CIESC Journal ›› 2019, Vol. 70 ›› Issue (7): 2775-2785.DOI: 10.11949/0438-1157.20190027
• Material science and engineering, nanotechnology • Previous Articles Next Articles
Jihua ZHU(),Yao CHEN,Xiulian QIU,Yuming HUANG,Cheng ZHENG,Wei YANG()
Received:
2019-01-09
Revised:
2019-04-16
Online:
2019-07-05
Published:
2019-07-05
Contact:
Wei YANG
通讯作者:
杨伟
作者简介:
朱计划(1992—),男,硕士研究生,<email>497691268@qq.com</email>
基金资助:
CLC Number:
Jihua ZHU, Yao CHEN, Xiulian QIU, Yuming HUANG, Cheng ZHENG, Wei YANG. Preparation of LiMn1-xMgxPO4/C cathode materials by microwave-assisted solvothermal method[J]. CIESC Journal, 2019, 70(7): 2775-2785.
朱计划, 陈姚, 丘秀莲, 黄宇明, 郑成, 杨伟. 微波辅助溶剂热法制备LiMn1-xMgxPO4/C正极材料[J]. 化工学报, 2019, 70(7): 2775-2785.
Fig.1 XRD patterns of microwave-assisted solvothermal samples of LiMn1-xMgxPO4/C (x = 0, 0.025, 0.05, 0.075 and 0.1) and LiMn0.95Mg0.05PO4/C synthesized through different routes
样品 | a/? | b/? | c/? | v/?3 | I020/I311 |
---|---|---|---|---|---|
LiMnPO4/C | 10.445 | 6.107 | 4.751 | 302.36 | 1.08 |
LiMn0.975Mg0.025PO4/C | 10.438 | 6.102 | 4.758 | 301.85 | 1.16 |
LiMn0.95Mg0.05PO4/C | 10.429 | 6.094 | 4.744 | 301.22 | 1.25 |
LiMn0.925Mg0.075PO4/C | 10.421 | 6.085 | 4.742 | 300.71 | 1.18 |
LiMn0.90Mg0.10PO4/C | 10.417 | 6.077 | 4.738 | 299.93 | 1.07 |
Table 1 Refined unit-cell parameters for LiMn1-xMgxPO4/C (x = 0, 0.025, 0.05, 0.075, 0.1)
样品 | a/? | b/? | c/? | v/?3 | I020/I311 |
---|---|---|---|---|---|
LiMnPO4/C | 10.445 | 6.107 | 4.751 | 302.36 | 1.08 |
LiMn0.975Mg0.025PO4/C | 10.438 | 6.102 | 4.758 | 301.85 | 1.16 |
LiMn0.95Mg0.05PO4/C | 10.429 | 6.094 | 4.744 | 301.22 | 1.25 |
LiMn0.925Mg0.075PO4/C | 10.421 | 6.085 | 4.742 | 300.71 | 1.18 |
LiMn0.90Mg0.10PO4/C | 10.417 | 6.077 | 4.738 | 299.93 | 1.07 |
样品 | 比表面积/(m2/g) | 电导率/(S/cm) | 离子扩散系数/(cm2/s) | 碳含量/%(mass) |
---|---|---|---|---|
LiMnPO4/C | 64.2 | 4.5×10-4 | 9.72×10-14 | 7.13 |
LiMn0.975Mg0.025PO4/C | 79.9 | 6.3×10-4 | 1.56×10-13 | 7.21 |
LiMn0.95Mg0.05PO4/C | 88.2 | 7.6×10-4 | 4.32×10-13 | 7.16 |
LiMn0.925Mg0.075PO4/C | 82.8 | 5.4×10-4 | 1.95×10-13 | 7.08 |
LiMn0.90Mg0.1PO4/C | 68.6 | 3.8×10-4 | 8.71×10-14 | 7.11 |
Table 2 Specific surface area, electronic conductivity,lithium-ion diffusion coefficients and carbon content of LiMn1-xMgxPO4/C
样品 | 比表面积/(m2/g) | 电导率/(S/cm) | 离子扩散系数/(cm2/s) | 碳含量/%(mass) |
---|---|---|---|---|
LiMnPO4/C | 64.2 | 4.5×10-4 | 9.72×10-14 | 7.13 |
LiMn0.975Mg0.025PO4/C | 79.9 | 6.3×10-4 | 1.56×10-13 | 7.21 |
LiMn0.95Mg0.05PO4/C | 88.2 | 7.6×10-4 | 4.32×10-13 | 7.16 |
LiMn0.925Mg0.075PO4/C | 82.8 | 5.4×10-4 | 1.95×10-13 | 7.08 |
LiMn0.90Mg0.1PO4/C | 68.6 | 3.8×10-4 | 8.71×10-14 | 7.11 |
Fig.6 Charge/discharge diagrams (a) and rate capability(b) of microwave-assisted solvothermal samples of LiMn1-xMgxPO4/C (x = 0, 0.025, 0.05, 0.075, 0.1) and charge/discharge diagrams (c) and rate capability (d) of LiMn0.95Mg0.05PO4/C synthesized through different routes
Fig.7 CV curves of microwave-assisted solvothermal samples of LiMn1-xMgxPO4/C (x = 0, 0.025, 0.05, 0.075, 0.1) (a) and LiMn0.95Mg0.05PO4/C synthesized through different routes(b) at a scan rate of 0.1 mV/s; LiMn0.95Mg0.05PO4/C synthesized through microwave-assisted solvothermal route at different scan rates (c), plots of cathodic peak current (Ip) as function of square root of scan rate (v1/2) (d)
Fig.8 EIS plots of microwave-assisted solvothermal samples of LiMn1-xMgxPO4/C (x = 0, 0.025, 0.05, 0.075, 0.1) (a) and LiMn0.95Mg0.05PO4/C synthesized through different routes (b)
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