ELECTROCHIMICA ACTA
·
2017
·
IF 4.798
Chunfu Lin,Lei Hu,Chuanbing Cheng,Kai Sun,Xingkui Guo,Qian Shao,Jianbao Li,Ning Wang,Zhanhu Guo
Although with a large capacity, TiNb 2 O 7 as an anode material of lithium-ion batteries suffers from a poor rate capability. To solve this challenge, nano-TiNb 2 O 7 and its carbon nanotube (CNT) nanocomposites were prepared by direct hydrolysis of TiNb 2 O 7 /CNTs suspension followed by calcination in air and N 2 , respectively. The TiNb 2 O 7 nanoparticles in the composites have a Ti 2 Nb 10 O 29 -type crystal structure with O 2− vacancies and lower-valence cations, leading to improved Li + -ion diffusion coefficient and increased electronic conductivity in TiNb 2 O 7 . The evenly distributed CNTs have good contact with the TiNb 2 O 7 particles, thereby reducing their particle sizes and improving the electrical conduction. As a result of these improvements, the nanocomposites present outstanding electrochemical performances. For example, it delivers a large reversible capacity (346 mAh g −1 at 0.1 C) and a prominent rate capability (still 163 mAh g −1 at the ultra-large current rate of 30 C). Exceptional cyclic stability is also demonstrated with over 100 cycles at 10 C with large capacity retention of 97.6%. These results reveal that the nano-TiNb 2 O 7 /CNTs composites can be a promising anode material for lithium-ion batteries of electric vehicles.
研究领域:
材料科学
·
能源存储
✓ 已验证
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2019
·
IF 5.155
Haoyang Li,Yang Zhang,Yakun Tang,Fei Zhao,Bowei Zhao,Yuanfang Hu,Haysar Murat,Shasha Gao,Lang Liu
TiNb 2 O 7 nanowires (TNS) were synthesized by using a simple sol-gel method combined with subsequent calcination process. As anodes of lithium-ion batteries, TNS exhibit a specific capacity of 199.6 mAh g −1 after 500 cycles at 0.4 A g −1 and satisfactory coulombic efficiency of 98.7% after 2000 cycles at 5 A g −1 . Compared with TiNb 2 O 7 nanoparticles (TN), TNS have excellent electrochemical performances due to the 1D materials assembled from uniform and dense TiNb 2 O 7 nanoparticles (∼35 nm). The 1D linear structural electrode gathered the merits of tiny nanoparticles, multiple active sites, short electronic transport path and excellent dynamics orientation, which are responsible for the favorable electrochemical properties.
研究领域:
材料科学
·
能源存储
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2025
·Vol. 60
·期 6
·3014-3025
·
IF 3.9
Cheng Li-Qian,Pan Jingye,Chen Kai,Hao Xuxia,Xie Xinyuan,Dong Xinrui,Wang Zixuan,Liu Ruiping,Feng Ming
TiNb 2 O 7 (TNO) is a promising anode for lithium-ion batteries owing to its high theoretical capacity, minimal volume expansion, and effective suppression of lithium dendrite formation. Nonetheless, the low electrical conductivity of TNO presents a barrier to practical application. Thus, a Mo 6+ doping strategy was utilized to address the conductivity issue, and TNO- x Mo ( x = 0, 0.05, 0.10, 0.15, 0.20) anodes were prepared by a solid-state method. The incorporation of Mo 6+ ions result in a charge redistribution, which can elevate electronic conductivity and accelerate ion diffusion. What’s more, by precisely controlling the Mo 6+ ion concentration can regulate the morphologies of the TNO, enabling it to expose more fast-ion conducting (020) facets. The synergistic effect of the above two factors significantly enhances the conductivity and electrochemical properties of the TNO anode. As a result, the optimal TNO-0.05Mo with 2D lamellar structure exhibits a high discharge capacity of 347.6 mAh g −1 at 0.1C, superior rate performance, and an excellent cycle lifespan, with retention of 78% after 1500 cycles at 1.5C/1.5C. Meanwhile, the solid-state battery with TNO-0.05Mo as anode also displays improved rate and cycle performance than the liquid-state battery, indicating the great application potential for the next-generation energy storage devices.
