Polypyrrole/TiO2 nanotube arrays with coaxial heterogeneous structure as sulfur hosts for lithium sulfur batteries

Zhao, Yun; Zhu, Wen; Chen, George; Cairns, Elton J.

doi:10.1016/j.jpowsour.2016.07.082

Cited by 77 publications

(43 citation statements)

References 42 publications

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“…As well known, the elemental S has the lowest viscosity at 155 °C. Thus, heating to 160 °C elemental S becomes liquid enough that it can diffuse into the host structure whereas heating to 300 °C causes vaporization of S, which also allows S to enter in the host structure . Different from the formation of the inter‐/intrachain disulfide bonds observed during vulcanization of PANI and S, there is almost no such statement between PPY and S. On the contrary, there is a dispute about the interaction between PPY and S at high temperatures.…”

Section: Applications Of Panimentioning

confidence: 99%

Application of Polyaniline for Li‐Ion Batteries, Lithium–Sulfur Batteries, and Supercapacitors

et al. 2019

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Conducting polyaniline (PANI) exhibits interesting properties, such as high conductivity, reversible convertibility between redox states, and advantageous structural feature. It therefore receives ever‐increasing attention for various applications. This Minireview evaluates recent studies on application of PANI for Li‐ion batteries (LIBs), Li–S batteries (LSBs) and supercapacitors (SCPs). The flexible PANI is crucial for cyclability, especially for buffering the volumetric changes of electrode materials, in addition to enhancing the electron/ion transport. Furthermore, PANI can be directly used as an electroactive component in electrode materials for LIBs or SCPs and can be widely applied in LSBs due to its physically and chemically strong affinity for S and polysulfides. The evaluation of studies herein reveals significant improvements of electrochemical performance by physical/chemical modification and incorporation of PANI.

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Section: Applications Of Panimentioning

confidence: 99%

Application of Polyaniline for Li‐Ion Batteries, Lithium–Sulfur Batteries, and Supercapacitors

et al. 2019

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“…[8] Among these, most strategies are still focusedo nt he construction of carbon-based electrodes. [14] Researchers thus insist on developing the potentiala dvantages of TiO 2 through av ariety of modification methods. In particular, TiO 2 serving as an additive or as ubstrate of an electrode has been investigated extensively owing to its good electrochemical/thermal stability and excellent adsorption ability for LiPSs.…”

Section: Introductionmentioning

confidence: 99%

Oxygen‐Deficient Titanium Dioxide Nanosheets as More Effective Polysulfide Reservoirs for Lithium‐Sulfur Batteries

Wang

Fan

Zheng

et al. 2017

Chemistry A European J

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In this work, oxygen-deficient anatase TiO nanosheets (A-TiO NSs) are proposed as a substrate to improve the electrochemical properties of sulfur electrodes for lithium-sulfur (Li-S) batteries. The A-TiO NSs are prepared by partly reducing pristine TiO nanosheets (A-TiO NSs) in NaBH solution. With some oxygen vacancies on the surface of the TiO nanosheets, A-TiO NSs not only promote electronic transfer, but also act as more effective polysulfide reservoirs to minimize the dissolution of lithium polysulfides (LiPSs) than the A-TiO NSs control. Hence, upon utilization as modifiers for cathodes of Li-S batteries, the A-TiO NSs-modified sulfur (A-TiO NSs-S) cathode exhibits a higher reversible specific capacity and greater cycling performance and rate capability than the A-TiO NSs-modified one (A-TiO NSs-S). For example, A-TiO NSs-S delivers an initial specific capacity of 1277.1 mAh g at 0.1 C and maintains a stable Coulombic efficiency of approximately 99.2 % after the first five cycles; these values are higher than those of 997.3 mAh g and around 96.7 %, respectively, for A-TiO NSs-S. The enhanced electrochemical properties of the A-TiO NSs-S cathode can be ascribed mainly to the more effective adsorption of dissolvable and diffused LiPSs by the oxygen vacancies. Therefore, utilization of the structure of oxygen vacancies in Li-S batteries demonstrates great prospects for practical application.

