Synthesis, crystal structure, and electrode characteristics of LiMnPO{sub 4}(OH) cathode for lithium batteries

Journal Article · Thu Mar 15 04:00:00 EDT 2012 · Journal of Solid State Chemistry

DOI:https://doi.org/10.1016/J.JSSC.2011.12.023· OSTI ID:22012049

Yang, Yang ^[1]; Hirayama, Masaaki ^[1]; Yonemura, Masao ^[2]; Kanno, Ryoji ^[1]

---

1. Department of Electronic Chemistry, Interdisciplinary Graduate School of Science and Engineering, Tokyo Institute of Technology, 4259 Nagatsuta, Midori-ku, Yokohama 226-8502 (Japan)
2. KEK, Tokai, Ibaraki 319-1195 (Japan)

The electrochemical properties of lithium manganese hydroxyphosphate, LiMnPO{sub 4}(OH), with the tavorite structure have been investigated to assess its suitability as a cathode material for lithium batteries. Stoichiometric LiMnPO{sub 4}(OH) was synthesized by an ion-exchange reaction with MnPO{sub 4}{center_dot}H{sub 2}O and LiNO{sub 3}. Lithium (de)intercalation reaction was observed for the first time in the trivalent LiMnPO{sub 4}(OH), and it exhibited a reversible capacity of 110 mA h g{sup -1} with an average cell voltage of 3.4 V (vs. Li) after an irreversible phase change during the first charge process. The crystal structure has been refined at room temperature by neutron and synchrotron X-ray diffraction data using Rietveld method with a space group of P-1. The hydroxy group at a bottleneck may reduce the attraction force between lithium and the bottleneck oxygen ions that thus increase the ion mobility along the lithium diffusion tunnel. - Graphical abstract: Tavorite-type material LiMnPO{sub 4}(OH) shows lithium intercalation at an average voltage of 3.4 V (vs. Li) after a phase transition during the first charge-discharge. Highlights: Black-Right-Pointing-Pointer Tavorite-type LiMnPO{sub 4}(OH) nanoparticles as a cathode material for lithium battery. Black-Right-Pointing-Pointer Synchrotron XRD and neutron diffraction refinement of LiMnPO{sub 4}(OH). Black-Right-Pointing-Pointer Lithium intercalation reaction occurs in LiMnPO{sub 4}(OH) during charge-discharge. Black-Right-Pointing-Pointer A phase transition in the first charge, followed by a reversible reaction.

• OSTI ID: 22012049
• Journal Information: Journal of Solid State Chemistry, Journal Name: Journal of Solid State Chemistry Vol. . 187; ISSN 0022-4596; ISSN JSSCBI
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
CATHODES
CRYSTAL STRUCTURE
ION MOBILITY
LITHIUM
MANGANESE
NANOSTRUCTURES
NEUTRON DIFFRACTION
NEUTRONS
SYNCHROTRONS
SYNTHESIS
X-RAY DIFFRACTION