CERAMICS INTERNATIONAL
·
2023
·
IF 5.2
Dong Yang,Junyuan Tian,Shuo Tian,Fang Yu,Kailiang Ren
BNT-6BT-based lead-free ceramics have gained significant attention due to their relatively large piezoelectric coefficients and tunable morphotropic phase boundary conditions. In this investigation, SrTiO 3 (ST) was added to BNT-6BT ceramics to fabricate the BNT-6BT- x ST (BNBT- x ST) composition. The impact of ST content on the phase structure and dielectric permittivity of the BNBT- x ST ceramics was studied. The XRD refinement data show that with increasing ST content, the crystal structure of BNBT- x ST ceramics was transformed from the morphotropic phase structure (coexisting tetragonal (P4/mmm) and pseudo-cubic (Pmm) phase) to the pseudo-cubic phase. The dielectric permittivity data of the BNBT-80ST showed that the T m (the maximum permittivity temperature) moved to −61.9 °C, which caused the room temperature to fall within the range of T m < T < T B (the Burns temperature). This makes the BNBT-80ST a superparaelectric state in relaxor ferroelectrics (RFE). Furthermore, the maximum energy density and the charge-discharge efficiency of the BNBT-80ST achieved 5.48 J/cm 3 and 87% at 495 kV/cm, respectively. The energy density of the BNBT-80ST was improved by 2.97-fold and 49% compared with that of the BNBT-30ST and BNBT-70ST. This is mostly attributed to weakened ferroelectricity and improved paraelectricity in the BNBT-80ST. This investigation demonstrates that BNBT- x ST ceramics can be adjusted to a superparaelectric state with an ST content of 80%. This makes the material to possess both a large polarization and a high breakdown field. This material holds great promise for high energy density capacitor applications.
研究领域:
材料科学
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陶瓷
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铁电材料
·
能量存储
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DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2023
·
IF 6.2
Xinrui Qiang,Chao Feng,Bingzhe Jia,Han Wang,Yan Wang,Xinming Wu
The same element heterojunction structure can effectively improve the energy density of the electrodes with its unique structural properties, but the specific mechanism of heterojunction action is not clear. Based on this, in this paper, the same element heterojunction electrode constructed with FeOOH on NiFe-LDHs can reach a specific capacitance of 4.34 F cm -2 at 2 mA cm -2 . After 6000 cycles, its capacity is still maintained to 95.67% (30 mA cm -2 ). The FeOOH@NiFe-LDHs//AC flexible supercapacitor device was prepared to achieve a specific capacitance of 1.06 F cm -2 at 2 mA cm -2 . More notably, an impressive energy density of 0.47 mWh cm -2 at 1.78 mW cm -2 was achieved, which is higher than previous reported. In addition, the capacitance remains 96.3% after 3000 cycles at 50 mA cm -2 , and the electrode exhibited flexibility and outstanding bending stability. The high energy density of the electrodes in this study is attributed to the resulting Fermi energy level differences, which provide more carriers and increase the conductivity of the electrode material. This suggests that the heterojunction has obvious advantages for increasing the energy density of both flexible and non-flexible electrodes, and also provides new ideas for the application of supercapacitors in wearable electronic devices.
研究领域:
材料科学
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能源存储与转换
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DOI
高影响因子
Nature Communications
·
2024
·Vol. 15
·期 1
·1-10
·
IF 14.7
Cui Fangyan,Li Jingzhen,Lai Chen,Li Changzhan,Sun Chunhao,Du Kai,Wang Jinshu,Li Hongyi,Huang Aoming,Peng Shengjie,Hu Yuxiang
Conventionally, rocking-chair batteries capacity primarily depends on cation shuttling. However, intrinsically high-charge-density metal-ions, such as Al 3+ , inevitably cause strong Coulombic ion-lattice interactions, resulting in low practical energy density and inferior long-term stability towards rechargeable aluminium batteries (RABs). Herein, we introduce tunable quantum confinement effects and tailor a family of anion/cation co-(de)intercalation superlattice cathodes, achieving high-voltage anion charge compensation, with extra-capacity, in RABs. The optimized superlattice cathode with adjustable van der Waals not only enables facile traditional cation (de)intercalation, but also activates O 2– compensation with an extra anion reaction. Furthermore, the constructed cathode delivers high energy-density (466 Wh kg –1 at 107 W kg −1 ) and one of the best cycle stability (225 mAh g –1 over 3000 cycles at 2.0 A g –1 ) in RABs. Overall, the anion-involving redox mechanism overcomes the bottlenecks of conventional electrodes, thereby heralding a promising advance in energy-storage-systems.
