High-Rate Capabilities of Ferroelectric BaTiO3-LiCoO2 Composites with Optimized BaTiO3 Loading for Li-Ion Batteries

Teranishi, Takashi; Yoshikawa, Yuzo; Sakuma, Ryo; Okamura, Hirokazu; Hashimoto, Hideki; Hayashi, Hidetaka; Fujii, Toru; Kishimoto, Akira; Takeda, Yasuo

doi:10.1149/2.0041512eel

Cited by 21 publications

(26 citation statements)

References 15 publications

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“…The capacity for the bare LC cell, 11.6 mAh/g, was much smaller than that for the 2032 coin cell reported in our previous study, ³62 mAh/g. 18) The capacity of the BT 1 mol % sample at the highest rate, 10 C, was 95.1 mAh/g, which was likewise notably smaller than the capacity for the coin cell (146 mAh/g). The lower capacities in the laminated cells thus originated from the type of cell.…”

Section: High-rate Performance Of Laminated Cellsmentioning

confidence: 85%

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In situ time-resolved dispersive X-ray absorption fine structure analysis of BaTiO3–LiCoO2 composites for lithium ion batteries

Teranishi

Yoshikawa

Miyahara

et al. 2016

J. Ceram. Soc. Japan

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In this study, in situ time-resolved dispersive X-ray absorption fine structure (DXAFS) analysis of BaTiO 3 LiCoO 2 (BTLC) composites for lithium ion batteries was performed to characterize the cobalt ion valence shift between oxidized and reduced states of driven cells, in an attempt to better understand the contribution of ferroelectric solid electrolyte interfaces (SEIs) to chargedischarge rates. Two types of artificial SEIs, ferroelectric BT and paraelectric Al 2 O 3 , were compared. The magnitude of the shift in the X-ray absorption energy at the peak of the white line, E 1 , during charging and discharging at a 10 C rate, increased in the order of bare LC (0.264 eV) < Al 2 O 3 1 mol % (0.497 eV) < BT 1 mol % (1.15 eV); the corresponding discharge capacities of the laminated cells at 10 C were as follows: bare LC (11.6 mAh/g) < Al 2 O 3 (41.8 mAh/g) < BT (95.1 mAh/g). The increase in E 1 , i.e., the oxidation of Co during charging, intensified under a higher applied potential for the BT-decorated composite compared with that of the Al 2 O 3 -coated specimen. The stronger oxidation of Co for BTLC under application of a large electric field was attributed to the strengthened polarization due to the larger permittivity of BT.

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Section: High-rate Performance Of Laminated Cellsmentioning

confidence: 85%

“…The achieved capacity for a 1 mol % BT-loaded specimen at 10C (1C = 160 mA/g) was as high as 238% that of bare LC. 18) Ferroelectric domains consist of large electric dipole moments. Under an applied electric field, dipole polarization is induced by domain wall vibrations, as well as ionic and electronic contributions.…”

Section: Introductionmentioning

confidence: 99%

In situ time-resolved dispersive X-ray absorption fine structure analysis of BaTiO3–LiCoO2 composites for lithium ion batteries

Teranishi

Yoshikawa

Miyahara

et al. 2016

J. Ceram. Soc. Japan

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“…Our earlier study showed that the quantity of the impurity phase, barium carbonate, increased with BT loading for specimens with larger BT loads of >5 mol %. 16) This increase in R ct for larger BT loads is therefore attributed to the effect of the film thickness of the SEI and the evolution of the BaCO 3 impurity.…”

Section: Cell Performance Of Bt-lc Composite Cathodementioning

confidence: 95%

In situ impedance analysis on BaTiO₃–LiCoO₂composite cathodes for lithium ion batteries

Teranishi

Yoshikawa

Sakuma

et al. 2015

Jpn. J. Appl. Phys.

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In situ electrochemical impedance spectroscopy (EIS) was undertaken to investigate the contribution of a ferroelectric artificial solid electrolyte interface (SEI) to the enhancement of the rate capability of lithium ion batteries. Resistance elements, consisting of the cell reactions, the resistance of the electrolyte, R sol , that of the Li metal anode reaction, R Li , and the charge transfer resistance, R ct , were measured. A small ferroelectric BaTiO 3 (BT) load, >1 mol %, notably reduced R ct and R sol compared with bare LiCoO 2 (LC), indicating that loaded ferroelectric BT SEIs effectively promote Li inter/deintercalation into and from the active material, LC, and restrict cobalt ion dissolution into the electrolyte liquid. Lower R ct and R sol resulted in a significantly higher capacity retention ratio at a 10 C rate compared with the initial cycle for small BT load, >1 mol %. The capacity retention dropped rapidly, accompanied by a slight increase in R ct for larger BT loads, 5 and 15 mol %, which may be attributed to the thicker BT layer and the existence of the impurity phase, BaCO 3 . These results imply that the ferroelectric SEI affected the kinetics of mobile Li ions at the cathode-electrolyte interface, significantly enhancing the rate capability.

