ACS Applied Energy Materials
·
2021
·
IF 6.024
Weiwei Liu,Jing Liu,Menghua Zhu,Wenyu Wang,Yongming Sun
The fast-charging capability of lithium-ion batteries (LIBs) is becoming more important than before to meet the increasing requirements in practical applications. Because of safe working potential (above 1 V) and moderately high specific capacity, titanium niobium oxide (TiNb2O7, TNO) shows great potential as a fast-charging anode. Herein, a TNO-C assembly consisting of active initial TNO nanoparticles with conformal carbon coating is fabricated. The small size of TNO nanoparticles provides a short diffusion distance for lithium ions, and surficial carbon layers enable good electronic conductivity within the entire assembly. Moreover, the compact structure within the TNO assembly and efficient space packing of spheroidal secondary particles are beneficial for close packing, leading to an overall short distance for electron transport and ion diffusion. As expected, the as-designed TNO-C electrode delivers a high capacity of 194 mAh g–1 under 10C, and 71% of capacity was achieved under 0.2C. Moreover, the TNO-C electrode shows stable cycling performance with capacity retention of 92.2% after 100 cycles under 2C. In addition, by pairing with a lithium nickel–cobalt manganate (LiNi0.6Co0.2Mn0.2O2, NCM) cathode, the full cell exhibits a high capacity of 140 mAh g–1 under 3C and a high capacity retention of 97.4% after 100 cycles. The rational design of a TNO-C assembly makes it an excellent anode candidate for fast-charging LIBs.
研究领域:
材料科学
·
电化学
·
能源存储
·
纳米科技
·
固态化学
·
电池技术
✓ 已验证
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2019
·
IF 6.361
Jianbo Wu,Guoxiang Pan,Wenwu Zhong,Liang Yang,Shengjue Deng,Xinhui Xia
Controllable fabrication of advanced electrode materials is critical for the development of lithium ion batteries (LIBs). Herein, for the first time, we report novel hierarchical porous chromium niobium oxide (Cr 0.5 Nb 24.5 O 62 ) microspheres prepared by a facile one-step solvothermal method. The as-prepared Cr 0.5 Nb 24.5 O 62 microspheres present 3D hierarchical porous structure consisting of cross-linked nanoparticles, high electronic conductivity and large specific surface area. Accordingly, the Cr 0.5 Nb 24.5 O 62 microspheres show noticeable lithium ion storage performance with superior high-rate capability (199 mAh g −1 at 20C) and good cycling stability with a capacity retention of 95% over 1000 cycles, much better than the bulk Cr 0.5 Nb 24.5 O 62 and TiNb 24 O 62 counterparts. Our work demonstrates a new high-rate electrode material for high-power energy storage.
研究领域:
材料科学
·
电化学
·
能源存储
·
纳米材料
·
无机化学
✓ 已验证
DOI
高影响因子
Nano Energy
·
2017
·
IF 12.343
Haoxiang Yu,Hua Lan,Lei Yan,Shangshu Qian,Xing Cheng,Haojie Zhu,Nengbing Long,Miao Shui,Jie Shu
Hollow microstructure always exhibits some special properties in the field of electrochemistry . Here, this study reports the rational design and preparation of TiNb 2 O 7 nanofibers with one dimensional hollow structure via co-electrospinning. The as-electrospun TiNb 2 O 7 hollow nanofibers show high intercalation potential, low charge-charge resistance and fast electrochemical kinetics . The electrochemical results exhibit that the TiNb 2 O 7 hollow nanofibers deliver a reversible capacity of 210.1 mAh g −1 after 150 cycles at a current rate of 0.4 C, and 158.4 mAh g −1 after 900 cycles even at a current rate of 10 C with an outstanding capacity retention of 80.6%. The excellent electrochemical performance of nanofibers can be related to the unique morphology of hollow structure. Furthermore, the lithium ions storage mechanism of TiNb 2 O 7 hollow nanofibers is also systematically analyzed, which is related to one two-phase coexistence and two solid-solution processes during the whole charge-discharge cycle. In addition, it is also demonstrated by in situ and ex situ observations that TiNb 2 O 7 hollow nanofibers have outstanding structural stability and electrochemical reversibility. Therefore, the TiNb 2 O 7 hollow nanofibers can be applied as an alternative promising electrode material for the next rechargeable lithium ions batteries .
