S-doped porous carbon confined SnS nanospheres with enhanced electrochemical performance for sodium-ion batteries

Wang

et al. 2019

Small

The lithium and sodium storage performances of SnS anode often undergo rapid capacity decay and poor rate capability owing to its huge volume fluctuation and structural instability upon the repeated charge/discharge processes. Herein, a novel and versatile method is described for in situ synthesis of ultrathin SnS nanosheets inside and outside hollow mesoporous carbon spheres crosslinked reduced graphene oxide networks. Thus, 3D honeycomb‐like network architecture is formed. Systematic electrochemical studies manifest that this nanocomposite as anode material for lithium‐ion batteries delivers a high charge capacity of 1027 mAh g−1 at 0.2 A g−1 after 100 cycles. Meanwhile, the as‐developed nanocomposite still retains a charge capacity of 524 mAh g−1 at 0.1 A g−1 after 100 cycles for sodium‐ion batteries. In addition, the electrochemical kinetics analysis verifies the basic principles of enhanced rate capacity. The appealing electrochemical performance for both lithium‐ion batteries and sodium‐ion batteries can be mainly related to the porous 3D interconnected architecture, in which the nanoscale SnS nanosheets not only offer decreased ion diffusion pathways and fast Li+/Na+ transport kinetics, but also the 3D interconnected conductive networks constructed from the hollow mesoporous carbon spheres and reduced graphene oxide enhance the conductivity and ensure the structural integrity.

Section: Resultsmentioning

confidence: 52%

3D Graphene Networks Encapsulated with Ultrathin SnS Nanosheets@Hollow Mesoporous Carbon Spheres Nanocomposite with Pseudocapacitance‐Enhanced Lithium and Sodium Storage Kinetics

Wang

et al. 2019

Small

“…Lithium‐ion batteries (LIBs) have been the most promising energy storage devices for electric/hybrid electric vehicles and portable appliances over the past decades . However, owing to the limited lithium resources, sodium‐ion batteries (SIBs) have gained considerable attentions . Nevertheless, the larger size of Na + than Li + plagues the kinetics of Na + chemistry in the host materials .…”

Section: Introductionmentioning

confidence: 99%

“…Metal‐based anodes (Sn, Ge, Sb, etc.) have been proposed for SIBs due to their high gravimetric/volumetric capacities . Among all reported metallic anodes, antimony (Sb) processes high theoretical capacity (660 mA h g −1 ), appropriate redox potential range (0.5–0.8 V vs Na + /Na) and high electronic conductivity (2.56×10 6 S m −1 ) .…”

Section: Introductionmentioning

confidence: 99%

A Facile Carbon Quantum Dot‐Modified Reduction Approach Towards Tunable Sb@CQDs Nanoparticles for High Performance Sodium Storage

Liu

Wang

Han

et al. 2020

Batteries & Supercaps

Self Cite

Antimony (Sb) has considerable specific capacity as an anode material for sodium-ion batteries. However, the large volume expansion during alloying/dealloying with Na + leads to poor cycling stability. Herein, we report the synthesis of Sb@carbon quantum dots (Sb@CQDs) composite via a facile one-step reduction approach at room temperature. CQDs can modify the nucleation and growth of Sb particles during the reduction process and thus tune the size of Sb. Sb@CQDs particles with size of~7 nm can relieve the volume expansion and reduce the diffusion distance for sodium ions. Moreover, the residual CQDs in the obtained composite enhance the electronic conductivity. Benefited from the modification of CQDs, the Sb@CQDs composite delivers high specific capacity of 635 mA h g À 1 at 0.1 A g À 1 and 334 mA h g À 1 at 2 A g À 1 .

“…Metal sulfides such as MoS 2 , WS 2 , and SnS 2 which react with Li/Na ion via conversion or/and alloying are popular anode materials on account of the controllable morphology and high theoretical capacity. In particular SnS with the layered orthorhombic structure has a high theoretical capacity and provide plenty of channels for Li/Na ion insertion/deinsertion . Unfortunately, there are problems including the large volume change (260 % in LIBs and 420 % in SIBs) during insertion/deinsertion, low electrical conductivity, and structure re‐organization, which lead to poor cycling stability, inferior rate capability, serious agglomeration, and low materials utilization …”

Section: Introductionmentioning

confidence: 99%

“…In particular SnS with the layered orthorhombic structure has a high theoretical capacity and provide plenty of channels for Li/Na ion insertion/deinsertion. [2] Unfortunately, there are problems including the large volume change (260 % in LIBs and 420 % in SIBs) during insertion/deinsertion, low electrical conductivity, and structure re-organization, which lead to poor cycling stability, inferior rate capability, serious agglomeration, and low materials utilization. [3][4][5][6][7] There has been much research on SnS, for instance, designing nanostructures with the optimal morphology and structure and combining with stable and conductive carbon-based materials.…”

Section: Introductionmentioning

confidence: 99%

Hollow Spheres Consisting of SnS Nanosheets Conformally Coated with S‐Doped Carbon for Advanced Lithium‐/Sodium‐Ion Battery Anodes

et al. 2020

Although tin sulfide is a promising anode material for lithium‐ and sodium‐ion batteries due to the layered structure and high theoretical capacity, the large volume expansion and poor kinetics have seriously hindered further development and application. In this work, hollow spheres consisting of in situ generated SnS nanosheets (SnS@C HSs) conformally coated with S‐doped carbon are fabricated using polystyrene spheres as the self‐sacrifice template and carbon source. The SnS@C HSs with a large SnS interlayer distance, S‐doped carbon matrix, and hollow structure not only relieve the pressure caused by volume expansion during cycling, but also promote fast transfer of lithium/sodium ions leading to a high pseudocapacitance. The SnS@C HSs have excellent electrochemical properties in both LIBs and SIBs such as high capacity, high rate, and outstanding cycling stability. The use of a self‐sacrifice template is demonstrated to be a convenient and efficient strategy to design and prepare carbon‐coated metal hollow spheres for efficient energy storage and conversion.