Journal of Energy Storage
·
2024
·
IF 8.9
Min Sun,Zhijun Liang,Rui Zhang,Kai Zhang,Kai kai Ba,Yanhong Lin,Dejun Wang,Tengfeng Xie,Yu Zhang
Recently, constructing heterostructures at the working electrode has emerged as a promising technique in energy storage. This approach utilizes the interfacial energy level difference between two semiconductors to enhance charge transfer and improve Li + diffusion kinetics. In this work, we employed an in-situ hydrothermal method to successfully fabricate TiO 2 /MoO 3 heterostructured electrodes. The resulting interface driving force of approximately 0.54 V exhibited a significant enhancement in charge transfer and demonstrated superior Li + storage performance compared to individual MoO 3 electrodes. Additionally, the incorporation of TiO 2 effectively reduced volume expansion, enhancing the stability of the electrode material. As expected, the heterostructure electrode TiO 2 /MoO 3 (x = 10) exhibits the highest specific capacitance of 606.36 F·g −1 . Our further fabricated asymmetric supercapacitor TiO 2 /MoO 3 (x = 10)//PPy device presents an energy density of 42.28 Wh·kg −1 , which is 1.57-fold higher than that of the MoO 3 //PPy device. This study introduces a methodology that enhances the efficiency and accessibility in the process of creating electrode materials, thereby offering a more streamlined and user-friendly avenue for the advancement of supercapacitor.
研究领域:
材料科学
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电化学
·
能源存储
✓ 已验证
产品关联
DOI
高影响因子
Advanced Science
·
2024
·
IF 14.3
Wenze Wang,Qian Zhang,Liting Yang,Guisheng Liang,Xuhui Xiong,Yifeng Cheng,Limin Wu,Chunfu Lin,Renchao Che
High-entropy materials (HEMs) are extremely popular for electrochemical energy storage nowadays. However, the detailed effects of four core factors of high entropy on the electrochemical properties of HEMs are still unclear. Here, a high-entropy La 1/4 Ce 1/4 Pr 1/4 Nd 1/4 Nb 3 O 9 (HE-LaNb 3 O 9 ) oxide is prepared through multiple rare-metal-ion substitution in LaNb 3 O 9 , and uses HE-LaNb 3 O 9 as a model material to systematically study the effects of the four core factors of high entropy on electrochemical energy-storage materials. The high-entropy effect lowers the calcination temperature for obtaining pure HE-LaNb 3 O 9 . The lattice distortion in HE-LaNb 3 O 9 leads to its decreased unit-cell-volume variations, which benefits its cyclability. Based on the restrained diffusion arising from the lattice distortion, the Li + diffusivity of HE-LaNb 3 O 9 at room temperature (25 °C) is limited, which causes its lowered rate capability. However, the Li + diffusivity of HE-LaNb 3 O 9 at high temperature (60 °C) becomes faster than that of LaNb 3 O 9 , which is attributed to the alleviated lattice distortion at the high-temperature, resulting in higher rate capability. The cocktail effects in HE-LaNb 3 O 9 enable its larger electronic conductivity, better electrochemical activity, more intensive Nb 5+ ↔ Nb 3+ redox reaction, and larger reversible capacity. The insight gained here can provide a guide for the rational design of new HEMs with good energy-storage properties.
研究领域:
材料科学
·
电化学
·
能源存储
✓ 已验证
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2022
·
IF 7.392
Jiamei Lai,Chunhai Jiang,Zhimin Zou
Nanosized oxygen-deficient orthorhombic niobium pentoxide (Nb 2 O 5-x ) that possess high electronic conductivity and stable cycle performance for Li storage are uniformly deposited on the surface of mesophase carbon microspheres (MCMB), which as a whole exhibits very encouraging electrochemical Li ion storage performance, including a high specific capacity of 107 mAh g −1 at 10C (1C = 372 mA g −1 ) and a high capacity retention of 85.4 % after 300 cycles at 3C in the optimized case. The Li + diffusion coefficient of the composite anode as determined by the potentiostatic intermittent titration technique (PITT) is obviously improved as compared to that of pristine MCMB. Ex situ X-ray diffraction characterizations confirm the phase transformation from orthorhombic Nb 2 O 5-x to amorphous Li y Nb 2 O 5-x accompanied by the formation of NbO through a conversion reaction in the first lithiation process. The ultrafast Li + diffusion within the amorphous Li y Nb 2 O 5-x as well as the current-sharing effect of the secondary particles can explain the much enhanced Li ion storage property. The results of this work convincingly demonstrate that designing MCMB/Nb 2 O 5-x composite can be a more practical way to improve the energy and powder densities of Li-ion batteries rather than seeking alternative anode materials with higher capacities.
