Method for preparing carbide-derived carbon-based anode active material and anode active material prepared by the same

Patent metadata

Field	Value
Publication number	US-9266739-B2
Application number	US-201314067635-A
Country	US
Kind code	B2
Filing date	Oct 30, 2013
Priority date	Nov 2, 2012
Publication date	Feb 23, 2016
Grant date	Feb 23, 2016

Abstract

Disclosed is a method for preparing a carbide-derived carbon-based anode active material. The method includes preparing carbide-derived carbon, and expanding pores of the carbide-derived carbon. Here, expanding of pores is performed as an activation process of heating the prepared carbide-derived carbon in the air. The pores formed inside the carbide-derived carbon can be expanded during the activation process in the preparation of the carbide-derived carbon-based anode active material. In addition, by applying the carbide-derived carbon to an anode active material, lithium secondary battery having improved charge-discharge efficiency can be prepared.

First claim

What is claimed is:

1. A method for preparing a carbide-derived carbon-based anode active material comprising:
preparing carbide-derived carbon for anode active material by reacting a carbide precursor with a gas at a temperature higher than 1000° C. and lower than or equal to 1200° C.; and
expanding pores size within the carbide-derived carbon by heating the carbide-derived carbon in air at a temperature ranging from 500° C. to 900° C. for activating the carbide-derived carbon to an anode active material.

2. The method according to claim 1 , wherein the preparing carbide-derived carbon is performed by etching of remaining elements excluding carbon in the carbide precursor through thermochemical reaction of the carbide precursor with the gas, wherein the gas is a halogen group element-containing gas.

3. The method according to claim 2 , wherein the halogen group element-containing gas comprises at least one selected from among Cl 2 , I 2 , and F 2 .

4. A method for preparing a lithium secondary battery, the lithium secondary battery comprising a cathode comprising a lithium-based cathode active material; an anode comprising a carbide-derived carbon-based anode active material; and an electrolyte, the anode active material being prepared by the method according to claim 1 .

Assignees

• Korea Energy Research Inst

Inventors

• Yeon Sun-Hwa
• Shin Kyoung-Hee
• Jin Chang-Soo
• Jung Kyu-Nam
• Yoon Sukeun
• Jeon Jae-Deok
• Shim Joonmok
• Yang Jung-Hoon
• Lee Bum-Suk
• Jeon Myung Seok

Classifications

• Y10T29/49108

  Electric battery cell making · CPC title

• H01M10/052

  Li-accumulators · CPC title

• H01M4/0471 Primary

  involving thermal treatment, e.g. firing, sintering, backing particulate active material, thermal decomposition, pyrolysis · CPC title

• H01M4/587

  for inserting or intercalating light metals · CPC title

• C01B31/10 Primary

  Chemistry & Metallurgy · mapped topic