Porous Co2VO4 Nanodisk as a High-Energy and Fast-Charging Anode for Lithium-Ion Batteries

Abstract

High-energy–density lithium-ion batteries (LIBs) that can be safely fast-charged are desirable for electric vehicles. However, sub-optimal lithiation potential and low capacity of commonly used LIBs anode cause safety issues and low energy density. Here we hypothesize that a cobalt vanadate oxide, Co2VO4, can be attractive anode material for fast-charging LIBs due to its high capacity (~ 1000 mAh g−1) and safe lithiation potential (~ 0.65 V vs. Li+/Li). The Li+ diffusion coefficient of Co2VO4 is evaluated by theoretical calculation to be as high as 3.15 × 10–10 cm2 s−1, proving Co2VO4 a promising anode in fast-charging LIBs. A hexagonal porous Co2VO4 nanodisk (PCVO ND) structure is designed accordingly, featuring a high specific surface area of 74.57 m2 g−1 and numerous pores with a pore size of 14 nm. This unique structure succeeds in enhancing Li+ and electron transfer, leading to superior fast-charging performance than current commercial anodes. As a result, the PCVO ND shows a high initial reversible capacity of 911.0 mAh g−1 at 0.4 C, excellent fast-charging capacity (344.3 mAh g−1 at 10 C for 1000 cycles), outstanding long-term cycling stability (only 0.024% capacity loss per cycle at 10 C for 1000 cycles), confirming the commercial feasibility of PCVO ND in fast-charging LIBs.

Stabilizing intermediate phases via the efficient confinement effects of the SnS2-SPAN fibre composite for ultra-stable half/full sodium/potassium-ion batteries

“…(ii) Ultra-small SnS 2 nanocrystals were equably confined inside SPAN fibres, restraining the coacervation of SnS 2 nanocrystals and alleviating the absolute volume expansion synchronously. 79,80 (iii) The formation of C–Sn bonds attested that intense electronic coupling exists in SnS 2 and SPAN fibres, which facilitates fast charge transfer and also enhances the structure durability of the composite.…”

New enhancement mechanism of an ether-based electrolyte in cobalt sulfide-containing potassium-ion batteries

“…Due to their high energy density and long cycle life, Li-ion batteries (LIBs) have achieved dominance in the field of portable electronic devices and electric vehicles. [1][2][3][4] With the advent of large-scale energy systems, the high price of Li resources severely limit the further adoption of LIBs. Seeking a kind of energy storage technology with low cost and high efficiency becomes necessary.…”

Surface potential-determined performance of Ti3C2T2 (T = O, F, OH) and Zr3C2T2 (T = O, F, OH, S) MXenes as anode materials of sodium ion batteries

“…1 Lithium ion batteries (LIBs) are the main type of commercially available rechargeable battery due to their high energy density and long lifecycle. 2–4 However, lithium resources are limited and unevenly distributed. 5 In order to cope with the rapidly growing demand for energy storage, it is crucial to develop alternative energy storage systems.…”