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- Title
Li<sub>3</sub>PO<sub>4</sub>-Coated LiNi<sub>0.5</sub>Mn<sub>1.5</sub>O<sub>4</sub>: A Stable High-Voltage Cathode Material for Lithium-Ion Batteries.
- Authors
Chong, Jin; Xun, Shidi; Zhang, Jingping; Song, Xiangyun; Xie, Haiming; Battaglia, Vincent; Wang, Rongshun
- Abstract
LiNi0.5Mn1.5O4 is regarded as a promising cathode material to increase the energy density of lithium-ion batteries due to the high discharge voltage (ca. 4.7 V). However, the interface between the LiNi0.5Mn1.5O4 cathode and the electrolyte is a great concern because of the decomposition of the electrolyte on the cathode surface at high operational potentials. To build a stable and functional protecting layer of Li3PO4 on LiNi0.5Mn1.5O4 to avoid direct contact between the active materials and the electrolyte is the emphasis of this study. Li3PO4-coated LiNi0.5Mn1.5O4 is prepared by a solid-state reaction and noncoated LiNi0.5Mn1.5O4 is prepared by the same method as a control. The materials are fully characterized by XRD, FT-IR, and high-resolution TEM. TEM shows that the Li3PO4 layer (<6 nm) is successfully coated on the LiNi0.5Mn1.5O4 primary particles. XRD and FT-IR reveal that the synthesized Li3PO4-coated LiNi0.5Mn1.5O4 has a cubic spinel structure with a space group of Fd $\bar 3$ m, whereas noncoated LiNi0.5Mn1.5O4 shows a cubic spinel structure with a space group of P4332. The electrochemical performance of the prepared materials is characterized in half and full cells. Li3PO4-coated LiNi0.5Mn1.5O4 shows dramatically enhanced cycling performance compared with noncoated LiNi0.5Mn1.5O4.
- Subjects
PERFORMANCE of cathodes; ELECTROCHEMICAL electrodes; HIGH-voltage direct current transmission; LITHIUM-ion batteries; ELECTROCHEMICAL analysis
- Publication
Chemistry - A European Journal, 2014, Vol 20, Issue 24, p7479
- ISSN
0947-6539
- Publication type
Article
- DOI
10.1002/chem.201304744