New High Capacity Cathode Materials for Rechargeable Li-ion Batteries: Vanadate-Borate Glasses

Afyon, Semih; Krumeich, Frank; Mensing, Christian; Borgschulte, Andreas; Nesper, Reinhard

doi:10.1038/srep07113

Cited by 129 publications

(58 citation statements)

References 35 publications

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“…14,[18][19][20] Variation and modification of V2O5 have led to new opportunities to optimize the electrochemical properties. Interestingly, the characteristic lithiation plateau for crystalline orthorhombic V2O5 was not observed for amorphous V2O5, 21,22 graphene sheets and carbon nanotubes modified V2O5 23,24 and hydrated V2O5. 25,26 Meanwhile, enhanced cycling stability and reversible capacity have been achieved.…”

Section: Introductionmentioning

confidence: 98%

Lithiation-driven structural transition of VO₂F into disordered rock-salt Li_xVO₂F

et al. 2016

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We synthesize a new vanadium oxyfluoride VO2F (rhombohedral, R3,¯ c) through a simple one-step ball-milling route and demonstrate its promising lithium storage properties with a high theoretical capacity of 526 mAh g -1 . Similar to V2O5, VO2F transfers into active disordered rock-salt (Fm3,¯ m) phase after initial cycling against lithium anode, as confirmed by diffraction and spectroscopic experiments. The newly formed nanosized LixVO2F remains its crystal structure over further cycling between 4.1 and 1.3 V. A high capacity of 350 mAh g -1 at 2.5 V was observed at 25°C and 50 mA g -1 . Furthermore, superior performance was observed for VO2F in comparison with a commercial crystalline V2O5, in terms of discharge voltage, voltage hysteresis and reversible capacity.

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Section: Introductionmentioning

confidence: 98%

Lithiation-driven structural transition of VO₂F into disordered rock-salt Li_xVO₂F

et al. 2016

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“…Two approaches for improving the energy and power densities of lithium-ion batteries are frequently proposed: either the discharge capacity of the cathode could be enhanced [3,4], or the working potential of the cathode materials could be increased [5][6][7]. In this scenario, LiFePO 4 and related materials with olivine-like structures are widely applied to build cathodes for rechargeable lithium-ion batteries as a viable alternative to the commonly-used transition metal oxides (LiCo 2 , LiNiO 2 , LiMn 2 O 4 ).…”

Section: Introductionmentioning

confidence: 99%

Doping LiMnPO4 with Cobalt and Nickel: A First Principle Study

et al. 2017

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Abstract:A density functional theory (DFT) study has been carried out on transition metal phosphates with olivine structure and formula LiMPO 4 (M = Fe, Mn, Co, Ni) to assess their potential as cathode materials in rechargeable Li-ion batteries based on their chemical and structural stability and high theoretical capacity. The investigation focuses on LiMnPO 4 , which could offer an improved cell potential (4.1 V) with respect to the reference LiFePO 4 compound, but it is characterized by poor lithium intercalation/de-intercalation kinetics. Substitution of cations like Co and Ni in the olivine structure of LiMnPO 4 was recently reported in an attempt to improve the electrochemical performances. Here the electronic structure and lithium intercalation potential of Ni-and Co-doped LiMnPO 4 were calculated in the framework of the Hubbard U density functional theory (DFT+U) method for highly correlated materials. Moreover, the diffusion process of lithium in the host structures was simulated, and the activation barriers in the doped and pristine structures were compared. Our calculation predicted that doping increases Li insertion potential while activation barriers for Li diffusion remain similar to the pristine material. Moreover, Ni and Co doping induces the formation of impurity states near the Fermi level and significantly reduces the band gap of LiMnPO 4 .