研究领域:
材料科学
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电化学
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储能技术
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产品关联
DOI
PubMed
高影响因子
Energy & Environmental Science
·
2019
·Vol. 12
·期 6
·1918-1927
·
IF 33.25
Xuefeng Zhang,Shuqiang Jiao,Jiguo Tu,Wei-Li Song,Xiang Xiao,Shijie Li,Mingyong Wang,Haiping Lei,Donghua Tian,Haosen Chen,Daining Fang
For exploring promising energy storage devices beyond lithium ion batteries, aluminum ion batteries (AIBs) are desirable cells with high energy-to-price ratios because of abundant natural resources, the higher energy density of aluminum and elimination of unexpected safety risks. Nevertheless, an ideal rechargeable AIB configuration with ultrahigh capacity is still fundamentally pursued. For fundamentally promoting the most promising chalcogen or chalcogenide-based AIB positive electrode materials, here rechargeable tellurium (Te) nanowire positive electrodes are demonstrated to construct novel tellurium–aluminum batteries. The cell configuration allows Te nanowires for delivering an ultrahigh discharge capacity ∼1026 mA h g−1 (with a specific current of 0.5 A g−1) along with an initial 1.4 V discharge voltage, competitive with the record-setting energy density of the documented AIBs. For essentially tackling the dramatic capacity loss in tellurium positive electrodes, the mechanism of impacting the rechargeable ability is linked to the production of soluble tellurium chloroaluminate compounds upon both chemical dissolution and electrochemical conversion processes. As a consequence, the cell configuration is proved to substantially suppress the unexpected shuttle effects induced by soluble tellurium chloroaluminate compounds via employing reduced graphene oxide to support the tellurium positive electrodes as well as utilizing functionalized carbon nanotube membranes to modify the separators. The implication of the results suggests a nice plateau for massively promoting the rechargeable ability of AIBs, advancing remarkable routes for achieving ultrahigh capacity and energy density.
研究领域:
材料科学
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能源技术
✓ 已验证
DOI
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2025
·
IF 19
Tao Wang,Mengyu Zhang,Rui Song,Zhenhao Fan,Ahmad Azmin Mohamad,Kaixin Song,Dawei Wang,Mingfu Zhang
The inherent limitations (particularly low discharged energy density, U d ≈2 J∙cm −3 ) of commercially available biaxially-oriented polypropylene (BOPP) film capacitors significantly restrict their broader application in advanced energy storage systems. This study presents a novel approach to overcome this limitation through the development of all-organic dielectric composite films. A ternary polymer blend matrix, comprising poly(methyl methacrylate) (PMMA), poly(vinylidene fluoride) (PVDF), and poly(vinylidene fluoride-hexafluoropropylene) (P(VDF-HFP)), is employed, with the incorporation of 1,4,5,8-naphthalenetetracarboxylic dianhydride (NTCDA) molecular semiconductors as nanofillers. Systematic investigation reveals that controlled modulation of the PMMA content within the blend matrix effectively suppresss leakage current by reducing crystallinity, minimizing crystallite size, and stabilizing the γ -phase in the ferroelectric polymer matrix. Simultaneously, the introduction of NTCDA nanofillers create a high density of deep electron traps, thereby impeding charge injection and enhancing charge carrier trapping within the composite film. The optimized composite film, incorporating 0.5 vol.% NTCDA and 40 wt.% PMMA within the PVDF/P(VDF-HFP) matrix, demonstrates a substantial enhancement in both breakdown strength ( E b ) of 1054 MV∙m −1 and U d of 28.10 J∙cm −3 , representing a considerable improvement over conventional BOPP-based capacitor. These findings offer a promising strategy for the design and fabrication of high-performance all-organic dielectric composite films for next-generation energy storage applications.
