A thermodynamic investigation on the substitution mechanism of Mg-doped lithium vanadium phosphate

Beutl, Alexander; Cupid, Damian M.

doi:10.1016/j.electacta.2019.04.029

Cited by 4 publications

(1 citation statement)

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“…The traditional design concept of doping is to control the initial raw materials ratio. It is widely believed that low-valence dopants (such as Na + , ) substitute lithium ions and high-valence dopants (such as Co 2+ , Mg 2+ , − Mn 2+ , Ni 2+ , , Fe 3+ , Al 3+ , , Ce 3+ , Cr 3+ , and Ti 4+ ,, ) are doped at the V sites of LVP. Ti 4+ and V 3+ have similar ionic radii, which makes Ti 4+ an ideal candidate for V 3+ substitution.…”

Section: Introductionmentioning

confidence: 99%

Unraveling the Relationship between Ti⁴⁺ Doping and Li⁺ Mobility Enhancement in Ti⁴⁺ Doped Li₃V₂(PO₄)₃

Wang

Huo

Lin

et al. 2019

ACS Appl. Energy Mater.

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The electrochemical properties of Li3V2(PO4)3 (LVP) cathode of lithium ion batteries are often improved by ion doping. Nevertheless, the mechanism of ion doping has not been fully understood. Here, Ti4+ has been chosen as a typical dopant with similar atomic radius to the six-coordinated V3+. A series of Li3Ti x V(2–x)(PO4)3/C samples are successfully synthesized by a sol–gel route. The 7Li MAS NMR spectra of the LT x VP/C demonstrate that the doping of Ti4+ can enhance the mobility of Li ions. The results of electrochemical properties tests show that moderate Ti4+ doping is able to improve the high rate capability of the materials by increasing the electronic conductivity and Li-ion diffusion coefficient. The optimal sample (LT0.08VP/C) exhibits the best cycling behavior and rate capability, which can deliver 110.85 mAh/g and capacity retention of 99.36% at 10 C after 100 cycles. Electrochemical impedance spectroscopy results indicate that LT0.08VP/C possesses the minimum charge transfer resistance. The calculation results of cyclic voltammetry illustrate that the Li-ion diffusion coefficient of LT0.08VP/C has been improved. By combining the information extracted from a series of electrochemical characterizations and NMR tests, a structural model of Li+ vacancy is proposed to explain the improving of Li+ mobility.

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Section: Introductionmentioning

confidence: 99%

Unraveling the Relationship between Ti⁴⁺ Doping and Li⁺ Mobility Enhancement in Ti⁴⁺ Doped Li₃V₂(PO₄)₃

Wang

Huo

Lin

et al. 2019

ACS Appl. Energy Mater.

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Sc3+-doping effects on porous Li3V2(PO4)3/C cathode with superior rate performance and cyclic stability

Tong

et al. 2021

Ceramics International

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Development of a co-precipitation process for the preparation of magnesium hydroxide containing lithium carbonate from Li-enriched brines

et al. 2020

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A thermodynamic investigation on the substitution mechanism of Mg-doped lithium vanadium phosphate

Cited by 4 publications

References 57 publications

Unraveling the Relationship between Ti⁴⁺ Doping and Li⁺ Mobility Enhancement in Ti⁴⁺ Doped Li₃V₂(PO₄)₃

Unraveling the Relationship between Ti⁴⁺ Doping and Li⁺ Mobility Enhancement in Ti⁴⁺ Doped Li₃V₂(PO₄)₃

Sc3+-doping effects on porous Li3V2(PO4)3/C cathode with superior rate performance and cyclic stability

Development of a co-precipitation process for the preparation of magnesium hydroxide containing lithium carbonate from Li-enriched brines

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A thermodynamic investigation on the substitution mechanism of Mg-doped lithium vanadium phosphate

Cited by 4 publications

References 57 publications

Unraveling the Relationship between Ti4+ Doping and Li+ Mobility Enhancement in Ti4+ Doped Li3V2(PO4)3

Unraveling the Relationship between Ti4+ Doping and Li+ Mobility Enhancement in Ti4+ Doped Li3V2(PO4)3

Sc3+-doping effects on porous Li3V2(PO4)3/C cathode with superior rate performance and cyclic stability

Development of a co-precipitation process for the preparation of magnesium hydroxide containing lithium carbonate from Li-enriched brines

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Product

Resources

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Unraveling the Relationship between Ti⁴⁺ Doping and Li⁺ Mobility Enhancement in Ti⁴⁺ Doped Li₃V₂(PO₄)₃

Unraveling the Relationship between Ti⁴⁺ Doping and Li⁺ Mobility Enhancement in Ti⁴⁺ Doped Li₃V₂(PO₄)₃