Yang Lei,Lu Xige,Zhong Shuiping,Zhu Huanlin,Weng Wei,Tan Wen,Chi Xiaopeng
Copper foil roughness is widely regarded as an important factor affecting the performance of lithium-ion batteries, but relevant research still lacks systematic and in-depth analysis. In this paper, 6 μm copper foil is prepared by electrodeposition and compared with purchased 6 μm copper foil. The influence of different roughness on the battery performance is analyzed by the distribution of relaxation time (DRT). The results show that the roughness of homemade copper foil (1.69 μm) is slightly higher than that of purchased copper foil (1.53 μm). The initial charging specific capacity of the homemade copper foil electrode reaches 372.51 mAh g −1 , significantly higher than that of the purchased copper foil electrode (323.89 mAh g −1 ). DRT is used to analyze the electrochemical reaction kinetics of the batteries, it is found that the copper foil with a certain roughness can enhance its binding with the active substance, ensure stable and rapid conductive contact, reduce the side reaction caused by uneven lithiation, and minimize the increase in the impedance of each part during the electrode cycle, thereby ensuring stable battery operation. This study provides new insights into the application of copper foil in batteries and verifies the feasibility of homemade 6 μm copper foil.
Controlling substrate dissolution and film growth is critical to preparing high-quality coating. This study regulates surface structure and elemental composition by co-depositing elements and additives to prepare a conductive and corrosion-resistant ZrVC on AZ91 magnesium alloy. First-principles and Mott–Schottky analyses indicate that zirconium doping enhances electronic conductivity by increasing carrier concentration. The roles of co-deposited elements, oxidants, pH buffers, and promoters are evaluated through elemental composition and microstructural characterisation. The coating exhibits a contact resistance of 0.566 Ω·cm², a polarisation resistance increased by approximately 600 times, and a self-corrosion current density reduced by three orders of magnitude, with no corrosion detected after 132 h of neutral salt spray testing. The interfacial reaction mechanisms during coating formation and corrosion are further elucidated through DRT analysis.
Toxic lead-based dielectrics dominate high-performance capacitors, creating urgent environmental and supply-chain challenges. Multi-polar order engineering is deployed to create an industrially scalable lead-free perovskite achieving simultaneous record efficiency (η ≈ 95%) and energy density (12 J cm −3 ). Phase-field simulations are also used to guide micro-to-nano domain design to construct switchable polar nano region that delay polarization saturation. Crucially, sub-angstrom electronic state optimization – previously unexplored in energy storage dielectrics – is revealed as pivotal: synchrotron XAS quantifies Nb-O dipole ionicity enhancement via electronic polarization, while atomic-resolution electron microscopy statistically confirms bond-length homogenization and distortion reduction that structurally anchor this effect. This hierarchical atomic-to-electronic control reshapes the electrical microstructure, enabling unified charge dynamics (validated by DRT analysis) that deliver ultrafast field response (<32 ns discharge) and exceptional thermal resilience (< ±4% current fluctuation, 25–150 °C). Fabricated from commodity precursors, the material eliminates the reliance on rare-earth precursors that are common in PLZT production, significantly lowering costs while mitigating environmental impacts. Overall, this work establishes a sustainable pathway for grid-scale power electronics.
危险品化学品经营许可证（带存储）