http://www.azom.com/news.aspx?newsID=44699
New Silicon-Based Technology Helps Manufacture Smaller, Longer-Lasting
Batteries
October 27, 2015 By Jake Wilkinson
A new treatment that reduces the damage that occurs to silicon anodes upon
charging has been developed. Lithium-ion batteries with silicon anodes have
a higher charge density than conventional graphite anode batteries but are
prone to degradation. This new treatment means silicon anode batteries will
have a performance and service life that exceeds current standards.
[image] Zhongwei Chen
These innovative silicon-based batteries could be used in a range of
electronics from portable devices to electric cars.
The novel silicon battery developed by Chen’s team at the University of
Waterloo is estimated to provide an increased energy density of 40% to 60%.
The technology used has great green credentials as it is environmentally
friendly and could also be used to enhance electric and hybrid vehicles.
The research revealed that the breakthrough technology could enable an
electric car to be driven up to 500 km in between charges. Also, due to the
increased energy density smaller and lighter batteries can be used, reducing
the total weight of the vehicles.
Current lithium-ion use graphite anodes. Chen’s team decided to replace the
graphite anodes with silicon anodes, as silicon possesses a superior
capacity for lithium. Also, the batteries made with the silicon anode
materials can hold 10 times more energy than their graphite based
predecessors.
Graphite has long been used to build the negative electrodes in
lithium-ion batteries. But as batteries improve, graphite is slowly becoming
a performance bottleneck because of the limited amount of energy that it can
store.
Prof. Chen - University of Waterloo
The Waterloo research team faced a serious challenge in the form of energy
loss whilst producing the silicon-based batteries. Energy was lost due to
the contraction and expansion of silicon, with a change in size of 300%,
with every charge/decharge cycle. This continuous increase and decrease in
volume resulted in the formation of cracks in the silicon. The cracks caused
a deterioration in battery performance and the development of short
circuits, which eventually result in the battery failing to function.
Chen’s team partnered with the Global Research and Development Centre at
General Motors to find a viable solution to this issue. Together, they
produced a flash heat treatment for the fabricated silicon-based lithium-ion
electrodes. The treatment reduced the expansion of silicon which improved
the lithium-ion batteries’ cycle capability and performance.
The economical flash heat treatment creates uniquely structured silicon
anode materials that deliver extended cycle life to more than 2000 cycles
with increased energy capacity of the battery.
Prof. Chen - University of Waterloo
Chen hopes that the technology will be commercialized and that a new range
of batteries will hit the market by next year.
The Waterloo research was published in Nature Communications.
[© azom.com]
...
New silicon-based anode set to boost lifetime and capacity of lithium-ion
batteries
Nick Lavars October 26, 2015
Graphite has served the lithium-ion battery world as material for negative
electrodes well so ...
...
http://phys.org/news/2015-10-technology-lighter-long-lasting-batteries-silicon.html
Researchers create technology to produce lighter, long-lasting batteries
from silicon
October 26, 2015
...
http://zeenews.india.com/news/science/new-tech-produces-lighter-long-lasting-batteries-from-silicon_1815228.html
New tech produces lighter, long-lasting batteries from silicon
October 27, 2015
http://asia.nikkei.com/Business/Deals/LG-Chem-Tesla-tie-up-could-jolt-Panasonic
LG Chem, Tesla tie-up could jolt Panasonic
October 28, 2015 KENTARO OGURA
...
http://www.nasdaq.com/article/tesla-gets-boost-from-korean-battery-maker-20151028-00019
Tesla Gets Boost From Korean Battery Maker
By Dow Jones Business News October 28, 2015
'LG Chem batteries for Tesla roadster upgrades'
...
http://seekingalpha.com/article/3610226-teslas-battery-technology-powers-its-moat
Tesla's Battery Technology Powers Its Moat
Oct. 27, 2015
http://www.nature.com/nature/journal/v526/n7575_supp/full/526S93a.html
Lithium batteries: To the limits of lithium
Eric C. Evarts 28 October 2015
Lithium-ion batteries have been credited for revolutionizing communications
and transportation, enabling the rise of super-slim smartphones and electric
cars ...
...
http://www.wantchinatimes.com/news/content?id=20151029000105&cid=1105
2015-10-29 The progress of research into how to reuse old electric vehicle
batteries in China has been slow due to technical difficulties and safety
concerns ...
...
http://www.autonews.com/article/20151029/OEM06/310299945/swatch-mulls-ipo-for-ev-battery-unit-as-vw-scandal-boosts-interest
October 29, 2015 - ZURICH (Bloomberg) -- Swatch Group AG CEO Nick Hayek said
he's considering an initial public offering for the clean-power unit that
builds batteries for electric cars ...
http://www.ft.com/cms/s/0/149ca550-7e30-11e5-a1fe-567b37f80b64.html#axzz3q7PX81S2
Cambridge.uk chemists make super-battery breakthrough
October 30, 2015 Clive Cookson
... a car to drive from London to Edinburgh on a single charge, with
lithium-air batteries that cost and weigh one-fifth of the lithium-ion cells
that power today's electric cars.
https://en.wikipedia.org/wiki/Lithium–air_battery
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