Optimization of LiFePO_4 synthesis by hydrothermal method

Authors

MUHSİN MAZMAN
ÖMÜR ÇUHADAR
DAVUT UZUN
ERCAN AVCI
EMRE BİÇER
TEVHİT CEM KAYPMAZ
ÜMÜT KADİROĞLU

DOI

10.3906/kim-1303-32

Abstract

Optimization of the LiFePO_4 cathode active material synthesis process in the hydrothermal method consists of many factors, including pH, carbon coating, particle size optimization, sintering and hydrothermal synthesis temperature. The main goal of this study is to determine the effect of particle size, pH and carbon coating on capacity and cycle performance. In this study, LiFePO_4 cathode active materials were prepared at different pH (6.5 and 8.5) and temperature (160 and 180 °C) levels using the hydrothermal method. The hydrothermal synthesis products were sintered at 400, 500, 600, and 700 °C with 5% and 7% carbon source. The initial discharge capacity was observed as 130 mAh g^{-1} for the sample that was sintered at 700 °C. However, a 14% capacity loss was measured after 100 cycles. Additionally, the sample was ground for 10 h in a ball mill and sintered at 700 °C. The capacity was then increased to 151 mAh g^{-1} and the capacity loss was measured as 7% (140 mAh g^{-1}) after 200 cycles.

Keywords

LiFePO_4, Li-ion, battery, cathode, carbon coating

First Page

297

Last Page

308

Recommended Citation

MAZMAN, MUHSİN; ÇUHADAR, ÖMÜR; UZUN, DAVUT; AVCI, ERCAN; BİÇER, EMRE; KAYPMAZ, TEVHİT CEM; and KADİROĞLU, ÜMÜT (2014) "Optimization of LiFePO_4 synthesis by hydrothermal method," Turkish Journal of Chemistry: Vol. 38: No. 2, Article 12. https://doi.org/10.3906/kim-1303-32
Available at: https://journals.tubitak.gov.tr/chem/vol38/iss2/12