Improved electrochemical properties of Li4Ti5O12–Li0.33La0.56TiO3 composite anodes prepared by a solid-state synthesis

Zhu, Yan‐Rong; Yuan, Jing; Zhu, Min; Hao, Guodong; Yi, Ting‐Feng; Xie, Ying

doi:10.1016/j.jallcom.2015.05.239

Cited by 21 publications

(20 citation statements)

References 56 publications

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“…As result, one can produce a large number of materials of different shapes and morphologies, which are difficult to obtain by conventional methods, due to their high melting temperatures. This method is also commonly used for coating of battery materials [27,28].…”

Section: Resultsmentioning

confidence: 99%

Enhancing the Stability of LiNi0.5Mn1.5O4 by Coating with LiNbO3 Solid-State Electrolyte: Novel Chemically Activated Coating Process versus Sol-Gel Method

et al. 2021

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LiNbO3-coated LiNi0.5Mn1.5O4 spinel was fabricated by two methods: using hydrogen-peroxide as activating agent and sol-gel method. The structure of the obtained cathode materials was investigated using a scanning electron microscope (SEM), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), and the electrochemical properties of the prepared cathodes were probed by charge-discharge studies. The morphology of the coating material on the surface and the degree of coverage of the coated particles were investigated by SEM, which showed that the surface of LiNi0.5Mn1.5O4 particles is uniformly encapsulated by lithium innovate coating. The influence of the LiNbO3 coating layer on the spinel’s properties was explored, including its effect on the crystal structure and electrochemical performance. XRD studies of the obtained coated active materials revealed very small expansion or contraction of the unit cell. From the capacity retention tests a significant improvement of the electrochemical properties resulted when a novel chemically activated coating process was used. Poorer results, however, were obtained using the sol-gel method. The results also revealed that the coated materials by the new method exhibit enhanced reversibility and stability compared to the pristine and reference ones. It was shown that the morphology of the coating material and possible improvement of communication between the substrates play an important role.

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Section: Resultsmentioning

confidence: 99%

Enhancing the Stability of LiNi0.5Mn1.5O4 by Coating with LiNbO3 Solid-State Electrolyte: Novel Chemically Activated Coating Process versus Sol-Gel Method

et al. 2021

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“…The diffusion coefficient (D Li ) of the LTO-composite electrodes were calculated using eqs S1−S3. 39 All of the Nyquist spectra (Figures 5a,c) exhibit semicircles and tail in the high and low frequency regions, respectively. The electrical/ionic conductivity at the interface is represented by the R ct , and the diffusion of Li + into the bulk of the active material is related to W. Appropriate LiAlO 2 (5 wt %) and Li 6 SiON (10 wt %) modification improves the conduction of LTO anode as demonstrated in Figure 5.…”

Section: Figures 4c and S7bmentioning

confidence: 94%

“…The Li + diffusivity result can be compared (Table S6) to reported LTO-LiAlO 2 and LTO−Li 0.33 La 0.56 TiO 3 composite electrodes. 39,47 The calculated Li + diffusion coefficients for pristine LTO, LTO-LiAlO 2 , and LTO-Li 6 SiON are listed in Table 3. LTO-5LiAlO 2 -10Li 6 SiON has the highest diffusion coefficient (∼2.7 × 10 −12 ) among the LTO electrodes reported here.…”

Section: Figures 4c and S7bmentioning

confidence: 99%

“…35−38 Although carbon-coatings offer a very efficient way to improve LTO anode rate capabilities, they also decrease cell's volumetric energy densities. 12,39 Furthermore, fabrication of uniform and optimized carbon coated LTO using economically facile techniques remains challenging. 12 Syntheses of nano LTO particles including nanorods, nanotubes, and nanowires offers an efficient strategy to improve LTO electrochemical performance.…”

Section: Introductionmentioning

confidence: 99%

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Improved Electrochemical Properties of Li₄Ti₅O₁₂ Nanopowders (NPs) via Addition of LiAlO₂ and Li₆SiON Polymer Electrolytes, Derived from Agricultural Waste

Temeche

Buch

Zhang

et al. 2021

ACS Appl. Energy Mater.

