Akademik Veri Yönetim Sistemi
8th Internatıonal conference on materials science and nanotechnology for next generation (MSNG2021), Elazığ, Türkiye, 14 - 17 Temmuz 2021, ss.184-185, (Özet Bildiri)
J. B. Goodenough et al. discovered LiFePO4 batteries in 1997 and it is seen as a promising cathode material
due to its high theoretical capacity (170 mAh/g), low cost, and high safety. One of the important properties
of LiFePO4 batteries is flat voltage plateau (3.4 V vs. Li+/Li) during the discharging process.There are several
common techniques for the production of LiFePO4 such as Solid-state synthesis, hydrothermal sol-gel, and
ball-milling techniques. Among the used techniques, the glass-ceramics techniques have some advantage
such as controlled crystallization and dense grain formation, etc. In this study, we investigated the
production of LiFePO4 by glass-ceramic technique by melting of starting materials at high temperature and
quenching at room temperature to obtain the glass form of the material. It is found that the crystallization of
the LiFePO4 phase from glass form strongly depends on the heating temperature and time.
2.0 2.5 3.0 3.5 4.0 4.5
-80
-60
-40
-20
0
20
40
60
80
Current (mA)
Voltage (V)
Fig.1. CV curve of LiFePO4/Li Coin cell.
The LiFePO4 was used as a cathode material for CR2032 coin cells and The CV of the CR2032 coin cells was
investigated for the voltage window of 2-4.3 V using a scan rate of 0.1 mV s–1 to the determination of anodic
and cathodic reactions in the cells as seen in figure 1. It is well known that the redox reactions in LiFePO4
battery cells are due to Fe2+/Fe3+ in the structure.
In a conclusion, we successfully fabricated LiFePO4 cathode material by a glass-ceramic technique which is
one of the simple and controlled techniques for material production. DTA analysis showed that there are
glass transitions and first crystallization around 550 oC. The battery performance was investigated by
galvanostatic methods and it is found expected capacity on the cells.