Laminate including active material layer and solid electrolyte layer, and all solid lithium secondary battery using the same

A solid electrolyte layer, lithium secondary battery technology, applied in secondary batteries, battery pack parts, electrode carriers/current collectors, etc., can solve the problems of short battery life and difficult to use active materials stably

Inactive Publication Date: 2007-11-21
PANASONIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0026] However, the liquid electrolyte decomposes due to the high working potential of 4.8V
Therefore, batteries using this active material have a problem of short life characteristics
[0027] Also, it has been difficult to use stably like LiCoPO 4 Such active materials with high working potential

Method used

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  • Laminate including active material layer and solid electrolyte layer, and all solid lithium secondary battery using the same
  • Laminate including active material layer and solid electrolyte layer, and all solid lithium secondary battery using the same
  • Laminate including active material layer and solid electrolyte layer, and all solid lithium secondary battery using the same

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Experimental program
Comparison scheme
Effect test

preparation example Construction

[0261] In the production method of the laminate, the active material may be, for example, the first substance such as the first phosphoric acid compound. The solid electrolyte may be a second substance such as a second phosphoric acid compound.

[0262] Next, the preparation method of the all-solid lithium secondary battery of the present invention will be explained.

[0263] By forming the negative electrode active material layer on the first laminated body prepared in the above manner so as to face the positive electrode active material layer with the solid electrolyte layer interposed therebetween, it is possible to prepare a layer comprising the first laminated body and the negative electrode active material layer. An all-solid-state lithium secondary battery composed of at least one combination of the second laminate. When the all-solid lithium secondary battery includes a plurality of the above-mentioned combinations, for example, each combination is stacked with a solid ele...

Embodiment 1-1

[0332] When the sintering method is used as described above to produce the first laminate or the second laminate having an electrochemically active interface between the active material and the solid electrolyte, sintering between the active material and the solid electrolyte is required during sintering No side reactions other than sintering occur at the interface. Therefore, the reactivity between the active material and the solid electrolyte when heated at 800°C was examined.

[0333] First, the reactivity between the positive electrode active material and the solid electrolyte will be explained.

[0334] (Sintered body 1)

[0335] Use LiCoPO4 As a positive electrode active material, and use Li 1.3 Al 0.3 Ti 1.7 (PO 4 ) 3 As a solid electrolyte. The positive electrode active material and the solid electrolyte were crushed in a ball mill to prepare a particle size of about 1 μm. These powders were mixed in a ball mill at a weight ratio of 1:1 and shaped into particles with a dia...

Embodiment 1-2

[0382] The following batteries and comparative batteries were prepared and charged and discharged under predetermined conditions to obtain their discharge capacity.

[0383] (Battery 1)

[0384] First, prepare the Li 1.3 Al 0.3 Ti 1.7 (PO 4 ) 3 Representative solid electrolyte powder and LiCoPO 4 Representative positive electrode active material powder. The solid electrolyte powder is mixed with polyvinyl butyral resin as a binder, n-butyl acetate as a solvent, and dibutyl phthalate as a plasticizer, and zirconium dioxide balls are used in the ball mill The mixture was mixed together for 24 hours to prepare a slurry for forming a solid electrolyte layer.

[0385] A slurry for forming the positive electrode active material layer was also prepared in the same manner as the solid electrolyte layer slurry.

[0386] Subsequently, the solid electrolyte layer slurry was applied to the carrier film 1 mainly composed of polyester resin using a doctor blade. Then, the applied slurry was dri...

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Abstract

Disclosed is a multilayer body comprising an active material layer and a solid electrolyte layer which is bonded to the active material layer by sintering. The active material layer contains a crystalline first substance capable of discharging and adsorbing lithium ions, and the solid electrolyte layer contains a crystalline second substance having lithium ion conductivity. Incidentally, when this multilayer body is analyzed by an X-ray diffraction method, there is detected no component other than the constituents of the active material layer and the constituents of the solid electrolyte layer. Also disclosed is an all-solid lithium secondary battery comprising such a multilayer body and a negative electrode active material layer.

Description

Technical field [0001] The present invention relates to a laminate including a positive electrode active material layer and a solid electrolyte layer, and an all-solid lithium secondary battery using the laminate. technical background [0002] Electronic devices are becoming smaller and smaller, so batteries with high energy density are needed as the main power source or backup power source for these devices. In particular, lithium ion secondary batteries have attracted attention because of their higher voltage and higher energy density than traditional aqueous solutions. [0003] In lithium ion secondary batteries, oxides such as LiCoO are used 2 , LiMn 2 O 4 Or LiNiO 2 As the positive electrode active material, carbon, such as silicon-containing alloy or oxide (such as Li 4 Ti 5 O 12 ) As a negative active material. In addition, the liquid electrolyte contains Li salt dissolved in a carbonate or ether type organic solvent. [0004] However, this liquid ele...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/36H01M4/04H01M4/66H01M4/70H01M2/26C01B25/45H01M10/0562H01M50/543
CPCY02E60/10
Inventor 南野哲郎玉井秀和中西真二井上龙也小林惠治
Owner PANASONIC CORP
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