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Li 4 Ti 5 O 12 (LTO) has received considerable interest as an alternate anode material for high power density batteries for large scale applications. However, LTO suffers from poor Li + diffusivity and poor electronic conductivity, resulting in capacity loss and poor rate performance. Here we demonstrate a facile synthesis of LTO NPs using liquid-feed flame spray pyrolysis (LF-FSP) which provides high surface area (∼38 m 2 /g) spinel structure LTO NPs with average particle sizes (APSs) of 45 ± 0.3 nm. Pristine LTO-Li half-cells exhibit reversible capacity of 70 mAh/g at 10 C. In this study, we show that mixing LiAlO 2 NPs (5 wt %) and Li 6 SiON polymer precursor (10 wt %) with pristine LTO via ball-milling and ultrasonication followed by tape casting enhances the LTO rate performance providing reversible capacity of ∼217 mAh/g at 5 C over 500 cycles. The Li 6 SiON polymer electrolyte is synthesized from rice hull ash (RHA), an agricultural waste, providing a green synthetic approach to electrode coating materials. CV and EIS studies indicate that adding the solid and polymer electrolytes reduces charge-transfer resistance and electrode polarization, enhancing both reversibility and the LTO Li + diffusion coefficient from 4.6 × 10 −14 to 2.7 × 10 −12 cm 2 /s.

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“…Besides these, introducing heterogeneous atoms into the lattice to occupy the positions of Li, Ti, or O can also effectively improve the intrinsic electronic and ionic conductivities. In general, cations with different radii (Na + , , K + , La 3+ , Ca 2+ , etc.) can increase lattice distortion.…”

Section: Introductionmentioning

confidence: 99%

Theoretical Prediction and Experimentally Realizing Cathodic Doping of Sulfur in Li₄Ti₅O₁₂ for Superior Lithium Storage Performance

Shen

Zhu

Sun

et al. 2021

ACS Appl. Energy Mater.

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Heteroatom doping has been considered an effective way to improve the kinetically limited Li 4 Ti 5 O 12 as anode materials in lithium-ion batteries. Although a number of elements have been reported to enhance the conductivities of Li 4 Ti 5 O 12 , the influence of sulfur has been rarely investigated. More interestingly, the different valences of sulfur can lead to different cathodic or anodic dopings. In turn, theoretical prediction by equilibrium phase diagrams and density functional theory calculations and experimental confirmation using a facile thermal process were carried out to investigate the S-doping sites in Li 4 Ti 5 O 12 using thiourea as the sulfur source. It is found that sulfur is more likely to be doped on Ti sites under oxygen-rich conditions. Meanwhile, significant influences such as decreased band gap, enhanced lattice spacing, and increased Ti 3+ and oxygen vacancies are introduced by S-doping. In turn, kinetically limited performance of anode materials Li 4 Ti 5 O 12 for lithium-ion batteries (LIBs) has been significantly improved, including high specific capacity (near theoretical value at 1 C), impressive rate performance, and remarkable cycle performance (126.4 mA h g −1 after 1000 cycles at 20 C with a Coulomb efficiency of up to 99.34%), indicating its wide applications in advanced LIBs.

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Improved electrochemical properties of Li4Ti5O12–Li0.33La0.56TiO3 composite anodes prepared by a solid-state synthesis

Cited by 21 publications

References 56 publications

Enhancing the Stability of LiNi0.5Mn1.5O4 by Coating with LiNbO3 Solid-State Electrolyte: Novel Chemically Activated Coating Process versus Sol-Gel Method

Enhancing the Stability of LiNi0.5Mn1.5O4 by Coating with LiNbO3 Solid-State Electrolyte: Novel Chemically Activated Coating Process versus Sol-Gel Method

Improved Electrochemical Properties of Li₄Ti₅O₁₂ Nanopowders (NPs) via Addition of LiAlO₂ and Li₆SiON Polymer Electrolytes, Derived from Agricultural Waste

Theoretical Prediction and Experimentally Realizing Cathodic Doping of Sulfur in Li₄Ti₅O₁₂ for Superior Lithium Storage Performance

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Improved electrochemical properties of Li4Ti5O12–Li0.33La0.56TiO3 composite anodes prepared by a solid-state synthesis

Cited by 21 publications

References 56 publications

Enhancing the Stability of LiNi0.5Mn1.5O4 by Coating with LiNbO3 Solid-State Electrolyte: Novel Chemically Activated Coating Process versus Sol-Gel Method

Enhancing the Stability of LiNi0.5Mn1.5O4 by Coating with LiNbO3 Solid-State Electrolyte: Novel Chemically Activated Coating Process versus Sol-Gel Method

Improved Electrochemical Properties of Li4Ti5O12 Nanopowders (NPs) via Addition of LiAlO2 and Li6SiON Polymer Electrolytes, Derived from Agricultural Waste

Theoretical Prediction and Experimentally Realizing Cathodic Doping of Sulfur in Li4Ti5O12 for Superior Lithium Storage Performance

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Improved Electrochemical Properties of Li₄Ti₅O₁₂ Nanopowders (NPs) via Addition of LiAlO₂ and Li₆SiON Polymer Electrolytes, Derived from Agricultural Waste

Theoretical Prediction and Experimentally Realizing Cathodic Doping of Sulfur in Li₄Ti₅O₁₂ for Superior Lithium Storage Performance