Two dimensional transition metal VMnAlC

Appearance: black powder
CAS:
Element: V, Mn, Al, C
Purity: by X-ray result
Molecular Weight: 144.87
Apparent Density (g/cm3): ---

Storage: dry seal preservation below 50 ℃.
Do not use if cap seal is broken.
Keep out of reach of children.

Hard carbon (HC) is a promising anode material for sodium ion batteries (SIBs) and potassium ion batteries (PIBs), but the cycle performance is still not satisfactory for practical application, due to the volume change during the insertion/extraction process of Na+ or K+ . [1] Moreover, the poor flexibility of the conventional HC anodes prepared through coating method cannot satisfy the requirement of flexible devices.[2,3] Herein, we propose a very simple but powerful strategy to fabricate flexible HC electrode with excellent structure and cycle stability for SIBs and PIBs by using Ti3C2Tx MXene as a multi-functional buffer binder. By vacuum-assisted filtration of evenly dispersed solution of HC and MXene, the obtained MXene-bonded HC films are flexible, free-standing and can be directly used as anodes for SIBs and PIBs. The elimination of all the inactive components, including polymer binders, conductive additives and current collectors, makes the HC-M films show superior electrode capacity to the conventional polymer-bonded HC electrode. What’s more, in the MXene-bonded HC film, HC particles are embedded in the conductive MXene sheets. The MXene sheets construct 3D network, which can effectively stabilize the electrode structure and buffer the volume expansion of HC during the charge/discharge process, leading the excellent cycle performance. Compared with the conventional PVDF-bonded HC electrode, the MXene-bonded HC films exhibit enhanced electrode capacity and cycle stability as anodes of both SIBs and PIBs. The HC-M2:1 film can deliver a high Na-storage capacity of 368.5 mAh g-1 at 30 mA g-1 with no capacity decay after 1500 cycles. For PIBs, in which the volume expansion is more serious, the HC-M-2:1 film can show a capacity retention of 84% over 100 cycles, superior to conventional HC-PVDF electrode (36.8%). Benefiting from the 3D conductive network, the MXene-bonded HC film electrodes also present improved rate capability, indicating MXene is a very promising multi-functional buffer binder for next-generation flexible secondary rechargeable batteries.