CHINESE JOURNAL OF CHEMICAL PHYSICS
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2023
·Vol. 36
·期 1
·103-112
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IF 1
Mo Guang-shuai,Ge Kang-kang,Liu Guang-ming
Specific energy and self-discharge are two important performances of electrochemical capacitors. In this work, we have fabricated the composite electrodes by complexing the negatively charged carboxylated multi-walled carbon nanotubes (cMWCNT) with the redox active units-containing positively charged random copolymers. 2,2,6,6-Tetramethylpiperidinyl- N -oxyl and viologen are employed as model redox active units to exemplify the strategy of the concurrent increase of specific energy and suppression of self-discharge of a two-electrode device. The slower hydrogen and oxygen evolution reactions compared with the reactions of the redox active units lead to an increased electrolyte decomposition window, thereby giving rise to an increase in specific energy. On the other hand, the complexation between the cMWCNT and the copolymers suppresses both the redox shuttling and the cross-diffusion of the redox active units-containing polymer chains, leading to an improved performance of self-discharge. Based on the complexation between carbon nanotubes and redox active units-containing charged copolymers, this work provides a convenient and universal strategy to concurrently increase specific energy and suppress self-discharge of electrochemical capacitors.
研究领域:
材料科学
·
电化学
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DOI
高影响因子
Structures
·
2023
·
IF 4.1
Zixuan Fan,Gaoyuan Ye,Shuai Li,Zhongyang Bai,Qiwen Yong,Yuhui Zhang,Yingcheng Hu
In this paper, a fast-growing poplar wood was selected as the structural raw material to construct a green, eco-friendly, and high-quality building structure. The pretreatment and hot-pressing process were designed to reinforce the poplar wood, and the reinforced poplar square honeycomb structure was further manufactured by the inlay-locking process. Quasi-static axial compression tests were conducted on the reinforced poplar and natural wood honeycomb structures. The results reveal the compression damage mode of the square honeycomb structure to be the shear damage of the honeycomb ribs due to the flexion of the core. The reduced height and increased relative density of the honeycomb structure were able to enhance the strength and elastic modulus . The specific energy absorption of the square honeycomb structures was found to be similar or better than that of other lattice structures. The results reveal that an excellent specific strength and energy absorption can be achieved through poplar reinforced designation, showing great potential for biomass material applications in construction.
研究领域:
材料科学
·
生态学
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产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Xin Ren,Fanjue Wen,Shuai Cao,Fei Xu
Rechargeable magnesium batteries (RMBs) attract special interests as a low-cost and reliable energy-storage technology, but the development is hindered by the low capacities and sluggish Mg 2+ diffusion kinetics of the traditional inorganic cathode materials. Organic polymers break the hindrance of inorganic lattice and deliver plenty of candidates for RMB cathodes with the flexible and designable frameworks. Herein, three organic polyanthraquinonyl sulfides (PAQSs) are fabricated and investigated comparatively as RMB cathodes to reveal the effect of structure on the electrochemical magnesium-storage performance. It is demonstrated that the capacity decay is primarily owing to the dissolution of the discharge products (magnesiation state) in the electrolyte. The degree of polymerization is an important factor for the cycling stability. Prominently, poly(2,6-anthraquinonyl sulfide) shows an outstanding comprehensive performance, providing a high capacity (145 mAh g −1 at 50 mA g −1 ), an outstanding rate capability (74 mAh/g at 10C) and an excellent cyclability (99 % capacity retained after 1000 cycles at 5C). Significantly, poly(2,6-anthraquinonyl sulfide) store Mg 2+ rather than MgCl + , and exhibits a considerable specific energy density of 185 Wh kg −1 . The present work would assist the rational design of advanced organic RMB electrode materials, and highlights the advantages of organic polymers based on enolization chemistry for high-performance magnesium-storage.