研究领域:
材料科学
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能源存储
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
·
2015
·
IF 2.729
Xue Chen,Xiaoshu Zhu,Yinghong Xiao,Xiaodi Yang
A novel electrode material for supercapacitor composed of poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT) and graphitic-phase C 3 N 4 (g-C 3 N 4 ) was prepared by a layer-by-layer assembly method. The resulting composite of PEDOT/g-C 3 N 4 represented excellent electrochemical stability in neutral electrolyte and enhanced electrochemical performance of capacitance and average energy density in comparison with single PEDOT. The specific capacitance was 137 F g −1 in H 2 SO 4 and 200 F g −1 in Na 2 SO 4 at a current density of 2 A g −1 , respectively. More significantly, the average energy density was 9.65 W h kg −1 at an average power density of 4001.86 W kg −1 in H 2 SO 4 . While in Na 2 SO 4 , the average energy density reached 17.5 W h kg −1 at an average power density of 5000 W kg −1 . More than 89% and 96.5% of capacitance were retained in H 2 SO 4 and Na 2 SO 4 respectively, suggesting that PEDOT/g-C 3 N 4 possessed an excellent cycling stability in view of capacity performance as electrode materials. The property improvement was attributed to the synergistic effects of the two components in the composite.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Energy Storage
·
2023
·
IF 9.4
Qinzheng Hu,Shuzhen Cui,Kanjun Sun,Xiuting Shi,Wenxing Miao,Xiangbing Wang,Hui Peng,Guofu Ma
In recent years, the research focus of flexible supercapacitor is to improve its energy density . The recently reported improved energy storage method is to introducing suitable redox-additive in gel electrolytes to enhance their redox-activity. Herein, a novel stretchable, redox-active and double-network 4-hydroxy-2,2,6,6-tetramethylpiperidine 1-oxy-containing polyacrylamide/alginate/H 2 SO 4 (PAM/SA/H 2 SO 4 /TEMPOL) hydrogel electrolyte is prepared by radical cross-linking polymerization and solvent displacement process. The PAM/SA/H 2 SO 4 /TEMPOL hydrogel possesses superior stretchability (750 %) because of the electrostatic interactions between the -NH 3+ groups of the PAM and the -COO − groups of SA . In addition, the introduction of the TEMPOL additive into PAM/SA/H 2 SO 4 /TEMPOL hydrogel electrolyte of flexible EDLC can gain a high specific capacitance (386 F g −1 ) and high energy density of 24.5 Wh kg −1 , which is due to dual redox reactions both positive/negative electrode. This study provides a new strategy for designing a multifunctional redox hydrogel electrolyte.
研究领域:
材料科学
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电化学
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能源存储
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产品关联
DOI
高影响因子
INDUSTRIAL CROPS AND PRODUCTS
·
2024
·
IF 5.6
Gaigai Duan,Shiyi Zeng,Haotian Jin,Shuijian He,Haoqi Yang,Xiaoshuai Han,Chunmei Zhang,Yong Huang,Shaohua Jiang
Carbon-based supercapacitors are highly regarded for their high specific power and long cycle life. However, they often face the challenge of low specific energy and difficulty in simultaneously improving both specific energy and specific power. In this study, a high-performance composite electrode was prepared using the cross-section of bamboo as raw material, followed by KOH activation, in-situ growth of ZIF-67, and carbonization. The bamboo-derived porous carbon showed significant improvement in performance indicators such as specific capacitance and energy density. Electrochemical characterization in a three-electrode system showed that at a current density of 1 mA cm −2 , our composite electrode material achieved a peak specific capacitance of 24.7 F cm −2 . When assembled into a symmetric supercapacitor, it can provide an energy density of 1.00 mWh cm −2 at a power density of 2.49 mW cm −2 . Notably, at a substantial current density of 30 mA cm −2 , the electrode maintained a capacitance retention of 96.2 % after 10,000 cycles. These results not only highlight the potential of bamboo-derived porous carbon but also point to a broad avenue for the preparation of energy storage devices by combining MOFs with bamboo.
研究领域:
材料科学
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能源存储
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DOI
高影响因子
Journal of Materials Chemistry A
·
2019
·Vol. 7
·期 13
·7516-7525
·
IF 10.733
Guodong Zou,Bingcheng Ge,Hao Zhang,Qingrui Zhang,Carlos Fernandez,Wen Li,Jianyu Huang,Qiuming Peng
Increasing environmental problems and energy challenges have created an urgent demand for the development of green and efficient energy-storage systems. The search for new materials that could improve the performance of Li-ion batteries (LIBs) is one of today's most challenging tasks. Herein, a stable symmetric LIB based on the bipolar material-MXene/Na0.55Mn1.4Ti0.6O4 was developed. This bipolar hybrid material showed a typical MXene-type layered structure with high conductivity, containing two electrochemically active redox couples, namely, Mn4+/Mn3+ (3.06 V) and Mn2+/Mn (0.25 V). This MXene/Na0.55Mn2O4-based symmetric full cell exhibited the highest energy density of 393.4 W h kg−1 among all symmetric full cells reported so far, wherein it is bestowed with a high average voltage of 2.81 V and a reversible capacity of 140 mA h g−1 at a current density of 100 mA g−1. In addition, it offers a capacity retention of 79.4% after 200 cycles at a current density of 500 mA g−1. This symmetric lithium ion full battery will stimulate further research on new LIBs using the same active materials with improved safety, lower costs and a long life-span.
