التفاصيل البيبلوغرافية
| العنوان: |
METHOD FOR PREPARING CATHODE ACTIVE MATERIAL FOR LITHIUM SECONDARY BATTERY |
| Document Number: |
20110042610 |
| تاريخ النشر: |
February 24, 2011 |
| Appl. No: |
12/933629 |
| Application Filed: |
March 24, 2009 |
| مستخلص: |
Disclosed is a method for preparing a cathode active material for a lithium secondary battery, and the preparing method includes: adding a phosphorus compound to a transition metal oxide dispersion liquid to prepare a coating liquid; drying the coating liquid to prepare a powder including phosphorus oxide coated on the surface of the transition metal oxide; and dry-mixing the powder coated with the phosphorus oxide with a lithium intercalation compound, and then firing the mixture to form a solid solution compound of Li-M1-M2-P—O (where M1 is a transition metal derived from transition metal oxide, and M2 is a metal derived from lithium intercalation compound) on the surface of the lithium intercalation compound. The method for preparing a cathode active material for a lithium secondary battery simplifies the conventional preparing process to save process cost, and it provides comparable electrochemical characteristics to a cathode active material obtained from a wet process. |
| Inventors: |
Cho, Jaephil (Yongin-si, KR); Eom, Junho (Pohang-si, KR); Chang, Yoon Han (Hwaseong-si, KR); Park, Chang-Won (Suwon-si, KR); Lee, Seung-Won (Seoul, KR); Jeon, Sang-Hoon (Daegu, KR); Park, Byung Do (Ulsan, KR) |
| Assignees: |
L & F CO. LTD. (Daegu, KR) |
| Claim: |
1. A method for preparing a cathode active material for a lithium secondary battery, comprising: adding a phosphorus compound to a transition metal oxide dispersion liquid to prepare a coating liquid; drying the coating liquid to prepare a powder including phosphorus oxide coated on the surface of a transition metal oxide; and dry-mixing the powder coated with the phosphorus oxide with a lithium intercalation compound, and firing the mixture to form a solid solution compound of Li-M1-M2-P—O (where M1 is a transition metal derived from transition metal oxide, and M2 is a metal derived from lithium intercalation compound) on the surface of the lithium intercalation compound. |
| Claim: |
2. The method for preparing a cathode active material for a lithium secondary battery of claim 1, wherein the phosphorus compound is selected from the group consisting of a phosphate, a phosphonate, and a phosphinate, phosphoric acid, and a combination thereof of a cation selected from the group consisting of ammonium, an alkaline metal, and an alkaline-earth metal. |
| Claim: |
3. The method for preparing a cathode active material for a lithium secondary battery of claim 1, wherein the transition metal oxide has a nano-size. |
| Claim: |
4. The method for preparing a cathode active material for a lithium secondary battery of claim 3, wherein the transition metal oxide has an average particle diameter of 80 to 900 nm. |
| Claim: |
5. The method for preparing a cathode active material for a lithium secondary battery of claim 3, wherein the transition metal oxide is added at 0.1 to 2 parts by weight based on 100 parts by weight of the lithium intercalation compound. |
| Claim: |
6. The method for preparing a cathode active material for a lithium secondary battery of claim 1, wherein the phosphorus compound is added at 0.02 to 10 parts by weight based on 100 parts by weight of the transition metal oxide. |
| Claim: |
7. The method for preparing a cathode active material for a lithium secondary battery of claim 1, wherein the drying process is performed at a temperature ranging from 80 to 200° C. for 8 to 12 hours. |
| Claim: |
8. The method for preparing a cathode active material for a lithium secondary battery of claim 1, wherein the lithium intercalation compound has an average particle diameter of 10 to 30 μm. |
| Claim: |
9. The method for preparing a cathode active material for a lithium secondary battery of claim 1, wherein the phosphorus oxide-coated powder is mixed with the lithium intercalation compound in a weight ratio of 0.02:98.8 to 2:98. |
| Claim: |
10. The method for preparing a cathode active material for a lithium secondary battery of claim 1, wherein the firing process is performed at a temperature ranging from 700 to 1200° C. for 8 to 12 hours. |
| Current U.S. Class: |
2521/821 |
| Current International Class: |
01 |
| رقم الانضمام: |
edspap.20110042610 |
| قاعدة البيانات: |
USPTO Patent Applications |