水熱法製備鋰離子電池之陰極材料LiCoPO4

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水熱法製備鋰離子電池之陰極材料LiCoPO4

Hydrothermal Synthesis of LiCoPO4 Particles as Cathode Materials for Lithium Ion Batteries

何夢璐 , Masters　　Advisor：蔡哲正　　

繁體中文

磷酸鋰鈷；水熱法；鋰離子電池； LiCoPO4 ； hydrothermal ； Lithium ion batteries

Abstract │ Reference (43) │ Altmetrics

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Lithium ion batteries are considered to be one of the most promising energy storage materials because of their high energy density, high discharge capacity, long cycle life and safety. LiCoPO4 cathode material attracts lots of research interests due to high redox potential ( 4.8 V ) and high energy density ( 800 Wh/kg ). However, there are some shortcomings, such as, low electronic conductivity, low lithium ion conductivity, and the decomposition of electrolytes under high potentials, resulting in poor cyclic stability.
LiCoPO4 particles were prepared by hydrothermal method. The syntheses were explored in two conditions: solvothermal process at 220 oC and supercritical fluid method at 400 oC. Fe3+ doping was also conducted in order to improve the electrical performance of LiCoPO4. 
LiCoPO4 particles prepared by supercritical fluid method were much smaller than those prepared by solvothermal method, which mainly have sheet structures. Although, poor electrochemical performance were obtained in this experiment due to non-optimized slurry forming processing, Fe3+ doping actually improved the discharge capacity slightly.

Reference ( 43 ) 〈TOP〉

[2] Alexander Kraytsberg and Yair Ein - Eli, Higher, stronger, better… A Review of 5 Volt Cathode Materials for Advanced Lithium - Ion Batteries, Advanced Energy Materials, 2012, 2, 922 - 939.
連結：
[3] Naoki Nitta and Feixiang Wu et al, Li - ion battery materials: present and future, Materials Today, June 2015, Volume 18, Number 5.
連結：
[4] Zhengliang Gong and Yong Yang, Recent advances in the research of polyanion - type cathode materials for Li - ion batteries, Energy Environmental Science, 2011, 4, 3223 - 3242.
連結：
[5] L. Dimesso and C. Forster et al, Developments in nanostructured LiMPO4 ( M = Fe, Co, Ni, Mn ) composites based on three dimensional carbon architecture, Chem. Soc. Rev., 2010, 41, 5068 - 5080.
連結：
[7] Boucar Diouf and Ramchandra Podel, Potential of lithium - ion batteries in renewable energy, Renewable Energy, 2015, 76, 375 - 380.
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