Structure and conductivity of an Li4SiO4–Li2SO4solid solution phase

Dissanayake, M.A.K.L.; West, Anthony R.

doi:10.1039/jm9910101023

Cited by 18 publications

(9 citation statements)

References 17 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The poor conduction nature of Li 4 SiO 4 might be due to all the lithium atoms locating in an ordered manner . Isovalent substitution of Si 4+ can only lead to minor improvement on the conductivity, while on the other hand, aliovalent substitution of either Li + or Si 4+ can enhance the conductivity by more than three orders of magnitude to 10 −6 –10 −5 S/cm . Interestingly, the high conductivity values for aliovalent substitution of Si 4+ are normally achieved at the doping level near 50% irrespective of the final structure, suggesting that the enhancement is mainly associated with the creation of lithium vacancies or interstitials.…”

Section: Other Type Electrolytesmentioning

confidence: 99%

Oxide Electrolytes for Lithium Batteries

et al. 2015

View full text Add to dashboard Cite

As the most promising candidate of the solid electrolyte materials for future lithium batteries, oxide electrolytes with highlithium-ion conductivity have experienced a rapid development in the past few decades. Existing oxide electrolytes are divided into two groups, i.e., crystalline group including NASICON, perovskite, garnet, and some newly developing structures, and amorphous/glass group including Li 2 O-MO x (M = Si, B, P, etc.) and LiPON-related materials. After a historical perspective on the general development of oxide electrolytes, we try to give a comprehensive review on the oxide electrolytes with high-lithium-ion conductivity, with special emphasis on the aspect of materials selection and design for applications as solid electrolytes in lithium batteries. Some successful examples and meaningful attempts on the incorporation of oxide electrolytes in lithium batteries are also presented. In the conclusion part, an outlook for the future direction of oxide electrolytes development is given.

show abstract

Section: Other Type Electrolytesmentioning

confidence: 99%

Oxide Electrolytes for Lithium Batteries

et al. 2015

View full text Add to dashboard Cite

show abstract

“…1,2 Due to their low chemical reactivity with water and excellent compatibility with other materials, lithium ceramics are the best option for tritium production and release through the 6 Li + n t → 3 T + 4 He reaction, which determines the possible application of a tritium breeder material into the fusion reactors. [3][4][5][6][7][8] In recent decades, another possible application for lithium silicates has been found: as CO 2 sorbents to fight global warming.…”

Section: Introductionmentioning

confidence: 99%

Density functional theory study of the structural, electronic, lattice dynamical, and thermodynamic properties of Li4SiO4and its capability for CO
Duan
¹
,
Parliński
²

2011
Phys. Rev. B
65
4
56
0
View full text Add to dashboard Cite

The structural, electronic, lattice dynamical, optical, thermodynamic, and CO 2 capture properties of monoclinic and triclinic phases of Li 4 SiO 4 are investigated by combining density functional theory with phonon lattice dynamics calculations. We found that these two phases have some similarities in their bulk and thermodynamic properties. The calculated bulk modulus and the cohesive energies of these two phases are close to each other. Although both of them are insulators, the monoclinic phase of Li 4 SiO 4 has a direct band gap of 5.24 eV while the triclinic Li 4 SiO 4 phase has an indirect band gap of 4.98 eV. In both phases of Li 4 SiO 4 , the s orbital of O mainly contributes to the lower-energy second valence band (VB 2 ) and the p orbitals contribute to the fist valence band (VB 1 ) and the conduction bands (CBs). The s orbital of Si mainly contributes to the lower portions of the VB 1 and VB 2 , and Si p orbitals mainly contribute to the higher portions of the VB 1 and VB 2 . The s and p orbitals of Li contribute to both VBs and to CBs, and Li p orbitals have a higher contribution than the Li s orbital. There is possibly a phonon soft mode existing in triclinic γ -Li 4 SiO 4 ; in the monoclinic Li 4 SiO 4 , there are three phonon soft modes, which correspond to the one type of Li disordered over a few sites. Their LO-TO splitting indicates that both phases of Li 4 SiO 4 are polar anisotropic materials. The calculated infrared absorption spectra for LO and TO modes are different for these two phases of Li 4 SiO 4 . The calculated relationships of the chemical potential versus temperature and CO 2 pressure for reaction of Li 4 SiO 4 with CO 2 shows that Li 4 SiO 4 could be a good candidate for a high-temperature CO 2 sorbent while used for postcombustion capture technology.