研究领域:
材料科学
·
能源存储技术
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2021
·
IF 8.128
Yang Li,Yan Wang,Rui Cai,Cuiping Yu,Jianfang Zhang,Jingjie Wu,Chandra S Tiwary,Jiewu Cui,Yong Zhang,Yucheng Wu
Lithium ion hybrid capacitors (LIHCs) have a capacitor-type cathode and a battery-type anode and are a prospective energy storage device that delivers high energy/power density. However, the kinetic imbalance between the cathode and the anode is a key obstacle to their further development and application. Herein, we prepared TiNb 2 O 7 nanoparticles through a facile solvothermal method and annealing treatment. Then a homogeneous three-dimensional (3D) self-supported reduced graphene oxide (rGO)-coated TiNb 2 O 7 (TiNb 2 O 7 /rGO) nanocomposite was constructed by freeze-drying, followed by a high-temperature reduction, which demonstrates an enhanced pseudocapacitive lithium ions storage performance. Benefiting from the improved electrical conductivity , ultrashort ions diffusion paths, and 3D architecture, the TiNb 2 O 7 /rGO nanocomposite exhibits a high specific capacity of 285.0 mA h g −1 , excellent rate capability (73.6% capacity retention at 8 A g −1 ), and superior cycling stability. More importantly, quantitative kinetics analysis reflects that the capacity of TiNb 2 O 7 /rGO is mainly dominated by capacitive behavior, making it perfectly match with the capacitor-type activated carbon (AC) cathode. By using pre-lithiated TiNb 2 O 7 /rGO as anode material and AC as cathode material , a high-rate TiNb 2 O 7 /rGO//AC LIHC device can be fabricated, which delivers an ultrahigh energy density of 127 Wh kg −1 at the power density of 200 W kg −1 , a maximum power density of 10 kW kg −1 at the energy density of 56.4 Wh kg −1 , and durable service life.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMISTRY-A EUROPEAN JOURNAL
·
2018
·Vol. 24
·期 49
·12932-12937
·
IF 5.16
Guozhen Zhu,Qing Li,Renchao Che
Graphical On the ball : The high charge/discharge voltage (1.65 V), long life span, and excellent reversibility of TiNb 2 O 7 have led to its use as an anode for lithium ion batteries. In order to overcome its inherent poor electronic conductivity, it is herein formed as hollow spheres, and coated with carbon, resulting in a much-improved anode performance. TiNb 2 O 7 , with high charge/discharge voltage (1.65 V), long life span, and excellent reversibility has become a new anode material for lithium ion batteries in recent years. However, the inherent poor electronic conductivity strictly limits its practical applications. Herein, we report for the first time hollow TiNb 2 O 7 @C spheres, with carbon spheres as sacrificial template. The special hollow structure can effectively relieve the volume expansion during the repeated process of charging/discharging. The conductivity of hollow TiNb 2 O 7 spheres can be greatly improved by the carbon layers uniformly coated outside the surface of TiNb 2 O 7 spheres. Besides, the particle aggregation can be conspicuously suppressed by the uniformly coated carbon layers. As a result, hollow TiNb 2 O 7 @C spheres show a prominent charge/discharge capacity of 282.6/283.8 mAh g −1 after 100 cycles at 0.25 C (1 C=388 mA g −1 ), revealing the excellent cycle performance and high reversible capacity. Meanwhile, the charge/discharge capacity of 157.5 and 157.9 mAh g −1 can be maintained at 10 C after 10 cycles. The facial synthetic method can be extended to prepare various materials with volume expansion during repeated charging/discharging process.
研究领域:
材料科学
·
能源存储与转换
✓ 已验证
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2019
·
IF 5.383
Yupeng Zhang,Mengqi Zhang,Yangyang Liu,He Zhu,Lei Wang,Yang Liu,Mei Xue,Bo Li,Xutang Tao
TiNb 2 O 7 compound with extra oxygen vacancies is synthesized through unique supercritical fluid process. When fabricated as anode for lithium ion batteries, such TiNb 2 O 7 anode exhibits high initial discharge capacity of 231 mA h g −1 at a current density of 100 mA g −1 , and maintains capacity of 169 mA h g −1 even after 250 cycles in the voltage window of 1.0–3.0 V. The excellent electrochemical performance is mainly attributed to the existence of abundant oxygen vacancies in TiNb 2 O 7 compound, which greatly increases the electronic conductivity and lithium ion diffusion coefficient . Furthermore, the contribution of pseudocapacitive effect to the superior electrochemical performance of as-prepared Ti Nb 2 O 7 is investigated systematically. All in all, it demonstrates that the supercritical fluid is a facile and effective media to create oxygen vacancies in TiNb 2 O 7 , and the TiNb 2 O 7 compound with introduced oxygen vacancies would be a promising candidate for anode materials in high-power lithium ion batteries . This work provides a fresh strategy and route to explore novel multicomponent oxide materials with enhanced electrochemical properties for energy storage.
