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Aluminum-coated nickel-cobalt-containing composite hydroxide and production method, non-aqueous electrolyte secondary battery, positive electrode active material and production method

A technology of composite hydroxide and positive active material, applied in non-aqueous electrolyte batteries, secondary batteries, nickel compounds, etc., can solve the problems of not considering improving cycle characteristics and high temperature storage, and achieve improved cycle characteristics and high temperature storage. performance, improved battery characteristics, and the effect of large industrial significance

Active Publication Date: 2020-03-24
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 positive electrode active material described in this document is mainly aimed at improving the output characteristics in a low-temperature environment, so it does not consider improving cycle characteristics and high-temperature storage properties at all.

Method used

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  • Aluminum-coated nickel-cobalt-containing composite hydroxide and production method, non-aqueous electrolyte secondary battery, positive electrode active material and production method
  • Aluminum-coated nickel-cobalt-containing composite hydroxide and production method, non-aqueous electrolyte secondary battery, positive electrode active material and production method
  • Aluminum-coated nickel-cobalt-containing composite hydroxide and production method, non-aqueous electrolyte secondary battery, positive electrode active material and production method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0188] a) Fabrication 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 247 L of a raw material aqueous solution having a nickel concentration of 1.65 mol / L, a cobalt concentration of 0.31 mol / L, and a magnesium concentration of 0.02 mol / L. Simultaneously, a reaction aqueous solution was prepared by supplying 140 L of pure water, 6 L of 25 mass % aqueous sodium hydroxide solution and 6 L of 25 mass % ammonia water to the reaction tank.

[0191] The temperature of the reaction aqueous solution was set at 50°C, and nitrogen gas was blown from above to block the reaction aqueous solution from contact with oxygen. In this state, while stirring the reactio...

Embodiment 2

[0224] In the crystallization process, except that the magnesium concentration of the raw material aqueous solution was made 0.06 mol / L, an Al-coated composite hydroxide, a positive electrode active material, and a secondary battery were obtained in the same manner as in Example 1, and were tested. evaluate. The results are shown in Tables 2 to 4. In addition, about the following Examples 3-9 and the comparative example 7, the evaluation result is shown to Table 2-Table 4 similarly.

Embodiment 3

[0226] In the crystallization process, the pH value of the reaction aqueous solution was adjusted to 10.8 based on the liquid temperature of 25° C., except that it was performed in the same manner as in Example 1 to obtain an Al-coated composite hydroxide, a positive electrode active material, and secondary battery, and its evaluation was carried out.

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Abstract

The object of the present invention is to provide a positive electrode active material for a non-aqueous electrolyte secondary battery with improved cycle characteristics and high-temperature storage properties without loss of charge-discharge capacity and output characteristics. The solution of the present invention is as follows: in an inert environment, the temperature is controlled to be 45°C to 55°C, the pH value based on the liquid temperature of 25°C is controlled to be 10.8 to 11.8, and the concentration of ammonium ions is controlled to be 8g / A raw material aqueous solution containing Ni, Co and Mg is supplied to a reaction aqueous solution of L to 12 g / L, and a nickel-cobalt-containing composite hydroxide is obtained by a batch crystallization method. By mixing the slurry containing the composite hydroxide and the coating solution containing Al to form a mixed aqueous solution, the secondary particles of the composite hydroxide are coated with a coating made of Al or an Al compound, Obtained by the general formula Ni 1‑x‑y‑ z co x Al y Mg z (OH) 2 (wherein, 0.05≤x≤0.20, 0.01≤y≤0.06, 0.01≤z≤0.03) represents an Al-coated composite hydroxide. Using this Al-coated composite hydroxide as a precursor, a positive electrode active material having a structure in which constituent elements of Al are homogeneously dispersed in secondary particles is synthesized.

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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Patent Type & Authority Patents(China)
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