Lithium-sulfur batteries (Li-S) are a type of rechargeable battery that uses sulfur as the cathode and lithium as the anode. The features and applications of lithium-sulfur batteries are as follows:

Features:
1. High Energy Density: Lithium-sulfur batteries have higher energy density compared to traditional lithium-ion batteries, which makes them highly attractive for electric vehicles and portable electronics.
2. Low Cost: Sulfur is abundant, inexpensive, and environmentally friendly, making lithium-sulfur batteries a cost-effective alternative to lithium-ion batteries.
3. Longer Cycle Life: Lithium-sulfur batteries have a longer cycle life compared to other lithium-ion batteries, which makes them ideal for long-term energy storage.
4. High Safety: Lithium-sulfur batteries are safer than traditional lithium-ion batteries because they are less prone to catching fire or exploding.

Applications:
1. Electric Vehicles (EVs): Lithium-sulfur batteries are an ideal choice for electric vehicles because of their high energy density and low cost. They offer good range and better efficiency when compared to traditional lithium-ion batteries.
2. Portable Electronics: Lithium-sulfur batteries are also used in portable electronics such as smartphones, tablets, and laptops, due to their high energy density and low cost.
3. Aerospace and Defense: Lithium-sulfur batteries are ideal for space missions and military applications because of their high energy density, low weight, and improved safety.
4. Renewable Energy Storage: Lithium-sulfur batteries can be used in renewable energy storage applications such as solar and wind power, due to their long cycle life and high energy density.