研究领域:
材料科学
·
能源存储
✓ 已验证
DOI
高影响因子
ChemElectroChem
·
2019
·Vol. 6
·期 15
·3959-3965
·
IF 3.975
Min Liu,Houcai Dong,Shuo Zhang,Xi Chen,Yiping Sun,Shan Gao,Jiaqiang Xu,Xiaodong Wu,Anbao Yuan,Wei Lu
Graphical Powerful microspheres : A spherical nano-TiNb 2 O 7 /CNT-KB composite material with a 3D hierarchical heterostructure fabricated by spray drying and solvothermal method is presented. The material is characterized as an anode for lithium-ion batteries demonstrating superior electrochemical performance in terms of reversible charge specific capacity, high rate, and long-term cycling performance compared to bare TiNb 2 O 7 . Nano-TiNb 2 O 7 /multiwalled carbon nanotube and ketjen black (TiNb 2 O 7 /CNT-KB) composite microspheres with porous three-dimensional (3D) hierarchical heterostructure are fabricated by spray drying and solvothermal method. This composite material exhibits a high reversible charge specific capacity of 327.8 mAh g −1 at the current rate of 0.1 C and 151.1 mAh g −1 at 20 C rate. When it is cycled at a high current rate of 5 C for 1000 cycles, the charge capacity is dropped from the maximum value of 220.8 mAh g −1 (6 th cycle) to the end value of 145.4 mAh g −1 , with capacity retention of 65.9 %. The TiNb 2 O 7 /CNT-KB composite material demonstrates much superior electrochemical performance over the bare TiNb 2 O 7 material, and this result should be attributed to its particular porous 3D hierarchical structure, which possesses enhanced electrical conductivity as well as the ability for accommodating volume change and preventing particle aggregation of the electrode active material during the discharge and charge cycles.
研究领域:
材料科学
·
能源存储与转换
✓ 已验证
DOI
高影响因子
Frontiers in Energy Research
·
2021
·
IF 4.008
Hu Lei,Yang Xulai,Chen Yumeng,Wang Lili,Li Jiajia,Tang Yujie,Zhang Haitao
TiNb2O7 (TNO) compound has been pursued tremendously due to its high theoretical capacity, high potential, and excellent cycle stability. Unfortunately, an intrinsic low electronic and ionic conductivity feature has restricted its broad applications in electrochemical energy storage fields. Two-dimensional (2D) nanostructures can effectively shorten Li-ion transport path and enhance charge transfer. Here, hierarchical structure TNO was constructed by using ethanol and acetic acid as particularly important organic chemicals of basic raw materials via a simple solvothermal reaction. Ethanol was found to play a critical role in the formation of 2D sheet structure. Meantime, reduced graphene oxide nanosheets can effectively improve electronic conductivity. As-obtained TiNb2O7 were wrapped further by graphene oxide nanosheets through a flocculation process. Their unique structure is beneficial to the final electrochemical performance. This study not only provides a general approach for the design of novel 2D nanomaterials wrapped by graphene because of the advantage of esterification reaction and flocculation reaction, but also improves the electronic and ionic conductivity simultaneously.
研究领域:
材料科学
·
能源存储
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Energy Materials
·
2023
·
IF 6.4
Haoyang Zhao,Jun Zhang,Tianqi Yang,Zheyu Jin,Xinping He,Zhongwei Wang,Yang Xia,Yao Wang,Xinyong Tao,Wenkui Zhang
Aqueous lithium-ion batteries (ALIBs) are attracting intense attention because of the intrinsic nonflammable nature of the aqueous electrolytes. However, its own narrow electrochemical window has led to numerous problems such as dissolution of electrode materials, hydrogen evolution at the anode, and poor cycling stability. Here, we report an “overcrowded electrolyte” using 1,4-dioxane as an additive, which has lone pairs of electrons on the oxygen atom to disrupt the original water-hydrogen bonding network by forming intermolecular hydrogen bonds, thereby inhibiting the hydrogen evolution reaction (HER) and decreasing the water activity. Furthermore, a layer of crystalline Li2CO3 is coated onto the surface of the TiNb2O7 anode material by supercritical fluid CO2 technology. The dense hydrophobic Li2CO3 coating layer can serve as a physical protection, which effectively blocks the direct contact between electrolyte and electrode. Under the synergistic effect of those two aspects, HER is greatly suppressed and the interface stability is enhanced. As a result, LiMn2O4/TiNb2O7 full cells exhibit a high initial coulomb efficiency of 95% with a capacity retention rate of 92% over 500 cycles under 1 C rate. This work provides a fundamental understanding of the interfacial chemistry of ALIBs and makes an important step forward in the development of high-performance and low-cost ALIBs for practical applications.
