Diffusion-Controlled Porous Crystalline Silicon Lithium Metal Batteries

• Published in: iScience Vol. 23; no. 10; p. 101586
• Main Authors: Collins, John, de Souza, Joel P., Hopstaken, Marinus, Ott, John A., Bedell, Stephen W., Sadana, Devendra K.
• Format: Journal Article
• Language: English
• Published: Elsevier Inc 23.10.2020; Elsevier
• Subjects: Electrochemical Energy Storage; Energy Engineering; Energy Materials; Materials Science; Energy Engineering; Energy Materials; Materials Science; Electrochemical Energy Storage
• ISSN: 2589-0042; 2589-0042
• DOI: 10.1016/j.isci.2020.101586

Nanostructured porous silicon materials have recently advanced as hosts for Li-metal plating. However, limitations involve detrimental silicon self-pulverization, Li-dendrites, and the ability to achieve wafer-level integration of non-composite, pure silicon anodes. compo. Herein, full cells featuring low-resistance, wafer-scale porous crystalline silicon (PCS) anodes are embedded with a nanoporous Li-plating and diffusion-regulating surface layer upon combined wafer surface cleaning (SC) and anodization. LL Lithiophilic surface formation is illustrated via correlation of surface groups and X-ray structure. Low-cost SC-PCS anodes require no composite formulation, and pre-lithiation enables sustainable Li-metal plating/stripping on the lithiophilic surface and in SC-PCS bulk nanostructure. Anodization time and C-rate determined competitive full cell performance: NMC811 | 4800 s SC-PCS: 195 mAh/g (99.9% coulombic efficiency [C.E.], C/3, 50 cycles), 165 mAh/g, 587 Wh/kg (97.1% C.E., C/3 and C/2 rate, 350 cycles), 24 Ω∗cm2 SC-PCS-resistivity (900 cycles); 160 μm LCO | 500 s SC-PCS: 102 mAh/g (94.1% C.E., 1C, 350 cycles). [Display omitted] •Porous crystalline silicon (PCS) anodes were seamlessly integrated in silicon wafers•A diffusion-controlling lithiophilic anode surface was created during fabrication•Full cells delivered energy dense performance: 169mAh/g, 587 Wh/kg for 300 cycles•Non-hazardous, pure silicon Li-metal-host anodes at industry-pace throughput Electrochemical Energy Storage; Energy Engineering; Energy Materials; Materials Science