研究领域:
材料科学
·
电化学
·
能源存储
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
·
2022
·
IF 4.598
Chenhao Cao,Tianci Yan,Jingtian Tong,Junfei Duan,Piao Liu,Chenqian Bie,Guang Zeng,Zhaoyong Chen
Tin-based anode materials have emerged as a promising candidate for lithium-ion batteries due to its inexpensive cost and high theoretical specific capacity, whereas its potential application is limited by severe capacity attenuation and inferior cycling stability due to the huge volume fluctuation during lithiation/delithiation. Herein, SnO 2 /Cu@Carbon composite was fabricated to overcome this problem through a facile co-precipitation approach followed by carbon coating. In the as-prepared composite, SnO 2 and Cu particles are uniformly embedded in N -doped carbon network matrix. Such unique sandwich-like product can greatly alleviate the large volume expansion and SnO 2 aggregation that is conducive to the electron/ion migration, and significantly improve cycling permanence. Therefore, the optimized sample shows impressive long-term stability even at high current density of 1.0 A g −1 (348 mAh g −1 after 1000 loops without obvious capacity decay). Moreover, a comprehensive dynamic analysis of the lithium storage was performed, implying that the increased Li + diffusion coefficient and pseudocapacitive contribution after cycling may account for the improved electrochemical performances.
研究领域:
材料科学
·
能源存储
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
International Journal of Minerals Metallurgy and Materials
·
2022
·Vol. 29
·期 5
·1061-1072
·
IF 3.85
Zhong Jianjian,Qin Lu,Li Jianling,Yang Zhe,Yang Kai,Zhang Mingjie
Two-dimensional Ti 3 C 2 T x exhibits outstanding rate property and cycle performance in lithium-ion capacitors (LICs) due to its unique layered structure, excellent electronic conductivity, and high specific surface area. However, like graphene, Ti 3 C 2 T x restacks during electrochemical cycling due to hydrogen bonding or van der Waals forces, leading to a decrease in the specific surface area and an increase in the diffusion distance of electrolyte ions between the interlayer of the material. Here, a transition metal selenide MoSe 2 with a special three-stacked atomic layered structure, derived from metal—organic framework (MOF), is introduced into the Ti 3 C 2 T x structure through a solvo-thermal method. The synergic effects of rapid Li + diffusion and pillaring effect from the MoSe 2 and excellent conductivity from the Ti 3 C 2 T x sheets endow the material with excellent electrochemical reaction kinetics and capacity. The composite Ti 3 C 2 T x @MoSe 2 material exhibits a high capacity over 300 mAh·g −1 at 150 mA·g −1 and excellent rate property with a specific capacity of 150 mAh·g −1 at 1500 mA·g −1 . Additionally, the material shows a superior capacitive contribution of 86.0% at 2.0 mV·s −1 due to the fast electrochemical reactions. A Ti 3 C 2 T x @MoSe 2 //AC LIC device is also fabricated and exhibits stable cycle performance.
研究领域:
材料科学
·
电化学
·
能源存储
✓ 已验证
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2022
·
IF 9.965
Hankun Tan,Li Sun,Feng Xie,Jingjing Hu,Yaru Qu,Yihe Zhang
An alkali-treated MXene-SnS hybrid was prepared through hydrothermal methods. The Alk-MXene microplates provide highway for electronic transport, and the 3D wrinkled morphology ensures sufficient channels for Li + diffusion. The alkali treatment of MXene gives Alk-MXene@SnS enhanced binding strength, which allows the SnS nanosheets to remain firm binding with the Alk-MXene substrate during cycling and overcome capacity decay caused by large volume change. The synergy between the two components guarantees the hybrid excellent electrochemical properties by enabling high electronic/ionic conductivity and superior kinetic properties as evidenced by EIS, GITT tests and DFT calculation. As a result, the Alk-MXene@SnS retains specific capacities of 519 mAh/g after 100 cycles at 200 mA g −1 , and 330 mAh/g at the high rate of 8000 mA g −1 . In addition, a reversible capacity of 421 mAh/g can be provided after long term cycle test at 1000 mA g −1 for 800 cycles.
