Researchers boost silicon-based batteries

November 1, 2012
Rice University and Lockheed Martin have created a porous silicon powder that may lead to robust, powerful lithium-ion batteries. Fifty milligrams of the treated powder in the right vial has much more surface area than an identical weight of crushed silicon in the left vial. Credit: Jeff Fitlow/Rice University

(—Researchers at Rice University have refined silicon-based lithium-ion technology by literally crushing their previous work to make a high-capacity, long-lived and low-cost anode material with serious commercial potential for rechargeable lithium batteries.

The team led by Rice engineer Sibani Lisa Biswal and research scientist Madhuri Thakur reported in Nature's open access journal Scientific Reports on the creation of a silicon-based anode, the of a battery, that easily achieves 600 charge- at 1,000 milliamp hours per gram (mAh/g). This is a significant improvement over the 350 mAh/g capacity of current graphite anodes.

That puts it squarely in the realm of next-generation competing to lower the cost and extend the range of electric vehicles.

The new work by Rice through the long-running Advanced Nanotechnology Center of Excellence at Rice (LANCER) is the next and biggest logical step since the partners began investigating batteries four years ago.

"We previously reported on making porous silicon films," said Biswal, an assistant professor of chemical and biomolecular engineering. "We have been looking to move away from the film geometry to something that can be easily transferred into the current process. Madhuri crushed the porous silicon film to form porous silicon particulates, a powder that can be easily adopted by battery manufacturers."

A half-cell battery that incorporates a porous silicon developed at Rice University has achieved more than 600 charge-discharge cycles in the lab. The work holds promise for next-generation batteries for electric vehicles. Credit: Jeff Fitlow/Rice University

Silicon can hold 10 times more lithium ions than the graphite commonly used in anodes today. But there's a problem: Silicon more than triples its volume when completely lithiated. When repeated, this swelling and shrinking causes silicon to quickly break down.

Many researchers have been working on strategies to make silicon more suitable for battery use. Scientists at Rice and elsewhere have created nanostructured silicon with a high surface-to-volume ratio, which allows the silicon to accommodate a larger volume expansion. Biswal, lead author Thakur and co-author Michael Wong, a professor of chemical and biomolecular engineering and of chemistry, tried the opposite approach; they etched pores into silicon wafers to give the material room to expand. By earlier this year, they had advanced to making sponge-like silicon films that showed even more promise.

Porous silicon powder mixed with pyrolyzed polyacrylonitrile is the basis for a robust anode for lithium-ion batteries. Anodes developed with the powder at Rice University have achieved more than 600 charge-discharge cycles in the lab. Credit: Madhuri Thakur/Rice University

But even those films presented a problem for manufacturers, Thakur said. "They're not easy to handle and would be difficult to scale up." But by crushing the sponges into porous grains, the material gains far more surface area to soak up lithium ions.

Biswal held up two vials, one holding 50 milligrams of crushed silicon, the other 50 milligrams of porous silicon powder. The difference between them was obvious. "The surface area of our material is 46 square meters per gram," she said. "Crushed silicon is 0.71 square meters per gram. So our particles have more than 50 times the surface area, which gives us a larger for lithiation, with plenty of void space to accommodate expansion." The porous silicon powder is mixed with a binder, pyrolyzed polyacrylonitrile (PAN), which offers conductive and structural support.

"As a powder, they can be used in large-scale roll-to-roll processing by industry," Thakur said. "The material is very simple to synthesize, cost-effective and gives high energy capacity over a large number of cycles."

"This work shows just how important and useful it is to be able to control the internal pores and the external size of the silicon particles," Wong said.

In recent experiments, Thakur designed a half-cell battery with lithium metal as the counter electrode and fixed the capacity of the anode to 1,000 mAh/g. That was only about a third of its theoretical capacity, but three times better than current batteries. The anodes lasted 600 charge-discharge cycles at a C/2 rate (two hours to charge and two hours to discharge). Another anode continues to cycle at a C/5 rate (five-hour charge and five-hour discharge) and is expected to remain at 1,000 mAh/g for more than 700 cycles.

"This successful endeavor between Rice University and Lockheed Martin Mission Systems and Sensors will provide a significant improvement in battery technology by the development of this inexpensive manufacturing technique for silicon ," said Steven Sinsabaugh, a Lockheed Martin Fellow who works with LANCER and a co-author of the paper along with Lockheed Martin researcher Mark Isaacson. "We're truly excited about this breakthrough and are looking forward to transitioning this technology to the commercial marketplace."

"The next step will be to test this porous silicon powder as an anode in a full battery," Biswal said. "Our preliminary results with cobalt oxide as the cathode appear very promising, and there are new cathode materials that we'd like to investigate."

Explore further: Silicon-coated nanonets could build a better lithium-ion battery

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not rated yet Nov 01, 2012
It would be interesting to know the C/20 rate, as most small battery applications have discharge rates much lower than that.
not rated yet Nov 01, 2012
Seems the battery and supercap have much more option to converge, friend of mine has several 3000F 2.5v supercaps with something like 500,000 plus cycles, the 2mA or so self discharge however is a bit high. The low impedance however is very impressive..!

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