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Method for producing high performance lithium ion battery anode material LiFePO4/C

A technology for lithium ion batteries and cathode materials, applied in electrode manufacturing, battery electrodes, chemical instruments and methods, etc., can solve the problems of poor performance and high cost of lithium iron phosphate, improve uniformity and conductivity, and facilitate the reaction process. Control and prevent the effect of agglomeration

Inactive Publication Date: 2008-05-14
江苏君明高新科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to overcome the shortcomings of high cost and poor performance of lithium iron phosphate, the positive electrode material of lithium ion batteries in the prior art, to provide a material with low cost and energy consumption, and the prepared positive electrode material has high charge and discharge capacity and good cycle performance. Good lithium ion battery cathode material LiFePO 4 Preparation method of / C

Method used

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  • Method for producing high performance lithium ion battery anode material LiFePO4/C
  • Method for producing high performance lithium ion battery anode material LiFePO4/C
  • Method for producing high performance lithium ion battery anode material LiFePO4/C

Examples

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Embodiment 1

[0043] Example 1: LiFePO, the cathode material for lithium-ion batteries 4 Preparation method of / C

[0044] (1) LiOH·H 2 O, Fe(NO 3 ) 3 9H 2 O, H 3 PO 4 1. Ascorbic acid was weighed in a molar ratio of 1:1.2:1.0:0.6, and deionized water was added thereto to form a solution with a concentration of 1.0 mol / L. Fe(NO 3 ) 3 9H 2 O solution, LiOH·H 2 The O solution was added to the ascorbic acid solution, followed by H 3 PO 4 solution, fully stirred and mixed evenly, and aged for 13 hours;

[0045] (2) drying for 12 hours at a temperature of 70°C and a vacuum of less than 10 Pa to obtain a xerogel, and grinding the xerogel into a fine powder to obtain a precursor;

[0046] (3) Add 8.0% nano-carbon black to the precursor, grind it in a ball mill for 15 minutes, then place it in an alumina crucible, and microwave heat treatment at a temperature of 720 ° C for 20 minutes under the protection of an argon atmosphere to obtain LiFePO 4 / C.

Embodiment 2

[0047] Example 2: LiFePO 4 Preparation method of / C

[0048] (1) LiOH·H 2 O, Fe(NO 3 ) 3 9H 2 O, H 3 PO 4 1. Ascorbic acid is weighed according to the molar ratio of 1:1:1:0.5, and distilled water is added to form a solution, and the solution concentration is 1.5mol / L. Fe(NO 3 ) 3 9H 2 O solution, LiOH·H 2 The O solution was added to the ascorbic acid solution, followed by H 3 PO 4 solution, fully stirred and mixed evenly, aged for 12 hours;

[0049] (2) Under the protection of an argon atmosphere, the temperature is 70 ° C and dried for 10 hours to obtain a xerogel, which is ground into a fine powder to obtain a precursor;

[0050] (3) Add 5.0% nano-acetylene black to the precursor, grind it in a ball mill for 15 minutes, then place it in an alumina crucible, and microwave heat treatment at a temperature of 700 ° C for 15 minutes under the protection of an argon atmosphere to obtain LiFePO 4 / C.

Embodiment 3

[0051] Example three: LiFePO 4 Preparation method of / C

[0052] (1) LiOH·H 2 O, Fe(NO 3 ) 3 9H 2 O, H 3 PO 4 1. Ascorbic acid was weighed in a molar ratio of 1:1.2:1:0.3, and deionized water was added to form a solution, and the solution concentration was 3.0 mol / L. Fe(NO 3 ) 3 9H 2 O solution, LiOH·H 2 The O solution was added to the ascorbic acid solution, followed by H 3 PO 4 solution, fully stirred and mixed evenly, and aged for 10 hours;

[0053] (2) Under the conditions of vacuum degree of 7 Pa and temperature of 60°C, dry for 12 hours to obtain xerogel, and grind the xerogel into fine powder to obtain the precursor;

[0054] (3) Add 2.0% nano-graphite to the precursor, grind it in a ball mill for 12 minutes, then place it in an alumina crucible, and heat it with microwave at 650°C for 25 minutes under the protection of nitrogen atmosphere to obtain LiFePO 4 / C.

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Abstract

The invention relates to a preparation method for making lithium ion battery cathode materials of LiFePO4 / C by using the reducing agent and inorganic salts of iron source, phosphorus source, lithium source, carbon source and so on as raw materials. Adopt the combining method of sol-gel and microwave treatment and prepare ultrafine particles of LiFePO4 and carbon coat the particles at the same time. On this basis, change the property of LiFePO4 / C by metal doping of Cr3 plus , Co3 plus . By processing with industrial microwave oven of high power, the invention shortens processing time greatly, increases the yield remarkably, reduces material cost and energy loss, simplifies the processes, improves the efficiency of industrial production of lithium ion battery and is convenient for implementation in industry. Take it as cathode materials of lithium ion battery with high-rate discharge. The invention raises conductivity of lithium iron phosphate and at the same time improves charge discharge capacity and cycle numbers by carbon coating and metal element doping.

Description

1. Technical field: [0001] The invention relates to a preparation method of a positive electrode active material of a lithium ion battery, in particular to a high-performance lithium ion battery positive electrode material LiFePO 4 / C preparation method. 2. Background technology: [0002] Lithium-ion batteries have the advantages of high discharge rate, wide operating temperature range, excellent cycle performance, good safety, environmental protection and no pollution. Since their inception, they have been widely used in portable electronic devices such as mobile phones, laptop computers, and small cameras. As a new generation of energy materials, lithium-ion batteries will also be widely used in electric vehicles, satellites, aerospace and military fields. Cathode materials are an important part of lithium-ion batteries, and the research and development of high-performance cathode materials has become the key to the development of lithium-ion batteries. A series of studi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/04H01M4/58C01B25/45
CPCY02E60/12Y02E60/10
Inventor 刘新保贾晓林马美品刘宇飞周永刚吴江峰
Owner 江苏君明高新科技有限公司
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