Silicon anodes could store 10 times more charge than the graphite anodes in today’s rechargeable lithium-ion batteries
An electrode designed like a pomegranate – with silicon nanoparticles clustered like seeds in a tough carbon rind – overcomes several remaining obstacles to using silicon for a new generation of lithium-ion batteries, say its inventors at Stanford University and the Department of Energy’s SLAC National Accelerator Laboratory.
“While a couple of challenges remain, this design brings us closer to using silicon anodes in smaller, lighter and more powerful batteries for products like cell phones, tablets and electric cars,” said Yi Cui, an associate professor at Stanford and SLAC who led the research, reported today in Nature Nanotechnology.
“Experiments showed our pomegranate-inspired anode operates at 97 percent capacity even after 1,000 cycles of charging and discharging, which puts it well within the desired range for commercial operation.”
The anode, or negative electrode, is where energy is stored when a battery charges. Silicon anodes could store 10 times more charge than the graphite anodes in today’s rechargeable lithium-ion batteries, but they also have major drawbacks: The brittle silicon swells and falls apart during battery charging, and it reacts with the battery’s electrolyte to form gunk that coats the anode and degrades its performance.
Over the past eight years, Cui’s team has tackled the breakage problem by using silicon nanowires or nanoparticles that are too small to break into even smaller bits and encasing the nanoparticles in carbon “yolk shells” that give them room to swell and shrink during charging.
The new study builds on that work. Graduate student Nian Liu and postdoctoral researcher Zhenda Lu used a microemulsion technique common in the oil, paint and cosmetic industries to gather silicon yolk shells into clusters, and coated each cluster with a second, thicker layer of carbon. These carbon rinds hold the pomegranate clusters together and provide a sturdy highway for electrical currents.
And since each pomegranate cluster has just one-tenth the surface area of the individual particles inside it, a much smaller area is exposed to the electrolyte, thereby reducing the amount of gunk that forms to a manageable level.
Although the clusters are too small to see individually, together they form a fine black powder that can be used to coat a piece of foil and form an anode. Lab tests showed that pomegranate anodes worked well when made in the thickness required for commercial battery performance.
While these experiments show the technique works, Cui said, the team will have to solve two more problems to make it viable on a commercial scale: They need to simplify the process and find a cheaper source of silicon nanoparticles. One possible source is rice husks: They’re unfit for human food, produced by the millions of tons and 20 percent silicon dioxide by weight. According to Liu, they could be transformed into pure silicon nanoparticles relatively easily, as his team recently described in Scientific Reports.
“To me it’s very exciting to see how much progress we’ve made in the last seven or eight years,” Cui said, “and how we have solved the problems one by one.”
The Latest on: Lithium ion batteries
via Google News
The Latest on: Lithium ion batteries
- How The Covid-19 Pandemic Is Impacting The Battery Sectoron June 28, 2020 at 3:05 pm
In today’s article I interview industry experts to explore the impact the Covid-19 pandemic is having on the battery sector.
- Lithium Ion Battery Market 2020 - Impact of COVID-19 on Opportunity Assessment, Global Analysis and Forecast Report To 2025on June 26, 2020 at 7:36 am
The scope of the report includes a detailed study of global and regional markets on Lithium Ion Battery Market with the reasons given for variations in the growth of the industry in certain regions.
- American Battery Metals Corporation Assesses Lithium-Ion Supply Chain Economy Amid Global Interruptionon June 26, 2020 at 7:30 am
INCLINE VILLAGE, NV / ACCESSWIRE / June 26, 2020 / American Battery Metals Corporation (OTCQB: ABML ) (the “Company”), an American-owned advanced extraction and battery recycl ...
- Argonne Scientists Make Lithium-Ion Battery Recycling Breakthroughson June 25, 2020 at 9:11 am
The Department of Energy’s ReCell Center at Argonne National Laboratory reported making several lithium-ion battery recycling breakthroughs since opening earlier last year.
- Unlocking the passivation nature of the cathode–air interfacial reactions in lithium ion batterieson June 25, 2020 at 2:06 am
Environmentally triggered degradation at the cathode–air interface is dictated by Li-ion de-intercalation caused by Li+-water interactions. Here, thin disordered rocksalt surface layers are reported ...
- German battery market growth driven by on lithium-ion demand: ZVEIon June 23, 2020 at 11:17 am
Germany's electronics industry saw a strong increase in the battery market last year, spurred by demand for lithium-ion batteries for electric cars in a wider roll-out aimed at cutting carbon ...
- Global Lithium-Ion Battery Separator Market to 2025 - by Manufacturers, Regions, Technology, Application & Product Typeon June 23, 2020 at 9:00 am
Ion Battery Separator Market Insights 2020, Analysis and Forecast Global and Chinese Market to 2025, by Manufacturers, ...
- Cool metric for lithium-ion batteries could spur progresson June 23, 2020 at 5:04 am
A new measure for the rate of heat removal from battery packs gives manufacturers a simple way to compare products.
- Lithium-Ion Battery Separator Market Insights (2020 to 2025) - Analysis and Forecast for the Global and Chinese Marketson June 19, 2020 at 2:37 am
Ion Battery Separator Market Insights 2020, Analysis and Forecast Global and Chinese Market to 2025, by Manufacturers, Regio ...
- Using the game 'Jenga' to explain lithium-ion batterieson June 17, 2020 at 6:54 am
Tower block games such as Jenga can be used to explain to schoolchildren how lithium-ion batteries work, meeting an educational need to better understand a power source that has become vital to ...
via Bing News