ADVANCED FUNCTIONAL MATERIALS
·
2023
·Vol. 33
·期 30
·2300589
·
IF 19
Chao Sun,Bing Zhao,Jing Mao,Ke-Hua Dai,Zhen-yu Wang,Lin-bo Tang,He-zhang Chen,Xia-hui Zhang,Jun-chao Zheng
LiCoO 2 plays a key role in energy storage devices due to its high energy density. And the volumetric energy density of LiCoO 2 cathode can be significantly improved by increasing the charging cut-off voltage to 4.6 V. However, the increase in resistance at the LiCoO 2 interface, and the damage to the LiCoO 2 from the outside to the inside by the HF generated that caused by the decomposition of the organic electrolyte and LiPF 6 under 4.6 V conditions are not conducive to structural stability during cycling. Here, it is shown that the decomposition of electrolyte and LiPF 6 is effectively mitigated by inhibiting the interfacial catalytic activity of LiCoO 2 using an atomically thin layer of MXenes as a interlayer. Density functional theory results suggest that the decomposition energy of LiPF 6 is 1.13 and 3.21 eV at the interface of LiCoO 2 and MXenes, respectively. Time of Flight Secondary Ion Mass Spectrometry results further indicate that the decomposition products of the organic electrolyte and LiPF 6 have a thinner thickness at the interface of MXenes (5 nm) than LiCoO 2 (10 nm). This study provides a new and universal strategy for stabilizing the cathode interface to support the development of high energy density lithium-ion batteries.
研究领域:
材料科学
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电化学
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能源存储
✓ 已验证
DOI
高影响因子
Advanced Electronic Materials
·
2022
·Vol. 9
·期 1
·2200414
·
IF 7.633
Wen Huang,Tianxiong Ju,Ruipeng Li,Yajun Duan,Yanan Duan,Junji Wei,Lei Zhu
High energy density, high temperature, and low loss dielectric polymers have drawn increasing attention in research owing to their potential applications in power electronic and pulsed power devices. In this study, a new class of organo-soluble dipolar glass polymers (DGPs) are synthesized via polycondensation and post-functionalization of poly(aryl ether)s (PAEs) based on phenolphthalin. Due to the nonplanar backbone structure, the strongly dipolar side groups (-SO 2 CH 3 and -CH 2 CH 2 CN) can easily rotate in these PAEs. As a result, desirable physical properties are obtained: high dielectric constant (4.4–5.6), high glass transition temperature (155–180 °C), good mechanical property, and low dielectric loss (dissipation factor < 0.005). Among them, cyanolized poly(aryl ether nitrile) exhibit the highest discharged energy density of 8.6 J cm −3 at 650 MV m −1 and room temperature with a high discharged efficiency of 94.3%. At 100 °C, cyanolized poly(ether ether ketone) shows the highest discharged energy density of 7.3 J cm −3 at 600 MV m −1 with a discharged efficiency of 91%. Furthermore, these functionalized PAEs exhibit good mechanical toughness with a tensile strength at a break of 60-120 MPa and elongation at a break of ≈5%. Based on their thermal, mechanical, and dielectric properties, these phenolphthalin-based PAEs are promising for potential applications such as film capacitors.
研究领域:
材料科学
·
电子工程
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2018
·
IF 8.097
Xiangzhen Zhu,Qingfeng Fu,Lingfei Tang,Chunfu Lin,Jian Xu,Guisheng Liang,Renjie Li,Lijie Luo,Yongjun Chen
M–Nb–O compounds are advanced anode materials for lithium-ion batteries (LIBs) due to their high specific capacities, safe operating potentials, and high cycling stability. Nevertheless, the found M–Nb–O anode materials are very limited. Here, Mg2Nb34O87 is developed as a new M–Nb–O material. Mg2Nb34O87 porous microspheres (Mg2Nb34O87-P) with primary-particle sizes of 30–100 nm are fabricated based on a solvothermal method. Mg2Nb34O87 has an open 3 × 4 × ∞ Wadsley–Roth shear structure and a large unit-cell volume, leading to its largest Li+ diffusion coefficients among all the developed M–Nb–O anode materials. In situ X-ray diffraction analyses reveal its high structural stability and intercalating characteristic. These architectural, conductivity, and structural advantages in Mg2Nb34O87-P lead to its most significant intercalation pseudocapacitive contribution (87.7% at 1.1 mV s–1) among the existing M–Nb–O anode materials and prominent rate capability (high reversible capacities of 338 mAh g–1 at 0.1C and 230 mAh g–1 at 10C). Additionally, this new material exhibits a safe operating potential (∼1.68 V), an ultrahigh initial Coulombic efficiency (94.8%), and an outstanding cycling stability (only 6.9% capacity loss at 10C over 500 cycles). All of these evidences indicate that Mg2Nb34O87-P is an ideal anode material for high-energy, safe, fast-charging, and stable LIBs.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
