Abstract:

Lithium-sulfur (Li-S) battery, has attracted tremendous attention from the energy storage community, mainly due to its high theoretical energy density (～2600 W·h·kg1), which is twice more than that of conventional Li-ion batteries. However, the commercialization of Li-S battery technology is hindered by technical obstacles, such as the poor intrinsic electronic conductivity of sulfur and final discharge products (Li2S/Li2S2), the high dissolution of intermediate product lithium polysulphides (LiPSs), large volumetric expansion (76%) of sulfur cathode during the lithiation, and the irreversible phase transformation and uncontrolled deposition of Li2S. Fortunately, intense research efforts have been devoted to overcoming these unsolved issues. Among these efforts, the most effective strategy is constructing nanocomposite cathodes composed of sulfur with surface and interface decorated carbonaceous materials. Carbon materials with modified surfaces and interfaces for advanced Li-S batteries are summarized in this paper.