Mesoporous Spherical Li4Ti5O12 as High‐Performance Anodes for Lithium‐Ion Batteries

Du, Guojun; Liu, Zhaolin; Tay, Siok Wei; Liu, Xiaogang; Yu, Aishui

doi:10.1002/asia.201402224

Cited by 8 publications

(6 citation statements)

References 30 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…7,15 Moreover, the slopes in low frequency are directly proportional to the lithium ion diffusion coefficient (D Li ). [42][43][44] The D Li can be calculated from the plots in low frequency region according to the following equations: 42,45,46…”

Section: Resultsmentioning

confidence: 99%

See 1 more Smart Citation

Synthesis and electrochemical performance of Li₄Ti₅O₁₂/TiO₂/C nanocrystallines for high-rate lithium ion batteries

Zhu

Zhang

et al. 2015

RSC Adv.

View full text Add to dashboard Cite

composites, which can be attributed to high grain boundary density, abundant phase interfaces and in situ formed carbon, for storing extra lithium ions, enhancing rapid lithium insertion/extraction kinetics and improving electron transport rate. Corresponding 14As is well known, the volumic capacity is an important parameter for the practical application of Li 4 Ti 5 O 12 -based materials 37,38 . The capacities of the samples in this work are addressed not only by weight dimensionality (mAh g -1 ) but also by volume (mAh cm -3 ). The densities of the pure composites are calculated to be 3.41, 2.97, 3.52 and 3.26 g cm -3 , respectively. The initial three charge-discharge cycle profiles for pure composite electrodes with a current rate of 0. 5 C (1 C= 175 mA g -1 ) are shown in Fig 7a-d. Agree well with the result of CV curves (Fig. 6), two long flat plateaus at about 1.51 and 1.62 V are observed for all the samples due to the typical lithium insertion/extraction processes of Li 4 Ti 5 O 12 . Moreover, the voltage plateaus at around 1.98 and 1.72 V are verified as the lithium ion insertion/extraction reaction of anatase TiO 2 . 5 The initial discharge capacities of pure composites are 134, 157, 144 and 170 mAh g −1 , corresponding to 455, 466, 506 and 554 mAh cm -3 , respectively. The charge-discharge profiles of all samples are nearly invariable after the second cycle. The reversible capacities of the third cycle for pure composites are approximately 87, 119, 117 and 143 mAh g −1 , corresponding to 297, 353, 411 and 466 mAh cm -3 , respectively.The higher specific capacity of Li 4 Ti 5 O 12 /TiO 2 /C composite is contributed by relatively high theoretical capacity of anatase TiO 2 and carbon, and the extra lithium storage derived from phase interfaces.

show abstract

Section: Resultsmentioning

confidence: 99%

“…. Moreover, the slopes in low frequency are directly proportional to the lithium ion diffusion coefficient (D Li ) [42][43][44]. It is found that the sizes of semicircles forLi 4 Ti 5 O 12 /C and Li 4 Ti 5 O 12 /TiO 2 /C composites are smaller than that of pure Li 4 Ti 5 O 12 and Li 4 Ti 5 O 12 /TiO 2 composite.…”

mentioning

confidence: 99%

Synthesis and electrochemical performance of Li₄Ti₅O₁₂/TiO₂/C nanocrystallines for high-rate lithium ion batteries

Zhu

Zhang

et al. 2015

RSC Adv.

View full text Add to dashboard Cite

show abstract

“…According to the equivalent circuit, R s represents the electrolyte resistancea nd R ct represents the charge-transfer resistance, [27] and the two indices were calculated by the equivalentc ircuit and are shown in Table 1. Whether using pure TiO 2 or TiO 2 -RGO electrodes, the impedance of electrodes decreases after cycling because of the solid-electrolytei nterphase (SEI)f ormation and electrode/electrolyte activation.…”

Section: Resultsmentioning

confidence: 99%

Reduced Graphene Oxide‐Supported TiO₂ Fiber Bundles with Mesostructures as Anode Materials for Lithium‐Ion Batteries

Zhen

Zhu

Zhang

et al. 2015

Chemistry A European J

View full text Add to dashboard Cite

Although the synthesis of mesoporous materials is well established, the preparation of TiO2 fiber bundles with mesostructures, highly crystalline walls, and good thermal stability on the RGO nanosheets remains a challenge. Herein, a low-cost and environmentally friendly hydrothermal route for the synthesis of RGO nanosheet-supported anatase TiO2 fiber bundles with dense mesostructures is used. These mesostructured TiO2 -RGO materials are used for investigation of Li-ion insertion properties, which show a reversible capacity of 235 mA h g(-1) at 200 mA g(-1) and 150 mA h g(-1) at 1000 mA g(-1) after 1000 cycles. The higher specific surface area of the new mesostructures and high conductive substrate (RGO nanosheets) result in excellent lithium storage performance, high-rate performance, and strong cycling stability of the TiO2 -RGO composites.

