Industrial Automation Magazine India

Brighsuns Li-S Batteries with 2000 km on single charge to enter industrial trials

Published on : Wednesday 22-04-2020

Brighsuns new technology allows an Li-S battery to keep 91per cent of its initial capacity after 1,700 cycles.

Frankston, AU., April 22, 2020 – Lithium batteries will soon power Electric Vehicles (EVs) traveling 2,000 km on a single charge, say the team at Brighsun New Energy. The company is preparing for industrial trials later in the year for a range of lithium-sulfur (Li-S) batteries that can power a cell phone for over a week and can theoretically travel close to 2,000 km on a single charge. Through nearly 8 years of research, the Brighsun team developed lithium-sulfur (Li-S) batteries with an energy density 5-8 times higher than conventional secondary batteries. According to results from an internationally accredited testing agency (SGS), Brighsun's new technology allows an Li-S battery to keep 91% of its initial capacity after 1,700 cycles at a rate of 2C (being fully charged/discharged in 30 mins). That means the capacity decay per cycle is as low as 0.01%. Even at a more aggressive rate of 5C (being fully charged/discharged in 12.5 mins), Brighsun's Li-S battery retains 74% of its initial capacity after 1,000 cycles (capacity decay per cycle of 0.026%). The cathode energy density for the 1th cycle after activation at charge rate of 1C is 2103.8Wh/kg.

Driven by the growing markets world-wide for EVs, the battery industry has explored a range of chemical combinations: lithium iron phosphate, lithium cobalt oxide and, currently, nickel manganese cobalt. However, current battery systems still suffer from the major disadvantages of relatively low energy density, high raw material costs and secondary pollution during recycling.

Companies in the US, Germany, Korea and China have been developing Li-S batteries and have achieved promising breakthroughs. However, these systems still face a number of challenges, including volume expansion of cathode materials during cycling, the shuttling effect of polysulfides, and the dendritic growth of lithium on the anode. This results in shorter cycling life and poor fast-charging capability, both major obstacles to their application in the world automotive industry.

Brighsun has patented Li-S battery technology that prevents the generation of polysulfide on the sulfur cathode and effectively suppresses dendritic growth of Li on the anode Li-S, paving the way for Li-S battery use in EVs.

The main raw materials for Brighsun's Li-S batteries are widely available in Australia, with a supply sufficient for hundreds of years. Indeed, at under AUD100 for 1kWh, the expected production cost of Brighsun-branded 2U Li-S batteries is lower than conventional lithium ion batteries – providing a major boost to the development of electric vehicle and related industries in Australia and around the world.