Battery start-ups are raising millions of dollars from VCs and corporations such as Volkswagen to commercialize their breakthrough technologies. They believe their batteries are big improvements over the current lithium-ion batteries used by Tesla.
For powering your smartphone or your Tesla Model 3, there's currently nothing better than the lithium-ion battery. Since its introduction in 1991, the rechargeable lithium battery has been the standard for everyday tech devices and electric-vehicle power. Many of the world's more than 3 million electric vehicles run on lithium-ion batteries. But as the world races toward an electric future, it needs something better than the lithium-ion battery in order to keep pace.
Sila is just one of several battery start-ups that recently received major funding to continue tweaking battery tech. Last year the Alameda, California-based company took on $70 million in Series D financing from several investors, including Siemens' global venture firm, to build its first commercial production line for silicon anode batteries.
Each lithium-ion battery is composed of four essential parts: the anode and cathode — the electrodes that bookend each lithium-ion cell — a liquid electrolyte and a separator. Positive and negative currents are created as the electrolyte carries lithium ions through the separator to and from the anode and cathode. It's this process that generates the charge that's stored in the battery.
Yet solid-state batteries probably won't be available en masse until sometime next decade, as one Nissan vice president said last year. Even QuantumScape's press release states a commercial production target for 2025. What's more, most lithium-ion batteries with graphite anodes have a charge-rate, or C rate, of less than 1 percent. Start-ups developing new cells with silicon anodes say the C rates of their batteries are much better, a key differentiator to enabling an electric-vehicle future, since most people don't want to wait around more than an hour for a car to charge when pumping gas takes just minutes.
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