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Electricity-generating element and nonaqueous-electrolyte battery using the same

A technology for power generation elements and solid electrolyte layers, which is applied in the manufacture of non-aqueous electrolyte batteries, non-aqueous electrolytes, and electrolyte batteries, etc., can solve the problem that metal Li does not have electrochemical stability, and achieve excellent cycle characteristics, reduced losses, high Effect of discharge capacity

Active Publication Date: 2011-07-13
SUMITOMO ELECTRIC IND LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, the disadvantage of the sulfide-based solid electrolyte is that it does not have electrochemical stability to the metal Li deposited at the interface between the solid electrolyte layer and the negative electrode layer during battery charging, so this solid electrolyte is prone to decomposition.

Method used

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  • Electricity-generating element and nonaqueous-electrolyte battery using the same
  • Electricity-generating element and nonaqueous-electrolyte battery using the same
  • Electricity-generating element and nonaqueous-electrolyte battery using the same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0069] Hereinafter, power generating elements according to Examples and Comparative Examples were produced. The yield of the power generating element was evaluated. Each power generating element is manufactured by sequentially stacking a positive electrode layer, a solid electrolyte layer, and a negative electrode layer on a substrate to be formed as a positive electrode current collector. The term "yield" as defined herein means the proportion of a battery that retains its capacity after a predetermined number of charge-discharge cycles.

[0070]

[0071] The stainless steel foil to be formed as the current collector of the positive electrode layer was placed in a vacuum chamber and fixed on a base made of stainless steel, wherein the stainless steel foil was a square of 100 mm×100 mm and a thickness of 100 μm. The surface of the stainless steel foil was cleaned with an Ar ion beam. Next, using a KrF excimer laser, a positive electrode layer containing LiCoO as a positive...

Embodiment 2

[0096] For power generating elements including solid electrolyte layers with different crystalline states, the specific capacity at 10C and the yield of acceptable products were investigated. In addition, the Li ion conductivity of the solid electrolyte layer in the power generation element was also investigated.

[0097]

[0098] (sample 29)

[0099] Sample 29 of Example 1 was produced. In forming the solid electrolyte layer of Sample 29, the solid electrolyte layer was heat-treated at 225°C. Thus, the solid electrolyte layer may be crystalline.

[0100] (Sample 31)

[0101] Sample 31 was fabricated in the same manner as Sample 29 except as described below.

[0102] The difference is that after the solid electrolyte layer is formed on the positive electrode layer, it is heat-treated at 100° C. for 30 minutes.

[0103] (Sample 32)

[0104] Sample 32 was fabricated in the same manner as Sample 29 except as described below.

[0105] The difference is that no heat treatm...

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Abstract

Provided is an electricity-generating element that can be produced with a good yield and has excellent cycling characteristics, and a nonaqueous-electrolyte battery that uses this electricity-generating element. The electricity-generating element is provided with a positive-electrode layer, a negative-electrode layer, and a solid-electrolyte layer disposed between these electrode layers and containing Li, P, S, and O, and is configured so that the O content in the solid-electrolyte layer decreases in steps, or continuously, from the positive-electrode layer side to the negative-electrode layer side. By adopting such a constitution, most of the electricity-generating elements will exhibit stable cycling characteristics (i.e. will have a good ''yield'').

Description

technical field [0001] The present invention relates to a power generating element, which has excellent cycle characteristics and can be produced in a satisfactory yield, and a nonaqueous electrolyte battery having the same. Background technique [0002] In recent years, nonaqueous electrolyte batteries in which charging and discharging are performed by movement of lithium ions between positive electrode layers and negative electrode layers have attracted attention. It has been reported that in such batteries, sulfide-based solid electrolytes with high Li-ion conductivity (e.g., Li 2 S-P 2 S 5 system electrolyte) is used for the electrolyte layer disposed between the positive electrode layer and the negative electrode layer. [0003] However, the disadvantage of the sulfide-based solid electrolyte is that it is not electrochemically stable to the metal Li deposited at the interface between the solid electrolyte layer and the negative electrode layer during battery chargin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0562H01M10/052H01M10/058
CPCH01M10/0562Y02E60/122H01M10/052H01M2300/0068H01M2300/0065Y02E60/10Y02P70/50H01M10/058
Inventor 太田进启上村卓
Owner SUMITOMO ELECTRIC IND LTD
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