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Verified CAS / Academic Author2 Decoded Studies

Prof. DING Shujiang

Xi'an Jiaotong University

Research Publications & English Decoded Briefs

Showing 2 publications
SCIENCE CHINA Materials•2026•DOI: 10.1007/s40843-025-3748-9

Elimination of lattice strain to reconstruct ion transport channels facilitates direct regeneration of spent LiFePO4 cathode materials

Direct regeneration is a sustainable solution for recycling spent lithium-ion batteries (LIBs), yet the irregular strains induced by the irreversible FePO4 phase after cycling hinder Li+ replenishment in spent LiFePO4 cathodes. This study proposes a lattice stress modulation strategy that reduces FePO4 to Fe2P2O7, reducing unit cell volume from 271.7 to 122.6 Å3, releasing residual stress and reconstructing continuous Li+ transport channels. The phase transformation reconstructs FeO6 octahedra, lowering the migration energy barrier for ions. This synergistically weakens steric effects, facilitating Li+ replenishment and eliminating Li-Fe anti-site defects. Regenerated LiFePO4 cathodes achieve 80.2% capacity retention after 1000 cycles at 2C, outperforming commercial cathodes. The work establishes fundamental principles for the pre-treatment stage of direct regeneration and provides a paradigm-shifting solution for sustainable LIB recycling.

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SCIENCE CHINA Materials•2025•DOI: 10.1007/s40843-025-3376-9

Uncovering Interfacial Instability: How Phase Separation in Polymer Electrolytes Undermines Battery Performance?

Solid-state batteries (SSBs) pairing lithium metal anodes with high-voltage cathodes promise higher energy density and safety than liquid-electrolyte lithium-ion batteries. Polymer electrolytes (PEs) are pivotal due to flexibility, processability, and conformal electrode contact. However, high interfacial resistance, lithium dendrite growth, inactive dead lithium, and parasitic side reactions—especially with high-voltage cathodes—severely limit PE-based SSBs. These failures stem from concentration heterogeneity (concentration polarization) and chemical heterogeneity at the electrode/PE interface during operation. Concentration gradients produce non-uniform Li-ion flux, creating localized hot spots that trigger dendrite formation and electrolyte decomposition. Chemical heterogeneity from spatially non-uniform side reactions dictates the nature and effectiveness of the solid electrolyte interphase (SEI) or cathode electrolyte interphase (CEI). Probing the evolution of these heterogeneities at buried solid/solid interfaces with chemical specificity and spatial resolution in functional cells remains a significant challenge. Lin et al. (Nat Nanotechnol, 2025, 20, 787–797) reported a molecular ionic composite (MIC) electrolyte—a rigid-rod ionic polymer (PBDT) network, an ionic liquid (Pyr14TFSI), and LiTFSI—as a model multiphase system. Using X-ray fluorescence (XRF) microscopy and X-ray absorption spectroscopy (XAS), they mapped sulfur distribution across Li|PE|NCM811 cross-sections. After 200 cycles, sulfur-depleted regions emerged near both electrodes, more severe at the Li metal side, indicating TFSI− anion depletion and local phase separation that compromises structural integrity and ionic transport. This work establishes interfacial chemomechanics as a governing factor for PE-based SSB stability.

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