Abstract
Today, under the situation of the rapid development of EVs. Li-ion batteries is the first choice to power EVs than any other energy storage system. Many researches are done on various types of batteries with different theoretical and practical energy density and specific energy, where Li-O2 and Li-S battery are considered ultimate alternatives to Li-ion battery, mainly due to their high energy density. Basic mechanisms of these three types of batteries are introduced, and some of the recent researches being done on components of Li-ion battery is briefly discussed. Comparisons on energy density between these three types of batteries are made in the article, where Li-O2 battery has a highest theoretical and practical energy density, followed by Li-S battery, and finally Li-ion battery. By applying a high energy density storage system in EV can further expand the EV market, and hence tend to be potentially beneficial to the global environment.
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