Small
·
2024
·Vol. 20
·期 35
·2310037
·
IF 13
Yudan Qian,Zhiming Zhou,Qingcheng Zhang,Huaping Zhao,Heng Chen,Jintong Han,Haiting Wan,Huile Jin,Shun Wang,Yong Lei
Highly concentrated “‘water-in-salt”’ (WIS) electrolytes are promising for high-performance energy storage devices due to their wide electrochemical stability window. However, the energy storage mechanism of MnO 2 in WIS electrolytes-based supercapacitors remains unclear. Herein, MnO 2 nanoflowers are successfully grown on mesoporous bowl-like carbon (MBC) particles to generate MnO 2 /MBC composites, which not only increase electroactive sites and inhibit the pulverization of MnO 2 particles during the fast charging/discharging processes, but also facilitate the electron transfer and ion diffusion within the whole electrode, resulting in significant enhancement of the electrochemical performance. An asymmetric supercapacitor, assembled with MnO 2 /MBC and activated carbon (AC) and using 21 m LiTFSI solution as the WIS electrolyte, delivers an ultrahigh energy density of 70.2 Wh kg −1 at 700 W kg −1 , and still retains 24.8 Wh kg −1 when the power density is increased to 28 kW kg −1 . The ex situ XRD, Raman, and XPS measurements reveal that a reversible reaction of MnO 2 + xLi + + xe − ↔ Li x MnO 2 takes place during charging and discharging. Therefore, the asymmetric MnO 2 /MBC//AC supercapacitor with LiTFSI electrolyte is actually a lithium-ion hybrid supercapacitor, which can greatly boost the energy density of the assembled device and expand the voltage window.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
MATERIALS CHEMISTRY AND PHYSICS
·
2024
·
IF 4.3
Xueqing Shi,Lvye Yang,Jianfeng Yao
A new simple preparation method for water-in-salt-type cellulose hydrogels filled with ZnBr 2 is reported. The ZnBr 2 hydrogel electrolyte can be applied to zinc-ion hybrid supercapacitors and Zn–Br interfacial batteries. The water-in-salt ZnBr 2 hydrogel serves as a stable electrolyte for good electrochemical performance in zinc-ion hybrid supercapacitors without redox reactions and can participate in the charging/discharging process of the Zn–Br interfacial battery through the redox reaction of halogen anions. The assembled zinc-ion hybrid supercapacitor exhibits a specific capacitance of 241.8 F g −1 at 0.5 A g −1 . Furthermore, after a 10,000-cycle-long charging/discharging test at 5 A g −1 , the coulombic efficiency is found at nearly 100 %. The interfacial battery reaches the highest energy efficiency of 66 % at a current density of 3 mA cm −2 at 0–1.8 V and displays a good cycle life with an 88 % average coulombic efficiency at 3 mA cm −2 . This work expands the application of hydrogels and provides new possibilities for optimizing the high performance of electrolytes.
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
CARBON
·
2025
·
IF 11.6
Yingying Lan,Fan Zhang,Lejuan Cai,Yu Zhao,Xingchao Zhang,Lisha Lu,Hao Ling,Meiyun Li,Zhongzhi Yuan,Wenlong Wang
Fluorinated graphite (CF x ) is one of the most important cathode materials used in lithium primary (non-rechargeable) batteries due to its high theoretical energy density . While prior studies have predominantly focused on organic electrolyte systems, the exploration of high-capacity CF x cathode material in aqueous environments presents a compelling opportunity for greener energy storage solutions . Here, we report for the first time a high-performance hybrid aqueous CF x primary battery that employs metallic magnesium (Mg) as the anode in conjunction with a mixed cation acetate-based water-in-salt electrolyte. Our findings indicate that the optimized electrolyte effectively influences the fluorination products, thereby significantly enhancing the performance of the hybrid aqueous Mg/CF x primary battery . Specifically, this battery achieves a remarkable discharge specific capacity of 883 mAh g −1 at a 0.1C rate, maintaining a voltage platform of approximately 1.1 V and exhibiting over 89.7 % capacity retention at a 1C rate. Additionally, the pouch-type Mg/CF x battery demonstrates a commendable specific capacity of 780 mAh g −1 and a notable energy density of 814 Wh kg −1 at a 0.05C rate. This work provides a viable strategy to advance the practical application of high-capacity CF x primary batteries in aqueous electrolytes .
✓ 已验证
产品关联
DOI
高影响因子
SOLAR ENERGY MATERIALS AND SOLAR CELLS
·
2025
·
IF 6.3
Lu Chen,Xianglin Guo,Mingquan Wang,Wei Jiang,Sixiang Cai,Xueqing Tang,Zhen Wang
Electrochromic devices based on non-metallic iodine (I 2 ) electrodeposition feature a simple structure, low cost, and high optical contrast but suffer from poor cycling stability due to the low conductivity of solid I 2 and the formation of dead iodine. Herein, 1-methyl-3-propylimidazolium ions (MPI + ) are introduced into an I − -containing water-in-salt electrolyte, enabling the concurrent generation of solid I 2 and liquid MPII 3 under anodic oxidation. The liquid MPII 3 enhances the I 2 adhesion and interfacial contact, providing a self-healing effect that suppresses dead iodine while improving charge transport and reaction kinetics. As a result, the electrochromic device exhibits outstanding overall performance, including a high optical modulation of 69.2 %, fast switching speeds with coloring/bleaching times of 6.9/11.9 s, and excellent cycling durability with optical contrast retention exceeding 100 % after 20,000 cycles. Furthermore, a large-area dual-deposition electrochromic device with an active area of 100 cm 2 was successfully fabricated, demonstrating high modulation and uniform coloration capability. This work provides a new strategy and technical foundation for the design and practical development of high-performance solid-state deposition-type electrochromic devices.
研究领域:
材料科学
·
电化学
·
功能材料
·
纳米科技
·
表面科学
✓ 已验证
产品关联
DOI
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2023
·Vol. 33
·期 10
·2210043
·
IF 19
Yu Ji,Junpeng Xie,Zhaoxi Shen,Yu Liu,Zhaorui Wen,Lei Luo,Guo Hong
Aqueous rechargeable zinc–iodine batteries have received increasing attention in the field of portable electronics due to their high safety, low-cost, and great electrochemical performance. However, the insulated nature of iodine and the unrestricted shuttle effect of soluble triiodide seriously limit the lifespan and Coulombic efficiency (CE) of the batteries. Herein, a high-performance zinc–iodine energy storage system based on the hydrothermal reduced graphene oxide (rGO) and a high concentration zinc chloride water-in-salt electrolyte are promoted. The 3D microporous structures and outstanding electrical conductivity of rGO make it an excellent host for iodine, while the water-in-salt electrolyte effectively suppresses the shuttle effect of triiodide and improves the CE of the system. As a result, an ultra-high I 2 mass loading of 25.33 mg cm −2 (loading ratio of 71.69 wt.%) is realized during the continuous charging/discharging process. The batteries deliver a high capacity of 6.5 mAh cm −2 at 2 mA cm −2 with a much-improved CE of 95% and a prominent rate performance with capacity of 1 mAh cm −2 at 80 mA cm −2 . A stable long-term cycling performance is also achieved with capacity retention of 2 mAh cm −2 after 2000 cycles at 50 mA cm −2 .
研究领域:
储能
·
电化学
·
材料科学
·
电池技术
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）