Mechanoactivation-assisted synthesis and electrochemical characterization of manganese lightly doped LiFePO4
Olivine compounds LiFe1-xMnxPO4 (0.0 = x = 0.3) for cathodes of secondary lithium-ion batteries were synthesized via a mechanoactivation-assisted solid-state reaction. The optimal manganese content and electrochemical performance of the as-synthesized powders were investigated by XRD, EDX mapping, c...
| Main Authors: | , , , , , , |
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| Format: | Journal Article |
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Elsevier B.V.
2010
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| Online Access: | http://hdl.handle.net/20.500.11937/23786 |
| _version_ | 1848751247304163328 |
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| author | Wang, Y. Zhang, D. Yu, X. Cai, R. Shao, Zongping Liao, X. Ma, Z. |
| author_facet | Wang, Y. Zhang, D. Yu, X. Cai, R. Shao, Zongping Liao, X. Ma, Z. |
| author_sort | Wang, Y. |
| building | Curtin Institutional Repository |
| collection | Online Access |
| description | Olivine compounds LiFe1-xMnxPO4 (0.0 = x = 0.3) for cathodes of secondary lithium-ion batteries were synthesized via a mechanoactivation-assisted solid-state reaction. The optimal manganese content and electrochemical performance of the as-synthesized powders were investigated by XRD, EDX mapping, cyclic voltammetry, and charge-discharge characterizations. According to XRD and EDX mapping results, phase-pure compounds with olivine structure were formed after the calcination under nitrogen atmosphere at 700 °C for 20 h. Among the various LiFe1-xMnxPO4 under test, LiFe0.8Mn0.2PO4 showed the highest electrical conductivity, which reached a value of 3.49 × 10-5 S cm-1 at room temperature, more than 5 orders higher than that of pristine LiFePO4 (1.08 × 10-10 S cm-1). Without the carbon coating, pristine LiFe0.8Mn0.2PO4 showed discharge capacity of ~123 and 100 mAh g-1 at 0.1 and 1 C rates, respectively. It means about 91% and 74% of the Fe2+ in LiFe0.8Mn0.2PO4 is electrochemically utilizable correspondingly. For a comparison, they are only 65% and 15% for the pristine LiFePO4 prepared by a similar process. LiFe1-xMnxPO4 also showed stable cycling performance within the 50 cycles under test. It suggests manganese lightly doped LiFePO4 could be practical cathode materials for high-rate lithium-ion batteries. © 2009 Elsevier B.V. All rights reserved. |
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| institution | Curtin University Malaysia |
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| publishDate | 2010 |
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| spelling | curtin-20.500.11937-237862023-08-02T06:39:07Z Mechanoactivation-assisted synthesis and electrochemical characterization of manganese lightly doped LiFePO4 Wang, Y. Zhang, D. Yu, X. Cai, R. Shao, Zongping Liao, X. Ma, Z. Olivine compounds LiFe1-xMnxPO4 (0.0 = x = 0.3) for cathodes of secondary lithium-ion batteries were synthesized via a mechanoactivation-assisted solid-state reaction. The optimal manganese content and electrochemical performance of the as-synthesized powders were investigated by XRD, EDX mapping, cyclic voltammetry, and charge-discharge characterizations. According to XRD and EDX mapping results, phase-pure compounds with olivine structure were formed after the calcination under nitrogen atmosphere at 700 °C for 20 h. Among the various LiFe1-xMnxPO4 under test, LiFe0.8Mn0.2PO4 showed the highest electrical conductivity, which reached a value of 3.49 × 10-5 S cm-1 at room temperature, more than 5 orders higher than that of pristine LiFePO4 (1.08 × 10-10 S cm-1). Without the carbon coating, pristine LiFe0.8Mn0.2PO4 showed discharge capacity of ~123 and 100 mAh g-1 at 0.1 and 1 C rates, respectively. It means about 91% and 74% of the Fe2+ in LiFe0.8Mn0.2PO4 is electrochemically utilizable correspondingly. For a comparison, they are only 65% and 15% for the pristine LiFePO4 prepared by a similar process. LiFe1-xMnxPO4 also showed stable cycling performance within the 50 cycles under test. It suggests manganese lightly doped LiFePO4 could be practical cathode materials for high-rate lithium-ion batteries. © 2009 Elsevier B.V. All rights reserved. 2010 Journal Article http://hdl.handle.net/20.500.11937/23786 10.1016/j.jallcom.2009.12.014 Elsevier B.V. restricted |
| spellingShingle | Wang, Y. Zhang, D. Yu, X. Cai, R. Shao, Zongping Liao, X. Ma, Z. Mechanoactivation-assisted synthesis and electrochemical characterization of manganese lightly doped LiFePO4 |
| title | Mechanoactivation-assisted synthesis and electrochemical characterization of manganese lightly doped LiFePO4 |
| title_full | Mechanoactivation-assisted synthesis and electrochemical characterization of manganese lightly doped LiFePO4 |
| title_fullStr | Mechanoactivation-assisted synthesis and electrochemical characterization of manganese lightly doped LiFePO4 |
| title_full_unstemmed | Mechanoactivation-assisted synthesis and electrochemical characterization of manganese lightly doped LiFePO4 |
| title_short | Mechanoactivation-assisted synthesis and electrochemical characterization of manganese lightly doped LiFePO4 |
| title_sort | mechanoactivation-assisted synthesis and electrochemical characterization of manganese lightly doped lifepo4 |
| url | http://hdl.handle.net/20.500.11937/23786 |