A Mixed Lithium‐Ion Conductive Li<sub>2</sub>S/Li<sub>2</sub>Se Protection Layer for Stable Lithium Metal Anode

Liu, Fanfan; Wang, Lifeng; Zhang, Zhiwen; Shi, Pengcheng; Feng, Yuezhan; Yao, Yu; Ye, Shufen; Wang, Haiyun; Wu, Xiaojun; Yu, Yan

doi:10.1002/adfm.202001607

Cited by 187 publications

(137 citation statements)

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“…These characterizations confirmed that the composition of the layer could be Li 2 Se 2 /Li 2 Se, which could enhance the cycling performance of the Li–Se batteries. This result is consistent with the previously reported literature 58 . Furthermore, EIS spectra were recorded at open-circuit voltage before cycling and after 1st cycle, 2nd cycle, 5th cycle, 10th cycle and 50th cycle at 0.1 C (Supplementary Fig.…”

Section: Resultssupporting

confidence: 94%

High-power lithium–selenium batteries enabled by atomic cobalt electrocatalyst in hollow carbon cathode

et al. 2020

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Selenium cathodes have attracted considerable attention due to high electronic conductivity and volumetric capacity comparable to sulphur cathodes. However, practical development of lithium-selenium batteries has been hindered by the low selenium reaction activity with lithium, high volume changes and rapid capacity fading caused by the shuttle effect of polyselenides. Recently, single atom catalysts have attracted extensive interests in electrochemical energy conversion and storage because of unique electronic and structural properties, maximum atom-utilization efficiency, and outstanding catalytic performances. In this work, we developed a facile route to synthesize cobalt single atoms/nitrogen-doped hollow porous carbon (CoSA-HC). The cobalt single atoms can activate selenium reactivity and immobilize selenium and polyselenides. The as-prepared selenium-carbon (Se@CoSA-HC) cathodes deliver a high discharge capacity, a superior rate capability, and excellent cycling stability with a Coulombic efficiency of ~100%. This work could open an avenue for achieving long cycle life and high-power lithium-selenium batteries.

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Section: Resultssupporting

confidence: 94%

High-power lithium–selenium batteries enabled by atomic cobalt electrocatalyst in hollow carbon cathode

et al. 2020

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“…Additionally, the Li 2 Se-rich SEI film offers high mechanical and chemical stability, preventing Li dendrite growth. [40] The surface SEM images in Figure 3a,b demonstrate that CoSe@C is uniformly covered with a thin layer of Li after plating 2 mA h cm −2 Li. The cross-sectional SEM image Figure 1.…”

Section: Resultsmentioning

confidence: 97%

3D CoSe@C Aerogel as a Host for Dendrite‐Free Lithium‐Metal Anode and Efficient Sulfur Cathode in Li–S Full Cells

Manthiram

2020

Advanced Energy Materials

162

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have been explored to mitigate the LiPS shuttling. [15-17] However, most of the polar hosts with poor conductivity compromise the electron transport, which is undesirable for efficient LiPS conversion. [18,19] Therefore, it is urgent to explore advanced polar hosts with high conductivity and efficient catalytic activity for the polysulfide redox. Beyond sulfur cathodes, the issues of Limetal anode, especially dendritic lithium growth that causes safety hazards, need to be urgently addressed. Typically, Li foils with high negative to positive electrode capacity ratio (N/P) of over 50 are used. It is pertinent to have an N/P ratio much less than 10 for practical relevance. However, metallic Li loses its mechanical integrity at low thickness owing to its softness. These issues lead to a drastic reduction in Coulombic efficiency and subsequent fast termination of battery life. Over the past decade, various strategies have been developed to tackle the issue of lithium instability. For instance, employing functional additives, such as LiNO 3 and LiF, can strengthen the solid-electrolyte interphase (SEI) and suppress Li dendrite growth. However, this approach does not address the problem of infinite volume changes associated with Li metal during Li plating/stripping. [20-23] Porous and conductive substrates, such as 3D Cu foam and Ni foam, are employed to simultaneously mitigate the uncontrollable dendritic Li growth and minimize volume variation during continuous plating/ stripping. [24-26] However, the high mass densities of these metal hosts dramatically decrease the energy and power density of the anode. In this regard, it is highly desirable to explore lightweight, porous, and lithiophilic host materials for Li metal. Various lightweight porous carbonaceous materials, including graphene and carbon nanofibers, have shown great potential for energy storage applications. [27-29] Their appealing properties, such as high electrical conductivity, low mass density, and rich porosity, suggest that carbonaceous materials can be promising hosts for Li metal. [30] However, owing to the lithiophobic property of carbonaceous materials, Li metal cannot uniformly deposit on carbon frameworks. [31] Recently, several lithiophilic materials including, ZnO, Co 3 O 4 , and VN have been decorated onto carbonaceous scaffolds to ensure homogeneous growth/nucleation of Li metal. [31-33] Motivated by these findings, a rational design of 3D lithiophilic hosts is essential for developing stable Li-metal anodes. Transition-metal selenides with high electrical conductivity and polar character have drawn extensive research interest for Lithium-sulfur batteries are appealing due to their high energy density and low cost. However, their commercial viability is challenged by uncontrollable dendritic Li growth and severe polysulfide shuttling during cycling. Here, a 3D framework coupling lithiophilic and catalytic CoSe nanoparticles with conductive carbon nanowires (CoSe@C) as an efficient host both for lithium and sulfur is reported. As a cathode ...

