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α-TiPO 4 as a Negative Electrode Material for Lithium-Ion Batteries.
- Source :
-
Inorganic chemistry [Inorg Chem] 2021 Aug 16; Vol. 60 (16), pp. 12237-12246. Date of Electronic Publication: 2021 Aug 05. - Publication Year :
- 2021
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Abstract
- To realize high-power performance, lithium-ion batteries require stable, environmentally benign, and economically viable noncarbonaceous anode materials capable of operating at high rates with low strain during charge-discharge. In this paper, we report the synthesis, crystal structure, and electrochemical properties of a new titanium-based member of the MPO <subscript>4</subscript> phosphate series adopting the α-CrPO <subscript>4</subscript> structure type. α-TiPO <subscript>4</subscript> has been obtained by thermal decomposition of a novel hydrothermally prepared fluoride phosphate, NH <subscript>4</subscript> TiPO <subscript>4</subscript> F, at 600 °C under a hydrogen atmosphere. The crystal structure of α-TiPO <subscript>4</subscript> is refined from powder X-ray diffraction data using a Rietveld method and verified by electron diffraction and high-resolution scanning transmission electron microscopy, whereas the chemical composition is confirmed by IR, energy-dispersive X-ray, electron paramagnetic resonance, and electron energy loss spectroscopies. Carbon-coated α-TiPO <subscript>4</subscript> /C demonstrates reversible electrochemical activity ascribed to the Ti <superscript>3+</superscript> /Ti <superscript>2+</superscript> redox transition delivering 125 mAh g <superscript>-1</superscript> specific capacity at C/10 in the 1.0-3.1 V versus Li <superscript>+</superscript> /Li potential range with an average potential of ∼1.5 V, exhibiting good rate capability and stable cycling with volume variation not exceeding 0.5%. Below 0.8 V, the material undergoes a conversion reaction, further revealing capacitive reversible electrochemical behavior with an average specific capacity of 270 mAh g <superscript>-1</superscript> at 1C in the 0.7-2.9 V versus Li <superscript>+</superscript> /Li potential range. This work suggests a new synthesis route to metastable titanium-containing phosphates holding prospective to be used as negative electrode materials for metal-ion batteries.
Details
- Language :
- English
- ISSN :
- 1520-510X
- Volume :
- 60
- Issue :
- 16
- Database :
- MEDLINE
- Journal :
- Inorganic chemistry
- Publication Type :
- Academic Journal
- Accession number :
- 34351137
- Full Text :
- https://doi.org/10.1021/acs.inorgchem.1c01420