Electrode material for secondary batteries and manufacturing method thereof, and secondary battery

Patent metadata

Field	Value
Publication number	US-10147938-B2
Application number	US-201314746259-A
Country	US
Kind code	B2
Filing date	Oct 17, 2013
Priority date	Dec 27, 2012
Publication date	Dec 4, 2018
Grant date	Dec 4, 2018

Abstract

Provided is an electrode material for secondary batteries, including a porous carbon material being derived from a plant and having an average particle size of less than 4 μm.

First claim

The invention claimed is:

1. An electrode material for secondary batteries, the electrode material comprising: a porous carbon material being derived from a plant and having an average particle size of less than 4 μm, wherein the porous carbon material comprises first pores having a first pore size of 50 nm or less and a first cumulative pore volume of 0.7 cm 3 /g and second pores having a second pore size of 50 nm to 200 nm and a second cumulative pore volume of more than 0.1 cm 3 /g, and the porous carbon material comprises micropores having a pore size of 0.8 nm to 1 nm.

2. The electrode material according to claim 1 , wherein the porous carbon material has a value of a specific surface area using a nitrogen BET method of 10 m 2 /g or more, and a volume of pores using a BJH method of 0.7 cm 3 /g or more.

3. The electrode material according to claim 1 , wherein the porous carbon material is obtained from a plant-derived material having a silicon content of 5% by mass or more by carbonizing, treating with acid or alkali, and pulverizing the plant-derived material.

4. The electrode material according to claim 1 , wherein the porous carbon material comprises a silicon content of not more than 1% by mass.

5. The electrode material of claim 1 , wherein a specific surface area of the porous carbon material is 400 m 2 /g or more.

6. The electrode material of claim 1 , wherein a volume of pores of the porous carbon material is more than 1 cm 3 /g.

7. A secondary battery comprising: an electrode including a porous carbon material being derived from a plant and having an average particle size of less than 4 μm, wherein the porous carbon material comprises first pores having a first pore size of 50 nm or less and a first cumulative pore volume of 0.7 cm 3 /g and second pores having a second pore size of 50 nm to 200 nm and a second cumulative pore volume of more than 0.1 cm 3 /g, and the porous carbon material comprises micropores having a pore size of 0.8 nm to 1 nm.

8. The secondary battery according to claim 7 , wherein a positive electrode is constituted by the electrode.

9. The secondary battery according to claim 7 , wherein the secondary battery is a lithium-sulfur secondary battery, and wherein the electrode carries sulfur or a sulfur compound.

10. A manufacturing method of an electrode material for secondary batteries, the method comprising: after carbonizing a plant-derived material at 400° C. to 1400° C., performing treatment with acid or alkali on the carbonized material, and then pulverizing the treated material, to obtain the electrode material for secondary batteries including a porous carbon material having an average particle size of less than 4 μm, wherein the porous carbon material comprises first pores having a first pore size of 50 nm or less and a first cumulative pore volume of 0.7 cm 3 /g and second pores having a second pore size of 50 nm to 200 nm and a second cumulative pore volume of more than 0.1 cm 3 /g, and the porous carbon material comprises micropores having a pore size of 0.8 nm to 1 nm.

11. The manufacturing method of an electrode material for secondary batteries according to claim 10 , further comprising: performing, after the pulverizing, heat treatment at a temperature exceeding a temperature during the carbonizing.

12. The manufacturing method of an electrode material for secondary batteries according to claim 10 , wherein the treatment with acid or alkali causes silicon components in the carbonized plant-derived material to be removed.

13. The manufacturing method of an electrode material for secondary batteries according to claim 10 , wherein the plant-derived material has a silicon content of 5% by mass or more.

Assignees

• Sony Corp
• Murata Manufacturing Co

Inventors

• Yamanoi Shun
• Tabata Seiichiro
• Iida Hironori
• Yamada Shinichiro

Classifications

• H01M4/581

  Chalcogenides or intercalation compounds thereof · CPC title

• H01M2004/021

  Physical characteristics, e.g. porosity, surface area · CPC title

• H01M4/0492

  Chemical attack of the support material · CPC title

• H01M4/625

  Carbon or graphite · CPC title

• H01M4/1393

  of electrodes based on carbonaceous material, e.g. graphite-intercalation compounds or CFx · CPC title