Crystal and Magnetic Structures of Layer Transition Metal Phosphate Hydrates

Precursor-based synthesis and electrochemical performance of LiMnPO4

“…All reflections can be indexed based on the orthorhombic unit cell Pmn2 1 (a = 5.7269(2), b = 8.8143(5), c = 4.9059(2)Å). The Rietveld refinement for NH 4 MnPO 4 ·H 2 O was started with the model parameters from the isostructural compound NH 4 CoPO 4 ·H 2 O [12,13]. Using these model parameters, we obtained a strong difference in the intensity ratio between observed and calculated diffraction patterns.…”

“…The precipitation of NH 4 MnPO 4 ·H 2 O was initially conducted as described [12] by dropping of 0.5 M MnCl 2 to the saturated solution of (NH 4 ) 2 HPO 4 under constant stirring at 80 • C. The conditions of the precipitation (pH, concentration of the reactants) were varied. To perform the precipitation at different pH values the saturated solution of NH 4 H 2 PO 4 was prepared and adjusted to the desirable pH by the adding of 25%-ammonia (Merck, Germany).…”

Morphology and Agglomeration Control of LiMnPO4 Micro- and Nanocrystals

“…24 However, the XRD patterns of the samples prepared at pH 5.5 and 11 show a high background, which points to the presence of amorphous phases. The sample prepared at pH 9 exhibits sharp peaks and a low background which is characteristic for a good crystallinity.…”

Hierarchical Carbon‐Coated LiFePO4 Nanoplate Microspheres with High Electrochemical Performance for Li‐Ion Batteries

“…The ammonia molecules can passivate the surface of primary (NH 4 ) x FePO 4 nanocrystal planes and provide a weak driving force for further aggregating into nanoplates. [25][26][27] In addition, the H-bonds in NH 3 (N − H · · · O) molecules act a key role in linking these nanoplates, [ 21 ] and fi nally hierarchical (NH 4 ) x FePO 4 NMs is formed.…”