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Continuous manufacturing method for electrode material

A manufacturing method and electrode material technology, applied in electrode manufacturing, battery electrodes, electrode heat treatment, etc., can solve the problems of rotary furnace blockage, hinder uniform heating, and inability to collect electrode materials, etc., and achieve the effect of stable quality

Inactive Publication Date: 2013-05-08
UBE IND LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, these methods described in prior art documents have problems in terms of productivity such as increase in steps, complicated equipment structure, and reduction in operating efficiency.
For example, the disclosed method of heating and calcination using a rotary furnace has problems in that, during long-term operation, the mixture adheres to and builds up on the inner wall surface of the rotary furnace, hinders uniform heating, and in some In this case, resulting in clogging of the rotary furnace, whereby the electrode material cannot be collected

Method used

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  • Continuous manufacturing method for electrode material

Examples

Experimental program
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Effect test

Embodiment 1

[0075] The mixture (solid concentration: 41% by weight, Li / Ti molar ratio: 0.82) was obtained by adding 29.1% by weight of anatase titanium dioxide particles [TiO 2 : Molecular weight 79.8658] (Sakai Chemical Industry Co., Ltd., SA-1, average primary particle size: 0.15μm, specific surface area: 9.7m 2 / g), 11.0% by weight lithium carbonate particles {Li 2 CO 3 (Molecular weight: 73.8909) (Kennametal Inc., 60M, average primary particle size: 5.3μm, specific surface area: 1.4m 2 / g)}, 58.1% by weight of ion-exchanged water, and 1.8% by weight of ethanol were mixed and prepared. The mixture was dried and calcined using a rotating cylinder with an inclination angle of 5° and a rotation rate of 30 rpm under an air flow of 15 L / min from the output side (furnace body length: 5 m, furnace tube diameter: 20 cm, impeller: from center to Length of leaf tip: 9 cm, 10 leaves). The heating temperature of the rotating cylinder was 700° C. at the input side, 850° C. at the center, and 85...

Embodiment 2

[0079] A lithium-titanium composite oxide compounded with fine carbon fibers was prepared according to the following procedure using a rotary cylinder heater as described in Example 1 and using fine carbon fiber agglomerates, titanium dioxide particles, and lithium hydroxide.

[0080] (1) Preparation of fine carbon fiber dispersion

[0081] 5 parts by weight of fine carbon fiber agglomerates (Ube Industries, Ltd., AMC, specific surface area: 230m 2 / g, average external diameter: 11 nm, average internal diameter: 6 nm, length: 0.5 μm to 10 μm) added to an aqueous solution of 1 weight part of carboxymethylcellulose (Daicel FineChem Ltd., CMC Daicel1110) in 94 parts by weight of ion-exchanged water After mixing, the agglomerates were opened for 40 min using an ultrasonic generator (Nippon Seiki CO., Ltd, ultrasonic homogenizer MODEL US-600T) to disperse the agglomerates to obtain a carbon fiber containing 5% by weight of fine carbon fibers. Fine carbon fiber dispersion.

[0082...

Embodiment 3

[0086] A lithium iron phosphate composite compounded with fine carbon fibers was prepared as follows using a rotating cylinder heater as used in Example 1 and fine carbon fiber agglomerates, magnetite particles, lithium carbonate and lithium phosphate.

[0087] By mixing 21.4% by weight phosphoric acid (H 3 PO 4 Molecular weight: 98.00) (Nippon Chemical Industrial Co., Ltd., purity: 85% by weight), 6.86% by weight of lithium carbonate as used in Example 1, and 34.4% by weight of ion-exchanged water were mixed to obtain lithium dihydrogen phosphate aqueous solution. To this solution was added 14.3% by weight magnetite particles (Fe 3 o 4 Molecular weight: 231.533) (Titan Kogyo Ltd., BL-100, specific surface area: 5.5m 2 / g) and 23.0% by weight of the fine carbon fiber dispersion prepared in Example 2 (1) (fine carbon fiber content is 5% by weight), and then the mixture is mixed under stirring to obtain a mixture (solid content: 22.3 % by weight, Li / Fe molar ratio: 1.00, Li...

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Abstract

The present invention relates to a continuous manufacturing method for electrode material for lithium secondary batteries, said continuous manufacturing method having a step wherein a mixture is obtained by dispersing a transition metal compound in an aqueous solution medium of a lithium compound, and a step wherein the mixture is inserted into a rotating cylinder, dried and fired. The continuous manufacturing method is characterized by the mixture being stirred by a stirring blade provided inside the rotating cylinder.

Description

technical field [0001] The invention relates to a method for continuously manufacturing lithium transition metal composite oxide active materials by utilizing lithium intercalation and extraction, and the active materials can be used as electrode materials for cathodes or anodes of lithium secondary batteries. Background technique [0002] In recent years, rechargeable secondary batteries, such as Ni-MH alkaline storage batteries and lithium secondary batteries, have been practically and widely used as electronic devices are reduced in size, improved in performance, and improved in portability. In particular, the use of lightweight non-aqueous electrolyte lithium secondary batteries with high energy density is expected not only for conventional small information-communication devices such as mobile phones and portable computers but also for industrial applications such as those requiring high output performance large batteries in cars. Therefore, there is a need to develop ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/505C01G23/00H01M4/485H01M4/525H01M4/58
CPCC01P2006/12H01M4/505H01M4/5825Y02E60/122C01G53/50C01G53/42H01M4/525H01M4/0471C01P2006/10C01P2006/40H01M4/139C01B25/45C01G23/005C01P2004/62H01M4/485Y02E60/10H01M4/38
Inventor 竹本博文桥本和生日高敦男
Owner UBE IND LTD
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