PubMed
高影响因子
FUEL
·
2022
·
IF 8.035
Yi Liu,Ying Chen,Shuang Ma,Xianlong Liu,Xiangwen Zhang,Ji-Jun Zou,Lun Pan
High-energy–density (HED) fuels have attracted extensive attention for volume-fixed aerospace vehicles because they can provide more propulsion energy to increase the payload and range of aerospace vehicles. Herein, we report a route for synthesis of HED fuel, pentacyclo[8.2.1.1 4,7 .0 2,9 .0 3,8 ]tetradecane (PCTD) with strained structure, by photoinduced intermolecular [2 + 2] cycloaddition of norbornene (NBE). The triplet quenching and phosphorescence quenching results indicate that NBE cycloaddition is conducted through the photosensitized processes containing triplet–triplet energy transfer, cyclization and relaxation. The reaction conditions are optimized to obtain the high photocatalytic activity, with the NBE conversion and PCTD selectivity reaching 78.7% and 94.4%, respectively. Moreover, a kinetic model is proposed with the reaction rate equation being correlated with the incident light flux, with the pseudo reaction kinetics parameters and reaction rate equations obtained. Importantly, PCTD shows high density of 1.024 g/mL and high volumetric net heat of combustion of 42.98 MJ/L, much higher than those of JP-10. In addition, blending with JP-10 or QC can significantly improve cryogenic properties of blended fuels, which is very promising for the practical application.
研究领域:
化学工程
·
能源科学
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2021
·
IF 4.527
Dong Feng,Qi Liu,Tianding Hu,Yuan Chen,Tianbiao Zeng
Although the high energy density of Ni-rich LiNi 0.8 Co 0.15 Al 0.05 O 2 (NCA) cathode holds great promise in Li-ion batteries, the moisture sensitivity and undesired dissolution of Ni 2+ in electrolytes that causes rapid capacity fading restrict their further commercial applications. Surface coating is an efficient method to address the problems above. Herein, surface modification of the NCA cathode by using a cheap and highly conductive polyacrylonitrile-induced carbon coating is investigated, and molecular dynamics simulation results suggest that the carbon layer should be as thin as possible. In this way, NCA coated with a highly conductive carbon layer of 5 nm in thickness with enhanced cyclability and integral electrochemical performance is made. The coated carbon film also served as a protective layer by shielding the host NCA cathode materials from direct contact with the electrolyte, thus resulting in enhanced electron transfer . During the charge-discharge repeated cycles 100 times, the carbon-coated NCA cathode exhibits an improved capacity retention (98.4%) at a rate of 1 C over pristine NCA (93.1%). The uniform surface coating strategy might serve as an industrial scalable approach to coat a continuous carbon layer on other electrode materials at a relatively low cost.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
Advanced Energy Materials
·
2024
·
IF 24.4
Dandan Li,Ying-Jie Zhu,Long Cheng,Sida Xie,Han-Ping Yu,Wei Zhang,Zhenming Xu,Ming-Guo Ma,Heng Li
Achieving both high iodine loading cathode and high Zn anode depth of discharge (DOD) is pivotal to unlocking the full potential of energy-dense Zn-I 2 batteries. However, this combination exacerbates the detrimental shuttle effect of polyiodide intermediates, significantly impairing the battery's reversibility and stability. Herein, this study reports an advanced high-loading iodine cathode (denoted as MX-AB@I) enabled by a multifunctional Ti 3 C 2 T x MXene modulator, which presents high stability and energy density in Zn-I 2 batteries. Through comprehensive experimental and theoretical analyses, the intrinsic regulating mechanisms are elucidated by which the MXene modulator effectively suppresses polyiodide shuttling, enhances iodine conversion kinetics, and dramatically improves Zn anode reversibility. With the aid of the MXene modulator, the MX-AB@I composite cathode achieves a high iodine mass loading of 23 mg cm −2 and realizes a practically high areal capacity of 4.0 mAh cm −2 . When paired with a thin Zn anode (10 µm), this configuration realizes a high Zn DOD of 78.7% and a high energy density of 171.3 Wh kg −1 , surpassing the majority of Zn-I 2 battery systems reported in the literature. This study presents an effective approach to designing high-loading iodine cathodes for Zn-I 2 batteries by leveraging MXene modulators to regulate critical electrochemical reaction processes.
