Abstract Distribution of Relaxation Times (DRT) analysis is a mathematical deconvolution technique that converts electrochemical impedance spectroscopy (EIS) data from the frequency domain into a time-domain distribution function \(\gamma(\tau)\)— separating overlapping electrochemical processes into distinct peaks based on their characteristic…
Abstract Longitudinal binder migration during the drying process creates compositional stratification that directly impacts the electrochemical performance, adhesion strength, and cycle life of lithium-ion batteries. Traditional manual scraping methods lack the spatial resolution and depth accuracy required to accurately map…
1. What Is Electrode Characterization and Why Does It Matter? Electrode characterization in lithium-ion batteries refers to the systematic, quantitative evaluation of an electrode sheet’s electrical conductivity distribution, electrolyte wettability, and mechanical integrity to predict cell-level performance. Inadequate electrode uniformity,…
Abstract Specific capacity in coin cell testing is the electrical charge released by an electrode material per gram of active material, calculated as Specific Capacity (mAh/g) = Capacity (mAh) ÷ Active Material Mass (g) — for example, 1,000 mAh from a 10 g…
Abstract The relationship between SOH (state of health) and degradation modes is that as a lithium-ion cell ages and its SOH declines, irreversible expansion force and displacement increase steadily and cumulatively, because SEI growth, electrode plastic deformation, and micro-structure compaction each…
1. Introduction As lithium-ion batteries become ubiquitous in electric vehicles, energy density, cycle life, safety, and cost remain the primary concerns. During cycling, cathode active materials — particularly Ni-rich NCM — undergo repeated lithium intercalation and deintercalation, accompanied by anisotropic…
Abstract Double-layer (dual-layer) coating is a graphite anode manufacturing technique in which a top layer of small-particle, rate-capable graphite (near the separator) and a bottom layer of large-particle, high-compaction graphite (near the current collector) are applied to balance power density…
1. Introduction Silicon stands out as a highly promising anode material for lithium‑ion batteries due to its theoretical specific capacity of 4200 mAh g⁻¹ and environmental friendliness. However, its practical application faces severe obstacles: high volume expansion (>300%), low electronic conductivity, and…
Abstract A P2/O3 mixed phase cathode is designed to combine the rapid Na-ion transport of P2 domains with the high initial sodium content and high-voltage stability of O3 domains, improving the balance among capacity, rate capability, and cycling stability in…
1. Introduction As the new energy market expands and application scenarios diversify, sodium‑ion batteries have attracted considerable attention due to the abundant sodium resources and low material cost. They show strong potential in large‑scale energy storage, low‑speed electric vehicles, and…
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