Fundamental scientific aspects of lithium ion batteries(Ⅺ)--Lithium air and lithium sulfur batteries

In recent years, rechargeable nonaqueous lithium air battery has attracted wide attention due to its very high theoretical energy density. However, it is at early stage of research because there are still many challenges for developing lithium air battery. In this paper, the concept, structures, challenges of lithium air battery and two special types of lithium air batteries are briefly summarized. In addition, the lithium sulfur battery which also belongs to rechargeable lithium metal battery and has high energy density was introduced.