All-solid-state secondary cell

Patent metadata

Field	Value
Publication number	US-9634360-B2
Application number	US-201214234118-A
Country	US
Kind code	B2
Filing date	Jul 25, 2012
Priority date	Jul 26, 2011
Publication date	Apr 25, 2017
Grant date	Apr 25, 2017

Abstract

An all-solid-state secondary cell is provided comprising at least a positive electrode, a negative electrode and a solid electrolyte layer which is positioned between the positive electrode and the negative electrode. The positive electrode contains a positive electrode active material consisting of Na 2 S x (x=1 to 8) and the solid electrolyte layer contains an ion conductive glass ceramics represented by a formula (I): Na 2 S-M x S y , wherein M is P, Si, Ge, B or Al; x and y each is an integer giving a stoichiometric ratio depending upon the type of M; and Na 2 S is contained in an amount of more than 67 mole % and less than 80 mole %.

First claim

What is claimed is:

1. An all-solid-state secondary cell comprising at least a positive electrode, a negative electrode and a solid electrolyte layer which is positioned between the positive electrode and the negative electrode, wherein:
the positive electrode contains a positive electrode active material consisting of a Na 2 S x , wherein x=1 to 8, and
the solid electrolyte layer contains an ion conductive glass ceramics having the formula Na 2 S—P 2 S 5 ,
wherein the Na 2 S of the solid electrolyte layer is contained in an amount from 70 to 75 mole %, and
wherein the ion conductive glass ceramics has a state where crystal parts are dispersed in the glass ingredient of an amorphous state and the crystal parts contain tetragonal Na 3 PS 4 .

2. The all-solid-state secondary cell of claim 1 , wherein the Na 2 S x is Na 2 S.

3. The all-solid-state secondary cell of claim 1 , wherein the crystal parts are contained in an amount of 50% by weight or more to the ion conductive glass ceramics as a whole.

4. The all-solid-state secondary cell of claim 1 , wherein the positive electrode further contains Na 2 S-M x S y to be used for the solid electrolyte layer and the positive electrode active material is contained in an amount of within a range of 10 to 90% by weight in the positive electrode.

5. The all-solid-state secondary cell of claim 1 , wherein the negative electrode contains a Na 2 S-M x S y used in the solid electrolyte layer and Sn.

Assignees

• Hayashi Akitoshi
• Tatsumisago Masahiro
• Japan Science & Tech Agency

Inventors

• Hayashi Akitoshi
• Tatsumisago Masahiro

Classifications

• H01M10/3918 Primary

  characterised by the electrolyte · CPC title

• H01M4/5815 Primary

  Sulfides · CPC title

• H01M4/58

  of inorganic compounds other than oxides or hydroxides, e.g. sulfides, selenides, tellurides, halogenides or LiCoFy; of polyanionic structures, e.g. phosphates, silicates or borates · CPC title

• H01M10/054

  Accumulators with insertion or intercalation of metals other than lithium, e.g. with magnesium or aluminium · CPC title

• H01M10/0562 Primary

  Solid materials · CPC title