show abstract

“…In contrast, the discharge capacity of the pure LTO nanosheet drops rapidly to 83.1 mA h g À1 after 1000 discharge/charge cycles at the same rate, and the corresponding capacity retention is only 69.3%. The current research was also compared with other LTO-based, high rate electrodes in previous studies, including LTO-anatase TiO 2 composites, 11,13,[21][22][23][24] surface modified LTO, [35][36][37] nanostructured LTO, [38][39][40][41] and ion-doped LTO, 42,43 and these results are shown in Table 1. By comparison, the high rate cycling performance of the LTO-RTO electrode is comparable to that of the La-doped LTO and remarkably better than those of other LTO-based electrodes.…”

Section: Electrochemical Characterizationmentioning

confidence: 98%

“…44 It is thought that the nebulous substance covering the cycled LTO nanosheets is the product of side reactions with the electrolyte. So, it can be inferred that the in situ generated nanosized 34 154 after 100 cycles at 5 C 91 LiCrTiO 4 /MWCNT 35 115 after 200 cycles at 10 C 96 Carbon coated LTO 36 104 after 500 cycles at 10 C 90 Mesoporous LTO 37 120 after 300 cycles at 5 C 88 LTO nanoclusters 38 122 after 100 cycles at 5 C 88 Mesoporous LTO 39 144 after 200 cycles at 10 C 91 Core-shell LTO 40 131 after 1000 cycles at 10 C 95 Cu 2+ doped LTO 41 112 after 100 cycles at 10 C 98 La-doped LTO 42 140 after 1000 cycles at RTO sheets in the LTO-RTO electrode may play an important role in inhibiting the occurrence of side reactions during long-term electrochemical charge/discharge cycling. However, the mechanism is still unclear, and more work needs to be carried out.…”

Section: Electrochemical Characterizationmentioning

confidence: 99%

A Li₄Ti₅O₁₂–rutile TiO₂ nanocomposite with an excellent high rate cycling stability for lithium ion batteries

Mao

2015

New J. Chem.

View full text Add to dashboard Cite

A lithium titanate (Li 4 Ti 5 O 12 )-rutile titanium dioxide (TiO 2 ) nanocomposite was synthesized using a solhydrothermal synthesis method using lithium hydroxide monohydrate and titanium(IV) t-butoxide as precursors. The material obtained exhibited a micron-sized flower-like morphology (3 mm to 4 mm) consisting of layer-stacked nanosheets. In the composite material, nanosized rutile TiO 2 sheets were generated in situ and adhered on to the Li 4 Ti 5 O 12 sheets. These nanosized rutile TiO 2 sheets in the Li 4 Ti 5 O 12 -rutile TiO 2 composite play an important role in producing numerous Li 4 Ti 5 O 12 /rutile TiO 2 two-phase interfaces which act as tiny reaction sites for rapid lithium intercalation and extraction, for inhibiting the side reactions with electrolyte, and avoiding the aggregation of primary nanosheets during the long-term cycling process. Benefiting from these unique features, the Li 4 Ti 5 O 12 -rutile TiO 2 composite exhibits excellent rate capability (a reversible capacity of 148, 146 and 142 mA h g À1 at 5, 10 and 20 C, respectively, 1 C = 175 mA g À1 ) and outstanding long-term cycling stability (only 6.3% capacity loss after 1000 cycles at a high rate of 10 C).

show abstract

Mesoporous Spherical Li₄Ti₅O₁₂ as High‐Performance Anodes for Lithium‐Ion Batteries

Cited by 8 publications

References 30 publications

Synthesis and electrochemical performance of Li₄Ti₅O₁₂/TiO₂/C nanocrystallines for high-rate lithium ion batteries

Synthesis and electrochemical performance of Li₄Ti₅O₁₂/TiO₂/C nanocrystallines for high-rate lithium ion batteries

Reduced Graphene Oxide‐Supported TiO₂ Fiber Bundles with Mesostructures as Anode Materials for Lithium‐Ion Batteries

A Li₄Ti₅O₁₂–rutile TiO₂ nanocomposite with an excellent high rate cycling stability for lithium ion batteries

Contact Info

Product

Resources

About

Mesoporous Spherical Li4Ti5O12 as High‐Performance Anodes for Lithium‐Ion Batteries

Cited by 8 publications

References 30 publications

Synthesis and electrochemical performance of Li4Ti5O12/TiO2/C nanocrystallines for high-rate lithium ion batteries

Synthesis and electrochemical performance of Li4Ti5O12/TiO2/C nanocrystallines for high-rate lithium ion batteries

Reduced Graphene Oxide‐Supported TiO2 Fiber Bundles with Mesostructures as Anode Materials for Lithium‐Ion Batteries

A Li4Ti5O12–rutile TiO2 nanocomposite with an excellent high rate cycling stability for lithium ion batteries

Contact Info

Product

Resources

About

Mesoporous Spherical Li₄Ti₅O₁₂ as High‐Performance Anodes for Lithium‐Ion Batteries

Synthesis and electrochemical performance of Li₄Ti₅O₁₂/TiO₂/C nanocrystallines for high-rate lithium ion batteries

Synthesis and electrochemical performance of Li₄Ti₅O₁₂/TiO₂/C nanocrystallines for high-rate lithium ion batteries

Reduced Graphene Oxide‐Supported TiO₂ Fiber Bundles with Mesostructures as Anode Materials for Lithium‐Ion Batteries

A Li₄Ti₅O₁₂–rutile TiO₂ nanocomposite with an excellent high rate cycling stability for lithium ion batteries