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Synthesis and characterization of MXenes: a new class of 2D materials for Sodium ion batteries

pubblicazioni - Poster

Synthesis and characterization of MXenes: a new class of 2D materials for Sodium ion batteries

I MXeni, materiali lamellari 2D, sono stai studiati e testati come anodi nelle batterie a ioni Sodio. Questi materiali sono ottenuti a partire dalle MAXphase per lisciviazione chimica dell’alluminio. I materiali sono stati testati come anodi utilizzando sodio metallico come controelettrodo. La capacità massima specifica misurata è 1200mAh/g.

The development of lithium-ion batteries (LIB) will be hindered in the future by the low availability of Li. Sodium batteries (SIB) are an alternative to the LIB given the availability of Sodium and its low impact in terms of safety and the environment [1]. However, the identification of an anodic material for SIBs that guarantees the same performance as the LIBs is an open question. In this scenario, RSE investigates a new class of 2D anodic materials called MXeni [2].

Several MXenes were synthesized through a two-step process: in the first they were synthesized through Spark Plasma Sintering, the MAXphase Ti3AlC2, in the second, through a chemical reaction the Al present in the MAXphase was selectively dissolved, leading to the formation of the MXeni Ti3C2Tx (where T can be O, F, OH).The quantity of dissolved Al was monitored by ICP analysis; changing the experimental conditions it is possible to prepare different types of MXene differently exfoliated.

Electrochemical tests were performed on the synthesized Mxenes using metal sodium as a counter electrode. Cyclic voltammetry analysis was performed to define the system stability range (0.1-3V) and galvanostatic cycles with potential limitation (GCPL) to measure the charge and discharge of the electrode. The maximum specific capacity measured is 1200mAh / g, confirming that the synthesized material is very promising.

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