研究领域:
材料科学
·
电化学
·
能源存储
✓ 已验证
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2024
·
IF 8.3
Zhenbang Li,Dongpeng Yu,Junjie Xie,Fei Tian,Danni Lei,Chengxin Wang
At present, graphite is a widely used anode material in commercial lithium-ion batteries for its low cost, but the large volume expansion (about 10%) after fully lithiated makes the material prone to cracking and even surface stripping in the cycle. Therefore, the development of zero-strain anode materials (volume change <1%) is of great significance. LiAl5O8 is a zero-strain insertion anode material with a high theoretical specific capacity. However, the Li+ storage mechanism remains unclear, and the cycle life as well as fast-charging capability need to be greatly improved to meet the practical requirements. In this study, LiAl5O8 nanorods are prepared by utilizing aluminum ethoxide nanowires as a soft template and doped with the Zr element to further improve the Li+ diffusion coefficient and electronic conductivity, which in turn improves cycle and rate performances. The Zr-doped LiAl5O8 presents a high reversible capacity of 227.2 mAh g–1 after 20,000 cycles under 5 A g–1, which significantly outperforms the state-of-the-art anode materials. In addition, the Li+ storage mechanisms of LiAl5O8 and Zr-doped LiAl5O8 are clearly clarified with a variety of characterization techniques including nuclear magnetic resonance. This work greatly promotes the practical process of zero-strain insertion anode materials.
研究领域:
材料科学
·
电化学
·
能源存储
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Science Bulletin
·
2024
·
IF 18.8
Zhihong Bi,Anping Zhang,Gongrui Wang,Cong Dong,Pratteek Das,Xiaoyu Shi,Zhong-Shuai Wu
High-voltage and fast-charging LiCoO 2 (LCO) is key to high-energy/power-density Li-ion batteries. However, unstable surface structure and unfavorable electronic/ionic conductivity severely hinder its high-voltage fast-charging cyclability. Here, we construct a Li/Na-B-Mg-Si-O-F-rich mixed ion/electron interface network on the 4.65 V LCO electrode to enhance its rate capability and long-term cycling stability. Specifically, the resulting artificial hybrid conductive network enhances the reversible conversion of Co 3+/4+ /O 2−/ n − redox by the interfacial ion–electron cooperation and suppresses interface side reactions, inducing an ultrathin yet compact cathode electrolyte interphase. Simultaneously, the derived near-surface Na + /Mg 2+ /Si 4+ -pillared local intercalation structure greatly promotes the Li + diffusion around the 4.55 V phase transition and stabilizes the cathode interface. Finally, excellent 3 C (1 C = 274 mA g −1 ) fast charging performance is demonstrated with 73.8% capacity retention over 1000 cycles. Our findings shed new insights to the fundamental mechanism of interfacial ion/electron synergy in stabilizing and enhancing fast-charging cathode materials.
研究领域:
材料科学
·
电化学
·
能源存储
✓ 已验证
DOI
高影响因子
Journal of Materials Chemistry A
·
2024
·Vol. 12
·期 29
·18393-18403
·
IF 10.7
Fengjie Zhang,Wenhao Fang,Xiangkun Wu,Xingmei Lu
Currently, addressing the challenges posed by the low energy density of lithium titanate (LTO), a prevalent anode material in lithium slurry batteries (LSBs), is crucial for ensuring high stability, storage capacity, and cycle stability, thereby facilitating the commercialization of LSBs. In this study, a heterostructure (LTO-TOB) was created by integrating nano-TiO2(B) (bronze phase) onto the surface of commercial LTO. The coated TiO2(B) layer significantly increases the specific surface area and wettability, guaranteeing fantastic stability. The pseudo-capacitance lithium storage ability of TiO2(B) boosts the power of the electrochemical reaction. The extra interface in the crystalline phase and the presence of oxygen vacancies serve not just as lithium storage sites, but also accelerate the Li+ diffusivity and enhance the electron conductivity. Furthermore, the diffusion mechanism of lithium ions within LTO-TOB anolyte was examined by using a designed in situ Raman cell. The engineered LTO-TOB anolyte assembled reactor boasts a substantial specific capacity of 209.12 mA h g−1 at 0.5C, coupled with remarkable cycle steadiness (with a mere 0.095% capacity loss per 100 cycles). The reactor exhibits favorable electrochemical characteristics in both intermittent mode and static long-term cyclic mode, thereby highlighting the significance of surface heterostructure modification as a key approach in advancing the progress of LSBs.