研究领域:
材料科学
·
电化学
·
纳米科技
·
能源存储
·
无机功能材料
✓ 已验证
DOI
高影响因子
Energy Storage Materials
·
2020
·
IF 16.28
Qingfeng Fu,Xiangzhen Zhu,Renjie Li,Guisheng Liang,Lijie Luo,Yongjun Chen,Yuanli Ding,Chunfu Lin,Kuikui Wang,Xiu Song Zhao
M–Nb–O compounds are regarded as advanced anode materials of lithium-ion batteries owing to their large capacities, high safety and fast Li + transport. However, challenges remain in the exploitation of new M–Nb–O compounds with low strains to enable superior cyclability. Here, we exploit V 3 Nb 17 O 50 as a low-strain M–Nb–O anode compound, and V 3 Nb 17 O 50 micron-sized particles (V 3 Nb 17 O 50 -MP) and submicron-sized rods (V 3 Nb 17 O 50 -SR) are demonstrated. V 3 Nb 17 O 50 owns an open and robust shear ReO 3 crystal structure, which is constructed by 3 × 3 × ∞ (V,Nb)O 6 octahedron-blocks linked by VO 4 tetrahedra. The resulting A–B–A layered structure with a large interlayer spacing enables the superior Li + diffusivity and significant intercalation-pseudocapacitive behavior in V 3 Nb 17 O 50 . The maximum unit-cell volume expansion of V 3 Nb 17 O 50 discharged to 0.8 V is only 3.46% (the smallest value among the known M–Nb–O anode compounds with shear ReO 3 structures), leading to the excellent cyclability of V 3 Nb 17 O 50 -MP/V 3 Nb 17 O 50 -SR with 90.0/91.8% capacity retention over 2000 cycles at 10C. V 3 Nb 17 O 50 -MP/V 3 Nb 17 O 50 -SR further exhibits a safe operating potential of 1.736/1.724 V, large reversible capacity of 207/254 mA h g −1 at 0.1C, and high rate performance with 68/123 mA h g −1 at 10C. A LiMn 2 O 4 //V 3 Nb 17 O 50 -SR full cell also exhibits comprehensively good electrochemical properties , including excellent cyclability with 85.7% capacity retention over 500 cycles at 5C. Therefore, V 3 Nb 17 O 50 can be a very promising anode compound for stable, safe, large-capacity and fast-charging Li + storage.
研究领域:
材料科学
·
电化学
·
能源存储
·
无机化学
·
纳米结构材料
·
固态化学
✓ 已验证
DOI
高影响因子
Journal of Materiomics
·
2023
·Vol. 10
·期 5
·995-1003
·
IF 9.4
Wei Peng,Jianglei Chang,Jianwei Zhao,Dawei Wang,Zhen Liu,Genshui Wang,Shuxiang Dong
Piezoelectric PZT ceramics with high piezoelectric properties and good thermal stability are urgently desired concerning the practical application. New compositions of LiNbO 3 modified Pb(Ni 1/3 Nb 2/3 )O 3 PbZrO 3 PbTiO 3 ceramics have been prepared in this study. The effects of the introduction of the LiNbO 3 on the system were comprehensively investigated in terms of the phase structure, microstructure, electric properties, and thermal stability behavior of the ceramics. All compositions are located in the morphotropic phase boundary (MPB) region, and the ratio of the rhombohedral (R) phase increases obviously with the increase of LiNbO 3 concentration. With increasing the LiNbO 3 content, the piezoelectric properties were significantly enhanced. The sample added with 2% (in mole) LiNbO 3 shows excellent electric properties, including T m = 185 °C, ε r = 5,643, k p = 0.626, Q m = 51, d 33 = 902 pC/N. More importantly, no thermal depolarization behavior was observed in the temperature range of 25–100 °C. For PNN-PZT- x %LN ceramics, which is mainly attributed to the pinning effect resulted by the Li Pb ' − Nb Zr/Ti ∙ defect dipoles.
