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- Fu, Xiangxiang, et al.
(författare)
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A 3D Framework with an In Situ Generated Li3N Solid Electrolyte Interphase for Superior Lithium Metal Batteries
- 2023
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Ingår i: Advanced Functional Materials. - : John Wiley & Sons. - 1616-301X .- 1616-3028. ; 33:51
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Tidskriftsartikel (refereegranskat)abstract
- The practical application of lithium (Li) metal for next-generation rechargeable batteries is still hampered by uncontrolled growth of Li dendrite and severe volume change under repeated plating/stripping. Introducing a 3D structure to reserve space for Li storage and inducing uniform plating/stripping by a lithophilic interface layer are effective strategies to solve these problems. Herein, a novel 3D composite Li anode (Fe-N@SSM-Li) is constructed via an in situ reaction between Li and lithiophilic Fe2N/Fe3N (Fe-N) uniformly anchored on a stainless-steel mesh (SSM). The unique lithiophilic-conductive structure of the Fe-N@SSM-Li can stabilize the Li anode by effectively inducing uniform and dense deposition and confining Li deposition inside the Fe-N@SSM-Li to alleviate volume changes. The Fe-N@SSM-Li displays a distinguished electrochemical performance, with superior lifespan of 5000, 2250, and 1350 h under 1 mA cm−2/1 mAh cm−2, 5 mA cm−2/3 mAh cm−2, and 20 mA cm−2/3 mAh cm−2 in symmetric cells, respectively. Combined with this highly stable Fe-N@SSM-Li, the full cells using LiFePO4 (LFP) and S/C cathodes both show significantly improved electrochemical performances. This work provides a low-cost and scalable strategy for the construction of high-efficiency Li anode with a novel 3D structure, offers new insights to the research of Li metal batteries and beyond.
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- Li, Liansheng, et al.
(författare)
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Optimized functional additive enabled stable cathode and anode interfaces for high-voltage all-solid-state lithium batteries with significantly improved cycling performance
- 2022
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Ingår i: Journal of Materials Chemistry A. - : Royal Society of Chemistry. - 2050-7488 .- 2050-7496. ; 10:38, s. 20331-20342
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Tidskriftsartikel (refereegranskat)abstract
- Functional additives play important roles in stabilizing the interfaces within all-solid-state lithium batteries (ASSLBs), equally vital as in liquid lithium ion batteries (LLIBs). However, they have not received as much attention as in LLIBs; especially the effects of a unique additive on both of cathode and anode interfaces are not clearly understood. Inspired by this idea, the effects of lithium difluoro(oxalate)borate (LiDFOB) and lithium bisoxalatodifluorophosphate (LiBODFP) on the stabilities of the cathode and anode interfaces within the assembled ASSLBs are systematically compared through a series of characterization techniques in this work. Owing to the different degrees of redox kinetics of the LiDFOB and LiBODFP additives, the as-formed cathode solid electrolyte interface (CEI) and anode solid electrolyte interface (SEI) films exhibit drastically different characteristics. Specifically, the LiDFOB-induced CEI film is unevenly distributed and unstable, while a uniform, thin and dense SEI film, delivering an outside-to-inside structure of organic lithium species-layer/LiF-rich layer/Li2O-rich layer, can be generated in the presence of LiDFOB. By contrast, the formed CEI film induced by the LiBODFP additive exhibits stable, uniformly distributed and thin characteristics. However, the LiBODFP-induced SEI film is flawed due to its slow reduction rate. To take full advantage of the electrochemical activities of LiBODFP and LiDFOB additives, a double-layer PEO-based composite solid electrolyte (CSE) with both additives is designed and fabricated. As a result, the assembled ASSLB with a single crystal LiNi0.6Co0.2Mn0.2 cathode and double-layer CSE shows a high specific capacity and ultra-high capacity retention (87.5% after 1340 cycles at 1C). This novel strategy of stabilizing different electrode/electrolyte interfaces using various functional additives is a promising method to enable ASSLBs with excellent performances.
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