Publications de Nam Hee Kwon | EPFL Graph Search

Characteristics and properties of nano-LiCoO2 synthesized by pre-organized single source precursors: Li-ion diffusivity, electrochemistry and biological assessment

Andreas Züttel, Mariana Spodaryk, Nam Hee Kwon

Background: LiCoO2 is one of the most used cathode materials in Li-ion batteries. Its conventional synthesis requires high temperature (>800 degrees C) and long heating time (>24 h) to obtain the micronscale rhombohedral layered high-temperature phase of L ...

2017

Improving the Electrochemical Activity of LiMnPO4 Via Mn-Site Substitution

Michael Graetzel, Mingkui Wang, Nam Hee Kwon

HPL SA report the modification of the electrochemical performance of lithium manganese phosphate (LiMnPO4) via Mn-site bivalent substitution. Manganese (10%) is substituted with iron, nickel, magnesium, or zinc. These substituents are shown via an X-ray to ...

2010

High-performance, nano-structured LiMnPO4 synthesized via a polyol method

Michael Graetzel, Nam Hee Kwon, Gianluca Deghenghi

A novel polyol synthesis was adopted to synthesize nano-structured LiMnPO4. This route yields well-crystallized nanoparticles with platelet morphology that are only similar to 30 nm thick oriented in the b direction. The obtained material presented a good ...

Elsevier2009

Effect of particle size on LiMnPO4 cathodes

Paul Bowen, Nam Hee Kwon

LiMnPO4 was synthesized using a sol–gel method and tested as a cathode material for lithium ion batteries. After calcination at temperatures between 520 and 600 ◦C, primary particle sizes in the range of 140–220 nm were achieved. Subsequent dry ball millin ...

2007

Mesoscopic manganese based cathode materials for high voltage lithium ion batteries

Nam Hee Kwon

Alternative cathode materials were investigated for application to high voltage lithium ion batteries. Manganese based materials were considered due to the low cost and environmentally sustainable impact. Layer-structured oxide and phospho-olivine material ...

EPFL2006