Sekisui Chemical Triples* Li-ion Battery Capacity

DEC 11 2013 BY MARK KANE 7

Film-type lithium-ion batteries

Film-type lithium-ion batteries

Earlier this month, Sekisui Chemical Co. announced that it developed a new film-type lithium-ion cells that has three times higher capacity. Sadly, the reference is given as just “compared to other Sekisui Chemical products” without any actual number. The same thing applies to Sekisui’s claim that  it sped up production by 10 times.

Sekisui Chemical has carried out materials technology and process technology development towards realizing the following:

(1) High lithium-ion conductivity (approx. ten times compared to other Sekisui Chemical products) / enhanced safety by using high-performance gel-type electrolyte*1

(2) Enhanced capacity by using high-capacity silicon negative-electrode material

(3) Enhanced productivity (approx. ten times compared to other Sekisui Chemical products) by using a coating process utilizing gel-type electrolyte

We are extremely interested in 2- or 3-times more battery capacity, but such announcements without real data are common, which makes us believe there’s no real progress made here.

The only number that we could find is “900Wh/L,” but this figure seems far less important than gravimetric density, which we hope to see hit 300 Wh/kg sometime soon.

Sekisui Chemical Co. adds that it’s “aiming at quickly realizing products for a variety of uses, including electric vehicles” and after improvements, it will begin the provision of samples from around summer 2014.

Categories: General


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7 Comments on "Sekisui Chemical Triples* Li-ion Battery Capacity"

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The 900Wh/L figure is somewhat important – it just means they can cram more energy into the same physical volume. Increases in gravimetric density without volumetric density means you’re making the same cell (same energy capacity) lighter, which is important, but for something that might be space constrained (like the battery pack area in most compact EVs today) would need higher volumetric density to store more energy.

The flexible shape may help engineers as well.

Yawn.. Wake me when there’s a real product.

Just yesterday I watched a vid of JB Straubel at Stanford mentioning the fact that mass/energy and volume/energy spread of various manufacturers and chemistries within the lithium ion market is about a factor of 3x from bottom to top. So this means that yesterday they made only cheap cells now they make higher-end ones. 🙂

I would love 700 mile range in my Roadster and 100 mile range in my Volt! Bring it on!

This movable shape could help it if say you wanted to put one of these into a I Pad or if you wanted to put batteries in the seats of cars and other odd places in a EV but I really would like to see a working model first before I fun down to the bank and invest all of my life savings into it.

Here is an update to this:

“Sekisui Chemical has developed a material that can triple the capacity of lithium ion batteries, allowing electric vehicles to travel about 600km on a single charge — roughly as far as gasoline-powered cars can go without refilling.”