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- 2019
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Tidskriftsartikel (refereegranskat)
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| 2. |
- Liu, Qiao, et al.
(författare)
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Enhanced ionic conductivity and interface stability of hybrid solid-state polymer electrolyte for rechargeable lithium metal batteries
- 2019
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Ingår i: Energy Storage Materials. - : Elsevier BV. - 2405-8297. ; 23, s. 105-111
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Tidskriftsartikel (refereegranskat)abstract
- Compared to conventional organic liquid electrolyte, solid-state polymer electrolytes are extensively considered as an alternative candidate for next generation high-energy batteries because of their high safety, non-leakage and electrochemical stability with the metallic lithium (Li) anode. However, solid-state polymer electrolytes generally show low ionic conductivity and high interfacial impedance to electrodes. Here we report a hybrid solid-state electrolyte, presenting an ultra-high ionic conductivity of 3.27 mS cm −1 at room temperature, a wide electrochemical stability window of 4.9 V, and non-flammability. This electrolyte consists of a polymer blend matrix (polyethylene oxide and poly (vinylidene fluoride-co-hexafluoropropylene)), Li + conductive ceramic filler (Li 1.5 Al 0.5 Ge 1.5 (PO 4 ) 3 ) and a solvate ionic liquid (LiFSI in tetra ethylene glycol dimethyl ether, 1:1 in molar ratio) as plasticizer. The introduction of the solvate ionic liquid to the solid-state electrolyte not only improves its ionic conductivity but also remarkably enhances the stability of the interface with Li anode. When applied in Li metal batteries, a Li|Li symmetric cell can operate stably over 800 h with a minimal polarization of 25 mV and a full Li|LiFePO 4 cell delivers a high specific capacity of 158 mAh g −1 after 100 cycles at room temperature.
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| 3. |
- Jiao, Xingxing, et al.
(författare)
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Crumpled Nitrogen-Doped Graphene-Wrapped Phosphorus Composite as a Promising Anode for Lithium-Ion Batteries
- 2019
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Ingår i: ACS Applied Materials & Interfaces. - : American Chemical Society (ACS). - 1944-8252 .- 1944-8244. ; 11:34, s. 30858-30864
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Tidskriftsartikel (refereegranskat)abstract
- Red phosphorus (P) has recently gained wide attention because of the high theoretical capacity of 2596 mA h/g, which has been regarded as promising anode material for lithium-ion batteries (LIBs). However, the actual application of red P in LIBs is hampered by the huge expansion of volume and low electronic conductivity. Herein, we design a kind of red phosphorus/crumpled nitrogen-doped graphene (P/CNG) nanocomposites with high capacity density and great rate performance as anode material for LIBs. This anode material was rationally fabricated through the scalable ball-milling method. The nanocomposite structure of P/CNG improves the electron conductivity and alleviates volume change of raw red P because of the three-dimension (3D) framework, massive defects and active sites of CNG sheets. As expected, the P/CNG composite shows excellent electrochemical performances, including high capacity (2522.6 mA h/g at 130 mA/g), remarkable rate capability (1340.5 mA h/g at 3900 mA/g), and great cyclability (1470.1 mA h/g at 1300 mA/g for 300 cycles). This work may provide a broad prospect for a great rate performance of P-based anode material for LIBs.
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| 6. |
- Zhang, Chaofan, et al.
(författare)
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In Situ Volume Change Studies of Lithium Metal Electrode under Different Pressure
- 2019
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Ingår i: Journal of the Electrochemical Society. - : The Electrochemical Society. - 1945-7111 .- 0013-4651. ; 166:15, s. A3675-A3678
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Tidskriftsartikel (refereegranskat)abstract
- Due to the high theoretical capacity density of 3680 mAh g(-1), lithium (Li) is considered as a promising anode for high-energy-density battery systems. However, its practical application is severely hampered by the invariable growth of Li dendrites and tremendous volume change during electrochemical plating-stripping process. Although real-time monitoring of the volume change is crucial for research and development of stable lithium anode, the studies are rare due to the lack of in-situ swelling equipment so far. Here, we report an in-situ volume change system to observe the thickness change of Li electrode at a resolution of micrometer during the electrochemical process. With a comprehensive design for this instrument, a continuously tunable pressure can be applied on the Li-Li symmetric cell to investigate the impact of pressure on the stability of Li electrode during cycling. We found that the higher pressure (similar to 850kPa) is beneficial for stabilizing Li electrode during plating/stripping process. Our results provide a perspective to investigate the electrochemical behavior of Li electrode. In addition, this instrument also shows great potential of in-situ volume change monitoring in other battery systems like silicon anode and solid-state batteries.
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