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Anode active material and nonaqueous secondary battery including anode having the anode active material

A positive active material, secondary battery technology, applied in secondary batteries, non-aqueous electrolyte batteries, battery electrodes, etc., can solve problems such as battery capacity reduction

Inactive Publication Date: 2012-05-16
SHARP KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The metal Mn precipitated on the negative electrode reacts with lithium ions in the electrolyte, resulting in a significant decrease in battery capacity

Method used

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  • Anode active material and nonaqueous secondary battery including anode having the anode active material
  • Anode active material and nonaqueous secondary battery including anode having the anode active material
  • Anode active material and nonaqueous secondary battery including anode having the anode active material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0181] Zinc oxide was used as the zinc source material, and tin(IV) oxide was used as the tin source material. These materials were weighed so that the molar ratio of zinc to tin was 2:1, and then mixed in an automatic mortar for 5 hours. Furthermore, a calcined product was obtained by firing at 1000° C. for 12 hours under the conditions of an air atmosphere. After calcination, the obtained calcined product was pulverized and mixed with an automatic mortar for 5 hours to prepare a spinel compound.

[0182] Lithium carbonate was used as the lithium source material constituting the lithium-containing oxide, and electrolytic manganese dioxide was used as the manganese source material, and these materials were weighed so that the molar ratio of lithium to manganese became 1:2. Then, the spinel compound and the main crystal phase are weighed so that x=0.05 in the general formula A. Lithium carbonate, electrolytic manganese dioxide, and a spinel compound were mixed in an automatic ...

Embodiment 2

[0191] Synthesis was performed in the same manner as in Example 1, except that the mixing rate x of the spinel compound in the general formula A was changed from x=0.05 to x=0.02. A bipolar battery was produced in the same manner as in Example 1, and a charge-discharge test was performed. The results are shown in Tables 1 and 2.

[0192] In addition, a sample for STEM-EDX analysis was obtained by the same method as in Example 1. Then, shoot with the same method as embodiment 1, obtain the photogram of HAADF-STEM image ( Figure 6 , Figure 8 (a)), EDX-element spectrum photographing ( Figure 7 ) and electron ray diffraction pattern ( Figure 8 (b).

[0193] Depend on Figure 6 , 7 It was confirmed that, similarly to Example 1, the spinel-type compound (secondary crystal phase) in the main crystal phase of the positive electrode active material was formed in layers. and, Figure 8 In the HAADF-STEM image of (a), 8, 10, 11, and 12 represent the main crystal phase, and 9 ...

Embodiment 3

[0195] Synthesis was performed in the same manner as in Example 1, except that the mixing rate x of the spinel-type compound in the general formula A was changed from x=0.05 to x=0.10. A bipolar battery was produced in the same manner as in Example 1, and a charge-discharge test was performed. The results are shown in Tables 1 and 2.

[0196] In addition, a sample for STEM-EDX analysis was obtained by the same method as in Example 1. Then, shoot with the same method as embodiment 1, obtain the photogram of HAADF-STEM image ( Figure 9 , Figure 11 ), EDX-element spectrum photographing ( Figure 10 ), electron ray diffraction pattern ( Figure 12 ).

[0197] Depend on Figure 9 , 10 It was confirmed that, similarly to Example 1, the spinel-type compound (secondary crystal phase) in the main crystal phase of the positive electrode active material was formed in layers. in addition, Figure 11 Among them, 1, 2, 5, 6, and 7 represent the main crystal phase, and 3 and 4 repr...

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Abstract

An anode active material (1) of the present invention for use in a nonaqueous secondary battery, the anode active material includes: a main crystalline phase (2) including a lithium-containing transition metal oxide containing manganese and having a spinel structure; and a sub crystalline phase (3) contained in the main crystalline phase, the sub crystalline phase (3) being identical in oxygen arrangement to the lithium-containing transition metal oxide and different in elementary composition from the lithium-containing transition metal oxide, a main crystalline phase part (2') around the sub crystalline phase (3) and the sub crystalline phase (3) having a same crystal orientation.

Description

technical field [0001] The present invention relates to a positive electrode active material for prolonging the life of a nonaqueous electrolyte secondary battery, and particularly to a nonaqueous electrolyte secondary battery with improved storage properties and charge-discharge cycle life. Background technique [0002] Conventionally, non-aqueous secondary batteries have been frequently used as power sources for portable devices from the viewpoint of economy and the like. There are various types of non-aqueous secondary batteries. At present, the most common type is nickel-cadmium batteries. Recently, nickel-metal hydride batteries are also becoming popular. [0003] Among non-aqueous secondary batteries, lithium secondary batteries using lithium have been partially put into practical use because of their high output potential and high energy density. In addition, in recent years, research has been actively conducted to achieve higher performance. As the positive electro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/505H01M4/131H01M10/0525
CPCH01M4/505C01G45/00C01G45/12Y02E60/122Y02T10/7011H01M4/131H01M10/0525H01M4/36H01M10/052Y02E60/10
Inventor 八尾健江崎正悟西岛主明
Owner SHARP KK
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