研究领域:
材料科学
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电化学
✓ 已验证
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2025
·
IF 6.9
Jianwen Xu,Menghan Zhu,Mingdao Zhang,Li Song,Yachao Jin
Lithium/Carbon Fluoride (Li/CF x ) primary batteries are widely regarded as one of the most promising electrochemical energy supply technologies in the military and medical fields due to their high energy density, low self-discharge rate, and good safety performance. However, Li/CF x batteries suffer from poor power density and severe voltage hysteresis, and solutions are often considered in terms of both cathode and electrolyte. In this work, an N,N-dimethylacetamide (DMA)-based electrolyte was designed to enhance the discharge platform of Li/CF x . The results show that DMA has a high dielectric constant and can effectively improve the ionic conductivity of the electrolyte as well as increase the solubility of lithium salts in the electrolyte. The optimized electrolyte was 1 M lithium bis(trifluoromethanesulfonyl)imide (LiTFSI) dissolved in DMA and PC (7:3 vol ratio). At 1C discharge rate, the specific capacity reached 726 mAh/g, the specific energy reached 1634 Wh/kg, and the voltage platform was raised to 2.32 V. The optimized electrolyte also demonstrates better discharge performance in pouch batteries.
研究领域:
材料科学
·
电化学
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产品关联
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2021
·
IF 4.539
Shang Wu,Xuexue Yang,Tao Cui,Qiaoliang Feng,Sheng Zhou,Xin Xu,Huanlei Zhao,Lan Wu,Yuan He,Quanlu Yang
The tubular-like NiS/Mo 2 S 3 microspheres as electrode material are designed and synthesized by solvothermal method , and match with activated carbon to build a new asymmetric supercapacitor , improving specific energy and cycle life of asymmetric supercapacitors. The NiS/Mo 2 S 3 composite material of tubular-like microspheres possesses excellent specific capacity (199 mAh g −1 at a current density of 1 A g –1 ) and long cycle life (76% of initial capacity after 3000 cycles). In addition, a new asymmetric supercapacitor (ASC) based on NiS/Mo 2 S 3 (positive electrode) and AC (negative electrode) is fabricated, which have high energy storage and excellent cycle stability. The NiS/Mo 2 S 3 -2//AC ASC possesses high specific energy (31.2 Wh Kg −1 ) and specific power (850 W Kg −1 ), its specific capacity still maintains 81.3% after 10,000 cycles. Therefore, the tubular-like NiS/Mo 2 S 3 microspheres may enrich the material system related to nickel-molybdenum bimetal for SCs.
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
Nature Communications
·
2025
·Vol. 16
·期 1
·1-13
·
IF 15.7
Huang Jun,Yang Qirui,Hu Anyi,Liao Zhu,Zhang Zhengxi,Zheng Qinfeng,Ren Zhouhong,Zheng Shun,Zhang Yixiao,Yang Xiaolong,Xu Zhenming,Zhang Le,Zhu Daming,Wen Wen,Liu Xi,Orita Akihiro,Saito Nagahiro,Wang Liguang,Xia Yongyao,Chen Liwei,Lu Jun,Yang Li
Developing lithium-ion batteries with high specific energy and fast-charging capability requires overcoming the potential-capacity trade-off in negative electrodes. Conventional fast-charging materials (e.g., Li 4 Ti 5 O 12 , TiNb 2 O 7 ) operate at high potentials (>1.5 V vs. Li + /Li) to circumvent lithium plating, yet this compromises specific energy. A viable strategy for enhancing the specific energy is to reduce the potential while avoiding the lithium plating risk; however, the underlying mechanisms remain unclear. Here we demonstrate that enhancing Titanium-Oxygen covalency through pseudo-Jahn-Teller Effect distortion in Ruddlesden-Popper perovskites enables low-potential operation. The Li 2 La 2 Ti 3 O 10 negative electrode exhibits a working potential of 0.5 V vs. Li + /Li with initial 139.3 mAh g −1 at 5 A g −1 and 72.9% capacity retention after 5000 cycles. Full cells with LiNi 0.8 Co 0.1 Mn 0.1 O 2 positive electrodes deliver 3.45 V average discharge voltage-50% higher than conventional Li 4 Ti 5 O 12 | |LiNi 0.8 Co 0.1 Mn 0.1 O 2 systems-achieving 100 mAh g −1 at 4 A g −1 . Mechanistic analysis reveals low Li⁺ migration barriers and stable Ruddlesden-Popper perovskite frameworks enable rapid ion transport.
