July 08, 2014 
Increasing battery's storage capacity could allow laptops, electric vehicles to run longer
RICHLAND, Wash. - The lithium-ion batteries that power our laptops and electric vehicles could store more energy and run longer on a single charge with the help of a sponge-like silicon material.
Researchers developed the porous material to replace the graphite traditionally used in one of the battery's electrodes, as silicon has in excess of ten times the energy storage capacity of graphite. A paper describing the material's performance as a lithium-ion battery electrode was published today in Nature Communications.
"Silicon has long been sought as a way to enhance the performance of lithium-ion batteries, but silicon swells so much when it is charged that it can break apart, making a silicon electrode inoperable," said Pacific Northwest National Lab Fellow Ji-Guang "Jason" Zhang. "The porous, sponge-like material we've developed gives silicon the room it needs to expand without breaking."
Room for improvement
Rechargeable lithium-ion batteries have 2 electrodes: one that's positively charged and made of lithium and another that's negative and typically consists of graphite. Electricity is generated when electrons flow through a wire that connects the two. To control the electrons, positively charged lithium atoms - which scientists call ions - shuffle from one electrode to the other through another path: the electrolyte solution in which the electrodes sit.
The chemistry of lithium-ion batteries limits how much energy they can store. To increase the battery's energy capacity, researchers are looking at new materials such as silicon. A lithium-ion battery with a silicon electrode could last about 30 percent longer than one with a graphite electrode. Today's average electric vehicle could drive about 130 miles on a single charge if it used a lithium-ion battery with PNNL's silicon electrode.
Unfortunately, silicon expands as much as 3 times in size when it charges, creating pressure within the material that causes it to break. Many scientists have attempted to make tiny, nano-sized battery components with the idea that the smaller size would give silicon enough room to expand, but these efforts haven't produced market-ready technologies.
A sponge solution
Zhang and his PNNL colleagues wondered if a sponge-like silicon electrode would do the trick. Others had etched pores into a silicon electrode's surface, but hadn't succeeded in creating holes throughout the material. So they approached Michael Sailor, a University of California, San Diego chemist whose research includes using porous silicon to detect pollutants and deliver drugs, for help. PNNL used Sailor's method to create porous silicon - placing thin sheets in a chemical bath to etch out tiny holes throughout the material - and then coated the result with a thin layer of conductive carbon to make their electrodes.
Next, the team collaborated with materials scientist Chongmin Wang, who specializes in using in-situ transmission electron microscopes at DOE's EMSL, the Environmental Molecular Sciences Lab at PNNL. Wang uses powerful microscopes to record close-up videos of tiny batteries, allowing researchers to better understand the physical and chemical changes that batteries undergo as they operate. Wang put the team's sponge-like, carbon-coated silicon electrode through a series of charges and discharges under the microscope's careful eye.
Space to grow
The team observed that while being charged, the new electrode mostly expanded into the empty spaces created by the material's porous structure. The outside shape of the electrode only expanded by 30 percent - much less than the 300 percent usually seen in silicon electrodes. And the new electrode didn't break down. After in excess of 1,000 charge-and-discharge cycles, the electrode maintained in excess of 80 percent of its initial energy storage capacity.
Next, Zhang and his colleagues project to develop a larger prototype battery with their silicon sponge electrode. Part of that effort will involve creating a more streamlined production process so their new electrode can be made at a reasonable cost.
This research was funded by the D.O.E.'s Office of Energy Efficiency and Renewable Energy.
Reference: Xiaolin Li, Meng Gu, Shenyang Hu, Rhiannon Kennard, Pengfei Yan, Xilin Chen, Chongmin Wang, Michael J. Sailor, Ji-Guang Zhang and Jun Liu, "Mesoporous Silicon Sponge as an Anti-Pulverization Structure for High-Performance Lithium-Ion Battery Anodes," Nature Communications, July 8, 2014, DOI: 10.1038/ncomms5105.
Tags: Energy, Batteries
EMSL, the Environmental Molecular Sciences Lab, is a national scientific user facility sponsored by the D.O.E.'s Office of Science. Located at Pacific Northwest National Lab in Richland, Wash., EMSL offers an open, collaborative environment for scientific discovery to researchers around the world. Its integrated computational and experimental resources enable researchers to realize important scientific insights and create new technologies. Follow EMSL on Facebook, LinkedIn and Twitter.
Interdisciplinary teams at Pacific Northwest National Lab address many of America's most pressing issues in energy, the environment and national security through advances in basic and applied science. Founded in 1965, PNNL employs 4,300 staff and has an yearly budget of about $950 million. It is managed by Battelle for the D.O.E.'s Office of Science. As the single biggest supporter of basic research in the physical sciences in the United States, the Office of Science is working to address some of the most pressing challenges of our time. For more information on PNNL, visit the PNNL News Center, or follow PNNL on Facebook, Google+, LinkedIn and Twitter.
