Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1525468 | Materials Chemistry and Physics | 2010 | 4 Pages |
Abstract
Two members of the family of orthosilicate, Li2FeSiO4 and Li2MnSiO4, are prepared by a citric acid assisted sol-gel method. As cathode materials for lithium-ion batteries, their structural, morphological and electrochemical characteristics are investigated and compared. Both cathode materials have nanoparticles with similar lattice parameters. Li2FeSiO4 has a maximum discharge capacity of 152.8 mAh gâ1, and 98.3% of its maximum discharge capacity is retained after fifty cycles. However, the discharge capacity of Li2MnSiO4 fades rapidly and stabilized at about 70 mAh gâ1 after twenty cycles. The electrochemical impedance and differential capacity analysis indicate that Li2MnSiO4 has larger charge transfer impedance and higher electrochemical irreversibility than Li2FeSiO4, which makes its electrochemical behaviors seriously deteriorate and leads to difference between two silicate materials.
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Authors
C. Deng, S. Zhang, B.L. Fu, S.Y. Yang, L. Ma,