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Non-aqueous electrolyte secondary battery positive electrode active material and method for manufacturing same, and non-aqueous electrolyte secondary battery

A technology of positive electrode active material and non-aqueous electrolyte, applied in the field of non-aqueous electrolyte secondary battery, can solve the problems of high reliability evaluation of crystallinity and peak position shift of difficult positive electrode active material

Active Publication Date: 2016-03-30
SUMITOMO METAL MINING CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] However, the position of the diffraction peak shifts due to changes in crystallinity and composition, so evaluation based on the full width at half maximum (FWHM) is a last resort relative evaluation, and it is difficult to evaluate the crystallinity of the positive electrode active material with high reliability

Method used

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  • Non-aqueous electrolyte secondary battery positive electrode active material and method for manufacturing same, and non-aqueous electrolyte secondary battery
  • Non-aqueous electrolyte secondary battery positive electrode active material and method for manufacturing same, and non-aqueous electrolyte secondary battery
  • Non-aqueous electrolyte secondary battery positive electrode active material and method for manufacturing same, and non-aqueous electrolyte secondary battery

Examples

Experimental program
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Effect test

Embodiment 1

[0168] [Crystalization process]

[0169] First, water was added into the reaction tank (600 L), the temperature in the tank was adjusted to 40° C. while stirring, and nitrogen gas was circulated to form a nitrogen atmosphere. By adding an appropriate amount of 25% by mass of sodium hydroxide aqueous solution and 25% by mass of ammonia water in the water in the reaction tank, the pH value of the reaction solution in the reaction tank is adjusted to 12.6 based on the liquid temperature of 25 ° C, as the aqueous solution before the reaction .

[0170] Next, various powders of nickel sulfate, cobalt sulfate, manganese sulfate, zirconium sulfate, and sodium tungstate were dissolved in water and adjusted to a mixed aqueous solution of 2 mol / L. This mixed aqueous solution was adjusted so that the molar ratio of each metal element might become Ni:Co:Mn=0.33:0.33:0.33 and (Ni+Co+Mn):Zr:W=0.993:0.002:0.005.

[0171] This mixed aqueous solution was added to the pre-reaction aqueous sol...

Embodiment 2

[0194] In addition to mixing with lithium carbonate in the manner of Li / Me=1.16 in the mixing process and setting the firing temperature to 898°C and t in the firing process 1 is 2.9 hours, t 2 1.1 hours, t 3 Except for 4.5 hours, it carried out similarly to Example 1, the positive electrode active material was obtained, and it evaluated.

Embodiment 3

[0196] In addition to setting the firing temperature at 898°C and t in the firing process 1 is 1.8 hours, t 2 is 0.7 hours, t 3 Except for 4.0 hours, it carried out similarly to Example 1, and obtained and evaluated the positive electrode active material.

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Abstract

To provide, using an industrial manufacturing method, a non-aqueous electrolyte secondary battery positive electrode active material capable of improving output characteristics under low-temperature environment use. A lithium mixture consisting of complex hydroxide particles and a lithium compound is calcined in an oxidizing atmosphere under the condition that temperature rising time from 650 DEG C to a calcination temperature is set to 0.5 to 1.5 hours and the calcination temperature is set to 850 to 1000 DEG C and maintained for 1.0 to 5.0 hours. This obtains a positive electrode active material expressed by the general formula (A): Li1+sNixCoyMnzMtO2, where -0.05 <= s <= 0.20, x + y + z + t = 1, 0.3 <= x <= 0.7, 0.1 <= y <= 0.4, 0.1 <= z <= 0.4, 0 <= t <= 0.05, and M is one or more types of elements selected from Ca, Mg, Al, Ti, V, Cr, Zr, Nb, Mo, Hf, Ta, and W. The positive electrode active material consists of hexagonal lithium complex oxide particles having a layered structure composed of secondary particles in which primary particles are aggregated and has the ratio of a (104) crystalline diameter to a (003) crystalline diameter exceeding 0 and less than 0.60.

Description

technical field [0001] The present invention relates to a positive electrode active material for a nonaqueous electrolyte secondary battery, a method for producing the same, and a nonaqueous electrolyte secondary battery using the positive electrode active material as a positive electrode material. Background technique [0002] In recent years, with the popularization of portable devices such as mobile phones and notebook computers, the development of small and lightweight secondary batteries with high energy density has been eagerly expected. In addition, the development of a high-output secondary battery as a power source for driving a motor, especially a battery for a transmission device, is also being eagerly expected. [0003] As a secondary battery satisfying such a requirement, there is a lithium ion secondary battery which is a type of nonaqueous electrolyte secondary battery. This lithium ion secondary battery is composed of a negative electrode, a positive electro...

Claims

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Application Information

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IPC IPC(8): H01M4/525C01G53/00H01M4/505
CPCC01G53/50H01M4/525C01P2002/50C01P2004/51C01P2004/64C01P2006/12H01M4/505H01M10/0525H01M2004/028Y02E60/10H01M4/366
Inventor 小田周平户屋广将井之上胜哉
Owner SUMITOMO METAL MINING CO LTD
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