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Positive electrode material, method of production therefor, positive electrode for nonaqueous rechargeable battery, and nonaqueous rechargeable battery

A technology for non-aqueous secondary batteries and positive electrode materials, applied in secondary batteries, electrode manufacturing, battery electrodes, etc., can solve problems such as large changes in effect, and achieve the effect of less change over time, excellent productivity, and suppression of capacity decline

Inactive Publication Date: 2012-11-07
HITACHI MAXELL ENERGY LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, according to the studies of the inventors of the present invention, it has been found that the effect varies greatly depending on the physical properties of the lithium-containing composite oxide during treatment.

Method used

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  • Positive electrode material, method of production therefor, positive electrode for nonaqueous rechargeable battery, and nonaqueous rechargeable battery
  • Positive electrode material, method of production therefor, positive electrode for nonaqueous rechargeable battery, and nonaqueous rechargeable battery
  • Positive electrode material, method of production therefor, positive electrode for nonaqueous rechargeable battery, and nonaqueous rechargeable battery

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Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0032] The positive electrode material according to Embodiment 1 of the present invention contains at least a lithium nickel composite oxide represented by the following general composition formula (1) as a positive electrode active material.

[0033] Li 1＋x MO 2 …(1)

[0034] Wherein, -0.5≤x≤0.5, and M represents an element group containing at least one element of Mn and Co and two or more elements of Ni, and in each element constituting M, the ratio of Ni, Mn and Co (mol %) are respectively set as a, b and c, 20≤a<100, 50≤a+b+c≤100.

[0035] The lithium-nickel composite oxide represented by the general composition formula (1) contains an element group M including at least one element selected from Mn and Co and Ni. Among them, Ni is a component that contributes to the improvement of the capacity of the lithium nickel composite oxide.

[0036] In the above-mentioned general composition formula (1) representing the above-mentioned lithium-nickel composite oxide, in order t...

Embodiment ）

[0104] Hereinafter, the nonaqueous secondary battery according to Embodiment 1 of the present invention will be described in detail based on examples. However, the present invention is not limited to the following examples.

Embodiment 1

[0106]

[0107] Aqueous ammonia whose pH was adjusted to about 12 by adding sodium hydroxide was added to the reaction vessel, and stirred vigorously while using a metering pump at 23 cm 3 / min, 6.6cm 3 The ratio of / min drops mixed aqueous solution and the ammoniacal liquor of 25 mass % concentration respectively thereinto, thus the co-precipitation compound (spherical coprecipitation compound) of Ni and Mn and Co is synthesized, and described mixed aqueous solution is respectively with 2.4mol / dm 3 , 0.8mol / dm 3 , 0.8mol / dm 3 The concentration contains a mixed aqueous solution of nickel sulfate, manganese sulfate and cobalt sulfate. In addition, at this time, the temperature of the reaction solution was kept at 50°C, and a 6.4mol / dm 3 The dropwise addition of concentrated sodium hydroxide aqueous solution, so that the pH of the reaction solution is maintained at around 12, further, with 1dm 3 Nitrogen gas was blown in at a flow rate of / min.

[0108] The above coprecip...

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PUM

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Abstract

Disclosed are: a positive electrode material that can constitute a composition containing a positive electrode mixture having minimal deterioration over time and which can be produced with excellent productivity; a method for production therefor; a nonaqueous rechargeable battery with excellent storage properties and which is resistant to swelling when stored under high temperatures; and an electrode that can be used to constitute said battery. The positive electrode material is provided by forming a coating layer made from an organic silane compound on the surface of a positive electrode active substance made from a lithium nickel compound oxide represented by the general composition formula Li1 + xMO2 [where -0.5 <= x <= 0.5, and M represents a group of at least two elements containing Ni and at least one element selected from Mn and Co, and with the percentages (mol%) of Ni, Mn and Co, which constitute M, set to a, b and c respectively, being 20 <= a <(100, 50 <= a + b + c <= 100], wherein the titer when titering the supernatant liquor obtained by mixing and stirring 20 g of said oxide with 100 ml of distilled water in a nitrogen atmosphere for 1 hour, with 0.2 mol / L of hydrochloric acid, is 0.5 to 150 ml.

Description

technical field [0001] The present invention relates to a positive electrode material usable in a nonaqueous secondary battery, a method for producing the same, a positive electrode for a nonaqueous secondary battery, and a nonaqueous secondary battery. Background technique [0002] In recent years, with the development of portable electronic devices such as mobile phones and notebook personal computers, and the practical use of electric vehicles, the demand for non-aqueous secondary batteries with high energy density is rapidly increasing. At present, lithium cobalt oxide (LiCoO 2 ) represented by lithium cobalt oxide, lithium nickelate (LiNiO 2 ) represented lithium-nickel composite oxide, lithium manganese oxide (LiMn 2 o 4 ) as a representative lithium manganese composite oxide as the positive electrode active material. [0003] Among them, lithium nickelate exhibits a higher charge-discharge capacity than lithium cobaltate, and can be solved with a small amount of c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/525H01M4/36H01M4/48H01M4/505
CPCH01M4/505Y02E60/122H01M2004/028H01M4/525Y02T10/7011H01M10/0525H01M4/62H01M4/366H01M4/0404Y02E60/10H01M4/131H01M4/1391Y02T10/70Y02P70/50
Inventor 大矢正幸岸见光浩河野聪
Owner HITACHI MAXELL ENERGY LTD
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