研究领域:
材料科学
·
电化学
·
电池技术
✓ 已验证
DOI
高影响因子
Small
·
2022
·Vol. 18
·期 12
·2107365
·
IF 15.153
Changyuan Guo,Ziang Liu,Kang Han,Liuyang Zhang,Xiaoling Ding,Xuanpeng Wang,Liqiang Mai
The further demand for electric vehicles and smart grids prompts that the comprehensive function of lithium-ion batteries (LIBs) has been improved greatly. However, due to sluggish Li + diffusion rate, thermal runway and volume expansion, the commercial graphite as an important part of LIBs is not suitable for fast-charging. Herein, nano-sized Nb 14 W 3 O 44 blocks are effectively synthesized as a fast-charge anode material. The nano-sized structure provides shorter Li + diffusion pathway in the solid phase than micro-sized materials by several orders of magnitude, corresponding to accelerating the Li + diffusion rate, which is beneficial for fast-charge characteristics. Consequently, Nb 14 W 3 O 44 displays excellent long-term cycling life (135 mAh g -1 over 1000 cycles at 10 C) and rate capability at ultra-high current density ( ≈ 103.9 mAh g -1 , 100 C) in half-cells. In situ X-ray diffraction and Raman combined with scanning electron microscopy clearly confirms the stability of crystal and microstructure. Furthermore, the fabricated Nb 14 W 3 O 44 ||LiFePO 4 full cells exhibit a remarkable power density and demonstrate a reversible specific capacity. The pouch cell delivers long cycling life (the capacity retention is as high as 96.6% at 10 C after 5000 cycles) and high-safety performance. Therefore, nano-sized Nb 14 W 3 O 44 could be recognized as a promising fast-charge anode toward next-generation practical LIBs.
研究领域:
材料科学
·
电化学
·
能量存储
·
纳米技术
✓ 已验证
DOI
高影响因子
Journal of Materials Chemistry A
·
2024
·
IF 10.7
Yuan He,Xulong Jing,Tianxing Lai,Dong Jiang,Chao Wan,Pavel S Postnikov,Olga Guselnikova,Lixin Xu,Xiaojun He,Yusuke Yamauchi,Biyu Jin
The application of polyvinylidene fluoride (PVDF) binder in lithium-sulfur batteries faces challenges due to inadequate adhesion, undesirable conductivities, limited lithium polysulfides absorbability, and its dependence on the use of toxic N-methyl-2-pyrrolidone solvent. Here, a polysaccharide emulsion binder (HBEA) is synthesized by polymerizing and grafting hydrophilic lithiated acrylic acid, 2-hydroxyethyl acrylate, and hydrophobic butyl acrylate onto the backbone of sodium hyaluronate. The amphipathic nature of the synthesized binder enables outstanding affinity to electrode materials, ensuring exceptional adhesion compared to PVDF in various destructive tests. Additionally, the abundant polar groups in HBEA facilitate effective absorption of lithium polysulfides, leading to enhanced sulfur utilization and improved protection of the lithium anode. Furthermore, the presence of lithiated acrylic acid in HBEA leads to a Li+ diffusion coefficient 0.6~1 times larger than that of PVDF in the HBEA binder-based cells. As a result, the high-loading HBEA cell (5 mg cm-2) demonstrates an initial discharge capacity of 3.3 mAh cm-2 at 0.5C and maintains an 87.8% capacity retention after 75 cycles. This work offers an environmentally friendly and easily producible emulsion binder for high-mass-loading sulfur cathodes.
研究领域:
材料科学
·
电化学
·
电池技术
✓ 已验证
产品关联
DOI
高影响因子
ACS Nano
·
2022
·
IF 18.027
Qi Gong,Lei Hou,Tianyu Li,Yucong Jiao,Peiyi Wu
Polymer binders have been shown to efficiently conquer the notorious lithium polysulfide (LiPS) shuttle effects in lithium–sulfur (Li–S) batteries for years, but more study is needed. Herein, a water dispersible and molecular interaction regulated polymer binder (PNAVS) for Li–S batteries was elaborately designed by co-polymerizing N-acryloyl glycinamide and 3-(1-vinyl-3-imidazolio)propanesulfonate. We demonstrate that by modulating the multiple interactions between the functional groups through copolymerization the binder was able to coordinate the LiPSs with higher binding energy for shuttle effect alleviation and cycling performance improvement. In addition, the Li+ diffusion coefficient is also optimized in the PNAVS binder, which facilitates acceleration of the redox kinetics during cycling. Consequently, the PNAVS binder renders the Li–S battery with an ultrastable open circuit voltage for more than 3000 h. Even with a high sulfur loading of 11.7 mg cm–2, the battery can still exhibit excellent areal capacity of 12.21 mA h cm–2. As proof of concept, a pouch cell was also demonstrated with the stable cycling performance for 110 cycles. The binder engineering strategy in this work will propel the practical applications of high-performance batteries.
研究领域:
材料科学
·
电化学
·
电池技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）