ChemElectroChem
·
2019
·Vol. 6
·期 17
·4437-4443
·
IF 3.975
Yiqun Du,Shimeng Zhao,Cheng Xu,Wenyang Zhang,Shuming Fan,Pan Li,Huixin Jin,Youjian Zhang,Jianxin Zhang
Graphical Interc-Al-ation for batteries : A high-capacity cathode with porous α-MnSe is designed for rechargeable aluminum batteries. The fundamental reaction mechanism of the α-MnSe cathode is deeply researched in the manuscript. The synergistic effect of nanostructure and porosity could efficiently mitigate volume changes of the α-MnSe and enhance intercalation kinetics of Al 3+ , which sheds new light on the establishment of advanced energy-storage devices. Aluminum batteries (ABs) have been considered as a viable candidate for new-generation energy-storage devices due to its low cost and high theoretical volumetric capacity. Despite these advantages, the large-scale application of ABs is constrained by scarce options of suitable cathode materials. Herein, three-dimensional nanostructured α-MnSe microspheres with porous properties are reported as a cathode for ABs. The nanosized and porous structure of α-MnSe could offer numerous open channels and the short ionic transport path, which would efficiently mitigate volume changes and enhance electrochemical reaction kinetics. Moreover, the pseudocapacitive characteristic of Al 3+ storage in α-MnSe contributes to the fast kinetics of the cathode. It is demonstrated that the reversible Al 3+ insertion/extraction occurs in the α-MnSe cathode during the cycling process. The resulting aluminum battery based on the α-MnSe cathode, AlCl 3 /[EMIm]Cl ionic liquid electrolyte, and aluminum anode exhibits an ultrahigh reversible capacity of 408 mA h g −1 at 0.2 A g −1 . Even for a current density at 1 A g −1 , a discharge capacity of 131 mA h g −1 could be retained with a Coulombic efficiency of 97 % over 150 cycles. This strategy has referential significance in aspects of the selection of compatible cathode for ABs.
研究领域:
材料科学
·
电化学
·
能量存储
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2019
·
IF 4.175
Peng Zhou,Libao Chen,Mingyu Zhang,Qizhong Huang,Chao Cui,Xiu Li,Liping Wang,Liewu Li,Cheng Yang,Yuhao Li
Long-cycle-life and high-capacity nitrogen-doped carbon-coated α-MnSe nanofibers (α-MnSe/N-CNFs) electrodes were prepared by using an electrospinning process. The one-dimensional structural of α-MnSe/N-CNFs possesses great stability and play a key role in obtaining a long-cycle life for lithium-ion batteries. With nitrogen doping, improved pseudocapacitive behavior and conductivity were observed and the reversible capacity of the was increased to 956.3 mA h g −1 at 0.2 A g −1 after 200 cycles. The discharge capacity of α-MnSe/N-CNFs after 500 cycles reached 613.0 mA h g −1 even at a high current density of 1 A g −1 . The excellent electrochemical performance of α-MnSe/N-CNFs holds great promise as a candidate anode material for high-performance lithium-ion batteries.
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
CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Ting Li,Yikun Wang,Lingling Yuan,Qianwen Zhou,Shuangyan Qiao,Zhengqing Liu,Shaokun Chong
Conversion mechanism anode materials have been widely employed for potassium ion batteries (PIBs) due to high theoretical specific capacities. However, large volume expansion and poor electrochemical kinetics have become the key bottlenecks hindering its further development. Herein, α-MnSe nanorods wrapped by N-doped carbon and graphene (α-MnSe@NC@graphene) are constructed as anode materials for PIBs . The architecture can not only provide superior electrode integrity to buffer volume variation and maintain structure stability via synergistic effects of physical encapsulation and Mn-C chemical bonding, but also serve as conductive network to accelerate the electron transfer and K-ion diffusion. As a result, α-MnSe@NC@graphene composite delivers high initial charge specific capacity of 307.9 mAh·g −1 and great cycling stability over 250 cycles with the capacity retention of 232.8 mAh·g −1 at 50 mA·g −1 . Besides, superior rate capability (91.1 mAh·g −1 at 2.0 A·g −1 ) and long lifespan over 700 cycles at 1.0 A·g −1 with the low capacities decay rate of 0.064% per cycle can be acquired. Ex situ TEM and XPS results verify that K-ion insert into/extract from α-MnSe@NC@graphene through a conversion mechanism based on the Mn-ion redox site (MnSe + 2 K + + 2e - ↔ Mn + K 2 Se).
研究领域:
材料科学
·
电化学
·
纳米能源
·
储能技术
·
无机功能材料
·
先进电池技术
✓ 已验证
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2022
·
IF 6.371
Lirong He,Peng Zhou,Liping Wang,Mingyu Zhang,Qizhong Huang,Zhean Su,Xiaodong Wang,Ping Xu,Weijie Song,Renhao Zou
Improving the performance of anode materials is of great importance for lithium-ion batteries (LIBs). Transition metal selenides compositing carbon and germanium (Ge) have attracted extensive attention. In this work, an anode material that integrates Ge and α-MnSe in carbon nanofibers (CNFs) was first synthesized by heat treatment after electrospinning. The coupling of Ge with α-MnSe and carbon can cause the growth process of α-MnSe to occur inside the CNFs, which can buffer the volume change, refine the grains and avoid particles protruding from the surface of CNFs. In addition, the interconnected conductive network of Ge/α-MnSe@CNFs can provide fast diffusion channels for Li ions and improve the electrical conductivity . Importantly, there is a synergistic effect of Ge, α-MnSe, and CNFs on the anode material for LIBs. As expected, Ge/α-MnSe@CNFs exhibited an excellent performance with a capacity of 1514.7 mAh g −1 after 200 cycles at 0.1 A g −1 and 1030 mAh g −1 after 1000 cycles even at 1 A g −1 . Therefore, this new preparation strategy of Ge/α-MnSe@CNFs offers novel ideas to develop high-performance and long-life LIBs.
研究领域:
材料科学
·
电化学
·
纳米技术
·
能源存储
✓ 已验证
DOI
高影响因子
Results in Physics
·
2023
·
IF 5.3
Meijie Zhu,Hua Xu,Zuoquan Tan,Le Wang
Large-area and uniform two-dimensional (2D) non-layered α-MnSe was successfully synthesized via the molecular sieve modified chemical vapor deposition (CVD). The molecular sieve serves both as a filter and a container to controllable release the Mn precursor in a stable and much lower concentration, leading to the uniform growth of 2D α-MnSe flakes. The thickness, crystalline quality and uniformity of the as-grown α-MnSe are further characterized. Our study validated the positive role of molecular sieve in the controllable growth of 2D α-MnSe, which is believed to be applicable to other non-layered transition metal chalcogenides (TMCs) and will be beneficial for their further applications in electronics, optoelectronics and spintronics.
研究领域:
材料科学
·
纳米科技
·
凝聚态物理
·
无机化学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）