Lithium solid battery, lithium solid battery module, and producing method for lithium solid battery

Patent metadata

Field	Value
Publication number	US-2016351952-A1
Application number	US-201415106172-A
Country	US
Kind code	A1
Filing date	Dec 11, 2014
Priority date	Dec 26, 2013
Publication date	Dec 1, 2016
Grant date	—

Abstract

A problem of the present invention is to provide a lithium solid battery in which generation of short-circuits caused by dendrite is inhibited. The present invention solves the problem by providing a lithium solid battery comprising a solid electrolyte layer having a sulfide glass containing an ion conductor which has a Li element, a P element and a S element, and having an average pore radius calculated by mercury press-in method being 0.0057 μm or less.

First claim

1 . A lithium solid battery comprising a solid electrolyte layer having a sulfide glass containing an ion conductor which has a Li element, a P element and a S element, and having an average pore radius calculated by mercury press-in method being 0.0057 μm or less.

2 . The lithium solid battery according to claim 1 wherein the sulfide glass has the ion conductor and LiI,
the ion conductor has PS 4 3− structure, and a proportion of the PS 4 3− structure to all anion structures of the ion conductor is 50 mol % or more, and
a proportion of the LiI is within a range of 20 mol % to 30 mol %.

3 . The lithium solid battery according to claim 1 wherein an average pore area of the solid electrolyte layer to a plane 100 μm 2 vertical to a thickness direction is 7.30 μm 2 or less.

4 . The lithium solid battery according to claim 1 wherein a pore disconnected distance in the solid electrolyte layer is 3 μm or more.

5 . The lithium solid battery according to claim 1 wherein a pore connected length in the thickness direction in the solid electrolyte layer is 3.7 μm or less.

6 . The lithium solid battery according to claim 1 wherein the battery comprises a cathode active material layer containing a cathode active material, an anode active material layer containing an anode active material, and the solid electrolyte layer formed between the cathode active material layer and the anode active material layer.

7 . The lithium solid battery according to claim 1 wherein the battery comprises an anode current collector, the solid electrolyte layer, the cathode active material layer and a cathode current collector in this order, and
the solid electrolyte layer is provided on the surface of the anode current collector.

8 . The lithium solid battery according to claim 1 wherein the battery comprises an anode current collector, the solid electrolyte layer, the cathode active material layer and a cathode current collector in this order, and
a Li metal anode active material layer deposited on the solid electrolyte layer side surface of the anode current collector.

9 . A lithium solid battery module comprising the lithium solid battery according to claim 1 and a restraining member which applies restraining pressure to the lithium solid battery in the thickness direction.

10 . A producing method for a lithium solid battery comprising a step of a solid electrolyte layer forming step of forming a solid electrolyte layer by pressing a sulfide glass containing an ion conductor which has a Li element, a P element and a S element,
wherein an average pore radius of the solid electrolyte layer calculated by mercury press-in method is 0.0057 μm or less.

Assignees

• Toyota Motor Co Ltd

Inventors

• Ohtomo Takamasa
• Yamasaki Hisatsugu
• Nagase Hiroshi

Classifications

• H01M10/0436

  Small-sized flat cells or batteries for portable equipment · CPC title

• H01M10/0562 Primary

  Solid materials · CPC title

• H01M10/0525

  Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries · CPC title

• H01M10/058

  Construction or manufacture · CPC title

• H01M2300/008

  Halides · CPC title