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Modified li-Mg-Ni composite oxides and manufacturing method, Li secondary battery and positive electrode active material

A composite oxide and lithium secondary battery technology, which is applied in secondary batteries, active material electrodes, nickel compounds, etc., can solve the problems of large manganese ion dissolution and discharge capacity, which is only a fraction of the theoretical amount, etc. Achieve excellent cycle characteristics and coulombic efficiency, and inhibit the effect of stripping

Active Publication Date: 2006-01-25
NIPPON CHECMICAL IND CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] However, when the amount of manganese ions eluted in the lithium-manganese-nickel composite oxide is large, and nickel oxide, manganese oxide, and lithium compound are mixed and fired, there is a problem that the actual discharge capacity is only a theoretical amount. a fraction of a problem

Method used

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  • Modified li-Mg-Ni composite oxides and manufacturing method, Li secondary battery and positive electrode active material
  • Modified li-Mg-Ni composite oxides and manufacturing method, Li secondary battery and positive electrode active material
  • Modified li-Mg-Ni composite oxides and manufacturing method, Li secondary battery and positive electrode active material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0118] (first process)

[0119] The above modulated LiMn 1.5 Ni 0.5 o 4 200 g each and 1 g each metal oxide, and mix well with a household mixer for 60 seconds, thereby making each metal oxide adhere to the LiMn 1.5 Ni 0.5 o 4 particle surface. In addition, the BET specific surface area after the first step was measured, and the results are shown in Table 2.

[0120] (second process)

[0121] Next, heat treatment was performed at 500° C. for 5 hours in an alumina furnace. After cooling, crushing and screening are carried out to obtain a modified lithium-manganese-nickel-based composite oxide. Table 2 shows various physical properties of the obtained modified lithium-manganese-nickel composite oxide. figure 1 and figure 2 Electron micrographs of the modified lithium-manganese-nickel-based composite oxides obtained in Example 1 and Example 2 are shown, respectively. Furthermore, the amount of manganese elution was measured in the same manner as above. As a result, t...

reference example 1

[0123] The lithium-manganese-nickel-based composite oxide prepared above without coating treatment was used as a reference sample.

[0124] Metal oxide

Physical properties of lithium-manganese-nickel-based composite oxides

Specimen type

Compounding amount

(weight%)

BET specific surface area

(m 2 / g)

The average particle size

(μm)

Example 1

Sample 1

0.5

0.52

10.6

Example 2

Sample 2

0.5

0.73

10.0

Example 3

Sample 3

0.5

0.64

10.3

[0125] (performance evaluation)

[0126] Using the modified lithium-manganese-nickel-based composite oxide obtained in Examples and the lithium-manganese-nickel-based composite oxide of Reference Example 1 as positive electrode active materials, a lithium secondary battery was produced. The initial discharge capacity of the battery, the coulombic efficiency at the 10th cycle, and t...

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Abstract

The present invention provides a modified lithium manganese nickel-based multiple oxide useful as a positive electrode active material of a lithium secondary battery, its production method, a lithium secondary battery positive electrode active material and a lithium secondary battery excellent in cycle characteristics and coulomb efficiencies.This modified lithium manganese nickel-based multiple oxide is characterized in that the surface of a lithium manganese nickel-based multiple oxide expressed by formula (1): LixMn1.5Ni0.5O4-w(0 H01M 4 / 58 H01M 4 / 48 H01M 4 / 04 C01D 15 / 00 C01G 1 / 02 C01G 45 / 00 C01G 53 / 00 H01M 10 / 40 4 19 2 2005 / 7 / 22 1725534 2006 / 1 / 25 100499222 2009 / 6 / 10 2009 / 6 / 10 2009 / 6 / 10 Nippon Chemical Industry Co., Ltd. Japan Ota Yokuni Komekawa Fumihiro long chun di wanjie 11322 Japan 2004 / 7 / 22 2004-213943

Description

technical field [0001] The present invention relates to a modified lithium-manganese-nickel-based composite oxide useful as a positive electrode active material for a lithium secondary battery, a method for producing the same, a positive electrode active material for a lithium secondary battery, and a lithium secondary battery excellent in cycle characteristics and Coulombic efficiency. Background technique [0002] The present applicant previously proposed a method for producing a lithium-manganese composite oxide useful as a positive electrode active material for a lithium secondary battery (see Patent Documents 1 and 2). The lithium-manganese composite oxide produced according to this production method has the following characteristics: the particle size distribution is narrow and the fluidity is high, it is used as a positive electrode active material of a lithium secondary battery, the initial discharge capacity is high, and the capacity retention rate of the discharge c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/58H01M4/48H01M4/04C01D15/00C01G1/02C01G45/00C01G53/00H01M10/40H01M4/02H01M4/13H01M4/36H01M4/505H01M4/525H01M10/05
CPCH01M4/505Y02E60/122H01M4/525Y02T10/7011H01M4/131H01M10/052H01M4/1391Y02E60/10C01G45/00H01M4/58H01M10/0525
Inventor 太田洋邦米川文广
Owner NIPPON CHECMICAL IND CO LTD
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