Future Timeline

Lithium–sulfur (Li–S) batteries are a promising alternative to lithium–ion batteries (LiBs), the most common rechargeable battery technology. As sulfur is abundant on Earth, these batteries could be cheaper and more environmentally friendly than LiBs, while also potentially exhibiting higher energy densities.

Despite these advantages, the deployment of Li–S batteries has so far been limited, as many of these batteries also have a low cycle life and a high self-discharge rate. In addition, the predicted high energy density of Li–S batteries often becomes far lower when in real applications, due to the high rates at which they charge and discharge.

A chemical reaction that plays a central role in ensuring the high capacity of Li–S batteries is the so-called sulfur reduction reaction (SRR). This reaction has been widely studied, yet its kinetic tendencies at high current rates remain poorly understood.

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India is taking another step in its quest to find valuable minerals hidden in the depths of the ocean which could hold the key to a cleaner future.

The country, which already has two deep-sea exploration licences in the Indian Ocean, has applied for two more amid increasing competition between major global powers to secure critical minerals.

Countries including China, Russia and India are vying to reach the huge deposits of mineral resources - cobalt, nickel, copper, manganese - that lie thousands of metres below the surface of oceans. These are used to produce renewable energy such as solar and wind power, electric vehicles and battery technology needed to battle against climate change.

The UN-affiliated International Seabed Authority (ISA) has issued 31 exploration licences so far, of which 30 are active. Its member countries are meeting in Jamaica this week to discuss regulations around giving out mining licences.

If the ISA approves India's new applications, its licence count will be equal to that of Russia and one less than China.

The pursuit of greener energy also requires efficient rechargeable batteries to store that energy. While lithium-ion batteries are currently the most widely used, all-solid-state sodium batteries are attracting attention as sodium is far more plentiful than lithium. This should make sodium batteries less expensive, and solid-state batteries are thought to be safer, but processing issues mean mass production has been difficult.

Osaka Metropolitan University Associate Professor Atsushi Sakuda and Professor Akitoshi Hayashi, both of the Graduate School of Engineering, led a research team in developing a process that can lead to mass synthesis for sodium-containing sulfides. The results were published in Energy Storage Materials and Inorganic Chemistry

Fudan University team creates battery able to charge and discharge fully 700 times at room temperature, in a first for the calcium-based technology
With calcium 2,500 times more abundant than lithium, battery offers viable option with possibly comparable energy density, team says in Nature paper