Investigation of cycle life of Li–LixV2O5 rechargeable batteries

Moss, Pedro L.; Fu, Riqiang; Au, G.; Plichta, Edward J.; Ye, Xin; Zheng, Jianyi

doi:10.1016/s0378-7753(03)00734-1

Cited by 21 publications

(20 citation statements)

References 16 publications

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“…4 gives the discharge-charge profiles of the V 2 O 5 cathodes obtained by annealing at 500 • C. Plateaus are observed from −0.3 to −0.5 V versus Ag/Ag + . In this voltage discharge interval the Li x V 2 O 5 structure undergoes phase changes, ␣, , and ␦ each with a different x-value of Li intercalation by comparing these plateaus to literature [36]. When cycled between 0.4 and −1.6 V versus Ag/Ag + , the films exhibit high capacities of 250 and 190 mAh/g at current densities of 100 and 200 A/cm 2 , respectively.…”

Section: Resultsmentioning

confidence: 92%

Li+-intercalation electrochemical/electrochromic properties of vanadium pentoxide films by sol electrophoretic deposition

Wang¹,

Cao²

2006

Electrochimica Acta

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Section: Resultsmentioning

confidence: 92%

Li+-intercalation electrochemical/electrochromic properties of vanadium pentoxide films by sol electrophoretic deposition

Wang¹,

Cao²

2006

Electrochimica Acta

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“…(41, 42) The authors noted that the cell resistance was consistently lower for fully charged cells versus discharged cells. The authors also investigated the discharge process by 51 V NMR and reported that the discharge process took place with lithiation of the vanadium oxide and reduction of V 5+ to V 4+ and some amount of V 4+ to V 3+ .…”

Section: Discussionmentioning

confidence: 99%

Electrochemical reduction of silver vanadium phosphorous oxide, Ag2VO2PO4: Silver metal deposition and associated increase in electrical conductivity

Marschilok

Kozarsky

Tanzil

et al. 2010

Journal of Power Sources

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This report details the chemical and associated electrical resistance changes of silver vanadium phosphorous oxide (Ag2VO2PO4, SVPO) incurred during electrochemical reduction in a lithium based electrochemical cell over the range of 0 to 4 electrons per formula unit. Specifically the cathode electrical conductivities and associated cell DC resistance and cell AC impedance values vary with the level of reduction, due the changes of the SVPO cathode. Initially, Ag+ is reduced to Ag0 (2 electrons per formula unit, or 50% of the calculated theoretical value of 4 electrons per formula unit), accompanied by significant decreases in the cathode electrical resistance, consistent with the formation of an electrically conductive silver metal matrix within the SVPO cathode. As Ag+ reduction progresses, V5+ reduction initiates; once the SVPO reduction process progresses to where the reduction of V5+ to V4+ is the dominant process, both the cell and cathode electrical resistances then begin to increase. If the discharge then continues to where the dominant cathode reduction process is the reduction of V4+ to V3+, the cathode and cell electrical resistances then begin to decrease. The complex cathode electrical resistance pattern exhibited during full cell discharge is an important subject of this study.

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“…sulphur 1, 2 , manganese [3][4][5] and vanadate based cathodes [6][7][8], which are otherwise not very stable and safe to be used in liquid organic electrolytes for current Li-ion battery technology 9 . Solid inorganic electrolytes become quite interesting at this point that can enable the use of high capacity electrode materials (e.g.…”

Section: Introductionmentioning

confidence: 99%

A shortcut to garnet-type fast Li-ion conductors for all-solid state batteries

2015

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Ga-doped Li 7 La 3 Zr 2 O 12 garnet structures are among the most promising electrolytes for all solid state Li-ion-batteries. The synthesis and processing of garnet-type fast Li-ion conductors depend on conventional sol-gel and solid state syntheses and sintering that are usually done at temperatures above 1050 °C to reach the high Li-conducting cubic phase. This process results in micron-sized particles and potential Li-loss, which are unfavorable for further processing and electrode-electrolyte assembly. Here, we tackle this problem and report a novel low temperature synthesis-processing route to stabilize the cubic phase of Li 7 La 3 Zr 2 O 12 , while keeping the nanocrystallites at ~ 200-300 nm. Li 7 La 3 Zr 2 O 12 phases are obtained at temperatures of as low as 600 o C by a modified sol-gel combustion method utilizing mainly nitrate precursors, and the sintering temperature is lowered by ~ 200 °C 2 compared to the state-of-art. Through a new model experiment, we also shed light on the conditions influencing the tetragonal to cubic phase transformation via homogeneous Gadiffusion and incorporation occurring at a surprisingly low temperature of ~ 100 o C for a postannealing step. The sintered pellets of newly obtained Li 6.4 Ga 0.2 La 3 Zr 2 O 12 deliver high bulk Li-ion conductivities in the range of ~ 4.0 x 10 -4 S/cm at 20 °C, and a wide thermal operation window is accessible through its characteristic activation energy of ~ 0.32 eV. We report that there is an optimum in sintering-processing conditions for the cubic c-Li 6.4 Ga 0.2 La 3 Zr 2 O 12 solid state electrolytes and their Li-ionic conductivity and the (Raman) near order characteristics that can be tracked through changes in Li-O vibrational modes. Based on this alternative route, low-temperature synthesized powders can be sintered to relatively dense pellets at around only 950 °C. For higher sintering temperatures (e.g. 1100 o C), Li-loss progresses as confirmed by structural studies and a reduction of both, ceramic pellet density and ionic conductivity, as well as distortions in the Li-sublattice are found. Through this work, an alternative low temperature processing route for Ga-doped Li 7 La 3 Zr 2 O 12 garnet type electrolytes for all solid state batteries is suggested. The new synthesis method and the use of c-Li 6.4 Ga 0.2 La 3 Zr 2 O 12 nanoparticles could open pathways in terms of preventing Li-loss during the process and advancing future solid electrolyte-electrode assembly options for all solid state Li-ion batteries.Figure 2. a)In-situ heated XRD powder patterns to study in a model experiment the incorporation of post-added Ga 2 O 3 addition to originally t-Li 7 La 3 Zr 2 O 12 and phase change with respect to temperature (5 °C/min heating rate and annealing 15 minutes at each temperature). Desired fast conducting Li-cubic phase evolves already at temperature as low as 85°C for the post-Ga 2 O 3 addition route; indicating the fast and low-temperature diffusion kinetics of gallium ions to the garnet structure. b) Differential dilatometry...

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Investigation of cycle life of Li–LixV2O5 rechargeable batteries

Cited by 21 publications

References 16 publications

Li+-intercalation electrochemical/electrochromic properties of vanadium pentoxide films by sol electrophoretic deposition

Li+-intercalation electrochemical/electrochromic properties of vanadium pentoxide films by sol electrophoretic deposition

Electrochemical reduction of silver vanadium phosphorous oxide, Ag2VO2PO4: Silver metal deposition and associated increase in electrical conductivity

A shortcut to garnet-type fast Li-ion conductors for all-solid state batteries

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