N-doped carbon nanotubes as cathode material in Li–S batteries

Xiao, Jiang; Wang, Hongzhe; Li, Xinyu; Wang, Zhiyong; Ma, Jiafeng; Zhao, Hang

doi:10.1007/s10854-015-3441-1

Cited by 23 publications

(13 citation statements)

References 29 publications

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“…One anodic peak and two cathodic peaks can be discerned from these CV curves. And the positions of these two cathodic are consistent with the discharge potential plateaus of discharge profiles (Xiao et al, 2015 ). Moreover, one thing we should pay attention is that in IPA/AC battery the position of cathodic peaks are higher than those of the other two batteries, while the position of anodic peak is lower, indicating that the IPA/AC coating can not only reduce the charge voltage but also make a great improvement on the discharge depth, displaying the admirable transport kinetic of ions and electrons.…”

Section: Resultssupporting

confidence: 78%

High-Performance Lithium-Sulfur Batteries With an IPA/AC Modified Separator

Guo¹,

Jiang²,

Tao³

et al. 2018

Front. Chem.

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To inhibit the polysulfide-diffusion in lithium sulfur (Li-S) batteries and improve the electrochemical properties, the commercial polypropylene (PP) was decorated by an active carbon (AC) coating with lots of electronegative oxygenic functional group of –OH. Owing to the strong adsorption of AC and the electrostatic repulsion between the –OH and negatively charged polysulfide ions, the Li-S batteries demonstrated a high initial discharge capacity of 1,656 mAh g−1 (approximately 99% utilization of sulfur) and the capacity can still remain at 830 mAh g−1 after 100 cycles at 0.2 C. Moreover, when the rate was increased to 1 C, the batteries could also possess a discharge capacity of 1,143 mAh g−1. The encouraging cycling stability make clear that this facile approach can successfully restrain the shuttle effect of polysulfides and make further progress to the practical application of Li-S batteries.

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Section: Resultssupporting

confidence: 78%

High-Performance Lithium-Sulfur Batteries With an IPA/AC Modified Separator

Guo¹,

Jiang²,

Tao³

et al. 2018

Front. Chem.

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“…To alleviate these problems and improve the electrochemical performance of Li-S batteries, researchers extensively investigated the cathodes, anodes, electrolytes, and separators of Li-S batteries. The conductivity of electrodes can be effectively enhanced by uniformly loading S on a conductive carrier [8][9][10][11], and the volume expansion of S can be effectively alleviated by designing suitable pore structures or using flexible carriers [12][13][14]. In restraining the shuttle effect of lithium polysulfide, studies can be divided into two categories.…”

Section: Introductionmentioning

confidence: 99%

“…Journal of Nanomaterials 27.12°, which originated from the skew square-type diffraction and a typical S 8 structure [9,33]. The G reflections were mainly located between 20°and 30°, indicating an amorphous state.…”

mentioning

confidence: 99%

Graphene/Sulfur@Graphene Composite Structure Material for a Lithium-Sulfur Battery Cathode

Tao

Xiao

Yang

et al. 2019

Journal of Nanomaterials

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Graphene/sulfur@graphene composite structure as a cathode material is synthesized with a facile method. Graphene can provide a more efficient conductive network for sulfur and improve the coulombic efficiency of the battery. On the other hand, it may also show the anchoring effect on sulfur, which reduces the loss of sulfur and improves the cycling performance of the battery. Due to the unique structure, the initial discharge capacity of a battery assembled with this structure could reach 1036 mAh g−1 at 0.1 C, and its reversible capacity of 619 mAh g−1 was retained after 200 cycles with a low fading rate of 0.2% per cycle. The battery could hold a discharge capacity of 501 mAh g−1 after 200 cycles at 0.5 C. Thus, the electrochemical performance improved because of the reduction of sulfur loss through polysulfide accumulation at the cathode.

