Flexible S/DPAN/KB Nanofiber Composite as Binder-Free Cathodes for Li-S Batteries

Kalybekkyzy, Sandugash; Mentbayeva, Almаgul; Kahraman, Memet Vezi̇r; Zhang, Yongguang; Bakenov, Zhumabay

doi:10.1149/2.0571903jes

Cited by 32 publications

(22 citation statements)

References 34 publications

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“…Figure 5a shows the CV curve of the S/DPAN/CNT cathode during lithiation/delithiation processes within a potential range of 1.00-3.00 V at a scan rate of 0.1 mV s −1 vs. Li + /Li. It is well known from the previous studies that CV curves of the S/DPAN system are different from that of the S/C composite electrodes due to an interaction of sulfur with PAN [52]. A broad reduction peak was observed at around 1.2 V vs. Li + /Li in the first CV cycle of the S/DPAN/CNT composite, which shifted to the higher potentials upon the following cycles (Figure 5a).…”

Section: Resultsmentioning

confidence: 72%

Electrospun 3D Structured Carbon Current Collector for Li/S Batteries

et al. 2020

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Light weight carbon nanofibers (CNF) fabricated by a simple electrospinning method and used as a 3D structured current collector for a sulfur cathode. Along with a light weight, this 3D current collector allowed us to accommodate a higher amount of sulfur composite, which led to a remarkable increase of the electrode capacity from 200 to 500 mAh per 1 g of the electrode including the mass of the current collector. Varying the electrospinning solution concentration enabled obtaining carbonized nanofibers of uniform structure and controllable diameter from several hundred nanometers to several micrometers. The electrochemical performance of the cathode deposited on carbonized PAN nanofibers at 800 °C was investigated. An initial specific capacity of 1620 mAh g−1 was achieved with a carbonized PAN nanofiber (cPAN) current collector. It exhibited stable cycling over 100 cycles maintaining a reversible capacity of 1104 mAh g−1 at the 100th cycle, while the same composite on the Al foil delivered only 872 mAh g−1. At the same time, 3D structured CNFs with a highly developed surface have a very low areal density of 0.85 mg cm−2 (thickness of ~25 µm), which is lower for almost ten times than the commercial Al current collector with the same thickness (7.33 mg cm−2).

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Section: Resultsmentioning

confidence: 72%

Electrospun 3D Structured Carbon Current Collector for Li/S Batteries

et al. 2020

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“…Wide-range survey XPS spectrum suggested the existence of carbon, vanadium, oxygen, and nitrogen signals in the V-CF. The fitted pattern for the C1s spectrum indicated the existence of three different profiles of carbon with binding energies of 284.6, 286.4, and 288.4 eV, corresponding to the chemical bonds of C-C [57], C-N [58], and C=O [59], respectively. For the N1s spectrum, a binding energy of 398.8 eV, corresponding to the pyridinic-type N in carbon layer [60], was found, indicating the formation of N-doped carbon structure in the V-CF.…”

Section: Resultsmentioning

confidence: 96%

2D/1D V2O5 Nanoplates Anchored Carbon Nanofibers as Efficient Separator Interlayer for Highly Stable Lithium–Sulfur Battery

Zhang

et al. 2020

Nanomaterials

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Quick capacity loss due to the polysulfide shuttle effects is a critical challenge for high-performance lithium–sulfur (Li–S) batteries. Herein, a novel 2D/1D V2O5 nanoplates anchored carbon nanofiber (V-CF) interlayer coated on standard polypropylene (PP) separator is constructed, and a stabilization mechanism derived from a quasi-confined cushion space (QCCS) that can flexibly accommodate the polysulfide utilization is demonstrated. The incorporation of the V-CF interlayer ensures stable electron and ion pathway, and significantly enhanced long-term cycling performances are obtained. A Li–S battery assembled with the V-CF membrane exhibited a high initial capacity of 1140.8 mAh·g−1 and a reversed capacitance of 1110.2 mAh·g−1 after 100 cycles at 0.2 C. A high reversible capacity of 887.2 mAh·g−1 is also maintained after 500 cycles at 1 C, reaching an ultra-low decay rate of 0.0093% per cycle. The excellent electrochemical properties, especially the long-term cycling stability, can offer a promising designer protocol for developing highly stable Li–S batteries by introducing well-designed fine architectures to the separator.

