Active material for nonaqueous electrolyte secondary battery, method for production of the active material, electrode for nonaqueous electrolyte secondary battery and nonaqueous electrolyte secondary battery

A non-aqueous electrolyte and secondary battery technology, which is applied in the direction of non-aqueous electrolyte storage batteries, battery electrodes, secondary batteries, etc., can solve problems such as lithium composite oxide particles that are not specifically recorded, and achieve high-rate discharge characteristics and excellent output characteristics Effect

Active Publication Date: 2013-09-11
GS YUASA INT LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

)” (claim 1), but the invention “aims to provide a positive electrode active material, a positive electrode for a nonaqueous electrolyte battery, and a nonaqueous electrolyte battery that contribute to both high capacity and suppression of gas generation” (paragraph [0013 ]), it is not intended to improve the high-rate discharge characteristics, and there is no specific description that the lithium composite oxide particles contain Mn

Method used

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  • Active material for nonaqueous electrolyte secondary battery, method for production of the active material, electrode for nonaqueous electrolyte secondary battery and nonaqueous electrolyte secondary battery
  • Active material for nonaqueous electrolyte secondary battery, method for production of the active material, electrode for nonaqueous electrolyte secondary battery and nonaqueous electrolyte secondary battery
  • Active material for nonaqueous electrolyte secondary battery, method for production of the active material, electrode for nonaqueous electrolyte secondary battery and nonaqueous electrolyte secondary battery

Examples

Experimental program
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Effect test

Embodiment 1

[0050] In Example 1, in order to make the Co concentration of the coating part higher than the Co concentration of the core, it is preferable to use a precursor particle of a transition metal compound coated with a compound containing Co or a precursor of a transition metal compound coated with a compound containing Co and Ni. Particles, or precursor particles of a transition metal compound coated with a compound containing Co, Ni, and Mn and containing more Co than Mn in terms of molar ratio.

[0051]In addition, in order to improve the cycle characteristics of high-rate discharge, it is preferable to use lithium transition metal composite oxide particles in which the Co concentration in one particle continuously changes. Therefore, in Example 2, when the surface position of the particle is represented as 0 and the center position is represented as 1, the starting point of the cobalt concentration gradient region from the particle surface exists at 0.1-0.5. The core is a regi...

Embodiment 2

[0059] In Example 2, in order to improve the output characteristics while improving the high-rate discharge characteristics, it is preferable that the average particle diameter of the lithium transition metal composite oxide particles be 8 μm or less. As shown in Examples described below, in the precursor production process, by setting the stirring duration after the dropwise addition of the raw material aqueous solution to less than 5 hours, the average particle size can be set to 8 μm or less. When the average particle diameter exceeds 8 μm, the initial high-rate discharge capacity of a nonaqueous electrolyte secondary battery using the same becomes small, but the cycle characteristics of high-rate discharge are excellent.

[0060] Next, a method for producing the active material for a nonaqueous electrolyte secondary battery of the present invention will be described.

[0061] The manufacturing method of the active material for non-aqueous electrolyte secondary battery of e...

Embodiment 1-1

[0111] [Precursor core particle manufacturing process]

[0112] Cobalt sulfate 7 hydrate, nickel sulfate 6 hydrate, and manganese sulfate 5 hydrate were dissolved in 200 ml of ion-exchanged water to produce a 2.00 mol / l sulfate solution with a molar ratio of Co: Ni: Mn of 12.5: 19.94: 67.56 .

[0113] By injecting 750ml of ion exchanged water into a 2L reaction tank, the CO 2 Gas was bubbled for 30 min, so that the CO 2 Dissolved in ion-exchanged water. The temperature of the reaction tank was set at 50° C. (±2° C.), and the reaction tank was stirred at a rotation speed of 700 rpm using a paddle blade equipped with a stirring motor, and the sulfate solution was added dropwise at a rate of 3 ml / min. Among them, from the beginning to the end of the dropping, the aqueous solution containing 2.00 mol / l sodium carbonate solution and 0.4 mol / l ammonia solution is appropriately dropped, so as to control the pH in the reaction tank to maintain 7.9 (± 0.05) for a long time . After...

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Abstract

The invention provides an active material for a nonaqueous electrolyte secondary battery, a method for production of the active material and the nonaqueous electrolyte secondary battery using the active material, the active material excellent high-rate discharge characteristics. The active material for a nonaqueous electrolyte secondary battery includes a lithium-transition metal composite oxide which has an alpha-NaFeO2 -type crystal structure and of which the average composition is represented by the composition formula of Li1+[alpha]Me1-[alpha]O2 (Me is a transition metal containing Co, Ni and Mn; and alpha > 0), wherein the lithium-transition metal composite oxide is a particle having a core and a coated part, the cobalt concentration of the coated part is higher than the cobalt concentration of the core, the manganese concentration of the coated part is lower than the manganese concentration of the core, and the ratio of cobalt present in the coated part is 3 to 10% in terms of a molar ratio based on the amount of the transition metal present in the core. In addition, the method for production of the active material of the nonaqueous electrolyte secondary battery is characterized by enabling cobalt-containing compounds, cobalt-nickel-containing compounds and cobalt-nickel-manganese-containing compounds with more cobalt than manganese in a molar ratio to coat co-precipitated precursor core particles of transition metal compounds containing cobalt, nickel and manganese and being with more manganese than cobalt in the molar ratio, mixing the co-precipitated precursor core particles and lithium compounds, and then firing.

Description

technical field [0001] The present invention relates to an active material for a nonaqueous electrolyte secondary battery, a method for producing the active material, and a nonaqueous electrolyte secondary battery using the active material. Background technique [0002] So far, non-aqueous electrolyte secondary batteries mainly use LiCoO 2 as a positive electrode active material. However, the discharge capacity is around 120-130mAh / g. [0003] As a positive electrode active material material for non-aqueous electrolyte secondary batteries, LiCoO is known 2 and solid solutions of other compounds. With α-NaFeO 2 type crystal structure, LiCoO 2 , LiNiO 2 and LiMnO 2 The Li[Co 1-2x Ni x mn x ]O 2 (0<x≤1 / 2) was published in 2001. As an example of the aforementioned solid solution, LiNi 1 / 2 mn 1 / 2 o 2 、LiCo 1 / 3 Ni 1 / 3 mn 1 / 3 o 2 It has a discharge capacity of 150 to 180 mAh / g, and is excellent in charge and discharge cycle performance. [0004] Compared with...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/505H01M4/525H01M10/05H01M10/0525
CPCC01G53/003C01G53/50H01M4/366H01M4/505H01M4/525H01M10/052C01G51/04C01P2002/70C01P2002/76C01P2004/61C01P2004/84C01P2006/11Y02E60/10H01M10/05H01M4/131
Inventor 远藤大辅
Owner GS YUASA INT LTD
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