Dataset Information

Fabrication of Li₄Ti₅O₁₂-TiO₂ Nanosheets with Structural Defects as High-Rate and Long-Life Anodes for Lithium-Ion Batteries.

ABSTRACT: Development of high-power lithium-ion batteries with high safety and durability has become a key challenge for practical applications of large-scale energy storage devices. Accordingly, we report here on a promising strategy to synthesize a high-rate and long-life Li₄Ti₅O₁₂-TiO₂ anode material. The novel material exhibits remarkable rate capability and long-term cycle stability. The specific capacities at 20 and 30?C (1?C?=?175?mA?g^-1) reach 170.3 and 168.2?mA?h g^-1, respectively. Moreover, a capacity of up to 161.3?mA?h g^-1 is retained after 1000 cycles at 20?C, and the capacity retention ratio reaches up to 94.2%. The extraordinary rate performance of the Li₄Ti₅O₁₂-TiO₂ composite is attributed to the existence of oxygen vacancies and grain boundaries, significantly enhancing electrical conductivity and lithium insertion/extraction kinetics. Meanwhile, the pseudocapacitive effect is induced owing to the presence of abundant interfaces in the composite, which is beneficial to enhancing specific capacity and rate capability. Additionally, the ultrahigh capacity at low rates, greater than the theoretical value of spinel Li₄Ti₅O₁₂, may be correlated to the lithium vacancies in 8a sites, increasing the extra docking sites of lithium ions.

SUBMITTER: Xu H

PROVIDER: S-EPMC5462757 | biostudies-literature | 2017 Jun

REPOSITORIES: biostudies-literature

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Fabrication of Li4Ti5O12-TiO2 Nanosheets with Structural Defects as High-Rate and Long-Life Anodes for Lithium-Ion Batteries.

Xu Hui H Chen Jian J Li Yanhuai Y Guo Xinli X Shen Yuanfang Y Wang Dan D Zhang Yao Y Wang Zengmei Z

Scientific reports 20170607 1

Development of high-power lithium-ion batteries with high safety and durability has become a key challenge for practical applications of large-scale energy storage devices. Accordingly, we report here on a promising strategy to synthesize a high-rate and long-life Li4Ti5O12-TiO2 anode material. The novel material exhibits remarkable rate capability and long-term cycle stability. The specific capacities at 20 and 30 C (1 C = 175 mA g-1) reach ...[more]

PMID: 28592792

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Project description:Most highly Li-conducting solid electrolytes (σRT > 10-3 S cm-1) are unstable against lithium-metal and suffer from detrimental solid-electrolyte decomposition at the lithium-metal/solid-electrolyte interface. Solid electrolytes that are stable against lithium metal thus offer a direct route to stabilize lithium-metal/solid-electrolyte interfaces, which is crucial for realizing all-solid-state batteries that outperform conventional lithium-ion batteries. In this study, we investigate Li5NCl2 (LNCl), a fully-reduced solid electrolyte that is thermodynamically stable against lithium metal. Combining experiments and simulations, we investigate the lithium diffusion mechanism, different synthetic routes, and the electrochemical stability window of LNCl. Li nuclear magnetic resonance (NMR) experiments suggest fast Li motion in LNCl, which is however locally confined and not accessible in macroscopic LNCl pellets via electrochemical impedance spectroscopy (EIS). With ab-initio calculations, we develop an in-depth understanding of Li diffusion in LNCl, which features a disorder-induced variety of different lithium jumps. We identify diffusion-limiting jumps providing an explanation for the high local diffusivity from NMR and the lower macroscopic conductivity from EIS. The fundamental understanding of the diffusion mechanism we develop herein will guide future conductivity optimizations for LNCl and may be applied to other highly-disordered fully-reduced electrolytes. We further show experimentally that the previously reported anodic limit (>2 V vs Li+/Li) is an overestimate and find the true anodic limit at 0.6 V, which is in close agreement with our first-principles calculations. Because of LNCl's stability against lithium-metal, we identify LNCl as a prospective artificial protection layer between highly-conducting solid electrolytes and strongly-reducing lithium-metal anodes and thus provide a computational investigation of the chemical compatibility of LNCl with common highly-conducting solid electrolytes (Li6PS5Cl, Li3YCl6, ...). Our results set a framework to better understand and improve highly-disordered fully-reduced electrolytes and highlight their potential in enabling lithium-metal solid-state batteries.

Dataset Information

Fabrication of Li₄Ti₅O₁₂-TiO₂ Nanosheets with Structural Defects as High-Rate and Long-Life Anodes for Lithium-Ion Batteries.

Publications

Fabrication of Li<sub>4</sub>Ti<sub>5</sub>O<sub>12</sub>-TiO<sub>2</sub> Nanosheets with Structural Defects as High-Rate and Long-Life Anodes for Lithium-Ion Batteries.

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