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000894691 1001_ $$0P:(DE-HGF)0$$aBärmann, Peer$$b0
000894691 245__ $$aSolvent Co-intercalation into Few-layered Ti 3 C 2 T x MXenes in Lithium Ion Batteries Induced by Acidic or Basic Post-treatment
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000894691 520__ $$aMXenes, as an emerging class of 2D materials, display distinctive physical and chemical properties, which are highly suitable for high-power battery applications, such as lithium ion batteries (LIBs). Ti3C2Tx (Tx = O, OH, F, Cl) is one of the most investigated MXenes to this day; however, most scientific research studies only focus on the design of multilayered or monolayer MXenes. Here, we present a comprehensive study on the synthesis of few-layered Ti3C2Tx materials and their use in LIB cells, in particular for high-rate applications. The synthesized Ti3C2Tx MXenes are characterized via complementary XRD, Raman spectroscopy, XPS, EDX, SEM, TGA, and nitrogen adsorption techniques to clarify the structural and chemical changes, especially regarding the surface groups and intercalated cations/water molecules. The structural changes are correlated with respect to the acidic and basic post-treatment of Ti3C2Tx. Furthermore, the detected alterations are put into an electrochemical perspective via galvanostatic and potentiostatic investigations to study the pseudocapacitive behavior of few-layered Ti3C2Tx, exhibiting a stable capacity of 155 mAh g–1 for 1000 cycles at 5 A g–1. The acidic treatment of Ti3C2Tx synthesized via the in situ formation of HF through LiF/HCl is able to increase the initial capacity in comparison to the pristine or basic treatment. To gain further insights into the structural changes occurring during (de)lithiation, in situ XRD is applied for LIB cells in a voltage range from 0.01 to 3 V to give fundamental mechanistic insights into the structural changes occurring during the first cycles. Thereby, the increased initial capacity observed for acidic-treated MXenes can be explained by the reduced co-intercalation of solvent molecules.
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000894691 7001_ $$0P:(DE-HGF)0$$aNölle, Roman$$b1
000894691 7001_ $$0P:(DE-HGF)0$$aSiozios, Vassilios$$b2
000894691 7001_ $$0P:(DE-HGF)0$$aRuttert, Mirco$$b3
000894691 7001_ $$0P:(DE-Juel1)161591$$aGuillon, Olivier$$b4$$ufzj
000894691 7001_ $$0P:(DE-Juel1)166130$$aWinter, Martin$$b5
000894691 7001_ $$0P:(DE-Juel1)162271$$aGonzalez-Julian, Jesus$$b6
000894691 7001_ $$0P:(DE-HGF)0$$aPlacke, Tobias$$b7$$eCorresponding author
000894691 773__ $$0PERI:(DE-600)2383064-5$$a10.1021/acsnano.0c10153$$gVol. 15, no. 2, p. 3295 - 3308$$n2$$p3295 - 3308$$tACS nano$$v15$$x1936-086X$$y2021
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000894691 8564_ $$uhttps://juser.fz-juelich.de/record/894691/files/2020-12-03_Paper_MXene%20for%20LIB_Final.docx$$yPublished on 2021-02-01. Available in OpenAccess from 2022-02-01.
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