Ping He

1 month ago | nature.com | Wujie Yang |Aoyuan Chen |Ping He |Haoshen Zhou

Lithium metal negative electrode is pivotal for advancing high-energy-density lithium batteries. Despite their promise, the inherent poor interfacial stability of electrolytes on lithium metal and the repeated reconstruction of the solid electrolyte interphase lead to continuous consumption of active Li and electrolyte, causing rapid failure of Li metal batteries under practical conditions. Here, we propose compressing the spacing between Li ions and anions to recruit more anions around Li ions, forming tighter solvation clusters, and then achieving the super-saturated electrolyte with a 16 M Li salt concentration in the solvent phase. This compressed solvation structure electrolyte demonstrates enhanced stability towards Li metal negative electrode, attaining more than 99.9% coulombic efficiency in Li||Cu cells and enabling long cycling life in lean-Li Li metal full cells. Designed with a positive electrode material proportion of 68%, our Li metal pouch cell achieves a specific energy of 510.3 Wh kg−1 (based on the total mass of the cell) and maintains stable cycling over 100 cycles. Li metal batteries face the challenges of poor reversibility and severe side reactions of Li metal negative electrode. Here, the authors propose compressing the solvation structure of Li+, achieving a Li coulombic efficiency beyond 99.9% and thereby enhancing the performance of Li metal batteries.

2 months ago | pubs.rsc.org | Wei Li |Haoshen Zhou |Ping He

A highly stable LiNO3/N-methylacetamide deep eutectic electrolyte for rechargeable Li-O2 batteries A deep eutectic electrolyte (DEE) based on LiNO₃-N-methylacetamide (NMA) was developed for Li-O₂ batteries. The strong hydrogen bonding interactions within the electrolyte enable a high LiNO₃ concentration of 3.2 M, which not only enhances the compatibility with the lithium anode but also serves as an efficient oxidation mediator.

Mar 18, 2025 | pubs.rsc.org | Hui Pan |Sixie Yang |Haoshen Zhou |Ping He

Monitoring internal stress variation of solid-state batteries by fiber Bragg grating† Fiber Bragg grating is utilized as an in situ stress sensor for two representative categories of solid-state electrodes.

Feb 18, 2025 | nature.com | Zhu Cheng |Hui Pan |Marnix Wagemaker |Ping He

AbstractRechargeable Li||I2 batteries based on liquid organic electrolytes suffer from pronounced polyiodides shuttling and safety concerns, which can be potentially tackled by the use of solid-state electrolytes. However, current all-solid-state Li||I2 batteries only demonstrate limited capacity based on a two-electron I−/I2 polyiodides chemistry at elevated temperatures, preventing them from rivaling state-of-the-art lithium-ion batteries.

Jan 16, 2025 | mdpi.com | Xinyu Zhang |Ping He |Jie Xu

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