研究领域:
电化学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
Nano Research
·
2020
·Vol. 14
·期 1
·148-156
·
IF 8.183
Zhang Lingchao,Wang Ke,Liu Yongfeng,Zhang Xin,Hu Jianjiang,Gao Mingxia,Pan Hongge
Critical limitations in applying MgH 2 as a hydrogen-storage medium include the high H 2 desorption temperature and slow reaction kinetics. In this study, we synthesized hierarchical porous TiNb 2 O 7 spheres in micrometer scale built with 20–50 nm nanospheres, which showed stable activity to catalyze hydrogen storage in MgH 2 as precursors. The addition of 7 wt.% TiNb 2 O 7 in MgH 2 reduced the dehydrogenation onset temperature from 300 to 177 °C. At 250 °C, approximately 5.5 wt.% H 2 was rapidly released in 10 min. Hydrogen uptake was detected even at room temperature under 50 bar hydrogen; 4.5 wt.% H 2 was absorbed in 3 min at 150 °C, exhibiting a superior low-temperature hydrogenation performance. Moreover, nearly constant capacity was observed from the second cycle onward, demonstrating stable cyclability. During the ball milling and initial de/hydrogenation process, the high-valent Ti and Nb of TiNb 2 O 7 were reduced to the lower-valent species or even zero-valent metal, which in situ created multivalent multielement catalytic surroundings. A strong synergistic effect was obtained for hybrid oxides of Nb and Ti by density functional theory (DFT) calculations, which largely weakens the Mg-H bonding and results in a large reduction in kinetic barriers for hydrogen storage reactions of MgH 2 . Our findings may guide the further design and development of high-performance complex catalysts for the reversible hydrogen storage of hydrides.
研究领域:
材料科学
·
催化
·
氢储存
✓ 已验证
DOI
高影响因子
Functional Materials Letters
·
2017
·
IF 1.234
Lei Hu,Chunfu Lin,Changhao Wang,Chao Yang,Jianbao Li,Yongjun Chen,Shiwei Lin
TiNb 2 O 7 nanorods have been successfully fabricated by a sol–gel method with a sodium dodecyl surfate (SDS) surfactant. X-ray diffraction indicates that the TiNb 2 O 7 nanorods have a Ti 2 Nb 1 0 O 2 9 -type crystal structure. Scanning electron microscopy (SEM) and transmission electron microscopy (TEM) results show that the nanorods have an average diameter of ∼ 100 nm and an average length of ∼ 300 nm. As a result of such nanosizing effect, this new material exhibits advanced electrochemical performances in terms of specific capacity, rate capability and cyclic stability. At 0.1 C, it delivers a large first-cycle discharge/charge capacity of 337/279 mAh g − 1 . Its capacities remain 248, 233, 214, 182, 154 and 122 mAh g − 1 at 0.5, 1, 2, 5, 10 and 20 C, respectively. After 100 cycles, its capacity at 10 C remains 140 mAh g − 1 with large capacity retention of 91.0%.
研究领域:
材料科学
·
电化学
·
纳米技术
·
电池技术
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2020
·
IF 10.652
Meng Yao,Ao Liu,Chunxian Xing,Bosen Li,Shanshan Pan,Jiahe Zhang,Peipei Su,Haitao Zhang
Supercapacitors have emerged as appealing alternatives to rechargeable energy storage devices in renewable energy generation and storage systems due to their ultra-high power characteristics. However, their broad applications are hindered by their low energy density characteristic. Therefore, the designs of electrodes with high rate and high specific capacitance and electrolytes with wide-potential window are extremely crucial. A novel core–shell heterostructure, TiNb 2 O 7 as the core and C-encapsulated MoS 2 as the shell, was demonstrated. As a result of synergistic effects induced by the core–shell heterostructure, this nanoarchitectural anode exhibited a high rate capability and an excellent cyclic stability, 99% capacity was retented after 500 cycles. Moreover, a nanocomposite ionogel electrolyte composed of ionic liquid (IL), poly(vinylidene fluoride-co-hexafluoropropene)-hexafluoropropylene (PVDF-HFP) and SiO 2 was prepared. In our study, optimized solid lithium-ion capacitors (SLICs) exhibited an impressive energy density of 147.2 Wh kg −1 at 60 °C and an outstanding ultra-long term stability, 93.7% capacity was retented after 10,000 cycles at 1 A g −1 . These outstanding performances could be ascribed to the widened potential window and remarkable ionic conductivity of the ionogel electrolyte. The effective combination of nanoarchitectural anodes and a nanocomposite ionogel provides a novel and profound direction for the fabrication of highly safe and reliable solid lithium-ion capacitors with an enhanced high energy density.
研究领域:
能源存储
·
材料科学
·
电化学
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）