Stabilization of Li0.33La0.55TiO3 Solid Electrolyte Interphase Layer and Enhancement of Cycling Performance of LiNi0.5Co0.3Mn0.2O2 Battery Cathode with Buffer Layer.

Feihu Tan,Zhengchun Peng,Jun Du,Hua An,Ning Li

doi:10.3390/nano11040989

Feihu Tan, Zhengchun Peng + Show 3 more

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https://doi.org/10.3390/nano11040989

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Abstract

All-solid-state batteries (ASSBs) are attractive for energy storage, mainly because introducing solid-state electrolytes significantly improves the battery performance in terms of safety, energy density, process compatibility, etc., compared with liquid electrolytes. However, the ionic conductivity of the solid-state electrolyte and the interface between the electrolyte and the electrode are two key factors that limit the performance of ASSBs. In this work, we investigated the structure of a Li0.33La0.55TiO3 (LLTO) thin-film solid electrolyte and the influence of different interfaces between LLTO electrolytes and electrodes on battery performance. The maximum ionic conductivity of the LLTO was 7.78 × 10−5 S/cm. Introducing a buffer layer could drastically improve the battery charging and discharging performance and cycle stability. Amorphous SiO2 allowed good physical contact with the electrode and the electrolyte, reduced the interface resistance, and improved the rate characteristics of the battery. The battery with the optimized interface could achieve 30C current output, and its capacity was 27.7% of the initial state after 1000 cycles. We achieved excellent performance and high stability by applying the dense amorphous SiO2 buffer layer, which indicates a promising strategy for the development of ASSBs.

Highlights

IntroductionOver the past several decades, the successful application of lithium-ion batteries has revolutionized personal electronic devices and significantly changed our lifestyle [1,2]
Over the past several decades, the successful application of lithium-ion batteries has revolutionized personal electronic devices and significantly changed our lifestyle [1,2].All-solid-state lithium batteries (ASSBs) are promising battery systems for electric vehicles and smart devices owing to their safety, energy density, packaging, and operating temperature range compared with traditional liquid electrolytics [3,4,5]
X-ray diffraction (XRD) patterns in Figure 1h indicate that both the as-deposited film and the film annealed at 300 ◦ C were amorphous, and the samples crystallized presumably after annealing at 400 ◦ C, which agrees with the scanning electron microscopy (SEM) images and electrochemical impedance spectra

Summary

Introduction

Over the past several decades, the successful application of lithium-ion batteries has revolutionized personal electronic devices and significantly changed our lifestyle [1,2]. All-solid-state lithium batteries (ASSBs) are promising battery systems for electric vehicles and smart devices owing to their safety, energy density, packaging, and operating temperature range compared with traditional liquid electrolytics [3,4,5]. Organic solid electrolytes are characterized by good processability and high Li+ conductivity at relatively high temperatures [9,10] and are potentially used in large-scale applications such as wearable [11] and micro intelligent devices [12]. Lix Lay TiO3 (LLTO) with a perovskite structure shows high ionic conductivity (10−3 –10−6 S/cm) [19], good mechanical strength, and flexibility. The ionic conductivity of LLTO thin films is much lower than that of bulk

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