研究领域:
材料科学
·
功能陶瓷
·
压电材料
·
固态物理
·
电子材料
✓ 已验证
DOI
高影响因子
MATERIALS & DESIGN
·
2017
·
IF 4.364
Puhong Wen,Lili Ai,Fenyan Wei,Dengwei Hu,Jingjing Guo,Fangyi Yao,Taotao Liu
The crystalline hexagonal Nb 2 O 5 (H-Nb 2 O 5 ) nanobelt clusters dominantly exposed (− 110) facet are firstly synthesized by a hydrothermal topological reaction with a precursor of fiber-like K 2 Nb 2 O 6 ·H 2 O. The structure and morphology of samples obtained at different temperatures and times are investigated. There are two steps in the synthesis process. One is the acid-exchanging reaction transforming into amorphous phase protonated niobate (HNO), and the other is dehydration reaction transforming into H-Nb 2 O 5 , and simultaneous dissolution reaction which forms nanobelt cluster morphology from the fiber-like particle. The formation mechanism of H-Nb 2 O 5 nanobelt clusters has been proposed in detail. After photo-reduced reaction between the H-Nb 2 O 5 nanobelt clusters and AgNO 3 solution, the dominantly exposed (− 110) facet of H-Nb 2 O 5 nanobelt is homogeneously covered by Ag nanoparticles . The photo-electrochemical performance of the obtained H-Nb 2 O 5 nanobelt clusters and Ag deposited H-Nb 2 O 5 (Ag-Nb 2 O 5 ) nanobelt clusters as photocatalysts are evaluated by splitting water under simulated sunlight illumination, and the generated photocurrent of Ag-Nb 2 O 5 sample is 10.73 μA, which is 535 times that of the H-Nb 2 O 5 sample. The results demonstrate that the Ag-Nb 2 O 5 nanobelt clusters have a high photo-electrochemical performance as well as good sunlight photoelectric conversion efficiency.
研究领域:
材料科学
·
纳米科技
·
光催化
·
能源化学
·
半导体材料
·
电化学
·
太阳能转换
✓ 已验证
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2023
·Vol. 50
·期 4
·6598-6605
·
IF 5.2
Wei Peng,Jianglei Chang,Bin Wang,Zhen Liu,Genshui Wang,Shuxiang Dong
The ultrahigh piezoelectric coefficient (d 33 ≥ 1000 pC/N) exhibited by piezoelectric Pb(Zr,Ti)O 3 (PZT) ceramics not only captivates researchers but also holds considerable practical value across various applications. While significant progress has been made in enhancing piezoelectricity of PZT-based ceramics, novel mechanisms need to be proposed to explain the piezoelectric behavior of new systems with ultrahigh d 33 . In this study, we initially employ LiNbO 3 as an additive to enhance the piezoelectric properties of the Pb(Ni 1 / 3 Nb 2 / 3 )O 3 –PbZrO 3 –PbTiO 3 ceramics. and the optimal performance is achieved by incorporating 1.5 mol% of LiNbO 3 into the system, resulting in an ultrahigh d 33 ∼1178 pC/N ( d 33 * ∼1560 p.m./V (@ E = 5 kV/cm)). The corresponding mechanism for this superior piezoelectric response involves the AB-site co-doping effect, especially the ( Li Pb ′ − Nb Zr / Ti ∙ ) defect dipoles formed by the introduction of LiNbO 3 . In particular, the addition of LiNbO 3 leads to a more uniform distribution of domain sizes, thereby further enhancing the ultrahigh piezoelectricity. These findings pave the way for a deeper under-standing of the origin of ultrahigh piezoelectric properties and make substantial contributions to the advancement of piezoelectric materials for practical applications in electromechanical devices.
