Energy return factor analysis of lithium polymer battery during charge/discharge cycles

Electricity is the most convenient form of energy. Conversion to other form of energy from electricity is very easy. Unfortunately during the energy conversion process, there will be an energy loss. Most electricity in the Indonesia is generated at power plants that consumed coal and natural gas. These are fossil fuels that emit carbon dioxide that will contribute significantly to global warming. With the national policy to produce electric vehicle, it is necessary to analyse the energy return factor of the battery as a source for electric energy for the electric vehicle. Preliminary study using a commercial lithium polymer battery have showed that the energy return factor is 80.5% and dropping to 80.4% after 100 cycle of 1C charge and 2C discharge regime. Increasing the energy return factor by understanding the effect of charge/discharge regime will be a benefit for the nation reduction use of coal and natural gas consumption. The EIS study also revealed the mechanism reaction in the charge process and its shows that the trend of electrolyte resistance is decreasing within the raise of SOC.