研究领域:
材料科学
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电化学
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能源存储
✓ 已验证
产品关联
DOI
高影响因子
Chemistry-An Asian Journal
·
2018
·Vol. 13
·期 15
·1932-1940
·
IF 3.692
Nianming Jiao,Yanqiang Zhang,Hao Li,Long Liu,Suojiang Zhang
Graphical Yes, it is rocket science ! Both the cations and the anions of hypergolic ionic liquids, [bis(imidazolyl)–BH 2 ] + [bis(triazolyl)–BH 2 ] − (see figure), were functionalized with B−H groups and azoles, which play the roles of ‘hypergolic triggers’ and ‘regulators’, respectively. These ionic liquids show great promise as sustainable rocket fuels. [Bis(imidazolyl)–BH 2 ] + [bis(triazolyl)–BH 2 ] − and [bis(imidazolyl)–BH 2 ] + [tris(triazolyl)–BH] − were synthesized, the cations and anions of which were functionalized with B−H groups and azoles. As B−H groups contribute to the hypergolic activity and azole groups improve the energy output, the resulting ionic liquids exhibited ignition delay times as low as 20 ms and energy outputs as high as 461.1 kJ mol −1 . In addition, densities (1.07–1.22 g cm −3 ) and density-specific impulse (≈360 s g cm −3 ) values reached a relatively high level. These ionic liquids show great promise as sustainable rocket fuels.
研究领域:
化学
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材料科学
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航天工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Energy Storage Materials
·
2022
·
IF 20.831
Rui Wang,Huasong Xu,Sang Cheng,Jiajie Liang,Bin Gou,Jiangang Zhou,Jing Fu,Congzhen Xie,Jinliang He,Qi Li
Polymer dielectrics have been widely used for capacitive energy storage. However, the volumetric energy density of polymer dielectrics is generally low, which falls short of the need for high-power and compact-size electronic devices and electrical systems . Here, a scalable all-organic composite based on a ferroelectric polymer incorporated with an abundant, cost-effective organic molecule, i.e. , glucose is reported, exhibiting record dischargeable energy density (37.7 J/cm 3 ) that outperforms the state-of-the-art dielectric polymer composites . The glucose molecules rich in hydroxyl groups are found to facilitate the formation of a physically cross-linking network of hydrogen bonds within the polymer matrix , which is responsible for the remarkable performance improvement. Both simulation and experimental results show that the hydrogen bonds serve as the trapping sites of charge carriers and suppress conduction loss . The hydrogen bond network is also found to account for the increased crystallinity , reduced crystallite size , and stabilized γ phase in the polymer, which leads to enhanced electric displacement and reduced hysteresis loss . In combining the advantages of extraordinary energy storage performance, abundant raw materials, ease of preparation, this approach is viable for large-scale production of polymer-based high-energy-density dielectric materials.
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
·
2021
·
IF 6.024
Jun Ban,Xingxing Jiao,Yangyang Feng,Jing Xue,Cheng He,Jiangxuan Song
Lithium/fluorinated carbon (Li/CFx) batteries have received widespread attention due to their high specific energy density. However, the development of Li/CFx primary batteries is seriously hampered owing to the low electrical conductivity and poor wettability against the fluorinated carbon electrolyte. Here, we report a CFx-compatible fluorinated ether-containing electrolyte for all-temperature high-energy-density Li/CFx primary batteries. Specifically, a CFx-philic 1,1,2,2-tetrafluoroethyl-2,2,3,3-tetrafluoropropyl ether (TTE) is introduced to the carbonate-based electrolyte as a cosolvent. Benefiting from the low viscosity and low freezing point of TTE, the conductivity and wettability are drastically improved, contributing to a lowered charge-transfer resistance. Thus, the modified electrolyte with TTE endows Li/CFx batteries with high energy density of 850 Wh kg–1 at 25 °C and 745 Wh kg–1 at 55 °C under the current density of 5000 mA g–1, accompanied by high power density of 9931 and 10046 W kg–1, respectively. Even at the freezing temperature of −50 °C, Li/CFx batteries can still exhibit a high middle value of voltage of 1.91 V, and the discharge capacity is 299 mAh g–1 at 100 mA g–1. The improvement of electrochemical performance over a wide temperature range from −50 to 55 °C has greatly expanded the application of Li/CFx batteries.
