Positive electrode active material, positive electrode, and rechargeable battery

Patent metadata

Field	Value
Publication number	US-2019296331-A1
Application number	US-201716464103-A
Country	US
Kind code	A1
Filing date	Nov 6, 2017
Priority date	Nov 25, 2016
Publication date	Sep 26, 2019
Grant date	—

Abstract

A positive electrode active material contains conductive silica and sulfur filled in pores of the conductive silica. The conductive silica is preferably a composite containing silica gel and fine particulate carbon dispersed in the silica gel. The positive electrode includes the aforementioned positive electrode active material. A rechargeable battery includes the aforementioned positive electrode.

First claim

1 . A positive electrode active material comprising:
conductive silica; and sulfur.

2 . A positive electrode active material comprising:
conductive silica; and sulfur filled in pores of the conductive silica.

3 . The positive electrode active material according to claim 2 , wherein the conductive silica is a composite comprising:
silica gel; and fine particulate carbon dispersed in the silica gel.

4 . A positive electrode comprising the positive electrode active material according to claim 3 .

5 . A rechargeable battery comprising the positive electrode according to claim 4 .

6 . The rechargeable battery according to claim 5 ,
wherein the negative electrode comprises at least one selected from lithium, sodium, and magnesium.

7 . A positive electrode active material comprising:
a silica gel-carbon composite having:
a specific surface area of 20 to 1000 m 2 /g,
a pore volume of 0.3 to 2.0 ml/g, and
a carbon content of 1 to 50% by mass of the silica gel-carbon composite before addition of other materials; and
sulfur at least partially located inside pores of the silica gel-carbon composite.

8 . The positive electrode active material of claim 7 , wherein:
the specific surface area of the silica gel-carbon composite is between 50 and 275 m 2 /g inclusive; an average pore diameter of the silica gel-carbon composite is between 12 and 53 nm inclusive; the carbon content of the silica gel-carbon composite is between 30 and 35% by mass inclusive; and a mass of the sulfur is approximately equal to a mass of the silica gel-carbon composite.

9 . The positive electrode active material of claim 8 , wherein:
the specific surface area of the silica gel-carbon composite is approximately 275 m 2 /g; the average pore diameter of the silica gel-carbon composite is approximately 12 nm; and the carbon content of the silica gel-carbon composite is approximately 30% by mass.

10 . A positive electrode including:
the positive electrode active material of claim 7 ; a binder; and no conductive additive.

11 . The positive electrode of claim 10 , wherein:
the sulfur is approximately 40% by mass of the positive electrode; the silica gel-carbon composite is approximately 40% by mass of the positive electrode; and the binder is approximately 20% by mass of the positive electrode.

12 . A positive electrode including:
the positive electrode active material of claim 8 ; a binder; and no conductive additive.

13 . The positive electrode of claim 12 , wherein:
the sulfur is approximately 40% by mass of the positive electrode; the silica gel-carbon composite is approximately 40% by mass of the positive electrode; and the binder is approximately 20% by mass of the positive electrode.

14 . A positive electrode including:
the positive electrode active material of claim 9 ; a binder; and no conductive additive.

15 . The positive electrode of claim 14 , wherein:
the sulfur is approximately 40% by mass of the positive electrode; the silica gel-carbon composite is approximately 40% by mass of the positive electrode; and the binder is approximately 20% by mass of the positive electrode.

Assignees

• Fuji Silysia Chemical Ltd
• Univ Nagoya Nat Univ Corp

Inventors

• Kamimura Mitsuhiro
• Ogawa Mitsuteru
• Awaga Kunio
• Zhang Zhongyue
• Wu Yang

Classifications

• C01B33/154

  by acidic treatment of aqueous silicate solutions · CPC title

• C01B33/157

  After-treatment of gels · CPC title

• H01M4/624

  Electric conductive fillers · CPC title

• H01M4/625

  Carbon or graphite · CPC title

• H01M2004/028

  Positive electrodes · CPC title