Effects of annealing temperature on structure and opt-electric properties of ion-conducting LLTO thin films prepared by RF magnetron sputtering

Xiong, Yuli; Tao, Haizheng; Jian-Gao, Zhao; Cheng, Hao; Zhao, Xiujian

doi:10.1016/j.jallcom.2010.10.086

Cited by 55 publications

(43 citation statements)

References 21 publications

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“…The ionic conductivity of -LLTO thin-film is calculated based on its bulk resistance determined by the intercept on Zre axis of EIS curve ( Figure 1d) and its thickness determined in the side-view SEM image (insert in Figure 1c). The as-deposited -LLTO thin-film performs an ionic conductivity of 1.54 × 10-5 S/cm at room temperature, which is comparable to the reported values for -LLTO thin-film solid electrolytes [32][33]. Additionally, the previous literatures have demonstrated -LLTO thin-film solid electrolytes are with excellent chemical and electrochemical stabilities [31].…”

Section: Resultssupporting

confidence: 83%

Improved cycling stability of LiCoO2 at 4.5 V via surface modification of cathode plates with conductive LLTO

Song

Peng

Huang

et al. 2020

Preprint

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The stability issue of LiCoO 2 cycled at high voltages is one of the burning questions for the development of lithium ion batteries with high energy density and long cycling life. Although it is effective to improve the cycling performance of LiCoO 2 via coating individual LiCoO 2 particles with another metal oxides or fluorides, the rate capacity is generally compromised because the typical coating materials are poor conductors. Herein, amorphous Li 0.33 La 0.56 TiO 3 , one of the most successful solid electrolytes, was directly deposited on the surface of made-up LiCoO 2 cathode plates through magnetron sputtering. Not only the inherent conductive network in the made-up LiCoO 2 cathode plates was retained, but also the Li + transport in bulk and across the cathode-electrolyte interface was enhanced. In addition, the surface chemical analysis of the cycled LiCoO 2 cathode plates suggests that most of the stability issues can be addressed via the deposition of amorphous Li 0.33 La 0.56 TiO 3 . With an optimized deposition time, the LiCoO 2 cathode plates modified by Li 0.33 La 0.56 TiO 3 performed a steady reversible capacity of 150 mAh/g at 0.2 C with the cut-off voltage from 2.75 to 4.5 V vs. Li + /Li, and an 84.6% capacity gain at 5 C comparing with the pristine one.

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Section: Resultssupporting

confidence: 83%

Improved cycling stability of LiCoO2 at 4.5 V via surface modification of cathode plates with conductive LLTO

Song

Peng

Huang

et al. 2020

Preprint

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“…However, at lithium content of 150% the ionic conductivity of the thin film electrolyte can reach 10 6 S/cm, which is very similar to that reported in the literature [17]. At a lithium content of 180% the ionic conductivity decreased to 3×10 7 S/cm.…”

Section: Analysis Of Impedance Propertiessupporting

confidence: 89%

“…Then, the mixtures were calcined at 1050, 1100 and 1200°C, respectively, all for 12 h [17]. The obtained ceramic was then ball-milled to obtain a fine powder.…”

Section: Preparation Of Targetsmentioning

confidence: 99%

Preparation and performance of novel LLTO thin film electrolytes for thin film lithium batteries

et al. 2012

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We prepared a series of lithium lanthanum titanate (LLTO) thin film electrolytes by radio frequency (RF) magnetron sputtering using LLTO targets in a N 2 atmosphere. We also deposited the LLTO thin films in an Ar atmosphere under a same condition as references for comparison. The microstructure morphology and the composition of the thin films were investigated by X-ray diffraction (XRD), scanning electron microscopy (SEM) and X-ray photoelectron spectroscopy (XPS), respectively. Results show that the thin film has an amorphous structure with a uniform surface and it is free of pinholes and cracks. Impedance measurements reveal that the ionic conductivity of the electrolytes is beneficial for all solid lithium batteries dependent on the lithium content at room temperature. We found that the amorphous LLTO thin film performs well and it has potential application in microbatteries for use in microelectronic devices. LLTO thin film electrolytes, RF magnetron sputtering, ionic conductivity, lithium batteries Citation:Chen R J, Liang W, Zhang H Q, et al. Preparation and performance of novel LLTO thin film electrolytes for thin film lithium batteries. Chin Sci Bull, 2012, 57: 41994204, doi: 10.1007/s11434-012-5292-y Thin film energy storage has attracted much attention recently because of the application of ultra-miniaturization in microelectronic devices such as dynamic random access memory (DRAMS) and implantable medical devices [1][2][3]. By comparison with other microelectronic sources, thin film lithium batteries can potentially store the most energy applied to microelectronic devices because of their high specific energy, long cycle life, good safety performance and environmental friendliness [4][5][6][7]. Solid electrolytes are important components in thin film lithium batteries and the performance of a thin film lithium battery is greatly affected by its solid electrolyte [8,9]. It has been reported that the ionic conductivity of La 2/3x Li 3x TiO 3 (x=0.11) is able to reach 10 3 S/cm at room temperature, making the study of this kind of electrolyte with high ionic conductivity attractive. Recently, lithium lanthanum titanate (LLTO) has become a very interesting material [10][11][12] because it has a high rate of ionic conductivity in the amorphous state. And the amorphouse LLTO is one kind of fast ionic conductor [13].Thin film fabrication can reduce the thickness of the electrolyte layer, resulting in a reduction in the internal resistance of devices. A large surface area is also necessary to achieve a large contact area for a large output current. RF magnetron sputtering is an effective thin film deposition technology for it can be easily used to fabricate large-scale and dense films with outstanding performance [14][15][16].In this work, we successfully prepared LLTO thin film electrolytes using RF magnetron sputtering. This constitutes a new chemical composition with an amorphous glassy structure and predominantly ionic conduction. We prepared the nitride LLTO films for the first time with different li...

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“…However, the XRD patterns for the thin film electrolytes fabricated at the substrate temperatures below 300°C only have broad haloes, showing that the thin films should be of amorphous phase. When the substrate temperature reaches 400°C, other unexpected crystal phases such as ITO come out [20], which indicate the destruction of the ITO films.…”

Section: Structure and Morphology Of The Thin Filmsmentioning

confidence: 99%

Fabrication and ionic conductivity of amorphous Li–Al–Ti–P–O thin film

Chen

Tao

Zhao

et al. 2011

Journal of Non-Crystalline Solids

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Effects of annealing temperature on structure and opt-electric properties of ion-conducting LLTO thin films prepared by RF magnetron sputtering

Cited by 55 publications

References 21 publications

Improved cycling stability of LiCoO2 at 4.5 V via surface modification of cathode plates with conductive LLTO

Improved cycling stability of LiCoO2 at 4.5 V via surface modification of cathode plates with conductive LLTO

Preparation and performance of novel LLTO thin film electrolytes for thin film lithium batteries

Fabrication and ionic conductivity of amorphous Li–Al–Ti–P–O thin film

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