Eagle Graphite Reports Strong Early Results From Li-Ion Battery Tests
April 08 2019 - 4:00PM
Eagle Graphite Incorporated (TSX VENTURE:EGA) ("Eagle
Graphite", "We", or the "Company") is pleased to report
positive early results from testing for lithium-ion battery anodes.
This work is being performed as part of our ongoing graphite usage
study.
Highlights
- Lithium-ion coin cells were produced using anodes made from
purified and spheronized graphite from Eagle Graphite's quarry in
British Columbia.
- Both uncoated and coated graphite showed excellent 'near
theoretical' results in initial charge-discharge cycling. In both
cases, reversible capacity exceeded typical industry specifications
for lithium-ion batteries.
- The uncoated graphite is undergoing long-term cycling. After 55
cycles, 99.23% of the original reversible capacity remained, which
is viewed as a very strong result.
A leading independent specialist laboratory is under engagement
to optimize process and qualify graphite produced at our Black
Crystal plant for high value markets. The ongoing research, begun
in 2018, has already confirmed potential applicability of our
graphite for a wide range of high value markets.
During this part of the study, CR2016 coin cells were prepared
in accordance with typical industry standards using Li/Li+ counter
electrodes, commonly known as a half-cell design. Graphite produced
from Eagle Graphite's Black Crystal quarry and processing plant was
purified to at least 99.98 %wtC and spheronized to typical
battery industry specifications. Anodes for the CR2016 cells were
prepared using this spheronized and purified graphite, some with
uncoated graphite, and some with graphite coated with soft
carbon.
The independent laboratory has provided a report to the Company
with results from galvanostatic cycling of the coin cells.
Results For Uncoated Graphite
The author of the report states, "The electrochemical
performance on the formation cycles is defined as excellent in that
we are witnessing stable cycling with 361.94 mAh/g of
reversible capacity on the first cycle. Considering that
372 mAh/g is a theoretical maximum for natural graphite, we
define the result for Black Crystal as 'near theoretical'
performance."
Long-term cycling of the uncoated is ongoing, with 55
cycles reported to date.
Cycle |
Capacity, mAh/g |
Irreversible |
Reversible |
1 |
404.19 |
362.77 |
5 |
367.02 |
362.74 |
10 |
368.56 |
362.41 |
25 |
365.30 |
363.09 |
55 |
361.48 |
359.98 |
Table 1: Results of long-term cycling with uncoated purified
spheroidal graphite from Eagle Graphite's Black Crystal
Project.
The report's author comments, "The data show that long-term
cycling performance with the uncoated graphite is extremely stable.
The registered reversible capacity loss, from 362.77 mAh/g to
359.98 mAh/g, amounts to a very low 0.77%, with 99.23% of the
original reversible capacity remaining."
Results For Coated Graphite
Coated graphite "shows a significantly improved result versus
that with the uncoated graphite, which manifests itself in a
greater reversible capacity (364.78 mAh/g vs. 361.94 mAh/g for
coated and uncoated graphites, respectively) and greatly diminished
irreversible capacity loss (i.e. 7.53% vs. 10.45%, respectively, in
the same order)."
Although the study did not include long term cycling of the
coated graphite, the report notes that "cycling stability is
usually even greater with coated samples."
Typical battery industry specifications require initial
reversible capacity of at least 350 mAh/g.
About Eagle Graphite
Eagle Graphite owns the only natural flake graphite facility in
western North America that is constructed and permitted for
production. The Black Crystal quarry and plant are located 35
kilometres west of the city of Nelson in British Columbia, Canada,
70 kilometres north of the state of Washington, USA. The Company's
shares are listed on the TSXV under the symbol "EGA".
Cautionary Statements
Disclosure Regarding Forward-Looking Statements: This release
contains certain "forward-looking information" within the meaning
of applicable securities legislation. Such information is based on
assumptions, estimates, opinions and analysis made by management in
light of its experience, current conditions and its expectations of
future developments as well as other factors which it believes to
be reasonable and relevant. Forward-looking information involves
known and unknown risks, uncertainties and other factors that may
cause our actual results to differ materially from those expressed
or implied in the forward-looking information and accordingly,
readers should not place undue reliance on such information.
Although the Company believes, in light of the experience of its
officers and directors, current conditions and expected future
developments and other factors that have been considered
appropriate, that the expectations reflected in this
forward-looking information are reasonable, undue reliance should
not be placed on them because the Company can give no assurance
that they will prove to be correct. In evaluating forward-looking
information, readers should carefully consider the various factors
which could cause actual results or events to differ materially
from those expressed or implied in the forward looking information.
The statements in this release are made as of the date of this
release. The Company undertakes no obligation to comment on
analyses, expectations or statements made by third parties in
respect of the Company or its securities, its financial or
operating results, as applicable.
Torey Marshall, BSc (Hons), MSc (Geology), MAusIMM(CP), a
"Qualified Person" as defined by NI 43-101, has reviewed and
approved the scientific and technical information in this
release.
Neither the TSXV nor its Regulation Services Provider (as that
term is defined in the policies of the TSXV) accepts responsibility
for the adequacy or accuracy of this release.
Eagle Graphite Incorporated Jamie Deith, President & CEO
(604) 909-4237 jdeith@eaglegraphite.com
Photos accompanying this announcement are available at
http://www.globenewswire.com/NewsRoom/AttachmentNg/e0d3a5a8-fcd0-48c5-be9a-2d99745f6019
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