Tesla will use different batteries for its grid products. Here’s why – Fortune

The batteries that Tesla has been using, sourced from Panasonic, for its Model S electric car are mostly likely a lithium-ion battery with a cathode that is a combination of a lithium, nickel, cobalt, aluminum oxide. The battery industry calls this an “NCA battery” and they’ve been around—and made by Panasonic—for many years.

Tesla-Battery Power For HomesElon Musk, CEO of Tesla.Photograph by Ringo H.W. Chiu — AP

Typically, lithium-ion NCA batteries use a combination of 80% nickel, 15% cobalt and 5% aluminum. It’s unclear what mix Tesla and Panasonic’s battery combination is. (The anodes in these traditional lithium-ion batteries is usually a graphite combination, which acts as a host for the lithium ions.) The addition of the aluminum to the NCA battery makes it more stable.

http://fortune.com/2015/05/18/tesla-grid-batteries-chemistry/

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