研究领域:
材料科学
·
功能陶瓷
·
压电材料
·
固态物理
·
电子显微学
·
介电材料
·
无机非金属材料
✓ 已验证
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2022
·
IF 9.965
Jujun Yuan,Xiaofan Li,Jun Liu,Shiyong Zuo,Xiaokang Li,Fangkun Li,Yunfei Gan,Haishan He,Xijun Xu,Xianke Zhang,Junxia Meng
The distinctive pomegranate-like Nb 2 O 5 /Carbon@ N -doped carbon (Nb 2 O 5 /C@NC) composites are fabricated using hydrothermal method integrated with nitrogen doped carbon coating procedure. For the SIBs anode, the Nb 2 O 5 /C@NC composites present superior rate character and sustainable capacity (117 mAh g −1 upon 1000 cycles at 5 A g −1 ). The in-situ X-ray diffraction (XRD) is utilized to research its sodium storage mechanism. Furthermore, for PIBs, the Nb 2 O 5 /C@NC composites present sustainable capacity (81 mAh g −1 upon 1000 cycles at 1 A g −1 ). The outstanding performance of Nb 2 O 5 /C@NC composites is ascribed to its unique architecture, in which Nb 2 O 5 nanocrystals embedded in porous carbon can restrain agglomeration of Nb 2 O 5 nanocrystals, enhance electron/ion diffusion kinetics , and ensure electrolyte accessibility, and moreover, NC shell layer can provide effective active sites and further increase ions/electrons transfer.
研究领域:
材料科学
·
电化学
·
纳米能源材料
·
储能技术
·
先进电池
✓ 已验证
DOI
高影响因子
RARE METALS
·
2023
·Vol. 43
·期 3
·1153-1166
·
IF 8.8
Lu Li-Wen,Luo Hui,Li Guang-Xu,Li Yun,Wang Xin-Hua,Huang Cun-Ke,Lan Zhi-Qiang,Zhou Wen-Zheng,Guo Jin,Ismail Mohammad,Liu Hai-Zhen
The Li-Mg-B-H composite (2LiBH 4 + MgH 2 ) has a high capacity of 11.4 wt% as a hydrogen storage material. However, the slow kinetics and poor cycling stability severely restrict its practical applications. In this work, a layered Nb 2 C MXene was first synthesized and then introduced to tailor the kinetics and cycling stability of the Li-Mg-B-H composite. The milled 2LiH + MgB 2 composites were initially hydrogenated to obtain the 2LiBH 4 + MgH 2 composites. The 2LiBH 4 + MgH 2 + 5 wt% Nb 2 C can release 9.0 wt% H 2 in 30 min at 400 °C, while it is only 2.7 wt% for the undoped 2LiBH 4 + MgH 2 . The dehydrogenation activation energies of MgH 2 and LiBH 4 are 123 and 154 kJ·mol −1 respectively for the 5 wt% Nb 2 C-doped composite, lower than the undoped composite (164 and 165 kJ·mol −1 ). The 2LiBH 4 + MgH 2 + 5 wt% Nb 2 C possesses excellent cycling stability, with the reversible capacity only slightly reduced from 9.4 wt% for the 1st cycle to 9.3 wt% for the 20th cycle. Nb 2 C keeps stable in the composite and acts as an efficient catalyst for the Li-Mg-B-H composite. It is believed that both the layered structure and the active Nb element contribute to the enhanced hydrogen storage performances of the Li-Mg-B-H composite. This work confirms that the Nb 2 C MXene with layered structure has a significant enhancing impact on the Li-Mg-B-H hydrogen storage materials, which is different from the bulk NbC. Graphical abstract
研究领域:
材料科学
·
能源化学
·
纳米催化
·
储氢技术
·
固体化学
✓ 已验证
DOI
高影响因子
Green Energy & Environment
·
2021
·Vol. 8
·期 2
·589-600
·
IF 8.207
Liuting Zhang,Farai Michael Nyahuma,Haoyu Zhang,Changshan Cheng,Jiaguang Zheng,Fuying Wu,Lixin Chen
Nb 2 O 5 nanoparticles with an average particle size of 10 nm supported on a rhombic dodecahedral metal organic framework (MOF) were successfully synthesized by a facile one-pot hydrothermal reaction and subsequent calcination process. Experimental results demonstrated that the prepared catalyst drastically improved the hydrogen storage behavior of MgH 2 . 7 wt% Nb 2 O 5 @MOF doped MgH 2 started to desorb hydrogen at 181.9 °C and 6.2 wt% hydrogen could be released within 2.6 min and 6.3 min at 275 °C and 250 °C, respectively. The fully dehydrogenated composite also displayed excellent hydrogenation by decreasing the onset absorption temperature to 25 °C and taking up 4.9 wt% and 6.5 wt% hydrogen within 6 min at 175 °C and 150 °C, respectively. Moreover, the corresponding activation energy was calculated to be 75.57 ± 4.16 kJ mol −1 for desorption reaction and 51.38 ± 1.09 kJ mol −1 for absorption reaction. After 20 cycles, 0.5 wt% hydrogen capacity was lost for the MgH 2 +7 wt% Nb 2 O 5 @MOF composite, much lower than 1.5 wt% of the MgH 2 +7 wt% Nb 2 O 5 composite. However, the addition of Nb 2 O 5 @MOF had limited effect on reducing the dehydrogenation enthalpy of MgH 2 . Microstructure analysis revealed that Nb 2 O 5 particles were uniformly distributed on surface of the MgH 2 matrix and synergistically improved the hydrogen storage property of MgH 2 with MOF.