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产品关联
DOI
PubMed
高影响因子
Nano Energy
·
2020
·
IF 16.602
Huajin He,Fucheng Ren,Jianping Zhu,Yuxuan Xiang,Bizhu Zheng,Sheng Li,Shijian Chen,Yixiao Li,Qi-Hui Wu,Yong Yang
Li-SF 6 battery has been proposed as a novel energy conversion device for both reducing greenhouse-effect SF 6 and potentially providing large specific energy . However, the real discharge process of SF 6 remains ambiguous with fast cathode passivation and large polarization. Here we report that the Li-SF 6 chemistry is able to deliver an unprecedented capacity of >20,000 mA h g c −1 with reduced polarization and excellent rate capability by using a low-cost, high-surface-area porous carbon as cathode host. More importantly, by adjusting the SF 6 atmosphere, an approximately eight-electron transfer process with predominant products of LiF and Li 2 S is realized via two voltage steps, whereas previously only a little Li 2 S could be found with one plateau appearing. The eight-electron process leads to a high energy density about 2,300 W h kg −1 based on the mass of carbon and discharge products, which sheds light on SF 6 as a promising high-energy-density cathode.
研究领域:
能量转换
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电化学
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材料科学
·
环境科学
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电源技术
✓ 已验证
DOI
高影响因子
Batteries-Basel
·
2023
·Vol. 9
·期 5
·241
·
IF 4
Da Lei,Yuyang Gao,Zhidong Hou,Lingbo Ren,Mingwei Jiang,Yunjing Cao,Yu Zhang,Jian-Gan Wang
Owing to the unique virtues of specific energy/power densities, lithium-ion capacitors (LICs) have been increasingly attracting research attention. However, the LICs are greatly restrained by the slow Li+-reaction kinetics of battery-type anodes, which is still a challenging task. In this work, we construct a superior LIC using ultrafine MnO/dual N-doped carbon (MnO/DNC) anode and activated N-doped porous carbon (ANC) derived from a homologous polypyrrole precursor. The uniform MnO ultrafine particles (~10 nm size) are well encapsulated into a dual-carbon framework, which provides fast ion/electron transportation and structural cushion for high-rate and long-durable energy storage. Accordingly, the anodic MnO/DNC achieves an impressive rate performance (179 mAh g−1@10 A g−1) and a stable 500-cycling lifespan. The as-constructed LICs could deliver a large specific energy of 172 Wh kg−1at 200 W kg−1and retain at 37 Wh kg−1even at a high specific power of 15 kW kg−1. It is believed that the design strategy of confining ultrafine conversion-type anode materials into a dual-carbon structure will expedite the development of advanced LICs.Keywords:lithium-ion capacitor;MnO;dual-carbon structure;reaction kinetics
研究领域:
能源存储
·
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
Nature Communications
·
2025
·Vol. 16
·期 1
·1-14
·
IF 15.7
Zou Zhijuan,Liu Pengfei,Dou Ruiyang,Liu Kaijun,Wang Yunlong,Song Lixian,Tong Liping,Yin Guolu,Kang Wenbin,Cai Wenlong,Zhang Yaping,Chen Hongbing,Song Yingze
Binders are essential for maintaining positive electrode integrity in Li||S batteries and significantly affect their performance. However, commercial linear binders often have disordered networks, poor binding efficiency, and insufficient mechanical strength. To address these challenges, three-dimensional covalent binders offer a promising solution. Traditional methods for producing cross-linked binders require additives and result in poorly controlled polymer networks due to the stochastic nature of liquid-phase polymerization. Moreover, the mechanisms by which reticulated binders stabilize the positive electrode remain unclear, requiring investigation under operando conditions. Herein, we present an approach to tailor cross-linked polyacrylamide networks using solid-state operando γ-ray irradiation chemistry, which eliminates additives and produces a pure, ordered network with remarkable binding capabilities. By integrating in situ high-resolution optical frequency domain reflectometry, multiscale synchrotron radiation characterization, and virtual simulations, this study reveals the role of binders in dynamically encaging and confining sulfur. Specifically, γ-ray-enabled polyacrylamide networks enhance battery performance through mechanical strengthening, optimized sulfur regeneration, and improved re-occupancy. Consequently, the well-designed composite positive electrode structure with only 5.0 wt% binder improves soft-packaged Li||S battery performance across various scenarios. Notably, a 1.2-Ah pouch cell achieves 410.1 Wh kg −1 specific energy with a low electrolyte/sulfur ratio of 3.0 µL mg –1 .