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“…[ 3 ] Solid electrolytes offer many advantages and could enable the use of new high capacity electrode materials such as sulfur, [ 4 ] manganese, [5][6][7] and vanadate [ 8,9 ] -based cathodes which may not be stable and safe in the current Li-ion battery technology based on liquid electrolytes. [ 10 ] Furthermore, solid electrolytes have the promise to use directly metallic lithium anodes, i.e., preventing dendritic lithium growth, which enables even higher energy densities.…”

mentioning

confidence: 99%

Interface‐Engineered All‐Solid‐State Li‐Ion Batteries Based on Garnet‐Type Fast Li⁺ Conductors

Broek

Afyon

Rupp

2016

Advanced Energy Materials

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291

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with solid electrolytes. [ 3 ] Solid electrolytes offer many advantages and could enable the use of new high capacity electrode materials such as sulfur, [ 4 ] manganese, [5][6][7] and vanadate [ 8,9 ] -based cathodes which may not be stable and safe in the current Li-ion battery technology based on liquid electrolytes. [ 10 ] Furthermore, solid electrolytes have the promise to use directly metallic lithium anodes, i.e., preventing dendritic lithium growth, which enables even higher energy densities. From a practical point of view, one may also highlight that solid electrolytes have much-improved thermal operation windows resulting in a higher chemical and thermal stability, benefi ting the long-term operation and safety when compared to their liquid counterparts. This allows for safe packaging of the cell geometries and enables miniaturized cell architectures while simultaneously reducing the battery weight. [ 11,12 ] Among the oxide solid Li-ionic electrolytes, Li 7 La 3 Zr 2 O 12 (LLZO) garnets and their doped variants show one of the highest Li-ion conductivities in the range of ≈10 −4 S cm −1 at room temperature. [ 13 ] LLZO was fi rst synthesized and characterized in 2007 by Murugan et al. [ 14 ] Not until a few years later Geiger et al. [ 15 ] showed that LLZO appears in two different crystal structures, a cubic and a tetragonal one, with the cubic phase showing a Li-ion conductivity two orders of magnitude higher than the tetragonal phase. Using doping strategies, i.e., by introducing Al 3+ , Ga 3+ , Ta 5+ , Nb 5+ , etc., the high conductive cubic phase can be stabilized at room temperature by introducing vacancies into the Li sublattice of the structures. [16][17][18][19] One of the most commonly used dopants is Al 3+ , which stabilizes the cubic phase by substituting for three Li + , thereby creating two Li vacancies and resulting in the stoichiometry of Li 7−3 x Al x La 3 Zr 2 O 12 for the cubic phase.[ 20 ] Despite the promises, all-solid-state Li-ion batteries based on cubic LLZO solid electrolytes have still challenges in realizing high practical performances due to their high electrode-electrolyte interfacial resistances. For the investigations on all-solid-state batteries based on garnet-type cubic LLZO, most of the current research efforts are concentrated on the cathode material, most prominently on LiCoO 2 . [21][22][23][24][25][26][27] Reasonable electrochemical activities are so far only achieved by vacuum deposition of the cathode as thin fi lms, i.e., by pulsed laser deposition (PLD), because of the resulting good electrolyte-electrode contact. [ 25,26 ] Here, the exact chemical composition of the electrolyte-electrode interface also greatly determines the contact properties, the interfacial

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New High Capacity Cathode Materials for Rechargeable Li-ion Batteries: Vanadate-Borate Glasses

Cited by 129 publications

References 35 publications

Lithiation-driven structural transition of VO₂F into disordered rock-salt Li_xVO₂F

Lithiation-driven structural transition of VO₂F into disordered rock-salt Li_xVO₂F

Doping LiMnPO4 with Cobalt and Nickel: A First Principle Study

Interface‐Engineered All‐Solid‐State Li‐Ion Batteries Based on Garnet‐Type Fast Li⁺ Conductors

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New High Capacity Cathode Materials for Rechargeable Li-ion Batteries: Vanadate-Borate Glasses

Cited by 129 publications

References 35 publications

Lithiation-driven structural transition of VO2F into disordered rock-salt LixVO2F

Lithiation-driven structural transition of VO2F into disordered rock-salt LixVO2F

Doping LiMnPO4 with Cobalt and Nickel: A First Principle Study

Interface‐Engineered All‐Solid‐State Li‐Ion Batteries Based on Garnet‐Type Fast Li+ Conductors

Contact Info

Product

Resources

About

Lithiation-driven structural transition of VO₂F into disordered rock-salt Li_xVO₂F

Lithiation-driven structural transition of VO₂F into disordered rock-salt Li_xVO₂F

Interface‐Engineered All‐Solid‐State Li‐Ion Batteries Based on Garnet‐Type Fast Li⁺ Conductors