Durable Li_2CN_2 Solid Electrolyte Interphase Wired by Carbon Nanodomains via In Situ Interface Lithiation to Enable Long-Cycling Li Metal Batteries

Qifan Yang; Jiulin Hu; Zhenguo YaoJianjun LiuChilin Li

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Durable Li_2CN_2 Solid Electrolyte Interphase Wired by Carbon Nanodomains via In Situ Interface Lithiation to Enable Long-Cycling Li Metal Batteries

机译：Durable Li_2CN_2 Solid Electrolyte Interphase Wired by Carbon Nanodomains via In Situ Interface Lithiation to Enable Long-Cycling Li Metal Batteries

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Lithium metal batteries (LMBs) are becoming the promising candidate of highenergystorage systems. However, the fragile natural solid electrolyte interphase(SEI) cannot retard the Li dendrite growth at anode, which will causethe low coulombic efficiency (CE) of Li plating/stripping and safety hazards inLMBs. Here, an in situ construction strategy of novel artificial SEI consisting ofLi_2CN_2 ionic conductor wired by carbon nanodomains via dicyandiamide solutionreaction method on Li metal surface is proposed. This lithiophilic Li_2CN_2has the higher anti-reduction stability and longer critical length for Li dendrite,showing the excellent dendrite suppressing ability. The wired carbon domainspromote the electron connection and charge homogenization in SEI, leadingto the uniform Li nucleation around Li_2CN_2/C grains with enhanced interfacekinetics and reduced polarization. This dual conductive Li_2CN_2/C network enablesthe durable preservation of high CE and low voltage hysteresis during Liplating/stripping, endowing LiNi_(0.8)Mn_(0.1)Co_(0.1)O_2/Li cells with ultralong cyclinglife exceeding 1000 cycles at high rate. The cycling stabilization effect is alsoremarkable even under thin Li anode and high-loading cathode conditions.This study provides a solution to robust SEI configuration of high conductivityvia in situ interface lithiation reaction for high-performance LMBs.

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来源
《Advanced functional materials》 |2023年第3期|2206778.1-2206778.11|共11页
作者
Qifan Yang; Jiulin Hu; Zhenguo YaoJianjun LiuChilin Li;
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作者单位

State Key Laboratory of High Performance Ceramics andSuperfine Microstructure, Shanghai Institute of CeramicsChinese Academy of Sciences585 He Shuo Road, Shanghai 201899, China, Center of Materials Science and Optoelectronics EngineeringUniversity of Chin;

State Key Laboratory of High Performance Ceramics andSuperfine Microstructure, Shanghai Institute of CeramicsChinese Academy of Sciences585 He Shuo Road, Shanghai 201899, China, CAS Key Laboratory of Materials for Energy ConversionShanghai Institute of Ce;

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正文语种英语
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Li_2CN_2; Li dendrite suppression; Li metal batteries; solid electrolyte interphases;

Durable Li_2CN_2 Solid Electrolyte Interphase Wired by Carbon Nanodomains via In Situ Interface Lithiation to Enable Long-Cycling Li Metal Batteries

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