研究领域:
材料科学
·
能源存储技术
✓ 已验证
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2017
·
IF 2.986
Yong Peng,Manwen Yao,Xi Yao
SrTiO 3 -based films doped with different Al-precursors were prepared by sol-gel methods and the dielectric strengths and leakage currents of the materials were investigated. The best performance was found in SrTiO 3 films doped with Al 2 O 3 nanoparticles (nano-Al 2 O 3 ). When 5 mol% of nano-Al 2 O 3 was added to SrTiO 3 films with Al electrodes, the dielectric strength was enhanced to 506.9 MV/m compared with a value of 233.5 MV/m for SrTiO 3 films. The energy density of the 5 mol% nano-Al 2 O 3 doped SrTiO 3 films was 19.3 J/cm 3 , which was also far higher than that of the SrTiO 3 films (3.2 J/cm 3 ). These results were attributed to interfacial anodic oxidation reactions, which were experimentally confirmed by cross-sectional transmission electron microscope studies and theoretically modelled based on Faraday's laws . The films with added nano-Al 2 O 3 featured many conducting paths at the interfaces between the host phase and the guest nano-Al 2 O 3 , which promoted ion transport and contributed to the strong anodic oxidation reaction capability of the 5 mol% nano-Al 2 O 3 doped SrTiO 3 films.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Energy Materials
·
2022
·
IF 6.959
Qinzhao Sun,Bofeng Shi,Tianran Zhang,Weijie Yang,Jiping Wang,Lixue Zhang,Dezhen Xue,Zepeng Wang,Fang Kang,Xiaoxiao Zhang
Dielectric capacitors with a high energy-storage density and efficiency are urgently required for miniaturization and integration of power electronics and pulsed power system. Herein, single-layered stretched P(VDF-HFP) with a certain content of poly(methyl methacrylate) (PMMA) and two kinds of sandwich-structured films are prepared to optimize and compare energy-storage performance. The results revealed that the crystallization transition behavior of stretched P(VDF-HFP) films contributed to enhance its electric polarization, while the introduction of linear type PMMA resulted in an enhancement of voltage tolerance of stretched films by improving the mechanical properties and suppressing leakage current. What’s more, the effects of crystalline orientations and structure design on the breakdown mechanism of stretched films were revealed by finite element theoretical simulation. As a consequence, the stretched sandwich-structured 0-25-0-S (pure P(VDF-HFP) serves as the outer layer, and blends represent the middle layer; the digit representing PMMA content in the P(VDF-HFP)) displayed a high Ue of 28.71 J/cm3 and η of 74% under 680 MV/m. This work provides a workable and effective method for developing capacitive films with great energy-storage performance.
研究领域:
材料科学
·
电子工程
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产品关联
DOI
高影响因子
ADVANCED MATERIALS
·
2020
·Vol. 32
·期 42
·2001212
·
IF 27.398
Li-Li Chen,Wei-Li Song,Na Li,Handong Jiao,Xue Han,Yiwa Luo,Mingyong Wang,Haosen Chen,Shuqiang Jiao,Daining Fang
As one of the emerging safe energy-storage devices with high energy-to-cost ratio, nonaqueous aluminum batteries with enhanced energy density are intensively pursued by researchers. Although significant progress has been made on positive electrode materials, the effective energy density of aluminum batteries is still limited by the presence of high-density refractory metal current collectors, which are known to be electrochemically inert in highly acidic ionic-liquid electrolytes. To address such critical issues, here, a novel low-density (<2 g cm −3 ) nonmetal current collector is presented, which uses poly(ethylene terephthalate) (PET) substrates coated with indium tin oxide (ITO), with the purpose of significantly reducing the ratio of nonactive components in the electrodes. In addition to the excellent chemical and electrochemical stability (with voltage as high as ≈2.75 V vs Al 3+ /Al), this nonmetal current collector, also encompassing a carboxymethyl cellulose (CMC) binder, allows as-assembled pouch cells to deliver a reversible specific capacity of ≈120 mAh g −1 at a current density of 50 mA g −1 . In comparison with the high-density refractory metal Mo or Ta current collectors, these nonmetal current collectors offer a novel strategy for constructing high-energy-density aluminum batteries by substituting the key components, with the aim of boosting the energy density of nonaqueous aluminum batteries.
研究领域:
材料科学
·
电化学
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能源存储
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DOI
高影响因子
危险品化学品经营许可证（带存储）