron powder was added and reacted for 2 hours to obtain mixed solution A.

[0093] (2) Dissolve 42 parts of lithium hydroxide in 200 parts of deionized water to form a lithium hydroxide solution, and then slowly add the lithium hydroxide solution to the mixed solution A obtained in step (1), keeping the solution in a clear State, after the solution is naturally cooled to room temperature, add into the nano ball mill, then add 78 parts by weight of cobalt hydroxide, after ball milling for 3 hours, then add 120 parts by weight of caramel solution with a concentration of 20%...

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Abstract

The invention provides a preparation method for a positive electrode material lithium cobalt iron phosphate for a lithium ion battery. The chemical formula of lithium cobalt iron phosphate is LiFe<x>Co<1-x>PO<4>/C, wherein x is greater than or equal to 0.1 and less than or equal to 0.2; the preparation method comprises the steps of adding phosphoric acid into deionized water to prepare a phosphoric acid solution; adding reduced iron powder under a stirring state, enabling the mixture to be reacted to obtain a clear mixed solution; adding a lithium hydroxide solution to the mixed solution; after the solution is cooled, adding the cooled solution to a nanometer ball mill, and adding cobalt hydroxide; carrying out ball milling on the mixture, and then adding a caramel solution, stirring uniformly the ball-milled product, and spraying and drying the product to obtain a spherical lithium cobalt iron phosphate/carbon composite material precursor powder; and calcining the precursor powder at a temperature of 600-700 DEG C under a nitrogen atmosphere to obtain the positive electrode material for the lithium ion battery. The positive electrode material for the lithium ion battery obtained by the invention has relatively high energy density and high cycle performance, and can be expected to be the new generation of high-energy-density positive electrode material for the lithium ion battery.

Description

Technical field [0001] The invention belongs to the field of materials science, and relates to a lithium battery cathode material, in particular to a preparation method of lithium cobalt iron phosphate cathode material for lithium ion batteries. Background technique [0002] The energy crisis and environmental pollution force people to look for new and clean energy storage materials. Among various energy storage materials, lithium-ion batteries are recognized as the most ideal battery. In order to meet the current market's urgent demand for power lithium batteries, the research and development of new high-energy power lithium batteries has received increasing attention. Among various cathode materials for lithium-ion batteries, lithium iron phosphate (LiFePO 4 ) Has been well developed. The well-known automobile manufacturer BYD uses LiFePO 4 It is a positive electrode material for power battery. But LiFePO 4 There are many problems such as low tap density and low working voltag...

Claims

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Application Information

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IPC IPC(8): H01M4/58H01M10/0525
CPCH01M4/5825H01M10/0525Y02E60/10
Inventor 常程康陈雪平丰平陈杰郭倩郭芸芸
Owner SHANGHAI INSTITUTE OF TECHNOLOGY
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