Capacity retention of lithium sulfur batteries enhanced with nano-sized TiO<sub>2</sub>-embedded polyethylene oxide

Lee, Felix; Tsai, Meng‐Che; Lin, Ming‐Hsien; Ni’mah, Yatim Lailun; Hy, Sunny; Kuo, Chao-Yen; Cheng, Ju‐Hsiang; Rick, John; Su, Wei‐Nien; Hwang, Bing‐Joe

doi:10.1039/c6ta10755a

Cited by 71 publications

(43 citation statements)

References 41 publications

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“…3,40,65 Furthermore, several studies in the field of Li/S battery research demonstrated that polysulfides can be dissolved in PEO, showing high mobility in Li/S cells with SPEs. [66][67][68] It can therefore be assumed that removal of the LSPS decomposition products, i.e., of Li-ions and polysulfides, into the polymer is a driving force for the oxidation of LSPS, following the principle of Le Chatelier.…”

Section: Discussionmentioning

confidence: 99%

Editors' Choice—Understanding Chemical Stability Issues between Different Solid Electrolytes in All-Solid-State Batteries

Riphaus

Stiaszny

Beyer

et al. 2019

J. Electrochem. Soc.

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Sulfide-based solid electrolytes (SE) are quite attractive for application in all-solid-state batteries (ASSB) due to their high ionic conductivities and low grain boundary resistance. However, limited chemical and electrochemical stability demands for protection on both cathode and anode side. One promising concept to prevent unwanted reactions and simultaneously improve interfacial contacting at the anode side consists in applying a thin polymer film as interlayer between Li metal and the SE. In the present study, we investigated the combination of polyethylene oxide (PEO) based polymer films with the sulfide-based SE Li 10 SnP 2 S 12 (LSPS). We analyzed their compatibility using both electrochemical and chemical techniques. A steady increase in the cell resistance during calendar aging indicated decomposition reactions at the interfaces. By means of X-ray photoelectron spectroscopy and further analytical methods, the formation of polysulfides, P-[S] n-P like bridged PS 4 3− units and sulfite, SO 3 2− , was demonstrated. We critically discuss potential reasons and propose a plausible mechanism for the degradation of LSPS with PEO. The main objective of this paper is to highlight the importance of understanding interfaces in ASSBs not only from an electrochemical perspective, but also from a chemical point of view.

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Section: Discussionmentioning

confidence: 99%

Editors' Choice—Understanding Chemical Stability Issues between Different Solid Electrolytes in All-Solid-State Batteries

Riphaus

Stiaszny

Beyer

et al. 2019

J. Electrochem. Soc.

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“…These oxide nanoparticles can interact with oxygen atoms in PEO chains thus reducing crystallization of PEO chains. TiO 2 nanoparticles in PEO‐bases SPEs can improve performance of Li–S cells ( Figure a) . The DFT calculations and Raman measurements revealed that the interaction between TiO 2 nanoparticles and polysulfide intermediates can alleviate the polysulfide shuttle.…”

Section: Solid‐state Electrolytesmentioning

confidence: 97%

Section: Solid‐state Electrolytesmentioning

confidence: 99%

Development and Challenges of Functional Electrolytes for High‐Performance Lithium–Sulfur Batteries

Wang

Chen

et al. 2018

Adv Funct Materials

147

110

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Lithium-sulfur (Li-S) batteries, as one of the most important candidates of next-generation batteries, are famous for high energy density, low cost, and environmental friendly benignity. However, issues originating from polysulfide shuttle of common liquid electrolytes (e.g., capacity fade, poor cycle life, and safe issue) have hindered the applications of Li-S batteries in various occasions. This review summarizes the main efforts in the electrolytes of Li-S batteries, including liquid, solid state, and hybrid electrolyte systems. The development of functional electrolytes for Li-S batteries is hopeful to alleviate the problems Li-S batteries faced today. The liquid electrolytes circumvent the polysulfide shuttle and the resultant problems by utilizing different functional solvents, lithium salts, and additives. Solid-state electrolytes as promising electrolytes are optimized to enhance the ionic conductivity at room temperature and decrease the interfacial resistance. Hybrid electrolytes that consist of two or more single electrolytes may be considered as unique categories because they have the potential advantages than the single electrolyte systems. Challenges and perspectives of Li-S electrolytes are also proposed based on the requirement for high-performance Li-S batteries.be reduced to short-chain ones, which subsequently migrate back to cathode and are reoxidized to long-chain lithium polysulfide intermediates. This endless movement and shuttle of polysulfides between cathode and anode is generally called as polysulfide shuttle. During cycling, the shuttle effect of polysulfides continuously occurs and results in lower Coulombic efficiency and anode corrosion. [3a,4,5] c) Safety issues: the electrolyte solvents may be not stable when the high reactivity of lithium metal and the soluble polysulfides are present, which results in the gradual depletion of solvents and the gas expansion of batteries. [6] High flammable organic solvents increase safety hazard, when used under high-temperature conditions. [7] Moreover, the growth of lithium dendrites can potentially penetrate the separator, which leads to internal short circuits of batteries and serious safety issues. [8] In order to overcome the issues mentioned above and improve battery performance, some strategies have been examined, including the design of sulfur cathodes, [4,9] the protection of lithium anode, [10] and the optimization of electrolytes. [11] The electrolyte between cathode and anode is a crucial component as it affects the lithium-ion transport during the cycling process, which in part determines the batteries performance. [12] Electrolyte development is time consuming because it requires high-throughput experiment but is indispensable. Some works have therefore focused on the development of functional electrolyte in the last several years. Different roads lead to the same thing that usable electrolytes should possess many characters, such as high ionic transport, low viscosity, good chemical and electrochemical stability, nonflammab...

