Panasonic's Si-alloy anode technology to offer 30% increase in battery capacity

Mar 01, 2010 by Lisa Zyga weblog
Si-alloy anodes could accelerate the rate of increase of battery capacity. Capacity has been increasing at about 11% annually until now, but this new development represents an annual increase of 18%. Credit: Panasonic.

(PhysOrg.com) -- One promising modification to next-generation rechargeable Li-ion batteries involves using Si-alloy anodes instead of graphite, which is currently the most common anode material. Many battery manufacturers are developing Si-alloy anodes, with Hitachi Maxell having previously announced plans to begin volume production by the end of fiscal 2009. Now, with its announcement of beginning volume production in 2012, Panasonic is the first company to reveal specifications of its Si-alloy anode product.

Namely, the batteries, which measure 18mm in diameter and 65 mm in length, will offer a 4.0Ah capacity - that's almost 30% higher than the largest capacity (3.1Ah) of today's batteries of the same size. Panasonic plans to use the batteries primarily in PCs, in which the Si-alloy makes it possible to cut the volume of a standard notebook PC pack by about half. Panasonic also hinted at using the batteries in vehicles in the future, although the battery's weight will have to be reduced.

Si-alloy's attraction lies in its high theoretical capacity, which is at least 10 times greater than the capacity of . However, one of the greatest challenges in developing Si-alloy-anode batteries is increasing their short charge/discharge cycle lifetime. During charge and discharge, the batteries have a large volumetric change of about 400%, which decreases their lifetime.

With improved fabrication techniques and other modifications, Panasonic claims to have reduced the deterioration caused by the volumetric change. The company says that its Si-alloy-anode batteries can still maintain at least 80% capacity after 500 charge/discharge cycles. As the tech news site Nikkei notes, Panasonic's commercial launch should further accelerate the Si-alloy development competition.

Explore further: DARPA technology identifies counterfeit microelectronics

More information: via: Nikkei Electronics

Related Stories

Increasing Electric Car Battery Performance

Sep 23, 2009

(PhysOrg.com) -- Researchers have found that by replacing conventional graphite electrodes with silicon nanotube electrodes, lithium-ion batteries can store 10 times more charge.

Recommended for you

Desktop device to make key gun part goes on sale in US

6 hours ago

The creator of the world's first 3D plastic handgun unveiled Wednesday his latest invention: a pre-programmed milling machine that enables anyone to easily make the core component of a semi-automatic rifle.

Twitter-funded lab to seek social media insights

6 hours ago

A new Twitter-funded research project unveiled Wednesday, with access to every tweet ever sent, will look for patterns and insights from the billions of messages sent on social media.

User comments : 0