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产品关联
DOI
PubMed
高影响因子
IONICS
·
2020
·Vol. 26
·期 9
·4499-4510
·
IF 2.394
Liu Jian,Xu Ying-Ge,Kong Ling-Bin
Herein, molybdenum trisulfide/nickel disulfide-reduced graphene oxide (Mo 2 S 3 /NiS 2 -RGO) composites as anode material for sodium-ion batteries (SIBs) and sodium-ion capacitors (SICs) were synthesized by one-step facile hydrothermal method. Through electron microscopy analysis, it could be observed that the Mo 2 S 3 /NiS 2 nano-rods and nano-balls were dispersed uniformly over the two-dimensional RGO sheets. When tested as an anode material, Mo 2 S 3 /NiS 2 -RGO showed a considerable reversible capacity of 653.1 mA h g −1 at 100 mA g −1 after 50 cycles and capacity retention of 197.5 mA h g −1 at 5000 mA g −1 after 226 cycles. The sodium storage mechanism of Mo 2 S 3 /NiS 2 -RGO was explained by ex situ XPS. Furthermore, as-fabricated SICs delivered an excellent specific energy of 182.7 W h kg −1 (at 1120 W kg −1 ), and SIBs exhibited the discharge capacities of 85 mA h g −1 at 2 C. Overall, the superior electrochemical performances of Mo 2 S 3 /NiS 2 -RGO demonstrated that it was a promising anode materials to construct high-performance full cell.
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
ACS Applied Materials & Interfaces
·
2025
·
IF 8.2
Kai Zhang,Peifeng Wang,Zhuohui Sun,Hongwei Zhang,Rui Chang,Youlong Xu
Poor electronic conductivity, low potential plateau, rapid capacity decay, and poor rate capability are critical challenges hindering the development of layered transition metal oxides such as P2-Na0.7MnO2. To address these issues, a high-entropy design combined with Cl substitution has been implemented, resulting in the material P2-Na0.7Li0.02K0.02Mg0.02Fe0.05Cu0.05Ni0.25Ti0.02Nb0.02Mn0.59O1.93Cl0.07. Hall effect tests reveal a transition from hole-dominated to electron-dominated conduction, significantly improving the Na+ transport kinetics, enhancing electronic conductivity, and facilitating the release of a high specific capacity and specific energy. Notably, the bulk carrier concentration increases from 1.63 × 1011 to 2.63 × 1012 cm–3, the surface carrier concentration rises from 2.47 × 1010 to 2.16 × 1011 cm–2, and the mobility improves from 322.7 to 455.9 cm2 (V s)−1. Consequently, the electronic conductivity undergoes a remarkable 20-fold increase from 8.44 × 10–6 to 1.915 × 10–4 S cm–1. The material delivers a reversible capacity of 196.80 mAh g–1 and a specific energy of 587.07 Wh kg–1 at a current rate of 0.05 C.
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产品关联
DOI
PubMed
高影响因子
Journal of Energy Storage
·
2024
·
IF 8.9
Haiyang Li,Menglei Wang,Xinyu Lei,Boyou Hu,Hanlu Zhang,Yutong Xing,Meng Zhang
Aqueous zinc-ion batteries (AZIBs) can benefit from a deep understanding of the electrochemical reaction mechanism of cathode materials, which can assist in resolving issues such as cathode dissolution and electrostatic interactions. We reported a straightforward two-step synthesis of polydopamine coated MnO 2 (MnO 2 @PDA) and revealed the energy storage mechanisms in AZIBs. The layered structure of MnO 2 creates a generous passage for the insertion of H + /Zn 2+ ions. Simultaneously, the plethora of functional groups within PDA exerts a robust desolvation effect, bolstering the transfer rate of H + /Zn 2+ . This effect significantly enhances the overall efficiency and performance of cathode. The AZIBs, incorporating MnO 2 @PDA cathode material, consequently exhibit a satisfactory cycling capacity (412 mAh g −1 at 0.1 A g −1 ) and a superb specific energy (561.6 Wh kg −1 at 136.34 W kg −1 ). This work provides a new path for design strategies and catalytic mechanisms of MnO 2 @PDA cathode.
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
危险品化学品经营许可证（带存储）