In Situ Formed Weave Cage-Like Nanostructure Wrapped Mesoporous Micron Silicon Anode for Enhanced Stable Lithium-Ion Battery

Abstract

The low-cost and high-capacity micron silicon is identified as the suitable anode material for high-performance lithium-ion batteries (LIBs). However, the particle fracture and severe capacity fading during electrochemical cycling greatly impede the practical application of LIBs. Herein, we first proposed an in situ reduction and template assembly strategy to attain a weave cage-like carbon nanostructure, composed of short carbon nanotubes and small graphene flakes, as a flexible nanotemplate that closely wrapped micron-sized mesoporous silicon (PSi) to form a robust composite construction. The in situ formed weave cage-like carbon nanostructure can remarkably improve the electrochemical property and structural stability of micron-sized PSi during deep galvanostatic cycling and high electric current density owing to multiple attractive advantages. As a result, the rechargeable LIB applying this anode material exhibits improved initial Coulombic efficiency (ICE), excellent rate performance, and cyclic stability in the existing micron-sized PSi/nanocarbon system. Moreover, this anode reached an approximation of 100% ICE after only three cycles and maintains this level in subsequent cycles. This design of flexible nanotemplated platform wrapped micron-sized PSi anode provides a steerable nanoengineering strategy toward conquering the challenge of long-term reliable LIB application.

Silicon micron cages derived from a halloysite nanotube precursor and aluminum sacrificial template in molten AlCl3 as an anode for lithium-ion batteries

“…Besides, while the current density returns to 0.1 A g À1 , the reversible capacity of SMCs can immediately recover to 1881.8 mA h g À1 , suggesting excellent rate capability. A discharge specic capacity of 1035.1 mA h g À1 aer 300 cycles for SMCs electrode at a higher current density of 1.0 A g À1 was attained, which is higher than the values from the most recent reports [6][7][8][9]11,15,[22][23][24] (for detailed data, see Table S1 †). Compared with the third cycle, the capacity retention of the 300th cycle is 46.4%.…”

Diatomic-doped carbon layer decorated Na3V2(PO4)2F3as a durable ultrahigh-stability cathode for sodium ion batteries

“…2 Lithiumion batteries (LIBs) have been proverbially studied and widely used in various energy storage fields. [3][4][5] However, the large consumption of lithium resources and the limited reserves of lithium resources have led to the rapid increase of lithium costs, which has further restricted the vigorous development of LIBs. 6 There is an exigent need to promote new energy storage systems to overcome the problem of insufficiency of existing lithium resources and to replace LIBs in many applications.…”

Optimizations of Graphitic Carbon/Silicon Hybrids for Scalable Preparation with High-Performance Lithium-Ion Storage

“…Liu et al designed yolklike nanoscale Si/C assembled pomegranate-like particles with a micrometer size, which exhibits a high tap density of 0.53 g cm –3 and a robust capacity retention (1000 cycles with 97% capacity retention). Fang et al fabricated a cagelike nanostructured carbon wrapped porous Si anode though in situ reduction and template assembly strategy, exhibiting outstanding long-term stability. However, compared to the graphite anode, all these Si/C composites with novel structures always show low CE, and their synthesis procedures are tedious.…”

“…Liu et al 32 designed yolklike nanoscale Si/C assembled pomegranate-like particles with a micrometer size, which exhibits a high tap density of 0.53 g cm −3 and a robust capacity retention (1000 cycles with 97% capacity retention). Fang et al 33 Si/C composites with novel structures always show low CE, and their synthesis procedures are tedious.…”