Uniform distribution of zinc ions achieved by functional supramolecules for stable zinc metal anode with long cycling lifespan

Highly Reversible Zn Metal Anodes Enabled by Freestanding, Lightweight, and Zincophilic MXene/Nanoporous Oxide Heterostructure Engineered Separator for Flexible Zn-MnO2 Batteries

“…Such a structure results from uneven Zn nucleation and deposition because of the inhomogeneous electric field distribution. 26,42,55 The uneven Zn deposition further leads to the growth of Zn dendrites by the selfamplification mechanism. 56−58 At a deposition capacity of 1.0 mAh cm −2 , Zn dendrites grow into irregular and big particles.…”

A polyamino acid with zincophilic chains enabling high-performance Zn anodes

“…1e, f and Table S1 †). 9,12,[32][33][34][35][36][37][38][39][40][41][42][43] The Zn-electrode reversibility was then investigated in ZnjCu cells to explore the inhibitory effects of the electrolyte additives on hydrogen evolution and other side reactions. As displayed in Fig.…”

Stabilizing Zinc Anodes by a Cotton Towel Separator for Aqueous Zinc-Ion Batteries

“…Moreover, better lifespan retention (over 700 h) is achieved at 2 mA cm –2 in the symmetric cell with the CT separator (Figure S5a), whereas the cell with GF breaks down after 170 h. A commercial level with the areal capacity of 4 mAh cm –2 is also evaluated in the symmetric cell at 2 mA cm –2 , as shown in Figure i; the cell matched with the CT separator displays outstanding cyclic stability over 700 h. Even raising the current density to 5 or 10 mA cm –2 , it harvests superiority compared with the GF separator (Figure S5b and c). The symmetric cell with the CT separator presents favorable cycling over 600 cycles (over 140 h) at 20 mA cm –2 (Figure g), which exceeds most of the reported works for the symmetric cell (Figure k). ,,,− The reason for the voltage fluctuations may be attributed to the instability of ion fluxes at a higher current density and lower areal capacity in the precycle stage. In addition, because of the more severe issues associated with Zn powder as the anode compared to Zn foil, such as side reactions and hydrogen evolution due to more contact with the electrolyte, collapse of the structure during cycling, and rapid failure of the cell due to severe dendrite, the CT separator has a stabilizing effect on the Zn powder anode (Zn-P) which is further verified in the symmetric cell using the CT separator (Figure S6).…”

“…For AZIBs, the glass fiber (GF) separator prevails due to its good chemical stability, appropriate ionic conductivity, and favorable wettability with the electrolyte . However, the low mechanical strength of the GF separator makes the Zn dendrites with ultrahigh Young’s modulus (108 GPa) prone to penetrate the separator, hindering the superior cycle life for AZIBs. − To the best of our knowledge, although a nascent stage has been opened in GF modification (such as decoration via the graphene oxide and supramolecules) to suppress Zn dendrites, adding foreign species in the separator is likely to increase costs and reduce the energy density of the entire energy storage system. Importantly, the noneconomic price (≈¥3100 m –2 ) of the GF greatly increases the cost of AZIBs.…”