High-performance LiFePO4 and SiO@C/graphite interdigitated full lithium-ion battery fabricated via low temperature direct write 3D printing

Lithium-ion batteries (LIBs) composed of thin tape-casted electrodes face some intrinsic challenges especially the trade-off between energy density and power density. Three-dimensional (3D) structural batteries fabricated by 3D printing have the potential to overcome this challenge. Silicon oxide-based materials are promising candidates for the next-generation high-performance LIBs. In this study, interdigitated full batteries composed of comb-like LiFePO4 3D cathodes and comb-like SiO@C/graphite 3D anodes are fabricated via low temperature direct writing 3D printing process. The 3D printing at a low temperature of below -20 degrees C enables the 3D-printed SiO@C/graphite electrodes obtain a high porosity of similar to 60% and tri-modally hierarchical porous microstructure. Comb-like 3D SiO@C/graphite anodes with the thickness of similar to 418 mu m, similar to 692 mu m, and similar to 806 mu m and corresponding mass loading of similar to 39.2 mg cm(-2), similar to 60.9 mg cm(-2) , similar to 84.3 mg cm(-2), respectively, are fabricated to evaluate their electrochemical performance. These thick 3D electrodes display impressive areal capacities of similar to 17.9, similar to 26.7, and similar to 33.2 mA h cm(-2) @ 0.3 C depending on their electrode thickness. Coupled with comb-like LiFePO4 3D cathodes, interdigitated full batteries with two N/P ratios of 0.91 and 0.82 are fabricated. These full batteries exhibit high energy density, high power density, and stable cycling performance. (C) 2022 Elsevier Ltd. All rights reserved.

Automated summary

The study demonstrates the fabrication of interdigitated full batteries composed of comb-like LiFePO4 3D cathodes and comb-like SiO@C/graphite 3D anodes using low temperature direct writing 3D printing. The thick 3D electrodes exhibit impressive areal capacities and when coupled with comb-like LiFePO4 3D cathodes, the full batteries show high energy density, high power density, and stable cycling performance.