研究领域:
材料科学
·
无机化学
·
纳米催化
·
能源存储
·
氢能源
·
固态储氢
✓ 已验证
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2019
·
IF 4.175
Zhendong Yao,Xuezhang Xiao,Zhaoqing Liang,Huaqin Kou,Wenhua Luo,Changan Chen,Lijun Jiang,Lixin Chen
In order to promote the application of ZrCo alloy in storage and delivery system of hydrogen isotope , Zr 1-x Nb x Co (x = 0–0.2) alloys were prepared by induction levitation melting method under argon atmosphere. The effects of Nb substitution for Zr on the microstructure, initial activation behavior, dehydrogenation thermodynamics, disproportionation behavior and cycling stability of Zr 1-x Nb x Co (x = 0–0.2) alloys were systematically investigated. The results show that all alloys contain a ZrCo main phase and a little secondary phase of ZrCo 2 . With the content of Nb increasing, the lattice parameters of ZrCo main phase decrease and the distribution of ZrCo 2 secondary phase is more uniform. It is found that the initial activation period is remarkably reduced from 87.79 h for ZrCo to 8.08 h for Zr 0.8 Nb 0.2 Co. Meanwhile, the equilibrium pressure of hydrogen desorption is enhanced from 0.197 (x = 0) to 0.85 bar (x = 0.2) at 350 °C, which is beneficial to delivery of hydrogen isotope . Further experiments exhibit that the anti-disproportionation performance and cycling stability have been greatly improved after Nb partial substitution, which could be explained by the enlargement of the apparent activation energy from 147.8 kJ/mol (ZrCo) to 182.1 kJ/mol (Zr 0.85 Nb 0.15 Co) for disproportionation reaction.
研究领域:
材料科学
·
金属功能材料
·
氢能存储
·
核化学
·
物理化学
✓ 已验证
DOI
高影响因子
NANO
·
2020
·
IF 1.566
Nan Luo,Guoliang Chen,Yunfan Shang,Suyang Lu,Jun Mei,Changyu Tang,Zhoukun He,Wenwen Zeng,Haoran Zhan
Ti 2 Nb 1 0 O 2 9 (TNO) is considered as a potential anode material due to its high capacity/power density and reliable safety. However, its poor electronic conductivity restricts its rate performance, which is important for its application in electric vehicles (EVs). In this study, we fabricated a hybrid of Ti 2 Nb 1 0 O 2 9 − x /holey-reduced graphene oxide (TNO x /HRGO) by a two-step method. In the structure of TNO x /HRGO, TNO x microspheres with oxygen vacancies are wrapped by gossamer-like HRGO. The oxygen vacancies of TNO x and the high conductivity of HRGO can effectively enhance the electronic conductivity of the TNO x /HRGO hybrid, and the HRGO holes are beneficial for the transmission of lithium-ion ( Li + ). The synergy effect of above features improves the rate performance of the TNO x /HRGO hybrid. In addition, the existence of HRGO can buffer volume expansion during the insertion processes of Li + , which can improve cyclic stability of the TNO x /HRGO hybrid. Consequently, the TNO x /HRGO electrode has excellent lithium-ion storage capacity, with high-rate performance (242 mAh/g at 10 ∘ C, 225 mAh/g at 20 ∘ C and 173 mAh/g at 40 ∘ C) and excellent cyclic stability (98.0% capacity retention after 300 cycles at 10 ∘ C). This work reveals that TNO x /HRGO can be a potential anode material for high-rate-performance lithium-ion storage.
研究领域:
材料科学
·
电化学
·
纳米科技
·
能源存储
·
固态化学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）