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Cathode material for nonaqueous electrolyte secondary battery, its producing method and nonaqueous electrolyte secondary battery

A non-aqueous electrolyte and secondary battery technology, which is applied in the direction of non-aqueous electrolyte batteries, secondary batteries, battery electrodes, etc., can solve the problem of reduced charge/discharge cycle characteristics, achieve excellent charge/discharge cycle characteristics, and suppress quality degradation Effect

Inactive Publication Date: 2004-05-12
PANASONIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the above-mentioned cathode material, the solid phase A, which is one of the two phases, has high crystallinity, and therefore, when absorbing lithium, the stress in the particles may gather in one direction
Therefore, there is a possibility that the charge / discharge cycle characteristics may be degraded due to the destruction of the particles

Method used

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  • Cathode material for nonaqueous electrolyte secondary battery, its producing method and nonaqueous electrolyte secondary battery
  • Cathode material for nonaqueous electrolyte secondary battery, its producing method and nonaqueous electrolyte secondary battery
  • Cathode material for nonaqueous electrolyte secondary battery, its producing method and nonaqueous electrolyte secondary battery

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Embodiment approach 1

[0031] First, the cathode material for a nonaqueous electrolyte secondary battery of the present invention (hereinafter, the "cathode material for a nonaqueous electrolyte secondary battery" is also simply referred to as "cathode material") of the present invention is described.

[0032] The cathode material according to the present invention is a cathode material capable of absorbing and desorbing lithium (Li) for a non-aqueous electrolyte secondary battery; A structure that is completely or partially covered by solid phase B. The cathode material may be in at least one form selected from, for example, solid solution, metal compound and alloy.

[0033] Here, the solid phase A contains at least one element selected from silicon, tin and zinc. Solid phase B includes: at least one element described above contained in solid phase A, and at least one element selected from group IIA elements, transition elements, group IIB elements, group IIIB elements, and group IVB elements.

...

Embodiment approach 2

[0083] Next, the production method of the cathode material used in the nonaqueous electrolyte secondary battery of the present invention will be described.

[0084] As long as the above-mentioned solid phase A and / or solid phase B can be controlled, the production method of the cathode material of the present invention is not particularly limited. For example, in the cathode material production step, the size and condition of the solid phase A can be easily controlled by using mechanical blending (mechanical fusion process).

[0085]For example it is possible to utilize a method comprising the steps of: 1) combining at least one element selected from silicon, tin and zinc with a compound comprising elements selected from group IIA, transition elements, group IIB elements, group IIIB elements and group IVB mixing materials of at least one element of the elements, and melting the resulting material; 2) forming a solidified material by quenching and solidifying the molten materia...

Embodiment approach 3

[0090] In the following, reference will be made to image 3 The nonaqueous electrolyte secondary battery of the present invention is described.

[0091] image 3 is a schematic diagram showing an example of the nonaqueous electrolyte secondary battery of the present invention.

[0092] For example, it can be obtained in the following way image 3 The non-aqueous electrolyte secondary battery shown in . First, an anode 1 and a cathode 2 that reversibly absorb and desorb lithium ions are laminated with a separator 3 interposed therebetween, and the obtained laminate is rolled up. The rolled laminate was placed in a box 5 equipped with a lower insulating plate 4 on the bottom surface, and the entire box was filled with an electrolyte having lithium ion conductivity, and then an upper insulating plate 6 was placed. The resulting structure is then sealed by a gasket 8 with a gasket 7 at its periphery. The anode 1 and the cathode 2 can be electrically connected to external term...

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Abstract

A negative electrode material for a non-aqueous electrolyte secondary battery of the present invention is a negative electrode material for a non-aqueous electrolyte secondary battery capable of reversibly absorbing and desorbing lithium, and it includes a solid phase A and a solid phase B that have different compositions and has a structure in which the surface around the solid phase A is entirely or partly covered by the solid phase B. The solid phase A contains at least one element selected from the group consisting of silicon, tin and zinc, and the solid phase B contains the above-described at least one element contained in the solid phase A, and at least one element selected from the group consisting of Group IIA elements, transition elements, Group IIB elements, Group IIIB elements and Group IVB elements. The atomic arrangement and structure (e.g., crystal structure or amorphous structure) of at least one solid phase selected from the group consisting of the solid phase A and the solid phase B are controlled. It is possible to provide a negative electrode material for a non-aqueous electrolyte secondary battery in which deterioration due to charge / discharge cycle characteristics is suppressed, by using such a material as a negative electrode material for a non-aqueous electrolyte secondary battery. It is also possible to provide a non-aqueous electrolyte secondary battery having excellent charge / discharge cycle characteristics, by including such a negative electrode material for a non-aqueous electrolyte secondary battery.

Description

technical field [0001] The present invention relates to a cathode material for a nonaqueous electrolyte secondary battery, a nonaqueous electrolyte secondary battery using the cathode material, and a method for producing the cathode material for a nonaqueous electrolyte secondary battery. Background technique [0002] In recent years, lithium secondary batteries having characteristics such as high electromotive force and high energy density have been used as energy sources for mobile communication equipment, portable electronic equipment, and the like. For cathode materials, the use of metallic lithium as a single substance will provide lithium secondary batteries with the highest energy density. However, during charging, dendrites tend to deposit on the cathode, thereby possibly causing an internal short circuit during repeated charging / discharging. In addition, the deposited dendrites have a large specific surface area and thus high reactivity, as a r...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B82Y99/00H01M4/134H01M4/36H01M4/38H01M4/42H01M4/58H01M10/05
CPCH01M4/0402Y02E60/122H01M4/366H01M4/58H01M2004/027H01M10/0525H01M2004/021Y02E60/12H01M4/42Y02T10/7011H01M4/38H01M4/386H01M4/387Y02E60/10Y02P70/50
Inventor 岛村治成中本贵之大山秀明美藤靖彦
Owner PANASONIC CORP
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