Tech Briefs Magazine - May 2022 - BET-11
The INL researchers put the black mass
on one side of the bipolar membrane in a
sulfuric acid - iron sulfate solution, along
with a stir magnet and a stainless-steel
cathode mesh. They put water and a
nickel anode on the other side of the
membrane. They then operated the
chamber at a -0.3 V cathode potential,
causing the cobalt, lithium, manganese,
and nickel to leach out of the cakes at
efficiencies over 96 percent, a near total
recovery of these critical materials from
the shredded Li-ion batteries. The copper
plated out on the electrode and the
graphite also deposited in a form suitable
for further processing.
This material extraction occurred at
room temperature, at an estimated electrical
consumption of 232.3 kWh per ton
of black mass. The researchers calculated
that using the electrochemical approach
would cut the cost of chemicals by as
much as 84 percent as compared to following
the traditional sulfuric acid-hydrogen
peroxide method. In addition to
those cost savings, less chemical consumption
would also mean less environmental
impact from chemical production,
storage, transport, and disposal.
Overall, the decrease in chemical consumption
and room-temperature operation
should shave about 80 percent off
the cost of chemicals and energy, according
to an analysis by the researchers.
Optimization of the process could make
those savings even greater, for both operating
and capital costs.
The electrochemical process has
been patented and research into complementary
processes continues, Lister
said. The output from the leaching process,
for example, is a critical material-rich
solution and the dissolved metals
must be separated and converted
into products suitable for manufacturing
new cathodes. This is an area of
active development, with considerable
progress made toward the final goal of
a sustainable commercial Li-ion battery
recycling process. " We'll have a complete
package we can show somebody, "
he said.
This article is written by Hank Hogan,
President, Hank Hogan Writing and Editorial,
for Idaho National Laboratory (Idaho Falls,
ID). For more info visit http://info.hotims.
com/82321-421.
Battery & Electrification Technology, May 2022
Free Info at http://info.hotims.com/82321-768
11
INL researcher Meng Shi operates the EC-Leach system.
BET Recycling Feature 0522_3.indd 11
Cov
ToC
4/19/22 2:15 PM
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Tech Briefs Magazine - May 2022
Table of Contents for the Digital Edition of Tech Briefs Magazine - May 2022
Tech Briefs Magazine - May 2022 - Intro
Tech Briefs Magazine - May 2022 - Sponsor
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