Interfacial Kinetics and Ionic Diffusivity of the Electrodeposited MoS₂ Film

The transition-metal disulfide (MoS2) is a fantastic material used in diverse fields of applications. Ionic diffusivity and interfacial exchange current density are model parameters that play a crucial role for the optimization of device performances, which are not clearly known for this material. The additive-free dense film of MoS2 has been deposited by a facile electrodeposition approach and characterized by structural, morphological, and compositional analyses. This report provides the characterization of interfacial charge-transfer kinetics and diffusion of lithium ion in the MoS2 films as a function of lithium concentration at 25 °C temperature. The interfacial exchange current density is observed to be varied barely, ∼0.069–0.066 mA/cm2, with the change of lithium content, from x = 0.01–0.25, in LixMoS2. The ionic diffusivity of the film is found to be in the range of ∼3 × 10–11–10–11 cm2 s–1 and does not vary much with the measured lithium concentration window. The electrochemical performances of the material are limited by the transport of lithium ion and interfacial kinetics over the measured state of lithium content. A submicron-size particle with high surface area is needed to be used as an electrode of the material for practical C-rates

Summary of main findings (n = 21 studies).

Summary of main findings (n = 21 studies).</p

Study details and results of the data extraction.

(DOCX)</p

Flow diagram of the literature search and study selection process.

Flow diagram of the literature search and study selection process.</p

PRISMA checklist.

A review protocol has been registered in the PROSPERO database (https://www.crd.york.ac.uk/prospero/display_record.php?ID=CRD42020214173). (DOCX)</p

Molecular markers analyzed only once.

(DOCX)</p

S1 File -

(PDF)</p

Search strategy.

(PDF)</p

Top markers (compounds analysed more than once).

Top markers (compounds analysed more than once).</p

Lithium-Ion Battery Power Performance Assessment for the Climb Step of an Electric Vertical Takeoff and Landing (eVTOL) Application

High power is a critical requirement of lithium-ion batteries designed to satisfy the load profiles of advanced air mobility. Here, we simulate the initial takeoff step of electric vertical takeoff and landing (eVTOL) vehicles powered by a lithium-ion battery that is subjected to an intense 15C discharge pulse at the beginning of the discharge cycle followed by a subsequent low-rate discharge. We conducted extensive electrochemical testing to assess the long-term stability of a lithium-ion battery under these high-strain conditions. The main finding is that despite the performance recovery observed at low rates, the reapplication of high rates leads to drastic cell failure. While the results highlight the eVTOL battery longevity challenge, the findings also emphasize the need for tailored battery chemistry designs for eVTOL applications to address both anode plating and cathode instability. In addition, innovative second-use strategies would be paramount upon completion of the eVTOL services