CNT enhanced sulfur composite cathode material for high rate lithium battery

Wei, Wei; Wang, Jiulin; Zhou, Long-Jie; Yang, Jun; Schümann, B.; Nuli, Yanna

doi:10.1016/j.elecom.2011.02.001

Cited by 170 publications

(88 citation statements)

References 21 publications

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“…From this experiment it can be concluded that it is of central importance to confirm any good rate-capability performance by long-term cycling experiments, which is rarely done. 9,13,15,19,20,22,[31][32][33][34][35][36][37][38][39][40][41][42] Effect of discharge rate.-For studying the effect of dischargerate variation, the charge rate was kept at the intermediate rate of C/5, to minimize the overpotential without significantly decreasing coulombic efficiency. In a first phase, the discharge rates were increased every three cycles from lowest (C/100) to highest (3C) rate, to ensure complete lithiation during the first cycles.…”

Section: Resultsmentioning

confidence: 99%

“…This may partially be due to the significantly different discharge cutoff voltages used, and highlights the fact that the conditions used for the rate-capability tests have a significant impact on their results and should be unified to enable tracking the advances in Li-S-cell development. For example, some authors vary only the discharge rate, [13][14][15][16] whereas in most other cases, both charge and discharge rates are varied. Also, not always is the number of cycles at each rate specified, 10,[17][18][19][20] nor is it always constant.…”

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confidence: 99%

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Pitfalls in Li–S Rate-Capability Evaluation

Schott

Novák

Trabesinger

2016

J. Electrochem. Soc.

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Rate-capability tests are widely used to highlight advances in Li-S-system development. Here we show, by studying the individual effects of a number of cycling-and electrolyte-related parameters on a simple Li-S cell, that the rate-capability results are sensitive not only to the applied current but also to the cycling prehistory of the cell. On the one hand, the performance is affected by the order in which cycling rate is changed. Slow initial rates aggravate material loss and reduce the achievable capacity. On the other hand, the results of rate-capability tests are significantly different when the rates are varied only on the charge or only on the discharge. The charge rate does not directly affect the measured capacity, whereas the discharge rate does, especially when discharge cutoff voltages are high, due to slow discharge reactions. High charge rates, however, do affect the long-term stability, which is difficult to predict from usual rate-capability tests. Our findings also provide insights into the relative reaction rates and the influence of the general cycling procedures, underlining the importance of understanding the kinetics of Li-S systems, while designing them for high performance batteries. The lithium-sulfur (Li-S) battery is one of the most promising electrochemical systems for next-generation energy-storage applications, given the abundance of sulfur, its low toxicity, and its high theoretical specific charge of 1672 mAh g sulfur -1 (often referred as well as capacity). However, the commercialization of Li-S cells is hindered by substantial challenges, including the insulating nature of sulfur and of its discharge product Li 2 S, preventing efficient activematerial utilization, and the so-called polysulfide shuttle, leading to a loss of active material and low coulombic efficiency. Considerable improvements on the electrode and cell levels were made over the past few years, alleviating these limitations and, in turn, leading to an exponentially growing interest in Li-S batteries.1-5 From the perspective of every-day battery use, having a high rate capability is very important, and therefore rate-capability tests, in which the capacity is measured while changing the cycling rate (i.e., while changing the applied current), are often employed to complete the characterization of a battery. These tests are also widely used in the characterization of Li-S systems, to quantify the improvements brought about by various enhancements to the Li-S electrodes, electrolytes, their additives, and cells. Although it is known that Li-S cells, due to their complex chemistry, are sensitive to a wide range of parameters, 6-8 the protocols used in rate-capability tests described in the literature vary significantly. A comparison of rate performances reported in publications for Li-S cells using commercially available materials 9-12 is plotted in Figure 1. Despite their similar electrode composition (∼60 wt% sulfur, ∼30 wt% carbon black, ∼10 wt% binder (PEO or PVDF)), they display significantly different rate per...

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Section: Resultsmentioning

confidence: 99%

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confidence: 99%

Pitfalls in Li–S Rate-Capability Evaluation

Schott

Novák

Trabesinger

2016

J. Electrochem. Soc.

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“…또한 리튬 이온 전지의 고용량화 및 전동공구, 전기자 동차 등 대용량 고출력 분야로의 응용이 지속적으로 확대됨 [1][2][3][4][5] 에 따라 폭발, 발화와 같은 전지 안전성에 대 한 중요성이 크게 대두되고 있다.…”

Section: 서 론unclassified

The Study on Prediction of Oxidative Decomposition Potential by Comparison between Simulation and Electrochemical Methods to Develop the Binder for High-voltage Lithium-ion Batteries

Yu¹,

Kashaev²,

Lee³

2013

Journal of the Korean Electrochemical Society

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: As the development of available binder in the harsh conditions is needed, we propose the proper binder for high-voltage lithium-ion secondary batteries based on the quantum chemistry modeling. The optimized structures, HOMO (Highest Occupied Molecular Orbital) energies and ionization potentials of 4 binders, which were considered from monomer to tetramer, were investigated by the semi-empirical and DFT (Density Functional Theory) calculations. The results show that the ionization potential values by calculation tend to be close to the oxidation potentials from the measurement of linear sweep voltametry (LSV). The order of oxidative resistance from high value to low value is following: poly(hexafluropropylene), poly(vinylidene fluoride), poly(methyl acrylate) and poly(acryl amide). Also these results correspond with the experimental values. Thus, we find the reason why HOMO (Highest Occupied Molecular Orbital) energy of PHFP has the highest value than other binders by analysis of HOMO orbital structures.

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“…To solve this problem, further study [29] was done by using the carbon nanotubes (MWCNTs) to set up a highly conductive network in the composite, PAN/sulfur cathode. It was found that MWCNTs not only kept the cathode integrity and accommodated the volume change during charge/discharge processes, but also provided stable channels for electrical and ionic conduction at high power rates.…”

Section: New Preparation Methods On Cathode and Modification On Polysmentioning

confidence: 99%

Development in Lithium/Sulfur Secondary Batteries

Zhang¹,

Zhao²,

Sun³

et al. 2011

TOMSJ

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This paper reviews different modification methods to cathode, anode and electrolyte materials in view of their electrochemical properties for application in lithium/sulfur batteries. In the sulfur electrode, carbonaceous materials, conductive polymer materials, and metal oxide adsorbing materials are employed to enhance conductivity and reduce polysulfide dissolution. The effects of anodes and novel electrolytes, such as gel polymer, solid polymer and solid ceramic electrolytes, are reviewed.

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CNT enhanced sulfur composite cathode material for high rate lithium battery

Cited by 170 publications

References 21 publications

Pitfalls in Li–S Rate-Capability Evaluation

Pitfalls in Li–S Rate-Capability Evaluation

The Study on Prediction of Oxidative Decomposition Potential by Comparison between Simulation and Electrochemical Methods to Develop the Binder for High-voltage Lithium-ion Batteries

Development in Lithium/Sulfur Secondary Batteries

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