US 11,843,105 B2
Electrode surface engineering in lithium ion batteries
Laisuo Su, Pittsburgh, PA (US); and Baby Reeja-Jayan, Pittsburgh, PA (US)
Assigned to CARNEGIE MELLON UNIVERSITY, Pittsburgh, PA (US)
Filed by Carnegie Mellon University, Pittsburgh, PA (US)
Filed on May 29, 2020, as Appl. No. 16/886,948.
Claims priority of provisional application 62/921,054, filed on May 29, 2019.
Prior Publication US 2021/0218028 A1, Jul. 15, 2021
Int. Cl. H01M 4/04 (2006.01); H01M 4/525 (2010.01); H01M 10/0525 (2010.01); H01M 4/505 (2010.01); C23C 16/44 (2006.01); C23C 16/00 (2006.01); H01M 4/36 (2006.01); H01M 4/62 (2006.01); H01M 4/1391 (2010.01)
CPC H01M 4/0471 (2013.01) [C23C 16/00 (2013.01); C23C 16/44 (2013.01); H01M 4/0428 (2013.01); H01M 4/1391 (2013.01); H01M 4/366 (2013.01); H01M 4/505 (2013.01); H01M 4/525 (2013.01); H01M 4/624 (2013.01); H01M 10/0525 (2013.01)] 16 Claims
OG exemplary drawing
 
1. A method to form a coated cathode material, the method comprising:
forming on an exterior surface of LiMn2O4 cathode active material particles, via oxidative chemical vapor deposition, an interfacial coating layer comprising poly(3,4 ethylenedioxythiophene) by (a) heating the LiMn2O4 cathode active material particles to a temperature from 70-130° C., (b) vaporizing 3,4-ethylenedioxythiophene monomer and FeCl3 solid oxidant, and (c) reacting the vaporized 3,4-ethylenedioxythiophene monomer and vaporized solid FeCl3 oxidant to form the interfacial coating layer on the exterior surface of the LiMn2O4 cathode active material particles in an oxidative chemical vapor deposition chamber having a pressure of 50 m Torr and the vaporized 3,4-ethylenedioxythiophene monomer having a flow rate of 1 sccm; and
after forming the interfacial coating layer, rinsing the coated cathode material with an organic solvent to remove impurities from the interfacial layer coating, wherein the organic solvent is selected from the group consisting of methanol, isopropyl alcohol, acetone, and combinations.