A key 3M patent for lithium ion battery nickel-manganese-cobalt
(NMC) cathode technology has emerged from reexamination at the U.S.
Patent and Trademark Office (USPTO) with all original claims being
confirmed as patentable and with no amendments (U.S. Patent 7,078,128).
NMC cathode technology is widely used in lithium ion batteries for
consumer electronics and electric vehicles. The patented technology
enables lithium ion battery makers to design electrodes for specific
applications for optimum balance of power, energy, stability and cost.
"The value of the 3M innovation in NMC technology lies in the single
phase crystal structure of the cathode materials," said Kevin Eberman,
research manager for 3M's Battery Materials Business. "Practical high
energy battery cathode materials must perform over hundreds of cycles,
and 3M single phase materials show excellent charge-discharge capacity."
"We are very pleased with the USPTO decision, which confirms our
confidence in the patent and in the value of te technology," said
Christian Milker, business manager for 3M's Battery Materials Program.
The performance of single phase crystal structure compared to layered
structures is described by McCalla, Li, Rowe and Dahn in a published
article in the Journal of Electrochemical Society titled, "The
negative impact of layered-layered composites on the electrochemistry of
Li-Mn-Ni-O positive electrodes for lithium ion batteries" where the data
suggested that layered-layered nano-composites should be avoided.
3M pioneered the development of the unique mixed metal oxide cathode
technology in the early 1990s in collaboration with Dr. Jeffrey Dahn, at
Dalhousie University, Nova Scotia.
3M has a number of product solutions and a broad-based technology
portfolio targeting lithium ion batteries including anode powders,
cathode powders and electrolyte additives. For more information on 3M
Battery Materials and NMC cathode licensees visit www.3M.com/batterymaterials.
About 3M3M captures the spark of new ideas and transforms
them into thousands of ingenious products. Our culture of creative
collaboration inspires a never-ending stream of powerful technologies
that make life better. 3M is the innovation company that never stops
inventing. With $31 billion in sales, 3M employs 89,000 people worldwide
and has operations in more than 70 countries. For more information,
or follow @3MNews on Twitter.
[ Back To NFVZone's Homepage ]