Continuous supercritical hydrothermal synthesis: lithium secondary ion battery applications
- Continuous supercritical hydrothermal synthesis: lithium secondary ion battery applications
- 홍승아; 아궁; 김수진; 김재훈; 정경윤; 조병원; 강정원
- supercritical fluids; LiFePO4; metal oxide; Lithium iron phosphate; Cathode-active material; Anode-active material; Supercritical hydrothermal synthesis; Lithium secondary battery
- Issue Date
- Research on chemical intermediates
- VOL 37, NO 2/5, 429-440
- Nanosized lithium iron phosphate (LiFePO4) and transition metal oxide
(MO, where M is Cu, Ni, Mn, Co, and Fe) particles are synthesized continuously in
supercritical water at 25–30 MPa and 400℃ under various conditions for active
material application in lithium secondary ion batteries. The properties of the
nanoparticles, including crystallinity, particle size, surface area, and electrochemical
performance, are characterized in detail. The discharge capacity of LiFePO4 was
enhanced up to 140 mAh/g using a simple carbon coating method. The LiFePO4
particles prepared using supercritical hydrothermal synthesis (SHS) deliver the
reversible and stable capacity at a current density of 0.1 C rate during ten cycles.
The initial discharge capacity of the MO is in the range of 800–1,100 mAh/g, values
much higher than that of graphite. However, rapid capacity fading is observed after
the first few cycles. The continuous SHS can be a promising method to produce
nanosized cathode and anode materials.
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