Process for preparing high density spherical lithium ferric phosphate |
Title: |
Process for preparing high density spherical lithium ferric phosphate |
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Application Number: |
200610065212 |
Application Date: |
2006/03/20 |
Announcement Date: |
2006/08/23 |
Pub. Date: |
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Publication Number: |
1821065 |
Announcement Number: |
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Grant Date: |
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Granted Pub. Date: |
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ApplicationType: |
Invention |
State/Country: |
11[China|beijing] |
IPC: |
C01B 25/45, H01M 4/58 |
Applicant(s): |
Tsinghua Univ. |
Inventor(s): |
Li Wei, Ying Jierong, Jiang Changyin, Wan Chunrong, Lei Min, Tang Changping, Gao Jian |
Key Words: |
high density, spherical, lithium ferric phosphate |
Abstract: |
The present invention is microwave synthesis process of high density spherical lithium ferric phosphate as the positive electrode material of lithium ion cell, and belongs to the field of energy source material preparing technology. Spherical lithium ferric phosphate is prepared through mixing ferrous sulfate and solid phosphorus in the required Fe/P ratio adding in certain speed into deionized water adding alkali matter to regulate pH value to form the precursor ammonium ferrous phosphate drying the precursor, mixing with lithium acetate in the same ratio, adding proper amount of conducting agent, and high temperature treatment at 600-800 deg.c for 3-30 hr in the protecting atmosphere. Thus prepared spherical lithium ferric phosphate has average grain size of 5-10 microns, tap density 2.0-2.3 g/cu cm, and room temperature initial specific discharge capacity of 140-160 mA/g. The process is simple, low in cost, high in yield and suitable for industrial production. |
Claim: |
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Priority: |
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PCT: |
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