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“…[ 135 ] As most of the Li–S studies involved use of an excessive amount of Li on the anode side, the chemical incompatibility between Li anode and liquid electrolyte that are rarely discussed yet are equally important. Various strategies, such as high‐salt‐concentration electrolytes [ 136 ] and artificial SEI layer, [ 137 ] are expected to manipulate the electrolyte chemistry and stabilize the anode–electrolyte interface. In addition to the anode compatibility, the use of flammable liquid electrolytes may also involve safety concerns and leakage hazards.…”

Section: Conclusion and Prospectivementioning

confidence: 99%

Solidifying Cathode–Electrolyte Interface for Lithium–Sulfur Batteries

Wang

Zhang

Chou

et al. 2020

Advanced Energy Materials

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Lithium–sulfur (Li–S) batteries, with their distinct advantages in energy output, cost, and environmental benignancy, have been recognized as one of the most promising candidates for near‐future energy storage markets. However, the energy storage technology based on Li–S systems, even at the single cell level, is far from commercialization. The implementation of the technology is hindered by unstable electrochemistry at the electrode–electrolyte interface, especially the cathode–electrolyte interface. In cases where the cathode builds a solid–liquid interface with the electrolyte, strong interactions between discharge intermediates of S and solvent molecules of the liquid electrolyte lead to continuous loss of active S species from the cathode to the anode through an electrochemical shuttle process, and hampers the cycling performance of the battery. By solidifying the cathode–liquid interface, the polysulfide–solvent interaction is expected to be alleviated and the Li–S electrochemistry improved. In this Progress Report, the strategies to build a solidified cathode–electrolyte interface in liquid, quasi‐solid‐state and all‐solid‐state Li–S systems are summarized, and the fundamentals of charge transfer and chemical evolutions at the interface are discussed. With these discussions, the rational interfacial design of Li–S batteries is elucidated, toward optimal storage performance and operational durability.

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A Mixed Lithium‐Ion Conductive Li₂S/Li₂Se Protection Layer for Stable Lithium Metal Anode

Cited by 187 publications

References 50 publications

High-power lithium–selenium batteries enabled by atomic cobalt electrocatalyst in hollow carbon cathode

High-power lithium–selenium batteries enabled by atomic cobalt electrocatalyst in hollow carbon cathode

3D CoSe@C Aerogel as a Host for Dendrite‐Free Lithium‐Metal Anode and Efficient Sulfur Cathode in Li–S Full Cells

Solidifying Cathode–Electrolyte Interface for Lithium–Sulfur Batteries

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A Mixed Lithium‐Ion Conductive Li2S/Li2Se Protection Layer for Stable Lithium Metal Anode

Cited by 187 publications

References 50 publications

High-power lithium–selenium batteries enabled by atomic cobalt electrocatalyst in hollow carbon cathode

High-power lithium–selenium batteries enabled by atomic cobalt electrocatalyst in hollow carbon cathode

3D CoSe@C Aerogel as a Host for Dendrite‐Free Lithium‐Metal Anode and Efficient Sulfur Cathode in Li–S Full Cells

Solidifying Cathode–Electrolyte Interface for Lithium–Sulfur Batteries

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A Mixed Lithium‐Ion Conductive Li₂S/Li₂Se Protection Layer for Stable Lithium Metal Anode