BATTERIES
Spherical graphite boost for silicon anode battery technology
By SNick Flaherty icona is a battery developer commercialising a siliconcomposite
anode that combines silicon with graphite
to improve both capacity and cell density over current
graphite-only battery anodes. It is working with local mining
company Renascor which will supply purified spherical graphite.
The collaboration is expected to include pilot production
trials leading to commercial quantities of the battery anode
material.
Renascor has conducted extensive test work
in developing purified spherical graphite for use
in lithium-ion battery anodes, including having
recently completed a study into a vertically
integrated mine and processing plant and a
downstream spherical graphite operation using
graphite from Renasor’s 100%-owned Siviour
Graphite Project in South Australia.
In the first phase of the MOU with Sicona, Renascor
will provide to Sicona samples of purified
spherical graphite from Siviour, which Sicona will
test in both high performance standard-energy graphite anodes,
as well as next generation silicon-composite anode materials
using Sicona’s proprietary technologies. Testing will include a
full suite of battery performance tests over 250 to 500 cycles,
including specific capacity to measure the charge stored in the
battery and coulombic efficiency to test the charge efficiency
over which electrons are transferred.
“Renascor offers the potential to provide spherical graphite,
the key raw material for battery anode producers, at comparatively
low-cost due to the high quality of the Siviour Project and
Renascor’s extensive development work in respect of producing
spherical graphite.,” said Christiaan
Jordaan, Chief executive of
Sicona.
Sicona’s silicon-composite
anode technology offers the
potential to deliver up to 177
percent higher specific capacity
(mAh/g) and as a result up to 50
percent higher cell energy density
(Wh/kg) than conventional/
standard graphite-only batteries.
“By combining Renascor’s
competitive advantage in spherical graphite with Sicona’s expertise
in silicon-composite battery anodes, we believe we can
produce a next-generation anode that can deliver even greater
efficiencies in battery technologies.”
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