Stabilization of selenium cathodes via in situ formation of protective solid electrolyte layer

Lee, Jung Tae; Kim, Hyea; Nitta, Naoki; Eom, KwangSup; Lee, Dong‐Chan; Wu, Feixiang; Lin, Huan-Ting; Zdyrko, Bogdan; Cho, Won Il; Yushin, Gleb

doi:10.1039/c4ta04467c

Cited by 34 publications

(15 citation statements)

References 55 publications

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“…In carbonate electrolytes, the interface generated on Se‐based cathodes has been proven to be very efficient in facilitating electrode kinetics and forbidding side reactions. [ 31,41,51,52,218 ] However, no such interface can be observed in the case of ether‐based electrolytes, which is ascribed to the high chemical stability of the ether solvent. [ 52 ] Optimizing or even constructing reliable interface between the electrode and electrolyte would be a potential pathway to achieve advanced LSeBs.…”

Section: Blocking Layer Engineeringmentioning

confidence: 99%

“…For example, Lee et al. [ 218 ] found that a protective layer was formed on the cathode in the electrolyte with FEC after an activation cycle ( Figure a), and consequently delivered a much more stable cycling performance as compared to the samples without FEC and/or activation cycle (Figure 17b). Further postmortem examination suggests that the Li anode of cycled LSeBs with FEC was quite smooth, whereas a thick insulating layer comprising deposited lithium polyselenides was noted in the cycled cells without FEC (Figure 17c,d).…”

Section: Blocking Layer Engineeringmentioning

confidence: 99%

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State‐Of‐The‐Art and Future Challenges in High Energy Lithium–Selenium Batteries

Sun

Liu

et al. 2021

Advanced Materials

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Li‐chalcogen batteries, especially the Li–S batteries (LSBs), have received paramount interests as next generation energy storage techniques because of their high theoretical energy densities. However, the associated challenges need to be overcome prior to their commercialization. Elemental selenium, another chalcogen member, would be an attractive alternative to sulfur owing to its higher electronic conductivity, comparable capacity density, and moreover, excellent compatibility with carbonate electrolytes. Unlike LSBs, the research and development of Li–Se batteries (LSeBs) have garnered burgeoning attention but are still in their infant stage, where a comprehensive yet in‐depth overview is highly imperative to guide future research. Herein, a critical review of LSeBs, in terms of the underlying mechanisms, cathode design, blocking layer engineering, and emerging solid‐state electrolytes is provided. First, the electrolyte‐dependent electrochemistry of LSeBs is discussed. Second, the advances in Se‐based cathodes are comprehensively summarized, especially highlighting the state‐of‐the‐art SexSy cathodes, and mainly focusing on their structures, compositions, and synthetic strategies. Third, the versatile separators/interlayers optimization and interface regulation are outlined, with a particular focus on the emerging solid‐state electrolytes for advanced LSeBs. Last, the remaining challenges and research orientations in this booming field are proposed, which are expected to motivate more insightful works.

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Section: Blocking Layer Engineeringmentioning

confidence: 99%

Section: Blocking Layer Engineeringmentioning

confidence: 99%

State‐Of‐The‐Art and Future Challenges in High Energy Lithium–Selenium Batteries

Sun

Liu

et al. 2021

Advanced Materials

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“…The first problem can be partially avoided by adopting porous carbon, which contains the sulfur inside nanopores based on overlapping of adsorption potentials914151617. The second problem could be largely circumvented by employing the appropriate electrolyte additive(s) to form the desirable SEI18. However, these strategies are still not satisfactory, and further improvements are required.…”

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confidence: 99%

A stable lithiated silicon–chalcogen battery via synergetic chemical coupling between silicon and selenium

et al. 2017

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Li-ion batteries dominate portable energy storage due to their exceptional power and energy characteristics. Yet, various consumer devices and electric vehicles demand higher specific energy and power with longer cycle life. Here we report a full-cell battery that contains a lithiated Si/graphene anode paired with a selenium disulfide (SeS2) cathode with high capacity and long-term stability. Selenium, which dissolves from the SeS2 cathode, was found to become a component of the anode solid electrolyte interphase (SEI), leading to a significant increase of the SEI conductivity and stability. Moreover, the replacement of lithium metal anode impedes unwanted side reactions between the dissolved intermediate products from the SeS2 cathode and lithium metal and eliminates lithium dendrite formation. As a result, the capacity retention of the lithiated silicon/graphene—SeS2 full cell is 81% after 1,500 cycles at 268 mA gSeS2−1. The achieved cathode capacity is 403 mAh gSeS2−1 (1,209 mAh cmSeS2−3).