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“…However, some of these materials have a poor electrical conductivity, requiring a large number of conductive additives to receive a decent rate performance . N‐doped carbon is considered a promising host material for sulfur due to the Lewis acid–base interaction between Li ions in the polysulfides and N atoms in the carbon matrix, thus contributing to effective suppression of polysulfide shuttling during charging . Additionally, nitrogen doping can increase the intrinsic electrical conductivity of carbon materials, which enhances the rate performance.…”

Section: Introductionmentioning

confidence: 99%

Dodecylamine‐Induced Synthesis of a Nitrogen‐Doped Carbon Comb for Advanced Lithium–Sulfur Battery Cathodes

Lü

Zhong

Zhou

et al. 2018

Adv Materials Inter

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cycling life, significant self-discharge, and decreased Coulombic efficiency of the batteries. [3][4][5] The second is the inherent poor electrical conductivity of the sulfur that often results in unsatisfactory rate capabilities and the poor utilization of sulfur. [6][7][8] To tackle the first issue, tremendous efforts have been made to develop a facile approach to realize the physical confinement of soluble sulfur species within the pores of nonpolar hydrophobic carbon materials, such as highly ordered mesoporous carbons, [9][10][11][12] hollow carbon spheres (HCSs), [8,[13][14][15][16] carbon papers, and graphene foams. [17,18] Typically, the physisorption capability is determined by capillary force, which is created as a result of the porous structure of the materials. [19,20] Therefore, the design of electrode architectures with unique pore structures (micro-, meso-, and macroporous) is one of the most important directions toward the development of a carbon-based host for Li-S batteries. In our previous work, the excellent confinement of polysulfides was achieved by utilizing HCSs with unique indented-void shells. [16] In our most recent work, a stable cycling performance at a high rate was also achieved by the rational design of HCSs with highly ordered mesoporous shells. [21,22] However, the performance, particularly the cycle stability, of Li-S cathodes is still insufficient based simply on physisorption because the weak adsorption capability of nonpolar hydrophobic carbon hosts for the highly polar hydrophilic Li 2 S x (4 ≤ x ≤ 8) is far from satisfactory. [23] Therefore, further improvement is still required.Anchoring the soluble Li 2 S x species via chemisorption using heteroatom-doped carbon, [24,25] graphitic carbon nitride (e.g., C 3 N 4[26-28] ), oxides (e.g., MnO 2 , [29,30] TiO 2 , [31] Ti 4 O 7 , [32] CeO 2 [33] ), nitrides (e.g., VN, [34] TiN [35] ), and sulfides (Co 9 S 8 , [36] NiS, [37] TiS 2 [38] ) have been extensively exploited and results in higher efficiency toward suppressing the sulfur loss than physical confinement. However, some of these materials have a poor electrical conductivity, requiring a large number of conductive additives to receive a decent rate performance. [28,30] N-doped carbon is considered a promising host material for sulfur due to the Lewis acid-base interaction between Li ions in the polysulfides and N atoms in the carbon matrix, thus contributing to effective suppression of polysulfide shuttling during charging. [39][40][41][42] Additionally, nitrogen doping can increase the intrinsic electrical conductivity of carbon materials, which enhances the rate performance.Host materials that can provide both a strong absorbability of soluble intermediate polysulfides and a high electronic conductivity are in high demand to realize practical applications of Li-S batteries. Here, the rational design of an N-doped carbon comb (NCC) as a new type of sulfur host for Li-S batteries, delivering a favorable performance, particularly a good cycling stability and rate capability, ...

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N-doped carbon nanotubes as cathode material in Li–S batteries

Cited by 23 publications

References 29 publications

High-Performance Lithium-Sulfur Batteries With an IPA/AC Modified Separator

High-Performance Lithium-Sulfur Batteries With an IPA/AC Modified Separator

Graphene/Sulfur@Graphene Composite Structure Material for a Lithium-Sulfur Battery Cathode

Dodecylamine‐Induced Synthesis of a Nitrogen‐Doped Carbon Comb for Advanced Lithium–Sulfur Battery Cathodes

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