Researchers invent new coating to make lithium battery 18650 more stable

　　In laboratory tests, the coating significantly extended the life of the battery, and it also dealt with combustion issues by greatly limiting the lithium evolution that penetrated the separator between the positive and negative electrodes of the battery.

　　The researchers note that lithium battery 18650 have at least one-third more energy per pound than lithium-ion batteries and are very lightweight because they use lightweight lithium as the positively charged end rather than heavier graphite. Portable electronics, from laptops to cell phones, would benefit if lithium battery 18650 were more reliable, but the real source of revenue would be cars. The biggest obstacle to electric vehicles is that batteries account for a quarter of the cost, which goes to the core of the production cost of electric vehicles.

　　The capacity of traditional lithium-ion batteries has been developed to its limit, so it is crucial to develop new batteries to meet the high energy density requirements of modern electronic devices.

　　The Stanford and SLAC research teams tested their coating on the positively charged end of a standard metallic lithium battery, called the anode, where lithium deposits typically form. Ultimately, they combined the specially coated anode with other commercially available components to create a fully operational battery. After 160 cycles, their lithium metal battery can still provide 85% of the energy it produced during the first cycle. Ordinary metal lithium batteries will only release about 30% of their energy after so many cycles. Even if they don't explode, they won't be of much use.

　　The new coating blocks the formation of lithium by forming a molecular network that evenly transports charged lithium ions to the electrode. It prevents unnecessary chemical reactions in these batteries and also reduces chemical buildup on the anode before they destroy the battery's ability to deliver power.

　　The research team is currently improving its coating design to test the cells over more cycles and improve capacity retention.

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