Vanadium-Tailored Silicon Composite with Furthered Ion Diffusion Behaviors for Longevity Lithium-Ion Storage

Abstract

As one of the promising anode materials, silicon has attracted much attention due to its high theoretical specific capacity (∼3579 mAh g–1) and suitable lithium alloying voltage (0.1–0.4 V). Nevertheless, the enormous volume expansion (∼300%) in the process of lithium alloying has a great negative effect on its cyclic stability, which seriously restricts the large-scale industrial preparation of silicon anodes. Herein, we design a facile synthesis strategy combining vanadium doping and carbon coating to prepare a silicon-based composite (V-Si@C). The prepared V-Si@C composite does not merely show improved conductivity but also improved electrochemical kinetics, attributed to the enlarged lattice spacing by V doping. Additionally, the superiority of this doping strategy accompanied by microstructure change is embodied in the relieved volume changes during the repeated charging/discharging process. Notably, the initial capacity of the advanced V-Si@C electrode is 904 mAh g–1 (1 A g–1) and still holds at 1216 mAh g–1 even after 600 cycles, showing superior electrochemical performance. This study offers an alternative direction for the large-scale preparation of high-performance silicon-based anodes.

Building better solid‐state batteries with silicon‐based anodes

“…As a semiconductor, both the intrinsic electronic conductivity and the ionic conductivity of Si are not sufficient. [ 96 ] For the thin film Si anode, the side effect of such insufficient ionic/electronic conductivity is acceptable, while for the sheet‐type Si anodes, this drawback must be conquered. Accordingly, the introduction of other components that can deliver high ionic conductivity or electronic conductivity in anodes is necessary for the design of Si‐SSBs.…”

Unveiling Challenges and Opportunities in Silicon‐Based All‐Solid‐State Batteries: Thin‐Film Bonding with Mismatch Strain

“…These approaches can be viewed from a microscopic and mesoscopic perspective. [38] Copyright 2023, American Chemical Society. b) Ge.…”

A V-doped W3Nb14O44 anode in a Wadsley–Roth structure for ultra-fast lithium-ion half/full batteries

“…Doping with alien ions has been demonstrated as an effective strategy to improve the electronic conductivity and Li + ion diffusion coefficient of intercalation-type electrode materials. [13][14][15][16][39][40][41][42][43][44][45][46][47][48][49][50][51][52][53][54] For instance, Lu's group successfully introduced Ru 4+ into micron-sized TiNb 2 O 7 powders through a solid-state reaction and the Ru 0.01 Ti 0.99 Nb 2 O 7 exhibited better cycling and rate properties than pure TiNb 2 O 7 . 15 Sun et al reported an interstitial and substitutional V 5+ -doped TiNb 2 O 7 microspheres with enhanced electronic conductivity and ionic conductivity.…”