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Positive electrode active material for non-aqueous electrolyte secondary battery and process for production thereof, and non-aqueous electrolyte secondary battery produced using the positive electrode active material

A positive active material, non-aqueous electrolyte technology, applied in battery electrodes, chemical instruments and methods, circuits, etc., can solve problems such as lithium-ion secondary batteries that have not yet been obtained, and achieve high safety and durability, high safety, The effect of maintaining safety

Active Publication Date: 2012-12-26
SUMITOMO METAL MINING CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the current situation is that a lithium-ion secondary battery having high charge and discharge capacity and high safety and durability has not yet been obtained.

Method used

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  • Positive electrode active material for non-aqueous electrolyte secondary battery and process for production thereof, and non-aqueous electrolyte secondary battery produced using the positive electrode active material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1）

[0104] A mixed aqueous solution having a concentration of 1.8 mol / L was dissolved in water such that nickel sulfate and cobalt sulfate were dissolved in water at a molar ratio of Ni:Co=0.83:0.17 by using a reaction tank for continuous crystallization having an overflow piping in the upper part. , and 25% sodium hydroxide aqueous solution and 25% ammonia water as neutralizer, so that the liquid temperature is 40°C, and the pH of the solution is maintained at a fixed value of 12.0 as the pH value measured based on the liquid temperature of 25°C. While setting the method, it was continuously fed into the reaction tank at a constant flow rate, and the overflowed slurry was continuously recovered, and crystallization was carried out based on the above-mentioned method. By setting the average residence time in the tank to 20 hours, the continuous tank was brought into an equilibrium state, and then slurry recovery and solid-liquid separation were performed to obtain a crystallized pr...

Embodiment 2）

[0120] A positive electrode active material was obtained in the same manner as in Example 1, except that the content of aluminum added to the fine secondary particles was set to 0.098 in terms of molar ratio. The composition of the obtained positive electrode active material is Li 1.06 Ni 0.808 Co 0.151 Al 0.041 O 2 . In addition, the average particle diameter and particle size range of the fine secondary particles, the average particle diameter and particle size range of the coarse secondary particles, and the overall average particle diameter of the obtained positive electrode active material were 2.62 μm and 1.0 to 5.0 μm, respectively. , 8.42 μm, 3.0 to 11.0 μm, and 8.32 μm, and the aluminum concentration ratio (SA / LA) of fine secondary particles to coarse secondary particles was 2.51. In the same manner as in Example 1, the discharge capacity retention rate was measured to be 92%.

Embodiment 3）

[0122] A positive electrode active material was obtained in the same manner as in Example 1, except that the content of aluminum added to the fine secondary particles was set to 0.047 in terms of molar ratio. The composition of the obtained positive electrode active material is Li 1.06 Ni 0.81 Co 0.151 Al 0.039 O 2 . In addition, the average particle diameter and particle size range of the fine secondary particles, the average particle diameter and particle size range of the coarse secondary particles, and the overall average particle diameter of the obtained positive electrode active material were 2.51 μm and 1.0 to 5.0 μm, respectively. , 8.43 μm, 3.0 to 11.0 μm, 8.37 μm, and the aluminum concentration ratio (SA / LA) of the fine secondary particles to the coarse secondary particles was 1.21. In the same manner as in Example 1, the discharge capacity retention rate was measured to be 88%.

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Abstract

Disclosed is a non-aqueous electrolyte secondary battery which can exhibit two properties, i.e., high safety and high durability, at the same time while retaining a high charge / discharge capacity. Specifically disclosed is a positive electrode active material for a non-aqueous electrolyte secondary battery, which comprises secondary particles composed of fine secondary particles and coarse secondary particles and has an average particle diameter of 5 to 15 [mu]m, wherein the fine secondary particles comprise a lithium-nickel composite oxide having at least two metal elements including aluminum added thereto and have an average particle diameter of 2 to 4 [mu]m and the coarse secondary particles have an average particle diameter of 6 to 15 [mu]m, and wherein the aluminum content (metal molar ratio: SA) in the fine secondary particles is higher than the aluminum content (metal molar ratio: LA) in the coarse secondary particles and the aluminum concentration ratio (SA:LA) is preferably 1.2 to 2.6.

Description

technical field [0001] The present invention relates to a non-aqueous electrolyte secondary battery and a positive electrode active material used as a positive electrode material thereof, in particular to a positive electrode active material composed of a lithium-nickel composite oxide. Background technique [0002] Lithium-ion secondary batteries, which are non-aqueous electrolyte secondary batteries, are small and high in capacity, and can therefore be mounted as power sources for small mobile devices such as cellular phones, video cameras, and portable information terminals (personal digital assistants) (PDAs). Furthermore, the research and development of large-scale lithium-ion secondary batteries is also advancing with the goal of being mounted on automobiles represented by hybrid vehicles. From the above background, lithium-ion secondary batteries are required to have higher capacity and output characteristics. In particular, lithium-ion secondary batteries for automob...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/525C01G53/00H01M4/131H01M4/36
CPCH01M4/505Y02E60/122C01G53/42H01M4/525H01M4/131C01P2006/40C01P2004/53H01M4/139H01M4/485C01G53/006C01P2004/61H01B1/08Y02E60/10C01G53/00H01M4/36
Inventor 小田周平户屋广将加濑克也小山裕
Owner SUMITOMO METAL MINING CO LTD
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