ABSTRACT
The propagation test of lithium-ion battery pack was conducted in an environment of air and insulating oil. The test results showed the difference in the phenomenon in which fire propagation to surrounding cells, when a cell composing a battery pack is thermal runaway in two environments. The temperature of the cells in the battery pack was measured during propagation test. A cycle test was also conducted to check whether there was an abnormality in cell performance immersed in insulating oil. The residual capacity and internal resistance, insulation resistance data of the cell are presented in the two environments.
ABSTRACT
Activated carbon was heat-treated to investigate the effect of heat-treating activated carbon on the power and long-term reliability characteristics of LiFePO4-based electrodes. As the heat-treatment temperature of the activated carbon increased, the surface area and total pore volume were decreased. In addition, oxygen functional groups were decomposed and the O/C ratio on the pore surface was reduced. The power and long-term reliability characteristics of the composite electrodes were improved by the use of heat-treated activated carbon, which probably resulted from an increase in the electrical conductivity of the electrodes as the bulk resistance and surface resistance of the heat-treated activated carbon decreased. The diffusion coefficient of the LFP/AC electrode was considerably increased due to the pores of activated carbon.