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“…17,45,[95][96][97][98] Typically, FEC is used to enhance the cycling efficiency of Si anodes through growth of polymeric fluorine containing SEI and multiple studies focused on its chemical composition and mechanisms of inducing effective cross-linking. [99][100][101] Similar mechanisms may be expected to take place in case of conversion cathodes if their first discharge cycle potential range was similarly low.…”

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confidence: 99%

In situ surface protection for enhancing stability and performance of conversion-type cathodes

Borodin

Yushin

2017

MRS Energy & Sustainability

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Lithium and lithium-ion batteries (LBs and LIBs) are the most popular battery systems for electrochemical energy storage technologies. Commercial LIBs utilize intercalation-type cathode materials, mostly nickel (Ni)-based and cobalt (Co)-based cathodes, showing specific capacities of up to ∼200 mA h/g (theoretical capacity below 300 mA h/g), which limit the specific energy of batteries, and are additionally expensive and toxic. An EPA study showed that the Ni-and Co-containing batteries that use solvent-based electrode processing have the highest potential for negative environmental impacts. 1 These impacts include resource depletion, global warming, ecological toxicity, and human health impacts with the largest contributing processes include those associated with the production, processing, and use of cobalt and nickel metal compounds, which may cause adverse respiratory, pulmonary, and neurological effects in those exposed. 1 The study suggested cathode material substitution and solvent-less electrode processing to reduce these impacts. 1 The uneven distribution of Co in the earth crust 2 and the insufficient use of suitable personal protection equipment in many Co mining developing countries 3,4 created a major concern. For example, Amnesty International findings of major exploitations of children in Co mines and the related child sickness and deaths 3,4 demonstrate some of the most horrific examples of child labor, which international community should not tolerate and certainly should not encourage through growing market demands for Co. The growing Co contained-electronic waste ABSTRACTThe use of in situ formed protective layer on conversion cathodes was introduced as a cheap and simple strategy to shield these materials from undesirable interactions with liquid electrolytes.Conversion-type cathodes have been viewed as promising candidates to replace Ni-and Co-based intercalation-type cathodes for next-generation lithium (Li) and Li-ion batteries with higher specific energy, lower cost, and potentially longer cycle life. Typically, in conversion reactions two or three Li ions may be stored per just one atom of chalcogen (e.g., S or Se) or transition metal (e.g., Fe or Cu used in halides). Unfortunately, in conversion chemistries the active materials or intermediate charge/discharge products suffer from various unfavorable interactions and dissolution in organic electrolytes. In this mini-review article, we discuss the current interfacial challenges and focus on the protective layers in situ formed on the cathode surface to effectively shield conversion materials from undesirable interactions with liquid electrolytes. We further explore the mechanisms and current progress of forming such protective layers by using various salts, solvents, and additives together with the insight from molecular modeling. Finally, we discuss future opportunities and perspectives of in situ surface protection.Keywords: Li; S; F; coating; energy storage Review DiSCUSSiON POiNTS• Conversion-type cathodes have been viewed as promi...

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Stabilization of selenium cathodes via in situ formation of protective solid electrolyte layer

Cited by 34 publications

References 55 publications

State‐Of‐The‐Art and Future Challenges in High Energy Lithium–Selenium Batteries

State‐Of‐The‐Art and Future Challenges in High Energy Lithium–Selenium Batteries

A stable lithiated silicon–chalcogen battery via synergetic chemical coupling between silicon and selenium

In situ surface protection for enhancing stability and performance of conversion-type cathodes

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