Hierarchical Li4Ti5O12/C composite for lithium-ion batteries with enhanced rate performance

Cao, Ning; Song, Zhonghai; Qiu, Liang; Gao, Xin; Qin, Xuda

doi:10.1016/j.electacta.2017.03.032

Cited by 33 publications

(19 citation statements)

References 57 publications

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“…In turn, the bands at 348 cm −1 and 427 cm −1 correspond to the stretching-bending vibrations of the Li-O bonds in LiO 4 and LiO 6 polyhedrons. The last two bands at 679 cm −1 and 750 cm −1 are related to the vibrations of Ti-O bonds in TiO 6 octahedra [5,6,8,21,26]. It is also important that the intensities of bands in both Raman spectra are different.…”

Section: Resultsmentioning

confidence: 99%

“…Nevertheless, the TBT-LTO electrode exhibits higher rate capability than the TiO 2 -LTO electrode. This can be associated with its relatively lower size which offers more active electrode/electrolyte contact area, and, therefore, it results in shorter diffusion paths and better electrode reaction kinetics [5,8,12,13,36,37].…”

Section: Resultsmentioning

confidence: 99%

“…In recent years, the cubic spinel Li 4 Ti 5 O 12 (LTO) has become a promising anode material because of its many advantages, including a high working potential of the redox couple Ti 4+ /Ti 3+ at 1.55 V (vs. Li/Li + ), high safety, good cycling stability, high energy density, and excellent Li + intercalation/ extraction reversibility without metallic lithium deposition and with near zero volume change during discharge-charge processes [4][5][6][7][8]. On the other hand, the LTO has some serious drawbacks, such as low theoretical capacity (175 mAh g −1 ), poor intrinsic electronic conductivity (10 −13 S cm −1 ), and low lithium-ion diffusion coefficient (10 −9 -10 −13 cm 2 s −1 ).…”

Section: Introductionmentioning

confidence: 99%

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Impact of titanium precursors on formation and electrochemical properties of Li4Ti5O12 anode materials for lithium-ion batteries

Kang

Krajewski

Lin

2020

J Solid State Electrochem

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This work describes comparative study on the application of Li4Ti5O12 (LTO) as anode materials for lithium-ion batteries which were successfully prepared by sol-gel synthesis with the use of two titanium sources. One of them was anatase-type titanium dioxide (TiO2), whereas the second was tetrabutyl titanate (TBT). Both obtained LTO materials were very similar in terms of their crystallinity and purity. In turn, the sample synthetized with TBT source revealed better particle dispersibility, and its particles were slightly lower in size. These particular features resulted in higher Li+ diffusion coefficient and better kinetic of Li+ ions during charge transfer reactions for the LTO synthetized with TBT source. This reflected in specific capacitance values for both electrodes which equalled 150 mAh g−1, 120 mAh g−1, and 63 mAh g−1 for TBT-LTO and 120 mAh g−1, 80 mAh g−1, and 58 mAh g−1 for TiO2-LTO at C-rates of 1, 5, and 10 C, respectively.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Impact of titanium precursors on formation and electrochemical properties of Li4Ti5O12 anode materials for lithium-ion batteries

Kang

Krajewski

Lin

2020

J Solid State Electrochem

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“…All the plots possess a depressed semicircle at high to intermediate frequency and an oblique line at low frequency. The Nyquist plots are fitted by Zsimwin method, and the results are shown in Table S3. R e represents the electrolyte resistance, R s is the resistance of the surface film formed on the electrodes.…”

Section: Resultsmentioning

confidence: 99%

An Investigation of Titanium/Silicon Oxide‐CNTs Anode Material for Lithium‐Ion Batteries

Zhang

Zhou

2020

Batteries & Supercaps

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Discovering a high-performance (high rate capability, high specific capacity, and good stability) anode material for automobile battery applications is a great challenge. A titanium/silicon oxide-CNTs (Ti m Si n O l -CNTs) is synthesized and tested as anode material for lithium-ion batteries. High specific capacity (278 mAhg À 1 at 100 mA g À 1 ), high rate capability (156 mAh g À 1 at 4000 mA g À 1 ), and good stability (maintains 278 mAhg À 1 after 200 cycles) are reached over Ti m Si n O l -CNTs. The as-synthesized Ti m Si n O l -CNTs has a particle structure that Ti m Si n O l encapsulates CNTs with CNTs ends stretching out of the particles. In the Ti m Si n O l phase, the TiO 2 crystal seeds are formed and encapsulated in amorphous SiO y boundaries, which have sub-nano pores. The high performance properties of Ti m Si n O l -CNTs could come from the synergetic combination of (1) the excellent electronic conductivity of CNTs and the amorphous carbon in Ti m Si n O l -CNTs, (2) the high Li + intaking capability of the TiO 2 crystal seeds, (3) the high electrochemical activity of SiO y , (4) the high Li + insertion/extraction kinetics in the small TiO 2 crystal seeds and the amorphous SiO y with sub-nano pores, and (5) the high volume change tolerance offered by the CNTs binder and the amorphous SiO y .

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“…The hydrothermal process seems to be a promising alternative to the solid-state method, due to softer reaction conditions, the possibility of preparation of nanosized LTO with various morphologies, and high phase purity [13][14][15]. The resulting materials usually exhibit significantly higher discharge capacities and better cyclability compared to those synthesized by the solid-state method [15][16][17].…”

Section: Introductionmentioning

confidence: 99%

Effect of Carbon Additives on the Electrochemical Performance of Li4Ti5O12/C Anodes

et al. 2020

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The Li4Ti5O12/C composites were prepared by a hydrothermal method with in situ carbon addition. The influence of the morphology and content of various carbon materials (conductive carbon black, mesoporous carbon G_157M, and carbon replicas) on the electrochemical performance of the Li4Ti5O12/C composites was investigated. The obtained composites were characterized using X-ray diffraction, scanning electron microsopy, high-resolution transmission electron microscopy, thermogravimetric analysis, Raman spectroscopy, and N2 sorption-desorption isotherms. Morphology of the Li4Ti5O12/C composites depends on the carbon matrix used, while both morphology and the amount of carbon material have a great impact on the rate capability and cycling stability of the obtained composites. At low current densities, the Li4Ti5O12/C composite with 5 wt.% G_157M exhibits the highest discharge capacity, while at high charge-discharge rates, the Li4Ti5O12/carbon black composites show the best electrochemical performance. Thus, at ~0.1C, 5C, and 18C rates, the discharge capacities of the obtained Li4Ti5O12/C composites are 175, 120, and 70 mAh/g for G_157M, 165, 126, and 78 mAh/g for carbon replicas, and 173, 128, and 93 mAh/g for carbon black. After 100 cycles, their capacity retention is no less than 95%, suggesting their promising application perspective.

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Hierarchical Li4Ti5O12/C composite for lithium-ion batteries with enhanced rate performance

Cited by 33 publications

References 57 publications

Impact of titanium precursors on formation and electrochemical properties of Li4Ti5O12 anode materials for lithium-ion batteries

Impact of titanium precursors on formation and electrochemical properties of Li4Ti5O12 anode materials for lithium-ion batteries

An Investigation of Titanium/Silicon Oxide‐CNTs Anode Material for Lithium‐Ion Batteries

Effect of Carbon Additives on the Electrochemical Performance of Li4Ti5O12/C Anodes

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