Electrode, method for manufacturing the same, and secondary battery

Patent metadata

Field	Value
Publication number	US-9859595-B2
Application number	US-201414772485-A
Country	US
Kind code	B2
Filing date	Mar 20, 2014
Priority date	Apr 11, 2013
Publication date	Jan 2, 2018
Grant date	Jan 2, 2018

Abstract

An electrode includes a plant-derived porous carbon material. When a peak value of an O(1s) spectrum of the porous carbon material obtained by X-ray photoelectron spectroscopy is defined as P O , and a peak value of a C(1s) spectrum thereof is defined as P C , P O /P C ≦0.05, or an oxygen-containing functional group has been removed from a surface of the plant-derived porous carbon material.

First claim

The invention claimed is:

1. An electrode, comprising:
a porous carbon material that comprises an oxygen-containing functional group,
wherein a ratio of P O /P C ≦0.05 is satisfied,
wherein the P O corresponds to a first peak area of an O (1s) spectrum of the porous carbon material obtained by X-ray photoelectron spectroscopy, and the P C corresponds to a second peak area of a C (1s) spectrum, and
wherein the porous carbon material is derived from a plant-derived material.

2. The electrode according to claim 1 , wherein a portion of the oxygen-containing functional group is removed from a surface of the porous carbon material.

3. The electrode according to claim 1 , wherein the oxygen-containing functional group is one of a carboxy group, a lactone group, a phenol group, a carbonyl group, an ether group, a quinone group, or a hydroxyl group.

4. The electrode according to claim 1 , wherein the porous carbon material has a value of specific surface area by a nitrogen BET method of 100 m 2 /g or more, a pore volume by a BJH method of 0.1 cm 3 /g or more, and a pore volume by an MP method of 0.1 cm 3 /g or more.

5. The electrode according to claim 1 , wherein the porous carbon material including the plant-derived material has a silicon content of 5% by mass or more as a raw material.

6. A secondary battery, comprising:
an electrode containing a porous carbon material, wherein the porous carbon material comprises an oxygen-containing functional group; and
a negative electrode,
wherein a ratio of P O /P C ≦0.05 is satisfied,
wherein the P O corresponds to a first peak area of an O (1s) spectrum of the porous carbon material obtained by X-ray photoelectron spectroscopy, and the P C corresponds to a second peak area of a C (1s) spectrum, and
wherein the porous carbon material is derived from a plant-derived material.

7. The secondary battery according to claim 6 , wherein a portion of the oxygen-containing functional group is removed from a surface of the porous carbon material.

8. The secondary battery according to claim 6 , wherein the oxygen-containing functional group is one of a carboxy group, a lactone group, a phenol group, a carbonyl group, an ether group, a quinone group, or a hydroxyl group.

9. The secondary battery according to claim 6 , wherein the porous carbon material has a value of specific surface area by a nitrogen BET method of 100 m 2 /g or more, a pore volume by a BJH method of 0.1 cm 3 /g or more, and a pore volume by an MP method of 0.1 cm 3 /g or more.

10. The secondary battery according to claim 6 , wherein the porous carbon material comprises the plant-derived material has a silicon content of 5% by mass or more as a raw material.

11. The secondary battery according to claim 6 , wherein a positive electrode is made from the electrode.

12. The secondary battery according to claim 11 , wherein the secondary battery is made from an air-metal secondary battery.

13. The secondary battery according to claim 12 , wherein the secondary battery is made from an air-lithium secondary battery.

14. A method of manufacturing an electrode including a porous carbon material which further comprises an oxygen-containing functional group, the method comprising:
removing a portion of the oxygen-containing functional group from a surface of the porous carbon material;
satisfying a ratio of P O /P C ≦0.05,
wherein the P O corresponds to a first peak area of an O (1s) spectrum of the porous carbon material obtained by X-ray photoelectron spectroscopy, and the P C corresponds to a second peak area of a C (1s) spectrum;
obtaining the porous carbon material by carbonizing a plant-derived material at a first temperature that is in range of 400° C. to 1400° C.;
treating the plant-derived material with an acid or an alkali; and
heating the plant-derived material at a second temperature that is higher than the first temperature.

15. The method for manufacturing the electrode according to claim 14 , wherein the oxygen-containing functional group is one of a carboxy group, a lactone group, a phenol group, a carbonyl group, an ether group, a quinone group, or a hydroxyl group.

16. The method for manufacturing the electrode according to claim 14 , wherein the porous carbon material has a value of specific surface area by a nitrogen BET method of 100 m 2 /g or more, a pore volume by a BJH method of 0.1 cm 3 /g or more, and a pore volume by an MP method of 0.1 cm 3 /g or more.

17. The method for manufacturing the electrode according to claim 14 , wherein the porous carbon material comprises a plant-derived material having a silicon content of 5% by mass or more as a raw material.

18. The method for manufacturing the electrode according to claim 14 , wherein a silicon component is removed from the plant-derived material after carbonization, by treatment with the acid or the alkali.

Assignees

• Sony Corp

Inventors

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

Classifications

• H01M4/96

  Carbon-based electrodes · CPC title

• H01M2220/30

  Batteries in portable systems, e.g. mobile phone, laptop · CPC title

• C01B32/336

  characterised by gaseous activating agents · CPC title

• H01M12/08 Primary

  composed of a half-cell of a fuel-cell type and a half-cell of the secondary-cell type · CPC title

• C01B32/05

  Preparation or purification of carbon not covered by groups C01B32/15, C01B32/20, C01B32/25, C01B32/30 · CPC title