Supercapacitors have attracted extensive attention due to their advantages of high energy density, low cost and long cycle life. However, the key to affect the performance of supercapacitors lies in the electrode materials. The layered bimetallic hydroxides (LDHs), transition metal sulfides (TMSs), transition metal phosphides (TMPs) and transition metal oxides (TMOs) dominated by Ni and Mn elements have good electrochemical performance when they are used as electrode materials. The preparation methods of NiMn-based electrode materials, including hydrothermal method, electrodeposition method, sol-gel method, metal-organic frameworks (MOFs) derivation method, coprecipitation method, electrospinning method and so on, are reviewed in this paper. The carbon material modification of NiMn-based electrode materials is introduced from aspects such as graphene and its derivatives, carbon nanotubes, activated carbon, and biomass derived carbon. At the same time, the structure control strategies of NiMn-based composites are introduced, and the design strategies of two-dimensional and three-dimensional materials are systematically discussed, such as layer structure, heterostructure, Nano-flower structure, core-shell structure, etc. In particular, the research progress of NiMn-based electrode materials for asymmetric supercapacitors is introduced in detail, and their electrochemical properties in different applications are discussed. Finally, the current challenges and future development directions of NiMn-based electrode materials are discussed. 

Rational design of NiMn-based electrode materials for high-performance supercapacitors

Boron-doped g-CN monolayer as a promising anode for Na/K-ion batteries

Density functional theory simulations were performed to investigate the structural, electronic, and electrochemical properties of the two-dimensional α-SiX (X = N, P) monolayers as anode material in Li-ion batteries (LIBs). Our result indicates that α-SiX monolayers have excellent mechanical, dynamical, and thermal stability. The obtained adsorption energy values suggest that the Li atom adsorption over α-SiX is a favorable process. According to the Löwdin charge transfer and partial density of states analysis, charge transfer takes place from Li atom to α-SiX monolayers. From the band structure plots, we observed that after the adsorption of a single Li atom, the α-SiX monolayers are converted into a metallic state from the semiconductor state and remain in the metallic state for the different adsorption concentrations of Li atoms, which is essential to facilitate the diffusion of stored electrons. The calculated specific storage capacity is 956.16 and 733.66 mA h g–1 for α-SiN and α-SiP monolayers, respectively, which is remarkably higher than that of the conventional anode materials (such as graphite and TiO2). Ab initio molecular dynamics simulations confirm the room-temperature stability of the α-SiX monolayers at the maximum loading of Li atoms. The lower diffusion energy barriers of 0.30 eV (for α-SiN monolayers) and 0.16 eV (for α-SiP monolayers) ensure good diffusivity of ions over monolayers. The calculated open-circuit voltage is also favorable for battery applications. The aforementioned findings suggest that the α-SiX monolayers could be beneficial and compelling host anode material for high-performance LIBs. 

Two-Dimensional α-SiX (X = N, P) Monolayers as Efficient Anode Material for Li-Ion Batteries: A First-Principles Study

The development of electric vehicles has received worldwide attention in the background of reducing carbon emissions, wherein lithium-ion batteries (LIBs) become the primary energy supply systems. However, commercial graphite-based anodes in LIBs currently confront significant difficulty in enduring ultrahigh power input due to the slow Li+ transport rate and the low intercalation potential. This will, in turn, cause dramatic capacity decay and lithium plating. The 2D layered materials (2DLMs) recently emerge as new fast-charging anodes and hold huge promise for resolving the problems owing to the synergistic effect of a lower Li+ diffusion barrier, a proper Li+ intercalation potential, and a higher theoretical specific capacity with using them. In this review, the background and fundamentals of fast-charging for LIBs are first introduced. Then the research progress recently made for 2DLMs used for fast-charging anodes are elaborated and discussed. Some emerging research directions in this field with a short outlook on future studies are further discussed.

2D Layered Materials for Fast-Charging Lithium-Ion Battery Anodes.

Density functional theory (DFT) calculations were employed to probe the feasibility of 2D α-CM (M = N, P) as an anode material for Li-ion batteries (LIBs). Our findings demonstrate the dynamical, mechanical and thermal stability of 2D α-CM. In particular, for the 2D α-CP adsorbed with Li atom, binding energy (EB) of −2.00 eV ensures favourable adsorption. In contrast to 2D α-CP, the EB of adsorbed Li atom over α-CN is lower than the cohesive energy of lithium metal, this eliminates the accessibility of 2D α-CN as an anode in LIBs. The Li atom adsorption changes the nature of the 2D α-CP from semiconducting to metallic, ensuring high electronic conductivity. Both partial density of states and Lo¨wdin charge analysis indicate substantial charge transfer from Li atom to 2D α-CP after adsorption. The multilayer adsorption on both sides of 2D α-CP yields Li5.0CP monolayer with remarkably high specific storage capacity (1108.91 mAhg−1). The obtained average open circuit voltage is suitable for extensive battery application. Diffusion barrier of 0.11 eV shows ultrahigh ionic mobility over the 2D α-CP and thus facilitates charging/discharging process. As a result, high specific storage capacity, lower diffusion barrier, negligible volume change and excellent electronic conductivity imply the promising utility of 2D α-CP as anodic material in LIBs. 

A density functional theory study on the assessment of α-CN and α-CP monolayers as anode material in Li-ion batteries

Two-dimensional SiP3 Monolayer as Promising Anode with Record-high Capacity and Fast Diffusion for Alkali-ion Battery

Hierarchical NiMn/NiMn-LDH/ppy-C induced by a novel phase-transformation activation process for long-life supercapacitor.

Metallic 1H-BeP2 monolayer as a potential anode material for Li-ion/Na-ion batteries: A first principles study

Synergistic Contribution to the Enhanced Charge Transfer of the Silver/4-Mercaptobenzoic Acid/Polyaniline (Ag/MBA/PAN) System: Thickness-Dependent of PAN

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Papers

Two-dimensional SiP3 Monolayer as Promising Anode with Record-high Capacity and Fast Diffusion for Alkali-ion Battery

Hierarchical NiMn/NiMn-LDH/ppy-C induced by a novel phase-transformation activation process for long-life supercapacitor.

Metallic 1H-BeP2 monolayer as a potential anode material for Li-ion/Na-ion batteries: A first principles study

Synergistic Contribution to the Enhanced Charge Transfer of the Silver/4-Mercaptobenzoic Acid/Polyaniline (Ag/MBA/PAN) System: Thickness-Dependent of PAN