LiFePO4 was prepared by hydrothermal method starting from CH3COOLi, FeSO4, and (NH4)2HPO4 at 170 °C. The particle size of the obtained LiFePO4 was about 3 μm. The performance of the LiFePO4 as a positive electrode material for rechargeable lithium battery was evaluated in an organic electrolyte. The LiFePO4 exhibited a discharge capacity of 145 mA h g−1 at the electrode potential of 3.5 V vs Li/Li+.
A carbon-coated platelike
LiFePnormalO4
particle (space group:
Pnma
) was prepared by employing a hydrothermal method at
190°C
. The obtained particle had a preferred crystal orientation with a (020) texture, which was revealed by transmission electron microscopy and electron diffraction. After the hydrothermal treatment, further heat-treatments at high temperatures
(400–800°C)
were carried out to increase the electrical conductivity of the carbon layer, and the conductivity was considerably improved by heat-treatment at temperatures higher than
700°C
. The obtained
LiFePnormalO4∕C
particle exhibited a high-rate charge–discharge capability in a liquid electrolyte of
1.0moldm−3
LiPnormalF6
/ethylene
carbonate+diethyl
carbonate (1:1 volume ratio). The discharge capacity of the particle was more than
100mAhnormalg−1
at a discharge rate of
10C
. Furthermore, an all-solid-state cell comprising Li/polymer electrolyte/
LiFePnormalO4
was fabricated using a block copolymer electrolyte consisting of polyethylene oxide and polystyrene, and the charge–discharge performance of the cell was examined at
30°C
. The all-solid-state cell exhibited a discharge capacity of
122mAhnormalg−1
at a rate of
0.5C
(147μAcm−2)
even at around room temperature.
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