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Chinese researchers have developed a novel sodium-sulphur (Na-S) battery that offers a cost-effective alternative to lithium-ion batteries, achieving energy densities over 2,000 watt-hours per kilogram and operating at room temperature. With a production cost estimated at A$7.50 per kilowatt-hour, the prototype boasts a discharge voltage of approximately 3.6 volts and can endure about 1,400 charge-discharge cycles. Despite challenges related to the corrosive electrolyte, successful commercialization could significantly reduce renewable energy storage costs and lessen reliance on lithium resources.