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Aluminum-coated nickel cobalt-containing composite hydroxide and method for manufacturing same, cathode active material for nonaqueous electrolyte secondary battery and method for manufacturing same, and nonaqueous electrolyte secondary battery

A composite hydroxide and positive electrode active material technology, which is applied in the direction of non-aqueous electrolyte batteries, secondary batteries, nickel compounds, etc., can solve the problems of not considering the improvement of cycle characteristics and high-temperature storage, and achieve the improvement of cycle characteristics and high-temperature storage performance, improvement of battery characteristics, and large-scale industrial effects

Active Publication Date: 2018-01-02
SUMITOMO METAL MINING CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] However, the cathode active material described in this document is mainly aimed at improving the output characteristics in a

Method used

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  • Aluminum-coated nickel cobalt-containing composite hydroxide and method for manufacturing same, cathode active material for nonaqueous electrolyte secondary battery and method for manufacturing same, and nonaqueous electrolyte secondary battery
  • Aluminum-coated nickel cobalt-containing composite hydroxide and method for manufacturing same, cathode active material for nonaqueous electrolyte secondary battery and method for manufacturing same, and nonaqueous electrolyte secondary battery
  • Aluminum-coated nickel cobalt-containing composite hydroxide and method for manufacturing same, cathode active material for nonaqueous electrolyte secondary battery and method for manufacturing same, and nonaqueous electrolyte secondary battery

Examples

Experimental program
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Example Embodiment

[0187] (Example 1)

[0188] a) Production of Al-coated composite hydroxide

[0189] After the nickel-cobalt-containing composite hydroxide was crystallized by a batch crystallization method, the secondary particles of the composite hydroxide were coated with aluminum to produce an Al-coated composite hydroxide.

[0190] First, nickel sulfate, cobalt sulfate, and magnesium sulfate were dissolved in pure water to prepare 247L of a raw material aqueous solution with a nickel concentration of 1.65 mоl / L, a cobalt concentration of 0.31 mоl / L, and a magnesium concentration of 0.02 mоl / L. At the same time, by supplying 140 L of pure water, 6 L of 25 mass% sodium hydroxide aqueous solution, and 6 L of 25 mass% ammonia water to the reaction tank, a reaction aqueous solution was prepared.

[0191] The temperature of this reaction aqueous solution was set to 50 degreeC, and the contact of the reaction aqueous solution and oxygen was blocked by blowing nitrogen gas upwards. In this state, while ...

Example Embodiment

[0223] (Example 2)

[0224] In the crystallization step, except that the magnesium concentration of the raw material aqueous solution was set to 0.06 mоl / L, in the same manner as in Example 1, Al-coated composite hydroxides, positive electrode active materials, and secondary batteries were obtained and tested. Evaluation. The results are shown in Table 2 to Table 4. In addition, for the following Examples 3-9 and Comparative Example 7, the evaluation results are also shown in Tables 2 to 4 in the same manner.

Example Embodiment

[0225] (Example 3)

[0226] In the crystallization step, the pH of the reaction aqueous solution was adjusted to 10.8 based on the liquid temperature of 25°C, except that the same procedure as in Example 1 was carried out to obtain Al-coated composite hydroxide, positive electrode active material, and Secondary battery and evaluated it.

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Abstract

[Problem] To provide a cathode active material for nonaqueous electrolyte secondary batteries in which cycle properties and high temperature storage performance are improved without inhibiting charge/discharge capacities or output properties. [Solution] In an inert atmosphere, an aqueous feedstock solution containing Ni, Co, and Mg is supplied to an aqueous reaction solution that is controlled toa temperature of 45C to 55C, a pH value based on a liquid temperature of 25C of 10.8 to 11.8, and an ammonium ion concentration of 8 g/L to 12 g/L to obtain a nickel cobalt-containing composite hydroxide by a batch crystallization method. A slurry containing this composite hydroxide is mixed with a coating solution containing Al to form a mixed aqueous solution so that secondary particles of thiscomposite hydroxide are coated with a coating comprising Al or an Al compound and an Al-coated composite hydroxide represented by the general formula: Ni1-x-y-zCoxAlyMgz(OH)2 (provided that 0.05<=x<=0.20, 0.01<=y<=0.06, 0.01<=z<=0.03) is obtained. With this Al-coated composite hydroxide as a precursor, a cathode active material is synthesized having a structure in which constituent elements containing Al are uniformly dispersed in the secondary particles.

Description

technical field [0001] The present invention relates to an aluminum-coated nickel-cobalt-containing composite hydroxide and a production method thereof, and a positive electrode active material for a non-aqueous electrolyte secondary battery using the aluminum-coated nickel-cobalt-containing composite hydroxide as a precursor and a production method thereof , and a non-aqueous electrolyte secondary battery. Background technique [0002] In recent years, with the popularization of portable electronic devices such as mobile phones and notebook computers, there has been a strong demand for the development of small and lightweight secondary batteries with high energy density. In addition, there is a strong need to develop a high-output secondary battery as a power source for driving a motor, especially as a power source for transportation equipment. Lithium ion secondary batteries, which are nonaqueous electrolyte secondary batteries, are secondary batteries that can satisfy th...

Claims

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Application Information

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IPC IPC(8): C01G53/00H01M4/505H01M4/525
CPCC01G53/006C01G53/42C01P2004/03C01P2004/39C01P2004/50C01P2004/61C01P2004/62C01P2004/64C01P2004/80C01P2006/11C01P2006/12H01M4/131H01M4/366H01M4/485H01M4/525H01M10/052Y02E60/10C01G53/44H01M4/505H01M10/0525
Inventor 本间刚秀山地浩司牛尾亮三
Owner SUMITOMO METAL MINING CO LTD
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