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Cubic Ionic Conductor Ceramics for Alkali Ion Batteries

Brookhaven National Laboratory

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An artist rendition of the structure of the electrode material with intercalated sodium ions shown as spheres

An artist rendition of the structure of the electrode material with intercalated sodium ions shown as spheres

Technology Marketing Summary

Better materials for use as electrodes in lithium or sodium ion batteries are still being sought. Generally, the more positive ions can be accommodated in the electrode, the better for the capacity of the battery. The inventors report a class of compounds having the general formula Na3MIIIP3O9N or Na2MII2P3O9N, where MIII is one or a mixture of trivalent metal ions and MII is one or a mixture of divalent metal ions. They showed that for M = Ti or V sodium can be removed from the compounds by chemical or electrochemical means, and lithium intercalated in the resulting compounds at voltages suitable for batteries. They have further discovered that it is possible to access the vanadium electrochemically to allow its transition from a 2+ to a 5+ state, enhancing the theoretical capacity of the resulting compound to 233 mAh/g for the estimated end member Li3NaVP3O9N.

Description

The present invention relates to novel compositions, electrodes, electrochemical storage devices and ionic conduction devices that use cubic ionic conductor ("CUBICON") compounds, preferably nitridophosphate compounds. The cubic ionic conductor compound have a framework formula [MT3X10]n (1) and a general formula AxMT3X10 (2), where M is a cation in octahedral coordination, T is a cation in tetrahedral coordination, X is an anion, and the framework has a net negative charge of n, where a variable number of additional chemical species, A, can be inserted into the open space within this framework with a net charge of +n.

Benefits

The disclosed structures exhibit a small volume change upon intercalation with alkali ions. They also have the ability to take in more alkali ions than most other battery electrode materials. This leads to a very high theoretical capacity of more than 200 mAh/g.

Applications and Industries

Virtually every electrical device needs some kind of energy storage. Lithium ion batteries are used in consumer electronics and electric vehicles, as well as for some applications for storage of renewable energy.

More Information

PCT filed on April 4, 2014

Technology Status
Technology IDDevelopment StageAvailabilityPublishedLast Updated
BSA 13-14 PrototypeAvailable03/30/201503/30/2015

Contact BNL About This Technology

To: Avijit Sen<asen@bnl.gov>