Advanced asymmetric supercapacitor device is fabricated, containing negative Ti ₃ C ₂ T _x –carbon nanotube and positive polypyrrole coated carbon nanotube electrodes, prepared using advanced colloidal techniques.

Rechargeable aqueous zinc‐ion batteries (RAZBs), considered for grid‐level energy storage, have drawn intensive attention due to their intrinsic safety, earth abundance, and low cost of electrode materials. However, the practical application of RAZBs is severely impeded by the uncontrollable hydrogen evolution reaction, serious self‐corrosion, and uneven zinc deposition. Herein, the study proposes a multifunctional electrolyte additive to form in situ a protective layer on zinc surface, providing a buffering ability of maintaining the stable pH around anode/electrolyte interface and thus inhibiting hydrogen evolution reaction. Additionally, the modified Zn anode shows the preferred orientation growth of (101) plane, inheriting the merits of dense deposition morphology and superior stability. Consequently, the Zn||Zn symmetric cell demonstrates a remarkable life span up to 4000 h (1 mA cm ⁻² , 1 mA h cm ⁻² ) and 1300 h (5 mA cm ⁻² ,1 mA h cm ⁻² ). After cycling over 1500 h, the Zn||Cu half cell shows a high coulombic efficiency for nearly 100%, verifying the extraordinary Zn stripping/plating reversibility. The as‐assembled Zn||MnO ₂ full battery shows good electrochemical characteristics, surpassing the bare cell without the additive. This investigation features a facile yet effective strategy for ultradurable Zn anode design and sheds the light on designing practical rechargeable metal batteries.

This investigation is motivated by increasing interest in the development of magnetically ordered pseudocapacitors (MOPC), which exhibit interesting magnetocapacitive effects. Here, advanced pseudocapacitive properties of magnetic CuFe₂O₄ nanoparticles in negative potential range are reported, suggesting that CuFe₂O₄ is a promising MOPC and advanced negative electrode material for supercapacitors. A high capacitance of 2.76 F cm⁻² is achieved at a low electrode resistance in a relatively large potential window of 0.8 V. The cyclic voltammograms and galvanostatic charge–discharge data show nearly ideal pseudocapacitive behavior. Good electrochemical performance is achieved at a high active mass loading due to the use of chelating molecules of ammonium salt of purpuric acid (ASPA) as a co-dispersant for CuFe₂O₄ nanoparticles and conductive multiwalled carbon nanotube (MCNT) additives. The adsorption of ASPA on different materials is linked to structural features of ASPA, which allows for different interaction and adsorption mechanisms. The combination of advanced magnetic and pseudocapacitive properties in a negative potential range in a single MOPC material provides a platform for various effects related to the influence of pseudocapacitive/magnetic properties on magnetic/pseudocapacitive behavior.

Lithium-ion batteries that use lithium iron phosphate (LiFePO₄) as the cathode material and carbon (graphite or MCMB) as the anode have gained significant attention due to their cost-effectiveness, low environmental impact, and strong safety profile. These advantages make them suitable for a wide range of applications including electric vehicles, stationary energy storage, and backup power systems. However, their adoption is hindered by a critical challenge: capacity degradation at elevated temperatures. This review systematically summarizes the corresponding modification strategies including surface modification of the anode and cathode as well as modification of the electrolyte, separator, binder, and collector. We further discuss the control of the charge state, early warning prevention, control of thermal runaway, and the rational application of ML and DFT to enhance the LFP/C high temperature cycling stability. Finally, in light of the current research challenges, promising research directions are presented, aiming at enhancing their performance and stability in such harsh thermal environments.

MXenes, such as Ti₃C₂T_x, are promising materials for electrodes of supercapacitors (SCs). Colloidal techniques have potential for the fabrication of advanced Ti₃C₂T_x composites with high areal capacitance (C_S). This paper reports the fabrication of Ti₃C₂T_X-Fe₃O₄-multiwalled carbon nanotube (CNT) electrodes, which show C_S of 5.52 F cm⁻² in the negative potential range in 0.5 M Na₂SO₄ electrolyte. Good capacitive performance is achieved at a mass loading of 35 mg cm⁻² due to the use of Celestine blue (CB) as a co-dispersant for individual materials. The mechanisms of CB adsorption on Ti₃C₂T_X, Fe₃O₄, and CNTs and their electrostatic co-dispersion are discussed. The comparison of the capacitive behavior of Ti₃C₂T_X-Fe₃O₄-CNT electrodes with Ti₃C₂T_X-CNT and Fe₃O₄-CNT electrodes for the same active mass, electrode thickness and CNT content reveals a synergistic effect of the individual capacitive materials, which is observed due to the use of CB. The high C_S of Ti₃C₂T_X-Fe₃O₄-CNT composites makes them promising materials for application in negative electrodes of asymmetric SC devices.