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Alpha-ALUMINA, SLURRY, POROUS FILM, LAMINATED SEPARATOR, AND NON-AQUEOUS ELECTROLYTE SECONDARY BATTERY AND METHOD FOR PRODUCING SAME

A technology of non-aqueous electrolyte and α-alumina, which is applied in the field of α-alumina, slurry, laminated diaphragm, non-aqueous electrolyte secondary battery, and porous film, which can solve problems such as short circuit of the diaphragm and safety issues, and achieve the goal of suppressing Bump effect

Active Publication Date: 2021-08-17
SUMITOMO CHEM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when the temperature of the battery is above a predetermined level, the separator may shrink violently to cause a short circuit between the positive electrode and the negative electrode, which poses a problem in terms of safety.

Method used

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  • Alpha-ALUMINA, SLURRY, POROUS FILM, LAMINATED SEPARATOR, AND NON-AQUEOUS ELECTROLYTE SECONDARY BATTERY AND METHOD FOR PRODUCING SAME

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0118] By the Bayer method, the particle diameter D50 corresponding to the volume-based cumulative percentage of 50% is 4 μm, and the BET specific surface area is 1.7 m 2 / g, the amount of Na is 0.03% by mass of aluminum hydroxide powder, and the above-mentioned aluminum hydroxide powder is fired at 1280 ° C for 2 hours through a tunnel furnace to obtain a BET specific surface area of ​​3.8m 2 / g, raw alumina powder having a particle diameter D50 of 5 μm corresponding to a cumulative percentage of 50% on a volume basis.

[0119] Next, 0.2% by mass of propylene glycol (shown as "PG" in Table 1) as an adhesion inhibitor in the pulverizer was added to the above-mentioned raw alumina powder, and the above-mentioned raw alumina powder was pulverized by a jet mill under the following conditions, Thus, α-alumina powder having physical properties shown in Table 1 below was obtained.

[0120] (jet mill conditions)

[0121] Device: PJM-280SP manufactured by Nippon Pneumatic Industry C...

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PUM

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Abstract

The purpose of the present invention is to provide alumina to be used in a slurry capable of suppressing irregularities on the surface of a porous film. The present invention is an alpha-alumina having a crystallite size of 95 nm or less and a lattice strain of 0.0020 or less determined by Rietveld refinement. The BET specific surface area of the alpha-alumina by the nitrogen adsorption method is preferably 10 m2 / g or less. Also, the volume-based cumulative 50% equivalent particle size D50 of the alpha-alumina is preferably 2 [mu]m or less.

Description

technical field [0001] The present invention relates to α-alumina, slurry, porous film, laminated separator, non-aqueous electrolyte secondary battery and its manufacturing method. Background technique [0002] Non-aqueous electrolyte secondary batteries, especially lithium-ion secondary batteries, have high energy density, so they are used in small devices for daily life such as mobile phones and personal computers, and their application to automobiles other than the above-mentioned small devices is also accelerating in recent years . [0003] In a nonaqueous electrolyte secondary battery, a porous separator is usually arranged between a positive electrode and a negative electrode. The separator holds an electrolytic solution, ensures electrical conductivity between the positive electrode and the negative electrode, and isolates the positive electrode from the negative electrode to prevent a short circuit between the positive electrode and the negative electrode. Furtherm...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F7/02C01F7/06H01M4/13H01M4/139H01M10/0566H01M50/431H01M50/403H01M50/449H01M50/491C01F7/441
CPCY02E60/10H01M50/434H01M50/449H01M10/0525C01F7/441C01P2002/60C01P2002/72C01P2002/76C01P2004/51C01P2004/61C01P2004/62C01P2006/12C01P2006/80H01M50/443C01F7/02C01F7/06H01M10/0566H01M4/13H01M4/139C01P2002/90C01P2006/40
Inventor 奈须义总坂元俊介尾崎裕谦
Owner SUMITOMO CHEM CO LTD