Advanced Materials最新文献

Recycling lithium iron phosphate (LFP) batteries presents critical economic and environmental challenges because of their low metal value and high energy intensity of conventional metallurgical processes. While direct recycling methods offer a pathway for lithium replenishment, they are often hindered by stringent impurity controls and complex operating conditions that limit scalability. Here, we introduce a controlled overdischarge (COD) protocol as a non-invasive strategy to rejuvenate spent LFP (S-LFP) batteries. COD selectively decomposes the solid-electrolyte interphase, releasing trapped Li⁺ and reducing Li/Fe antisite defects while simultaneously suppressing copper dissolution. The COD protocol recovers 9.56% of lost capacity and extends lifespan by over 200 cycles. Furthermore, compared to metallurgical recycling, this method markedly lowers greenhouse gas emissions to 168 g kg^-1 and energy consumption to 3 MJ kg^-1 of feedstock. These findings highlight COD as a sustainable and scalable alternative for S-LFP battery recycling.

Two-dimensional (2D) van der Waals (vdW) magnets offer a versatile platform to explore fundamental physics and low-dimensional functionalities. Metal thiophosphates (MTPs) with mobile Cu⁺ ions exhibit a ferroionic state, where polarization arises from ionic redistribution among multiple nearly degenerate sites. CuVP₂S₆ uniquely combines intrinsic ferromagnetism from the V sublattice with Cu⁺-driven ferroionic configurational freedom, enabling direct exploration of how ionic dynamics influence magnetic interactions. Herein, high-quality CuVP₂S₆ single crystals are synthesized, and their structural and physical properties are systematically investigated. Temperature-dependent neutron diffraction elucidates a ferroionic structure with dynamic distributions of copper ions across multiple crystallographic sites. The versatile occupations are driven by local symmetry-controlled orbital interactions between copper ions and surrounding ligands through a second-order Jahn-Teller mechanism. Magnetic measurements identify a ferromagnetic (FM) transition below 3.3 K. The pressure-controlled magnetocrystalline anisotropy and interlayer exchange interactions mediated by Cu⁺ migration are demonstrated, boosting the Curie temperature remarkably by over 60% and inducing a soft-to-hard FM transition unparalleled within the MTP family. These results demonstrate that ionic configurational freedom provides an efficient route to control magnetism, opening new possibilities for spintronic applications.

Sonodynamic therapy (SDT) represents a minimally invasive alternative for cancer treatment. However, its efficacy is constrained by the insufficient reactive oxygen species generation of inorganic sonosensitizers due to wide bandgaps, rapid electron-hole recombination, and insufficient oxygen adsorption/activation. Herein, we report for the first time a novel sonosensitizer constructed by anchoring Pt single-atoms onto amorphous CoMgMo-layered double hydroxide (Pt/a-LDH) for high-efficiency sonodynamic immunotherapy. Through the synergy of defect engineering and single-atom modification, Pt/a-LDH achieves sharp bandgap reduction (from 2.4 to 0.6 eV) and abundant defective environment, dramatically promoting charge separation and inhibiting electron-hole recombination (an inhibition rate of 89.8%). Moreover, the unique 2D structure and hydroxyl coordination environment of LDH yield ultrahigh single-atom loading efficiency and defect density, which significantly promote oxygen adsorption/activation, reduce reaction energy barrier (bond energy from 3.6 to 2.1 eV), and accelerate reaction kinetics. Consequently, Pt/a-LDH achieves a significant enhancement in sonodynamic performance, generating singlet oxygen at 5.3 and 38.2 times that of CoMgMo-LDH and TiO₂ sonosensitizer, respectively. In vivo assays demonstrate that polyethylene glycol-modified Pt/a-LDH induces robust immunogenic cell death, activates dendritic cell maturation, stimulates T-cell infiltration, and reprograms the immunosuppressive tumor microenvironment, offering a new paradigm for high-performance sonodynamic immunotherapy.