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首页> 外文期刊>Advanced energy materials >A Paradigm of Calendaring-Driven Electrode Microstructure for Balanced Battery Energy Density and Power Density
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A Paradigm of Calendaring-Driven Electrode Microstructure for Balanced Battery Energy Density and Power Density

机译：A Paradigm of Calendaring-Driven Electrode Microstructure for Balanced Battery Energy Density and Power Density

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The microstructure of an electrode plays a critical role in the electrochemicalperformance of lithium-ion batteries, including the energy and power density.Using a micrometer-scale Wadsley–Roth phase TiNb_2O_7 active materialwith Li intercalation chemistry as a model system, the relationship betweenelectrochemical performance and microstructure of calendared electrodeswith same mass loading but different electrode parameters is studied by bothexperimental investigation and theoretical modeling, providing a paradigmof calendaring-driven electrode microstructure for balanced battery energydensity and power density. Along with the reduction in porosity, ion andelectron diffusion distance decreases, which is beneficial for charge transferand rate capability. Nevertheless, the narrowed ion diffusion pathwayincreases the resistance for ion diffusion. The rate capability, volumetriccapacity, and materials utilization are thus predominantly restricted bythe microstructures of the electrode, providing fundamental insights intoelectrode microstructure design for different applications. As an example,an optimized TiNb_2O_7 electrode with compaction density of ≈2.5 g cm~(-3) andmass loading of ≈8.5 mg cm~(-2) provides the highest specific charge capacityof 271.3 mAh g~(-1) at 0.2 C in half cell configuration and 70.4% capacityretention at 6 C in full configuration, enabling balanced energy density andpower density of batteries.

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