研究领域:
材料科学
·
电化学
·
能源存储
✓ 已验证
DOI
高影响因子
Small Science
·
2021
·Vol. 1
·期 9
·2100021
·
IF 0
Xiangyu Meng,Yufeng Sun,Mengzhou Yu,Zhiyu Wang,Jieshan Qiu
Li metal batteries offer the ultimate choice of high-energy power source, but suffer the performance decay and safety risk originated from notorious dendrite problem and infinite volume change of Li metal anode. Herein, it is reported to strengthen the Li metal anode by ultralight but highly robust MXene aerogels (ULRMA) with build-in strain-resistant and molecular-level lithiophilic properties. A hydrogen-bonding crosslinking strategy is developed for rapidly assembling 2D MXene to ULRMA at ambient conditions with less sacrifice of intrinsic properties of MXene. The ULRMA with an ultralow density below 10 mg cm −3 are favorable to maximize the merit of Li metal in gravimetric energy density while offering exceptional stability of porous frameworks against mechanical strain of long-term Li plating/stripping. The lithiophilic architecture with high conductivity and hierarchical porosity further largely reduces the potential polarization and guides the pattern of Li deposition. Uptaking Li metal into ULRMA leads to a stable Li metal anode with an ultralong lifetime of 1600 h with a high-rate response up to 20 mA cm −2 and high coulombic efficiency. It yields a highly robust Li metal anode with high effectiveness in engineering stable Li-ion and Li–S batteries even paring with commercial LiFePO 4 or sulfur cathode without nanostructuring.
研究领域:
材料科学
·
能源存储
·
电化学
✓ 已验证
DOI
ACS Applied Energy Materials
·
2021
·
IF 6.024
Huiling Chen,Pan He,Meng Li,Yuehua Wen,Gaoping Cao,Jingyi Qiu,Hai Ming,Pengcheng Zhao,Songtong Zhang
In this paper, sulfonated graphene (SA-GE) with the functions of both high electronic conductivity and fast Li+ transport is utilized to modify high-voltage LiNi0.5Mn1.5O4. We show that LiNi0.5Mn1.5O4 modified with 2 wt % SA-GE exhibits extremely long cycling life, achieving a great capacity retention of 98.0% after 1000 cycles at the loading of 2.6 mg cm–2 and 99.0% after 350 cycles at the loading of 6.0 mg cm–2 under 1C. Besides, the rate capability is also greatly improved (discharge capacity remains 78.5 mAh g–1 at 10C). It is revealed that the SA-GE-involved layer could significantly inhibit the rapid growth of the cathode electrolyte interphase (CEI) layer at 5.0 V, which mainly contributes to an enhanced Li+ diffusion kinetics without sacrificing the electronic conductivity of graphene coating. Thus, the polarization degree and charge transfer resistance are significantly mitigated. Furthermore, structure degradation of the cathode is avoided by reducing the side reactions and the dissolution of transition-metal ions. It is thus well demonstrated that chemical decorations of graphene modifiers with an optimized amount of functionized sulfonic acid groups can be a promising strategy to construct lithium-ion batteries with long life and high energy density.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
Small
·
2023
·Vol. 19
·期 36
·2300286
·
IF 13.3
Jianpeng Liu,Chang Cheng,Tianle Wang,Juncheng Zhu,Zhong Li,Guang Ao,Wenliang Zhu,Giuseppe Pezzotti,Jiliang Zhu
Lithium–sulfur (Li–S) battery has been considered as a strong contender for commercial aerospace battery, but the commercialization requires Ah-level pouch cells with both efficient discharge at high rates and ultra-high energy density. In this paper, the application of lithium–sulfur batteries for powering drones by using the cathode of highly dispersed sulfur nanoparticles with well-controlled particle sizes have been realized. The sulfur nanoparticles are prepared by a precipitation method in an eco-friendly and efficient way, and loaded on graphene oxide-cetyltrimethylammonium bromide by molecular grafting to realize a large-scale fabrication of sulfur-based cathodes with superior electrochemical performance. A button cell based on the cathode exhibits an excellent discharge capacity of 62.8 mAh cm −2 at a high sulfur loading of 60 mg cm −2 (i.e., 1046.7 mAh g −1 ). The assembled miniature pouch cell (PCmini) shows a discharge capacity of 130 mAh g −1 , while the formed Ah-level pouch cell (PCAh) achieves energy density of 307 Wh kg −1 at 0.3C and 92 Wh kg −1 at 4C. Especially, a four-axis propeller drone powered by the PC has successfully completed a long flight (>3 min) at high altitudes, demonstrating the practical applicability as aviation batteries.
研究领域:
材料科学
·
能源工程
·
航空航天工程
✓ 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）