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Inorganic oxide powder, slurry containing inorganic oxide, lithium ion secondary battery having the slurry and preparation method thereof

A technology of inorganic oxides and secondary batteries, which is applied in the manufacture of secondary batteries, alumina/aluminum hydroxide, electrolyte batteries, etc. It can solve the problems that the target porosity cannot be achieved and achieve high uniformity

Inactive Publication Date: 2011-09-21
SUMITOMO CHEM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] However, when an inorganic oxide porous film is formed using an inorganic oxide powder satisfying the shape, bulk density, average particle diameter, and BET specific surface area described in the above patent documents, the target porosity cannot be achieved and the obtained porous film contains Many coarse aggregate particles, the latter causing problems in the production of porous membranes, so the powder is not necessarily satisfactory as a powder for forming inorganic porous membranes for lithium-ion secondary batteries

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0093] First, aluminum isopropoxide prepared from aluminum having a purity of 99.99% as a raw material was hydrolyzed with water to obtain aluminum hydroxide in the form of slurry, which was then dried to obtain 3 Dry powdered aluminum hydroxide of untamped density.

[0094] Next, the dry powdery aluminum hydroxide was calcined by maintaining at 1200° C. for 3 hours in a gas furnace capable of calcining by combustion of propane gas, and then pulverized by a jet mill to obtain α alumina powder.

[0095] The obtained α-alumina powder has 5.2 m 2 A BET specific surface area per g, an average particle diameter of 0.45 μm, and a content of coarse particles having a particle diameter of 10 μm or higher of 3 ppm or less. Regarding the content of impurities, the Si content was 4 ppm, the Fe content was 7 ppm, the Cu content was 1 ppm, the Na content was 2 ppm, the Mg content was 1 ppm, and the alumina purity was 99.99 wt% or more.

[0096] Next, the obtained α-alumina powders were m...

Embodiment 2

[0100] Aluminum isopropoxide prepared from aluminum having a purity of 99.99% as a raw material was hydrolyzed with water to obtain aluminum hydroxide in a slurry state, which was dried to obtain a first dry powder aluminum hydroxide. Next, wet the first dry powdery aluminum hydroxide with pure water, and then dry to obtain 3 Dry powdered aluminum hydroxide of untamped density.

[0101] Next, the dry powdery aluminum hydroxide was calcined by maintaining at 1220°C for 4 hours, and then pulverized by a jet mill to obtain α-alumina powder.

[0102] The obtained α-alumina powder has 4.13m 2 / g of BET specific surface area, 0.69 μm average particle diameter, 3 ppm or higher content of coarse particles having a particle diameter of 10 μm or higher. However, the level of coarse particles was less than 10 ppm. Regarding the content of impurities, Si content is 11 ppm, Fe content is 10 ppm, Cu content is 1 ppm or less, Na content is 5 ppm or less, Mg content is 1 ppm or less, alumi...

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Abstract

The invention discloses inorganic oxide powder, which is applicable for forming an insulated inorganic oxide porous film on the surface of at least one of an anode, a cathode and a clapboard forming a lithium ion secondary battery. The invention discloses inorganic oxide powder, which forms the insulated inorganic oxide porous film on the surface of at least one of an anode, a cathode and a clapboard used in the lithium ion secondary battery, wherein (1) the purity of an oxide is 90 wt% or higher; (2) according to a mass ratio, the content of coarse particle whose grain diameter is 10 mum or lower is 10 ppm or lower; and (3) the porosity of pressure powder of the inorganic oxide powder obtained in a range of 29 MPa or higher and 147 MPa or lower is 40 percent by volume or higher and 80 percent by volume or lower; the average aperture of the pressure powder is 0.06 mum or higher; and the variable quantity of the porosity per 1 MPa pressure in the event of moulding the pressure powder is 0.020% or higher and 0.060% or lower.

Description

technical field [0001] The present invention relates to an inorganic oxide powder for forming an inorganic oxide porous film having insulating properties on the surface of at least one of a positive electrode, a negative electrode, and a separator used in a lithium ion secondary battery. The present invention also relates to a slurry containing the inorganic oxide powder, and further relates to a lithium ion secondary battery using the slurry, and a method of producing the same. Background technique [0002] Because of its high energy density, lithium ion secondary batteries are used in portable digital instruments such as cellular phones and personal computers, and in addition to these digital instruments, development of lithium ion secondary batteries for automobiles has recently been accelerated. [0003] Generally, a lithium ion secondary battery includes a positive electrode and a negative electrode, and includes a separator placed to electrically insulate spaces betwee...

Claims

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Application Information

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IPC IPC(8): C01F7/02H01M4/62H01M4/139H01M10/058H01M10/0525H01M2/14
CPCY02E60/12Y02E60/122Y02E60/10Y02P70/50
Inventor 藤田纪辉藤原进治
Owner SUMITOMO CHEM CO LTD