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“…[1][2][3][4][5][6] Some oxide coatings have been reported to improve the current rate performance as well as cycle performance of positive electrodes. [7][8][9][10][11][12][13][14][15][16] Especially, these coatings could decrease the activation energy of Li-ion transfer reaction at the electrode/ electrolyte interface. 7,15,16 However, it remains unclear why these oxides, with poor electronic and ionic conductivities by themselves, could improve the current rate performance and decrease the activation energy.…”

Section: Introductionmentioning

confidence: 99%

Kinetics of Li-ion Transfer at the Electrode/Electrolyte Interface and Current Rate Performance of LiCoO2 Surface-coated with Zirconium Oxide and Aluminum Oxide

2019

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Different oxide-based surface coatings were applied to the LiCoO 2 positive electrode material to improve its interfacial Li-ion transfer and current rate performance. Zr-oxide and Al-oxide were selected as coating materials, as the former hardly forms a solid-solution with LiCoO 2 while the latter readily does so. Zr-oxide-coated LiCoO 2 showed higher current rate performance and lower charge transfer resistance (R ct) compared to bare and Al-oxidecoated LiCoO 2. The difference in current rate performance was quantitatively explained by the different R ct. The activation energy (E a) for the charge transfer reaction was approximately 10 kJ mol −1 lower for Zr-oxide-coated LiCoO 2 than the other two. The lower E a of the former, which suggests lower activation barriers for the elementary processes of Li-ion transfer at the electrode/electrolyte interface, lowered the R ct and increased the current rate performance. The R ct of Zr-oxide-coated LiCoO 2 decreased from the 2nd to 4th cycle, while for Al-oxide-coated LiCoO 2 it remained almost constant during the early cycles. The formation of the new electrode/electrolyte interface during the early cycles that depends on the solubility of cations in the oxide coatings into LiCoO 2 contributes to the different R ct change and E a values.

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High-Rate Capabilities of Ferroelectric BaTiO3-LiCoO2 Composites with Optimized BaTiO3 Loading for Li-Ion Batteries

Cited by 21 publications

References 15 publications

In situ time-resolved dispersive X-ray absorption fine structure analysis of BaTiO<sub>3</sub>–LiCoO<sub>2</sub> composites for lithium ion batteries

In situ time-resolved dispersive X-ray absorption fine structure analysis of BaTiO<sub>3</sub>–LiCoO<sub>2</sub> composites for lithium ion batteries

In situ impedance analysis on BaTiO₃–LiCoO₂composite cathodes for lithium ion batteries

Kinetics of Li-ion Transfer at the Electrode/Electrolyte Interface and Current Rate Performance of LiCoO<sub>2</sub> Surface-coated with Zirconium Oxide and Aluminum Oxide

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High-Rate Capabilities of Ferroelectric BaTiO3-LiCoO2 Composites with Optimized BaTiO3 Loading for Li-Ion Batteries

Cited by 21 publications

References 15 publications

In situ time-resolved dispersive X-ray absorption fine structure analysis of BaTiO<sub>3</sub>&ndash;LiCoO<sub>2</sub> composites for lithium ion batteries

In situ time-resolved dispersive X-ray absorption fine structure analysis of BaTiO<sub>3</sub>&ndash;LiCoO<sub>2</sub> composites for lithium ion batteries

In situ impedance analysis on BaTiO3–LiCoO2composite cathodes for lithium ion batteries

Kinetics of Li-ion Transfer at the Electrode/Electrolyte Interface and Current Rate Performance of LiCoO<sub>2</sub> Surface-coated with Zirconium Oxide and Aluminum Oxide

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In situ time-resolved dispersive X-ray absorption fine structure analysis of BaTiO<sub>3</sub>–LiCoO<sub>2</sub> composites for lithium ion batteries

In situ time-resolved dispersive X-ray absorption fine structure analysis of BaTiO<sub>3</sub>–LiCoO<sub>2</sub> composites for lithium ion batteries

In situ impedance analysis on BaTiO₃–LiCoO₂composite cathodes for lithium ion batteries