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“…The S/MCPs‐PAN nanofiber, with a suitable S loading as amorphous state inside MCPs and PAN nanofiber, showed the optimized electrochemical performance, including a great S loading, excellent reversible capacity, and outstanding rate capability. Kalybekkyzy successfully prepared a S‐PAN nanofiber‐Ketjenblack freestanding electrode for flexible Li‐S cells by electrospinning method in Figure a. Optimal conditions of electrospinning procedure were established for fabricating the S‐PAN/KB nanofiber with a great S loading.…”

Section: Cathodementioning

confidence: 99%

Section: Cathodementioning

confidence: 99%

A Review: Electrospun Nanofiber Materials for Lithium‐Sulfur Batteries

Liu

Deng

et al. 2019

Adv Funct Materials

165

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Lithium-sulfur (Li-S) batteries are in the spotlight because their outstanding theoretical specific energy is much higher than those of the commercial lithium ion (Li-ion) batteries. Li-S batteries are tough competitors for futuredeveloping energy storage in the fields of portable electronics and electric vehicles. However, the severe "shuttle effect" of the polysulfides and the serious damage of lithium dendrites are main factors blocking commercial production of Li-S batteries. Owing to their superior nanostructure, electrospun nanofiber materials commonly show some unique characteristics that can simultaneously resolve these issues. So far, various novel cathodes, separators, and interlayers of electrospun nanofiber materials which are applied to resolve these challenges are researched. This review presents the fundamental research and technological development of multifarious electrospun nanofiber materials for Li-S cells, including their processing methods, structures, morphology engineering, and electrochemical performance. Not only does the review article contain a summary of electrospun nanofiber materials in Li-S batteries but also a proposal for designing electrospun nanofiber materials for Li-S cells. These systematic discussions and proposed directions can enlighten thoughts and offer ways in the reasonable design of electrospun nanofiber materials for excellent Li-S batteries in the near future.or conducting coagulation bath) is placed against the capillary. A thin polymer fiber membrane is deposited on the collector. The electrospun nanofibers have big potential for developing the outstanding energy storage systems due to their high surface area and excellent surface-to-volume ratio which can offer numerous active sites and controllable porous structure to buffer the huge volume changes during battery cycling and infiltrate the electrolyte. [18] Electrospun nanofiber membranes possess high porosity, large specific surface area, and controllable pore size, which will block "shuttle effect" of polysulfides and enhance the wettability for electrolytes. [19] Electrospinning technique and carbonization process are facile to manufacture freestanding nanofiber fabrics with controllable porous architecture and outstanding electrical conductivity. Electrospun porous nanofibers can come into a reservoir-like matrix for the reserve of active materials. First, the hierarchical pores in electrospun porous nanofibers can improve the reactive S reaction sites and block soluble polysulfides, thereby decreasing the "shuttling effect" of polysulfides during the electrochemical cycling. Second, electrospun porous fibers have excellent physical and mechanical properties, outstanding architecture, and superior electrical conductivity, which can enhance the transfer of Li-ions and electrons, endowing extraordinary electrochemical performance of the whole battery system. [20] Figure 2 shows phase and morphological evolutions of the electrospun nanofibers. By combining the electrospinning and other treatment (thermal, chem...

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Flexible S/DPAN/KB Nanofiber Composite as Binder-Free Cathodes for Li-S Batteries

Cited by 32 publications

References 34 publications

Electrospun 3D Structured Carbon Current Collector for Li/S Batteries

Electrospun 3D Structured Carbon Current Collector for Li/S Batteries

2D/1D V2O5 Nanoplates Anchored Carbon Nanofibers as Efficient Separator Interlayer for Highly Stable Lithium–Sulfur Battery

A Review: Electrospun Nanofiber Materials for Lithium‐Sulfur Batteries

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