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“…Materials with ordered structures, such as core-shell, were recognized, with a sulfur content up to 60 wt%. 78,79 Conversely, other materials with an agglomerated structure where the sulfur content was lower, about 40 wt% have also been reported. The best result was for the compound S-PAN-Mg 0.6 Ni 0.…”

Section: Discussionmentioning

confidence: 99%

“…For the compound S-PPy-TiO 2 with a sulfur content greater than 60 wt%, a capacity retention of 1150 mA h g −1 after 100 cycles at 0.1 C was achieved. 78 In this case, it was not necessary to add a carbon conductive agent in the preparation of the electrode. 78 In recent years, new types of compounds such as nitrides, carbides, sulfides, and compounds with organic and organo-metallic structures have been investigated as sulfur hosts.…”

Section: Discussionmentioning

confidence: 99%

“…A better stability in the S/PPy/TiO 2 is observed with regards to TiO 2 -S cathode. 78 According to the authors this is because in the ternary composite, the generated polysulfides can be better trapped into the polymeric structure by S-C chemical bonds. The temperature effect during the heating stage in the synthesis of the ternary composite was evaluated between 160…”

Section: Sulfur-polymer-metal Oxide Composite Cathode Materialsmentioning

confidence: 99%

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Review—Non-Carbonaceous Materials as Cathodes for Lithium-Sulfur Batteries

Arias

Tesio

Flexer

2018

J. Electrochem. Soc.

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Lithium-sulfur batteries are presented as a promising alternative for the operation of those devices, including electric vehicles, that require higher specific capacity than current lithium-ion technology. Unfortunately, lithium-sulfur batteries suffer from several limitations that still produce a relatively fast capacity fading and poor utilization of active materials. In order to alleviate the disadvantages that arise at the cathode, several researchers have searched for new electrode materials. Because of the long standing tradition in the use of carbons in energy storage systems, carbonaceous cathodes have been the most popular choice. Recently, however, there has been a trend for the study of non-carbonaceous materials as cathodes in lithium-sulfur systems. Materials such as polymers, metal oxides, metal carbides, amongst many others were reported, showing excellent properties which make them compete side by side with state of the art carbonaceous cathodes. These materials have generally improved the conductivity of the conventional sulfur electrode, and have provided a 3D soft adsorbent porous structure, which efficiently traps polysulfides. These characteristics are reflected in an improved electrochemical performance, reaching, in some cases, capacity retention values close to 1000 mA h g −1 after 100 cycles at high discharge rate. Here, we propose a review of these non-carbonaceous cathodes. The specific energy of current lithium-ion secondary batteries is very close to reaching its theoretical thermodynamic limit.1 This specific energy value is limited for some technological applications, such as long autonomy range electric vehicles.2 Although no other rechargeable battery technology has shown the fantastic cyclability and stability of lithium-ion batteries, the search for new rechargeable battery technologies is a very active field of research.Lithium-sulfur (Li-S) batteries are one of several alternative systems that have been proposed for higher specific energy density rechargeable batteries. A lithium-sulfur battery consists of a lithium anode, an organic electrolyte and a sulfur composite cathode.2-5 During the discharge process, at the anode, metallic lithium is oxidized to lithium cations (Li + ), while at the cathode, and in the presence of lithium ions, elemental sulfur is reduced to lithium sulfide (Li 2 S). These batteries are presented as a promising alternative energy storage system, since they are relatively light and they have the advantage of a high theoretical energy density of 2600 Wh kg −1 , which is almost 6 times higher than that of commercial lithium-ion batteries (387 Wh kg −1 for LiCoO 2 -graphite battery). 6 In addition, sulfur has a very low cost and is largely abundant in nature. [7][8][9] The foundational stone on lithium-sulfur cells was led in 1962 by Herbert and Ulam, who proposed the use of elemental sulfur as cathode material. 10Despite their numerous theoretical advantages, lithium sulfur cells are still not commercially available due to a series of limitations. 11Sev...

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Polypyrrole/TiO2 nanotube arrays with coaxial heterogeneous structure as sulfur hosts for lithium sulfur batteries

Cited by 77 publications

References 42 publications

Application of Polyaniline for Li‐Ion Batteries, Lithium–Sulfur Batteries, and Supercapacitors

Application of Polyaniline for Li‐Ion Batteries, Lithium–Sulfur Batteries, and Supercapacitors

Oxygen‐Deficient Titanium Dioxide Nanosheets as More Effective Polysulfide Reservoirs for Lithium‐Sulfur Batteries

Review—Non-Carbonaceous Materials as Cathodes for Lithium-Sulfur Batteries

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