High Power Battery Electrodes Using Nanoporous V<sub>2</sub>O<sub>5</sub>/Carbon Composites

Yamada, Hirotoshi; Tagawa, Koichi; Komatsu, Masaharu; Moriguchi, Isamu; Kudo, Tetsuichi

doi:10.1021/jp071806p

Cited by 79 publications

(69 citation statements)

References 17 publications

(42 reference statements)

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“…That is, a few lithium ions were inserted from LSO into FPO on their contact interfaces and conduct charges in FPO. This is supported by the fact that the observed activation energy of 0.63 eV is close to that for LiFePO 4 , 0.55-0.59 eV. 30 This local reaction between LSO and FPO is not surprising, although LSO is electrochemically stable at this potential of 3.5 V vs. Li/Li + .…”

Section: Sio 3 -Fepomentioning

confidence: 81%

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Local Structure and Ionic Conduction at Interfaces of Electrode and Solid Electrolytes

Yamada

Oga

Saruwatari

et al. 2012

J. Electrochem. Soc.

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. Studies on ionic conductivity of these composites revealed lithium ion transfer across the interfaces without electric field, which depended on electrode potentials. For Li 2 SiO 3 -TiO 2 , conductivity of the composites was enhanced by addition of TiO 2 and well explained by space charge layer model. With LiTiO 2 which shows lower electrode potential, the conductivity was deteriorated due to decrease in vacancies in Li 2 SiO 3 . At the interface of Li 2 SiO 3 -FePO 4 , a lot of Li ions in Li 2 SiO 3 are trapped at the interface or maybe are inserted into FePO 4 , resulting in many vacancies in Li 2 SiO 3 and lattice distortion. The results show the ionic conduction at the interface is strongly affected by the electrode potential and the importance of design of interfaces of all solid state batteries is pointed out. Lithium ion batteries (LIBs) are widely used as rechargeable batteries for portable electronic devices due to their large energy densities among currently available energy storage devices. The development of LIBs is now toward an application to large-scaled devices, such as electric vehicles and load leveling of renewable energies. [1][2][3][4][5][6] In this context, all solid state batteries employing inorganic solid electrolytes are attracting many interests because non-flammability and non-volatility of inorganic solid electrolytes enhances safety and reliability of batteries, which may be of importance for large-scaled devices. [7][8][9] In addition, metallic lithium may be used as negative electrodes of all solid state batteries because the dense solid electrolytes protect unfavorable dendritic lithium deposition on negative electrodes, which can happens for conventional LIBs with liquid electrolytes.10 Although poor lithium ionic conductivity of solid electrolytes have been mentioned as a drawback of all solid state batteries, several solid electrolytes with ionic conductivities higher than 10 −4 S cm −1 have been developed. [11][12][13][14][15][16] Recently, very high Li + conductivity of 10 −2 S cm −1 at room temperature is reported for Li 10 GeP 2 S 12 , 17 and the problem on the poor conductivity seems to be rather improved. The other point to be taken into consideration for practical use of all solid state batteries would be the interface resistance between electrolytes and electrodes. The solid electrolytes don't show fluidity and thus it is difficult to prepare good contact at interfaces where electrochemical reactions take place. What is more, recently, interfacial resistance due to the other reasons has been reported by several researchers, which could be reduced by preparing buffer layers at the interface. [18][19][20][21][22] There have been three models proposed as the origin of the interfacial resistance. The first proposed mechanism is the formation of space charge layer at the interface inside the solid electrolytes in which lithium ion concentration is reduced and the ionic conductivity of the solid electrolytes is decreased. 18, 19The second model is that the interfacial chem...

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Section: Sio 3 -Fepomentioning

confidence: 81%

“…5a). 4 nano-composite.-To study composites with higher electrode potential, FePO 4 (FPO) with a potential of 3.5 V vs. Li/Li + was used as an active material, because valence of Ti in TiO 2 is +4 and TiO 2 cannot be further oxidized and higher potential than 3.3 V vs. Li/Li…”

Section: Sio 3 -Litio 2 Nano-composite-to Confirm the Above Modmentioning

confidence: 99%

Local Structure and Ionic Conduction at Interfaces of Electrode and Solid Electrolytes

Yamada

Oga

Saruwatari

et al. 2012

J. Electrochem. Soc.

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“…efficient energy consumption and effective usage of renewable energies. Lithium ion batteries (LIBs) and related batteries are supposed to be one of promising energy storage devices [1][2][3][4][5][6]. LIBs used for those purpose would be much larger than conventional LIBs, and all solid state batteries that employ solid electrolytes (especially inorganic ceramics electrolytes) attract interests because of their advantages that are hardly achieved by conventional batteries with liquid organic electrolytes [7][8][9].…”

Section: Introductionmentioning

confidence: 99%

Interfacial phenomena between lithium ion conductors and cathodes

et al. 2014

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Nanocomposites of a lithium ion conductor Li1.3Al0.3Ti1.7(PO4)3 and electrode materials (TiO2 and FePO4) were prepared to investigate interfacial structure and ionic conductivity at the interface between the solid electrolyte and electrode materials. It was revealed that lithium ions in the solid electrolyte were attracted to the cathode materials with increasing electrode potential, which increases lithium vacancies in the solid electrolyte.For the FePO4 containing composites, due to the high electrode potential, lithium transfer across the interface and ionic conduction through the cathode materials was remarkable.The results suggest that severe lithium depletion occurs and interfacial resistance is large at the interface of high ionic conductors and cathode materials. The space charge layer thickness is also discussed.

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“…Although energy density of LIBs is the largest among present rechargeable devices, their power density is not enough. Their relatively low power density is explained by the following polarizations on the electrode reactions: (1) charge transfer reaction, (2) lithium ion diffusion in solid active materials, (3) electron conduction and (4) electrolyte transport. We have so far proposed and demonstrated that rate capability of lithium ion batteries (LIB) is highly improved by using nano-porous materials (e.g., TiO 2 ,[1,2] V 2 O 5 ,[3] LiFePO 4 ).…”

Section: Introductionmentioning

confidence: 99%

Rate capability of lithium intercalation into nano-porous graphitized carbons

et al. 2008

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Nanoporous graphitized carbons were successfully prepared by using mono-dispersed SiO 2 colloidal crystal as a template and mesophase pitch as a carbon source with final heat treatment temperatures (HTT) of 1000-2500 °C. Rate capability of lithium intercalation/deintercalation of the nano-porous graphitized carbons was investigated. 35-60% of capacities were retained when the current density was increased from 37.2 mA g −1 to 372 mA g −1 .Electrochemical impedance spectra indicated that formation of SEI layers caused increased polarization.

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High Power Battery Electrodes Using Nanoporous V₂O₅/Carbon Composites

Cited by 79 publications

References 17 publications

Local Structure and Ionic Conduction at Interfaces of Electrode and Solid Electrolytes

Local Structure and Ionic Conduction at Interfaces of Electrode and Solid Electrolytes

Interfacial phenomena between lithium ion conductors and cathodes

Rate capability of lithium intercalation into nano-porous graphitized carbons

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High Power Battery Electrodes Using Nanoporous V2O5/Carbon Composites

Cited by 79 publications

References 17 publications

Local Structure and Ionic Conduction at Interfaces of Electrode and Solid Electrolytes

Local Structure and Ionic Conduction at Interfaces of Electrode and Solid Electrolytes

Interfacial phenomena between lithium ion conductors and cathodes

Rate capability of lithium intercalation into nano-porous graphitized carbons

Contact Info

Product

Resources

About

High Power Battery Electrodes Using Nanoporous V₂O₅/Carbon Composites