Heading towards novel superior silicon-based lithium-ion batteries: ultrasmall nanoclusters top-down dispersed over synthetic graphite flakes as binary hybrid anodes

Abstract

A prominent anodic material of silicon ultranano particles (SiUPs, size < 10 nm) using recycled Si wafer fractures as raw materials and further improvement called top-down dispersion for highcapacitive Li-ion batteries has been addressed originally in this work. Economic benefits and outstanding electrochemical properties, including shorter Li-ion diffusive paths and low-strained effects as a result of the unique ultra-nanometric structure, enable such SiUPs to possess superior advantages for scalable manufacturing procedures as compared to other nanometric Si powders and become the priority of starting materials for Si-based anodes potentially. Meanwhile, an advanced top-down dispersive process has been optimized systematically to prevent severe particles aggregations to ameliorate the electrochemical performance of SiUPs electrodes. In addition to avoiding pre-aggregations, this top-down dispersion brings in adequate buffer spaces, constructed by dispersive media (graphite flakes) and well-dispersive ultrasmall SiUPs nanoclusters (size < 100 nm), alleviating drastic volume variation and local stress during cycling. These improved SiUPs electrodes maintained 1200 mAh g -1 sepcific capacity over 300 cycles under a high current density of 0.8 A g -1 , coupled with ca. 98.5% reversibility. On the basis of these advantages, including low cost, facile manufacture and high performance, this original method provides a pathway to achieve commercial high-capacitive Si-C composite anodes for Li-ion batteries.Please do not adjust margins Please do not adjust margins materials to exclude the simultaneous in-situ powderization and topdown dispersion process. These comparative experiments highlighted the positive effect of the in-situ powderization and topdown dispersion on the electrochemical properties.

Well-constructed silicon-based materials as high-performance lithium-ion battery anodes

“…47,51,[62][63][64][65][66][67] Their practical implementation is also limited by the low tap density, resulting in a low volumetric energy density. 25,[54][55][56]66,68,69 In response to these new problems, Si nanomaterials are usually subjected to subsequent processes to change them to anchored, flexible, sandwich, core-shell, porous, or even integrated structures. Besides, a bottom-to-up approach is proposed by assembling Si nano-materials into large-sized Si-based anodes to increase the tap/ packing density.…”

Strongly Coupled W2C Atomic Nanoclusters on N/P‐Codoped Graphene for Kinetically Enhanced Sulfur Host

“…With the broad and surging development of energy‐density technologies, atomic nanoclusters have been remarkably deployed to the application of energy storage and conversion in expectation to solve intrinsic problems or make better the performance, such as metal–air batteries . On the other hand, by investigation, a lot of metal oxide/sulfide “nanoclusters” served as electrode materials for lithium/potassium/magnesium ion batteries . Li et al reported the nitrogen‐doped graphene loaded with MoS 2 nanoclusters, which displayed better adhesion effect for sulfur in lithium–sulfur batteries .…”