Calcium Alginate Hydrogel Coating Comprehensively Optimizes Zn Deposition Behavior of Aqueous Zinc-Ion Batteries Anode

Industrial & Engineering Chemistry Research, Journal Year: 2024, Volume and Issue: 63(31), P. 13611 - 13622

Published: July 29, 2024

Aqueous zinc-ion batteries (AZIBs) with Zn metal as the anode have great potential for large-scale energy storage due to their unique advantages. However, anodes face unfavorable conditions such hydrogen evolution reaction (HER) and dendrite growth, which limit practical application of AZIBs. We constructed a calcium alginate (CA) hydrogel protective layer on foil surface. The carboxyl hydroxyl groups in CA can form bonds H2O inhibit HER. Meanwhile, coating also promotes desolvation process Zn(H2O)62+, results uniform dispersion Zn2+ flux. homogenize electric field distribution surface growth dendrites. Therefore, CA-Zn symmetric be stably cycled 2200 h at 0.5 mA cm–2, showing excellent cycling performance. Overall, introduction effectively optimized faced by anode.

Language: Английский

---

Electro‐Ionic‐Field Regulation through Dipole Molecule Layer toward Dendrite‐Free Zinc Anode

Advanced Functional Materials, Journal Year: 2024, Volume and Issue: unknown

Published: July 20, 2024

Abstract Zinc metal is a high‐capacity and cost‐effective anode material for aqueous zinc‐ion batteries, but its development impeded by dendrite growth interfacial side reactions. In this study, unique dipole molecule (DPM) layer constructed on zinc surface via an in situ etching‐growth strategy to regulate the electric field ion distribution. Theoretical calculations experiments confirm that asymmetrical charge distribution within DPM can significantly remodel of Zn surface. The zincophilic accelerates migration ions through ordered channels. Electro‐ionic regulation achieves dendrite‐free deposition reduces formation byproducts. DPM‐Zn symmetrical cells exhibit ultralow voltage hysteresis (≈ 24.2 mV), highly reversible plating/stripping behavior, stable cycling over 1700 h at 1 mA cm −2 . DPM‐Zn||MnO 2 full exhibited higher specific capacity cycle stability than bare anode. This work verifies feasibility electro‐ionic‐field synergistic robust anodes provides new insights into interface design anodes.

Language: Английский

---

Revealing the Nanoscopic Corrosive Degradation Mechanism of Nickel-Rich Layered Oxide Cathodes at Low State-of-Charge Levels: Corrosion Cracking and Pitting

ACS Nano, Journal Year: 2024, Volume and Issue: 18(15), P. 10566 - 10581

Published: April 1, 2024

Ni-rich layered oxides have received significant attention as promising cathode materials for Li-ion batteries due to their high reversible capacity. However, intergranular and intragranular cracks form at state-of-charge (SOC) levels exceeding 4.2 V (vs. Li/Li+), representing a prominent failure mechanism of oxides. The nanoscale crack formation SOC is attributed volume change resulting from phase transition between the H2 H3 phases. Herein, in contrast electrochemical levels, another chemical pit on directly evidenced fully lithiated (low levels). This associated with stress corrosion cracking, driven by elevated temperatures. nanoscopic behavior during aging temperatures investigated using high-resolution transmission electron microscopy, revealing that microcracks can develop through two distinct mechanisms: cycling corrosion. Notably, occur even discharged state levels), whereas are observed only levels. finding provides comprehensive understanding complex mechanisms an opportunity improve performance.

Language: Английский

---

LiF/Li₃N‐Rich Electrode–Electrolyte Interfaces Enabled by Multi‐Functional Electrolyte Additive to Achieve High‐Performance Li/LiNi_0.8Co_0.1Mn_0.1O₂ Batteries

Small, Journal Year: 2024, Volume and Issue: 20(34)

Published: April 21, 2024

Abstract LiPF 6 ‐based carbonate electrolytes have been extensively employed in commercial Li‐ion batteries, but they face numerous interfacial stability challenges while applicating high‐energy‐density lithium‐metal batteries (LMBs). Herein, this work proposes N‐succinimidyl trifluoroacetate (NST) as a multifunctional electrolyte additive to address these challenges. NST could optimize Li + solvation structure and eliminate HF/H 2 O the electrolyte, preferentially be decomposed on Ni‐rich cathode (LiNi 0.8 Co 0.1 Mn , NCM811) generate LiF/Li 3 N‐rich cathode‐electrolyte interphase (CEI) with high conductivity. The synergistic effect reduces decomposition inhibits transition metal (TM) dissolution. Meanwhile, promotes creation of solid (SEI) rich inorganics anode (LMA), which restrains growth dendrites, minimizes parasitic reactions, fosters rapid transport. As result, compared reference, Li/LiNi cell 1.0 wt.% exhibits higher capacity retention after 200 cycles at 1C (86.4% vs . 64.8%) better rate performance, even 9C. In presence NST, Li/Li symmetrical shows super‐stable cyclic performance beyond 500 h 0.5 mA cm −2 /0.5 mAh These unique features are promising solution for addressing deterioration issue high‐capacity cathodes paired LMA.

Language: Английский

---

Ion confinement effect enabled by carboxymethyl cellulose/tannic acid hybrid hydrogel electrolyte toward stable zinc anode

Chemical Engineering Journal, Journal Year: 2024, Volume and Issue: 496, P. 153865 - 153865

Published: July 9, 2024

Language: Английский

---