Sulfur-terminated tin oxides for durable, highly reversible storage of large-capacity lithium

Dong, Chenlong; Dong, Wujie; Zhang, Qinghua; Huang, Xieyi; Gu, Lin; Chen, I.-Wei; Huang, Fuqiang

doi:10.1039/c9ta11330d

Cited by 11 publications

(9 citation statements)

References 31 publications

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“…The reduction peak at 1 V in the initial discharge process may be related to the decomposition of electrolyte and the formation of SEI. Other peaks can well correspond to the conversion and alloy reaction of Sn: (1) and (1′) Sn ↔ Li 4.4 Sn; (2) and (2′) SnO ↔ Sn and (3) and (3′) SnO 2 ↔ SnO [46]. The performances of the three samples under stepwise charge-discharge current from 0.2 to 8 A g −1 are shown in Fig.…”

Section: Resultsmentioning

confidence: 88%

“…At the same time, the SAED pattern exhibits ring-like diffractions with few diffraction dots, indicating the uniformity and small size nature of the obtained Sn. On the contrary, pure SnO 2 suffered from uncontrolled coarsening with sharp and discrete diffraction spots in the SAED pattern [24,46]. From HRTEM images, we can also identify the influential role of the Nb 2 O 5 coating.…”

Section: Resultsmentioning

confidence: 97%

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Achieving highly stable Sn-based anode by a stiff encapsulation heterostructure

Dong

et al. 2021

Sci. China Mater.

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Rationally designed heterostructures provide attractive prospects for energy storage electrodes by combining different active materials with distinct electrochemical properties. Herein, through a phase separation strategy, a heterostructure of SnO 2 encapsulated by amorphous Nb 2 O 5 is spontaneously synthesized. Insertion-type anode Nb 2 O 5 outer shell, playing as reaction containers and fast ionic pathways, physically inhibits the Sn atoms' migration and enhances the reaction kinetics. Moreover, strong chemical interactions are found at the SnO 2 /Nb 2 O 5 interfaces, which ensure the solid encapsulation of the SnO 2 cores even after 500 cycles. When used for lithium-ion batteries, this heterostructured anode exhibits high cycling stability with a capacity of 626 mA h g −1 after 1000 cycles at 2 A g −1 (85% capacity retention) and good rate performance with the capacity of 340 mA h g −1 at 8 A g −1 .

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Section: Resultsmentioning

confidence: 88%

Section: Resultsmentioning

confidence: 97%

Achieving highly stable Sn-based anode by a stiff encapsulation heterostructure

Dong

et al. 2021

Sci. China Mater.

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“…To relieve volume expansion of Sn, traditional carbon coating is proposed to avoid expansion, which ignore the irreversible conversion reaction and still impotent to eliminate the intimate contact of SnO 2 particles [5–7] . Another solution is to decrease the particle size and enhanced electronic conductivity of initial reactant, aiming at increasing the irreversibility of SnO 2 [3,6,8–10] . For instance, previously reported black conductive SnO 2‐x could improve initial capacity and cyclability, but still undergo phase relocation and coarsening because the newly formed SnO 2 particles are no longer reduced and conductive [11] …”

Section: Introductionmentioning

confidence: 99%

“…[5][6][7] Another solution is to decrease the particle size and enhanced electronic conductivity of initial reactant, aiming at increasing the irreversibility of SnO 2 . [3,6,[8][9][10] For instance, previously reported black conductive SnO 2-x could improve initial capacity and cyclability, but still undergo phase relocation and coarsening because the newly formed SnO 2 particles are no longer reduced and conductive. [11] To increase the reversibility, isotropic reaction with fast electron transport and ion diffusion is required.…”

Section: Introductionmentioning

confidence: 99%

Rod‐Like SnO₂/SnS Mosaics for Reversible Large‐Capacity Li‐Ion Storage

et al. 2022

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Hindering the phase aggregation and improving the electrochemical reversibility is a primary task of Sn-based anodes for lithium-ion storage. Constructing a mosaic structure is an alternative solution to accelerate the reaction kinetics and relieve the aggregation of Sn. Herein, a novel rod-like SnO 2 /SnS mosaic microstructure is proposed to obtain a reversible highcapacity anode. The microstructure is composed of alternative ionic conductive SnS blocks into SnO 2 nanodomains. Serving as an anode, the SnO 2 /SnS mosaic harvests a highly reversible capacity of 1182.5 mA h g À 1 after 50 cycles at 0.1 A g À 1 . At a relatively high current density, it delivers a stable capacity of 1271.9 mA h g À 1 after 600 cycles at 1 A g À 1 and a capacity of 657 mA h g À 1 after 300 cycles at 2 A g À 1 , which is superior to most reported Sn-based anodes. The soaring electrochemical performance could be attributed to highly reversible layerstructured SnS blocks with a fast channel for electron/Li + transfer.

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“…The doping of SnO 2 with transition metals (TMs) is also found to be helpful due to their high conductivities. 20 The 3d transition metals (Cu, Ni, Co, and Mn) can enable highly reversible conversion reactions when added to SnO 2 nanomaterials. 16,21,22 The added TM can be useful for inducing oxygen vacancies in SnO 2 in the lithiated electrode, resulting in an increased coulombic efficiency of more than 83%.…”

Section: Introductionmentioning

confidence: 99%