show abstract

“…However, in the subsequent cycles this reduction peak divided into multiple peaks at 0.2–0.5 V. Corresponding to these reduction peaks, a series of oxidation peaks at 0.5–0.9 V were observed during the anodic scans, representing the lithiation/delithiation processes of LiSn (0.65, 0.80 V), Li 7 Sn 3 (0.40, 0.73 V), Li 7 Sn 2 (0.33, 0.62 V), and Li 22 Sn 5 (0.22, 0.54 V) . These multiple peaks strongly support an improved reversibility of the lithiation/delithiation of Li–Sn alloys promoted by the porous carbon matrix, which improved electronic conductivity and provided void space for shortening the diffusion path of Li + . Additionally, a weak oxidation peak was found at ≈1.9 V in both SnO x @C and Si y Sn 1– y O x @C. This was not observed in SnO x NP, and was related to the formation of SnO 2 .…”

Section: Resultsmentioning

confidence: 99%

Novel Silicon Doped Tin Oxide–Carbon Microspheres as Anode Material for Lithium Ion Batteries: The Multiple Effects Exerted by Doped Si

Tan

Wong

2017

Small

View full text Add to dashboard Cite

Silicon doped tin oxide embedded porous carbon microspheres (Si Sn O @C) are synthesized. It is found that the doped Si not only improves the reversibility of lithiation/delithiation reactions, but also prevents Sn from aggregation. In addition, the doped Si introduces extra defects into the carbon matrix and produces Li conductive Li SiO , which accelerates Li diffusion. Together with the conductive, porous carbon matrix that provides void space to accommodate the volume change of Sn during charge/discharge cycling, the novel Si Sn O @C exhibits excellent electrochemical performance. It shows a high initial columbic efficiency of 75.9%. A charge (delithiation) capacity of 880.32 mA h g is retained after 150 cycles, i.e., 91% of the initial capacity. These results indicate that the as-synthesized Si Sn O @C is a promising anode material for lithium ion batteries.

show abstract

Structure and conductivity of an Li₄SiO₄–Li₂SO₄solid solution phase

Cited by 18 publications

References 17 publications

Oxide Electrolytes for Lithium Batteries

Oxide Electrolytes for Lithium Batteries

Density functional theory study of the structural, electronic, lattice dynamical, and thermodynamic properties of Li4SiO4and its capability for CO
Duan
¹
,
Parliński
²

2011
Phys. Rev. B
65
4
56
0
View full text Add to dashboard Cite

Novel Silicon Doped Tin Oxide–Carbon Microspheres as Anode Material for Lithium Ion Batteries: The Multiple Effects Exerted by Doped Si

Contact Info

Product

Resources

About

Structure and conductivity of an Li4SiO4–Li2SO4solid solution phase

Cited by 18 publications

References 17 publications

Oxide Electrolytes for Lithium Batteries

Oxide Electrolytes for Lithium Batteries

Density functional theory study of the structural, electronic, lattice dynamical, and thermodynamic properties of Li4SiO4and its capability for CODuan1, Parliński2 2011Phys. Rev. B654560View full textAdd to dashboardCite

Novel Silicon Doped Tin Oxide–Carbon Microspheres as Anode Material for Lithium Ion Batteries: The Multiple Effects Exerted by Doped Si

Contact Info

Product

Resources

About

Structure and conductivity of an Li₄SiO₄–Li₂SO₄solid solution phase

Density functional theory study of the structural, electronic, lattice dynamical, and thermodynamic properties of Li4SiO4and its capability for CO
Duan
¹
,
Parliński
²

2011
Phys. Rev. B
65
4
56
0
View full text Add to dashboard Cite