3 V manganese oxide electrode materials for lithium batteries. Page: 4 of 20
This article is part of the collection entitled: Office of Scientific & Technical Information Technical Reports and was provided to Digital Library by the UNT Libraries Government Documents Department.
The following text was automatically extracted from the image on this page using optical character recognition software:
3 V Manganese Oxide Electrode Materials for Lithium Batteries
C. S. Johnson* and M. M. Thackeray,
Electrochemical Technology Program,
Chemical Technology Division,
Argonne National Laboratory
Argonne, Illinois 60439, USA
Specific discharge capacities in excess of 200 mAh/g and good reversible cycling behavior
between 3.8 and 2.0 V has been observed in a lithium cell for a-MnO2 phases with the hollandite
structure. A combination of lithia (Li2O) doping and ammonia (NH3) treatment of the active
material powder having the composition a-[0.143 Li201 "[0.007 NH3] 'MnO2 gave the best
electrochemical performance in liquid organic electrolyte (1:1 EC:DMC, 1 M LiPF6) coin cells,
with metallic Li as the negative electrode. The added lithia forms a defect close-packed array of
oxide anions and stabilizes the interior of the 2x2 tunnel of the hollandite structure by partially
filling the crystallographic position (0,0,0.5) of the tetragonal unit cell (I4/m) with 02, from the
added Li20. Ammonia treatment is hypothesized to partially fill other lattice vacancies still
available within the 2x2 tunnel with the nitrogen atoms from NH3 taking the same position as
the oxide anion in the array. The NH3 can further stabilize the cell during lithium
insertion/extraction because of its favorable hydrogen bonding ability and Lewis base
Here’s what’s next.
This article can be searched. Note: Results may vary based on the legibility of text within the document.
Tools / Downloads
Get a copy of this page or view the extracted text.
Citing and Sharing
Basic information for referencing this web page. We also provide extended guidance on usage rights, references, copying or embedding.
Reference the current page of this Article.
Johnson, C. S. & Thackeray, M. M. 3 V manganese oxide electrode materials for lithium batteries., article, June 20, 2000; Illinois. (digital.library.unt.edu/ark:/67531/metadc711713/m1/4/: accessed October 17, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.