Valence Technology (Valence) is an Austin, Texas,
energy storage technology developer that makes lithium iron magnesium phosphate
According to this piece in the Austin Business Journal,
Valence recently won a four-year patent infringement suit against Montreal-based
Lithium (Phostech). See also the Valence press release (Valence_press_release).
The patent-in-suit was Canadian Patent No. 2,395,115 ('115
Patent), entitled "Preparation of lithium-containing materials.
The '115 Patent relates to lithium mixed metal phosphates
for advanced batteries. The materials described in the patent
include LiFe0.9Mg0.1PO4 and are used as the
active material in a battery cathode.
According to the '115 Patent, this material has a better
charge capacity than existing lithium cathode materials. This is
demonstrated in the different specific capacity between the LiFePO4,
plotted in FIG. 2 of the patent, and the new material, LiFe0.9Mg0.1PO4,
shown in FIG. 5.
The '115 Patent explains that FIG. 5 (LiFe0.9Mg0.1PO4) shows
a well defined and sharp peak at about 150 mAh/g (milliamp hours per
gram), while FIG. 2 (LiFePO4) shows a shallow slope leading to
a peak at about 123 mAh/g.
This means that the Fe-phosphate plotted in FIG. 2
provides 123 mAh/g compared to its theoretical capacity of 170 mAh/g, for only
72% specific capacity. The improved Fe/Mg-phosphate material provides 150
mAh/g compared to a theoretical capacity of 160 mAh/g, which is 94% specific
According to Phostech's press release (Phostech_press_release),
the Federal Court of Canada ordered Phostech to cease its current production
and sale of lithium iron phosphate.
View more from Green Patent Blog.
Eric Lane is an
intellectual property lawyer and registered U.S. patent attorney at Luce,
Forward, Hamilton & Scripps in San Diego, where he is
Special Counsel in the Intellectual Property and Climate Change,
Renewable Energy & Sustainable Technology practice groups. Mr.
Lane can be reached at or at firstname.lastname@example.org.
He authors the Green
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