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“…This is because the unique structure of PEO-Al 2 O 3 -based SPE allows the free transport of lithium ions and prevents the transport of polysulfide anions through the physical absorption and electrochemical deposition, which can effectively reduce the shuttle effect and the loss of active materials . Bing-joe Hwang et al also added TiO 2 to the PEObased solid electrolyte improving the performance of the battery effectively (Lee et al, 2017) (Figure 3A). The specific capacity of the polymer electrolyte with nano-sized TiO 2 is >1,450 mAh g −1 , and the capacity retention after 100 cycles is 87%.…”

Section: Li-s Batteries Based On Solid Polymer Electrolytementioning

confidence: 99%

Research Progress of the Solid State Lithium-Sulfur Batteries

Wang

Cao

et al. 2019

Front. Energy Res.

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Lithium-sulfur batteries using lithium as the anode and sulfur as the cathode can achieve a theoretical energy density (2,600 Wh.g −1) several times higher than that of Li ion batteries based on the chemical conversion reaction of 6Li + S 8 ↔ 8Li 2 S. The cost effectiveness, together with the intrinsic high energy density of the Li-S batteries, enables it to be an important option for the next generation energy storage devices. However, lithium-sulfur batteries using the liquid electrolyte would lead to the dissolution and "shuttle effect" of polysulfides, which greatly decrease the cycle life and specific capacity. In order to realize long cycle life of the lithium-sulfur battery, it is crucial to address the uncontrolled diffusion of polysulfides. Replacing the liquid electrolyte with the solid electrolyte, which can address the polysulfide dissolution and diffusion problem, inhibit the growth of lithium dendrites on the anode side, and greatly improve the safety and the cycle stability of lithium-sulfur batteries. In spite of the above merits, the performance and application of solid state Li-S batteries are strongly constrained by their low discharge capacity, poor rate performance and unsatisfied cycle life, which need to be overcome by advances in both the materials and the battery design. In this mini-review, the recent research progress of solid-state lithium-sulfur batteries in several aspects, including the sulfur-cathode design, different types of solid electrolyte and Li-S batteries based on them is described/summarized. New insights and synthesis approaches for the stable lithium anode are also summarized. We particularly emphasize the role of the interface in impeding the battery reaction, as well as the construction of the "solid/solid/solid" three-phase reaction boundary. At last, the prospects and challenges in further advancing the scientific understanding and enabling the battery technology viable are presented to shed light on the upcoming research efforts.

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Capacity retention of lithium sulfur batteries enhanced with nano-sized TiO₂-embedded polyethylene oxide

Abstract: DFT and in situ SERS revealed that the shuttle mechanism and Li anode passivation are suppressed by preferential nano-sized TiO2/polysulfide adsorption.

Cited by 71 publications

References 41 publications

Editors' Choice—Understanding Chemical Stability Issues between Different Solid Electrolytes in All-Solid-State Batteries

Editors' Choice—Understanding Chemical Stability Issues between Different Solid Electrolytes in All-Solid-State Batteries

Development and Challenges of Functional Electrolytes for High‐Performance Lithium–Sulfur Batteries

Research Progress of the Solid State Lithium-Sulfur Batteries

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Capacity retention of lithium sulfur batteries enhanced with nano-sized TiO2-embedded polyethylene oxide

Abstract: DFT and in situ SERS revealed that the shuttle mechanism and Li anode passivation are suppressed by preferential nano-sized TiO2/polysulfide adsorption.

Cited by 71 publications

References 41 publications

Editors' Choice—Understanding Chemical Stability Issues between Different Solid Electrolytes in All-Solid-State Batteries

Editors' Choice—Understanding Chemical Stability Issues between Different Solid Electrolytes in All-Solid-State Batteries

Development and Challenges of Functional Electrolytes for High‐Performance Lithium–Sulfur Batteries

Research Progress of the Solid State Lithium-Sulfur Batteries

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Product

Resources

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Capacity retention of lithium sulfur batteries enhanced with nano-sized TiO₂-embedded polyethylene oxide