Boron-doped porous Si anode materials with high initial coulombic efficiency and long cycling stability

Abstract

B-Doped pSi exhibits an exceptionally high initial coulombic efficiency of 89% and shows outstanding cycling performance (reversible capacity of 1500 mA h g−1 at 2 A g−1 after 300 cycles).

Top‐Down Synthesis of Silicon/Carbon Composite Anode Materials for Lithium‐Ion Batteries: Mechanical Milling and Etching

“…To achieve high‐energy LIBs, the optimization of parameters such as the particle size, morphology, composition, ionic diffusion pathways, conductivity, as well as surface characteristics of electrode materials is of paramount importance. Porous Si‐based materials can be considered as promising anodes for high‐energy‐density LIBs due to their excellent electrochemical performance . Porous Si was first unintentionally discovered in the 1950s by Bell Laboratories, and then attracted tremendous research interests in 1990s .…”

Infinitesimal sulfur fusion yields quasi-metallic bulk silicon for stable and fast energy storage

“…Lithium sulfide-embedded structure. While the most dopants in single atomic sites hardly achieve a full intercalation of Li compared with its bulk crystal structure and normally considered as dead sites for Li reactions 37,38 , the unusual doping nature of QMS will adopt different ways. The fused sulfur in either forms should be discharged (lithiated), at least for the first cycle, with a narrow voltage window that limits subsequent charging (delithiation), thereby indicating the possible formation of lithium sulfide 39 .…”

Interface Heteroatom‐doping: Emerging Solutions to Silicon‐based Anodes

“…(k) Cycling performance of B‐doped pSi and pSi electrodes at 1 A g −1 . Reprinted with permission from ref . Copyright 2018, Royal Society of Chemistry.…”

“…In addition to doping boron into Si/C composite, B‐doped Si is another effective approach to enhance the conductivity of Si‐based electrode. Chen et al . prepared highly crystalline conductive B‐doped porous Si (B‐doped pSi) by the air‐oxidation demagnesiation of Mg 2 Si from p‐type Si wafers.…”

“…In addition, the incorporation of B into the carbon framework increases the graphitization degree of carbon, thereby facilitating the lithium insertion/extraction process. From the previously reported literature, it is generally believed that optimum B‐doping content (about 5 at %) can obtain the best electrochemical performance …”