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Anode active material for lithium ion secondary battery and its making method

A cathode active material, secondary battery technology, applied in electrode manufacturing, battery electrodes, chemical instruments and methods, etc., can solve the problems of high price, specific capacity and cycle life can not meet the requirements, etc., to reduce production costs, good electricity Effects of chemical properties

Inactive Publication Date: 2008-09-10
TIANJIN B&M SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The research is relatively mature, and the comprehensive performance is excellent, but due to the scarcity of cobalt resources, this type of cathode material is expensive
[0004] Another study used lithium copper (II) oxide (Li 2 CuO 2 ) and lithium copper (III) oxide (LiCuO 2 ) as cathode materials, but they cannot meet the requirements in terms of specific capacity and cycle life

Method used

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  • Anode active material for lithium ion secondary battery and its making method

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Effect test

Embodiment 1

[0020] 10.8kg bile alum (CuSO 4 ·5H 2 O) and 1.8kg nickel sulfate (NiSO 4 ·6H 2 O) dissolved in 25L deionized water to form a mixed solution. In addition, 4.8kg caustic soda (NaOH) and 3L industrial ammonia (NH 3 ·H 2 O) be dissolved in 15L deionized water, and then at 55°C, slowly drop the prepared above-mentioned mixed solution into the reaction vessel under stirring at the same time, and control the pH value to 11.2, and react for 12 hours to obtain the particle size (D 50 ) is 4.5 kg of co-precipitated precursor particles of copper-nickel hydroxide of 15.3 μm.

[0021] The prepared precursor particles were mixed with 0.8kg lithium oxide (Li 2 O) After fully mixing, bake at a temperature of 600°C for 16 hours to obtain copper (II) nickel (II) acid lithium (Li 2 Cu 0.86 Ni 0.14 o 2 )solid. Break the solid into powder and put it into 10L of liquid bromine-acetonitrile solution with a concentration of 2.5% by volume, wash and dry it after oxidation for 5 hours to ob...

Embodiment 2

[0023] 6.2kg bile alum (CuSO 4 ·5H 2 O) and 6.6kg nickel sulfate (NiSO 4 ·6H 2 O) dissolved in 25L deionized water to form a mixed solution. Another 4.8kg caustic soda (NaOH) and 3L ammonia water (NH 3 ·H 2 O) Dissolve in 15 L deionized water. Then at 50°C, the above-mentioned mixed solution prepared was slowly added dropwise to the reaction vessel under stirring at the same time, and the pH value was controlled to be 12.0, and the reaction was carried out for 14 hours to obtain a particle size (D 50 ) is 4.4 kg of co-precipitated precursor particles of copper-nickel hydroxide with a diameter of 17.4 μm.

[0024] The precursor particles were mixed with 0.8kg lithium oxide (Li 2 O) After fully mixing, bake at a temperature of 800°C for 24 hours to obtain copper (II) nickel (II) lithium (Li) 2 Cu 0.86 Ni 0.14 o 2 )solid. Break the solid into powder and put it into 10L of liquid bromine-acetonitrile solution with a concentration of 4.0% by volume, wash and dry it afte...

Embodiment 3

[0026] 10kg bile alum (CuSO 4 ·5H 2 O) and 15.8kg nickel sulfate (NiSO 4 ·6H 2 O) dissolved in 25L deionized water to form a mixed solution. In addition, 4.8kg caustic soda (NaOH) and 3L industrial ammonia (NH 3 ·H 2 O) be dissolved in 15L deionized water, and then at 52°C, slowly drop the prepared above-mentioned mixed solution into the reaction vessel under stirring at the same time, and control the pH value to 11.0, and react for 13.5 hours to obtain the particle size (D 50 ) is 7.5 kg of co-precipitated precursor particles of copper nickel hydroxide of 11.4 μm.

[0027] The prepared precursor particles were mixed with 5.6kg lithium nitrate (LiNO 3 ) were fully mixed and baked at a temperature of 700° C. for 16 hours to obtain copper (II) nickel (II) acid lithium (Li 2 Cu 0.86 Ni 0.14 o 2 )solid. Break the solid into powder and put it into 10L of liquid bromine-acetonitrile solution with a concentration of 2.5% by volume, wash and dry it after oxidation for 5 hou...

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Abstract

The invention discloses a preparation method of an active substance for positive electrode of secondary lithium ion batteries which comprises the steps of preparing coprecipitation precursor particles of copper nickel hydroxide, preparing a solid of lithium copper (II)-nickel (II) acid and black solid power of copper(III)-nickel (III)acid. The preparation method adopts nickel sulfate and copper sulfate with low cost as raw materials, thereby reducing production cost of secondary battery of lithium ion; compared with the batteries made from the existing commercial electrode materials of lithium cobalt oxide, the batteries produced by the preparation method of an active substance for positive electrode of secondary lithium ion batteries has better electrochemical capacity and cycle performance; compared with the secondary batteries of lithium ion made from positive active materials such as lithium copper (II) acid / lithium copper (III) acid, the positive electrode active substance applied to secondary batteries of lithium ion of the invention has better electrochemical properties.

Description

technical field [0001] The invention relates to a lithium ion secondary battery, in particular to a positive electrode active material for a lithium ion secondary battery and a preparation method thereof. Background technique [0002] Lithium-ion battery is a new generation of green high-energy secondary battery. It has many advantages such as high voltage, high energy density, good cycle performance, small self-discharge, no memory effect, and wide operating temperature range. It is widely used in mobile phones, notebook computers, UPS, camcorders, various portable electric tools, electronic instruments, weapons and equipment, etc. also have good application prospects in electric vehicles, and are regarded as high-tech products that are of great significance to the national economy and people's lives in the 21st century. [0003] Cathode materials are an important part of lithium-ion batteries. Lithium cobalt oxide (LiCoO 2 ), usually prepared by high-temperature solid-ph...

Claims

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Application Information

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IPC IPC(8): H01M4/48H01M4/58H01M4/04C01D15/00C01G1/02C01G53/00B01J19/00
CPCY02E60/10
Inventor 刘勇陈勃涛张宁郭建吴孟涛
Owner TIANJIN B&M SCI & TECH
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