Influence of Diffusion Plane Orientation on Electrochemical Properties of Thin Film LiCoO[sub 2] Electrodes

Bouwman, Peter J.; Boukamp, Bernard A.; Bouwmeester, Henricus J.M.; Notten, Peter H. L.

doi:10.1149/1.1471543

Cited by 93 publications

(97 citation statements)

References 17 publications

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“…They also report that a-axis oriented films show a superior electrochemical performance and faster relaxation characteristics than the c-axis oriented films. 4) This result suggests that perpendicular alignment of the interlayer of the LiCoO 2 lattice on the electrode contributes to the easy access of the Li-ions.…”

Section: Introductionmentioning

confidence: 92%

Fabrication of the oriented LiCoO2 sheet using a strong magnetic field

Yamada

Suzuki

Uchikoshi

et al. 2011

J. Ceram. Soc. Japan

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LiCoO 2 is a popular positive electrode material for Li-ion secondary batteries. The perpendicular alignment of the interlayer of the LiCoO 2 lattice on the electrode contributes to easy access of Li-ions. In this study, we report the preparation of an oriented LiCoO 2 sheet using the conventional coating method followed by drying in a maximum 12 T strong magnetic field. We discuss the effect of the particle shape and viscosity of the paste on the degree of orientation. As a result, when the sheets are dried in a strong horizontal magnetic field, the electrochemical active planes of the LiCoO 2 are aligned perpendicular to the sheet surface.

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Section: Introductionmentioning

confidence: 92%

Fabrication of the oriented LiCoO2 sheet using a strong magnetic field

Yamada

Suzuki

Uchikoshi

et al. 2011

J. Ceram. Soc. Japan

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“…As other research investigated the surfaces by atomic force microscopy (AFM), for the film-type cathode, such as LiMn 2 O 4 , LiCoO 2 , LiNi 1/3 Co 1/3 Mn 1/3 O 2 , the RMS roughness is around 10-20 nm. [54][55][56][57][58] On the other hand, for the bulk-type cathode, the RMS roughness is around 100-200 nm, such as LiFePO 4 59-61 Currently, C(q) is not available for all-solid-state battery electrode and solid-electrolyte surface yet. Therefore, we rationalize C(q) for the observed RMS based on the surface analysis by Flys et al 47 In their study, they have used AFM to investigate the surface profile and obtained C(q) for samples prepared with different RMS roughness, ranging from 2 to 120 nm.…”

Section: After LImentioning

confidence: 99%

Simulation of the Effect of Contact Area Loss in All-Solid-State Li-Ion Batteries

Tian

2017

J. Electrochem. Soc.

128

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Maintaining the physical contact between the solid electrolyte and the electrode is important to improve the performance of all-solidstate batteries. Imperfect contact can be formed during cell fabrication and will be worsened due to cycling, resulting in degradation of the battery performance. In this paper, the effect of imperfect contact area was incorporated into a 1-D Newman battery model by assuming the current and Li concentration will be localized at the contacted area. Constant current discharging processes at different rates and contact areas were simulated for a film-type Li|LiPON|LiCoO 2 all-solid-state Li-ion battery. The capacity drop was correlated with the contact area loss. It was found at lower cutoff voltage, the correlation is almost linear with a slope of 1; while at a higher cutoff voltage, the dropping rate is slower. To establish the relationship between the applied pressure and the contact area, Persson's contact mechanics theory was applied, as it uses self-affined surfaces to simplify the multi-length scale contacts in all-solid-state batteries. The contact area and pressure were computed for both film-type and bulk-type all-solid-state Li-ion batteries. The model is then used to suggest how much pressures should be applied to recover the capacity drop due to contact area loss. Conventional Li-ion batteries usually include a liquid electrolyte, which facilitates Li-ions transport between cathode and anode. However, the applications of Li-ion batteries are still limited by the flammability and narrow electrochemical window of the liquid electrolytes. 1-3During the past decades, several solid electrolytes 4-9 with the ionic conductivity close to the liquid electrolyte have been developed, thus enabled the development of all-solid-state batteries. The benefits of all-solid-state batteries are high energy density, non-flammability, and the large electrochemical window (if the solid electrolyte form stable interphase layers on electrode surface). 10,11However, a major bottleneck for all-solid-state Li-ion batteries lies at the high interfacial resistance due to two main factors, chemical effect and physical contact. 3 The chemical effect refers to the chemical changes at the solid-electrolyte/electrode interface that cause slower transport. The chemical changes include the interphase layer formation due to solid electrolyte decomposition, 11 and/or Li-ion depletion zone at the interface 12 (for example, LiPON/Li 2 CO 3 ). Physical contact induced impedance comes from the imperfect contact at the solid-electrolyte/electrode interface, which plays a more important role for batteries using solid-electrolytes than the conventional batteries employing liquid electrolytes. Liquid electrolytes can easily diffuse through the porous electrode and wet the electrode surface, so, any fracture and disconnection between solid particles will only cause electrical disconnection. However, for solid electrolytes, the fracture and disconnection will impede Li-ion transport, as well as electron transport. Thus...

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“…Many investigations have been carried out to understand the charge and discharge mechanism and improve the electrochemical performance of LIBs. [3][4][5][6][7][8][9][10][11][12][13][14] The LIB electrode is a "composite electrode," composed of active materials, conductive agents, and binders. Therefore, although the electrochemical characteristics of these composite electrodes must be evaluated from the viewpoint of battery engineering, it is not easy to distinguish the intrinsic properties of the active materials from those of the other materials in the composite electrode.…”

Section: Introductionmentioning

confidence: 99%

Intrinsic Electrochemical Characteristics in the Individual Needle-like LiCoO<sub>2</sub> Crystals Synthesized by Flux Growth

et al. 2017

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The intrinsic electrochemical characteristics of needle-like LiCoO 2 crystals with a hexagonal cylindrical shape were studied by the single particle measurement technique. The needle-like LiCoO 2 crystals were synthesized by the flux growth method. Single-particle Raman spectroscopy and galvanostatic charge-discharge tests at different electrical contact points in one needle-like LiCoO 2 crystal revealed that the crystal has homogeneous intercalation/ deintercalation characteristics throughout the long axis. This suggests that the electron conductivity is high on a 100 µm scale along that axis and that lithium ions are efficiently transferred from the electrolyte to the layer structure of the crystal. The charge rate characteristics of the needle-like LiCoO 2 crystals were also evaluated and compared to those of powdered LiCoO 2 . The polarization curve analysis indicates that the needle-like LiCoO 2 particles had almost same exchange current density, i 0 , as powdered LiCoO 2 , which has a much smaller volume. These excellent electrochemical characteristics are considered to be due to the orientation of the {104} crystal face on the crystal sides, which is the preferential face for lithium ion transfer, and the larger effective surface area of the particles.

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Influence of Diffusion Plane Orientation on Electrochemical Properties of Thin Film LiCoO[sub 2] Electrodes

Cited by 93 publications

References 17 publications

Fabrication of the oriented LiCoO2 sheet using a strong magnetic field

Fabrication of the oriented LiCoO2 sheet using a strong magnetic field

Simulation of the Effect of Contact Area Loss in All-Solid-State Li-Ion Batteries

Intrinsic Electrochemical Characteristics in the Individual Needle-like LiCoO<sub>2</sub> Crystals Synthesized by Flux Growth

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