石榴石基半固态电池负极Li3N@Li21Si5复合界面相的研究

doi:10.19964/j.issn.1006-4990.2025-0057

Abstract

Abstract:

Garnet type solid electrolyte has the advantages of high ionic conductivity and wide voltage window，but the biggest problem it faced is the high interfacial resistance with lithium metal anode，which restricts the development of the garnet based solid-state batteries.At present，the main improvement method is to use alloy modification layer to strengthen the interfacial contact，but easily to lead to lithium dendrite growth.In this work，different from the conventional alloy interfacial modification layers，the application of magnetron sputtered silicon nitride modification layer could greatly increase the interfacial affinity between garnet electrolyte and lithium metal，and reduce the interfacial resistance from 2 101 Ω to 181 Ω.At the same time，the electrochemical properties of pure Li₃N modified layer and Li₃N@Li₂₁Si₅ modification layers were compared.The direct current（DC） polarization of Li symmetric cells and NCM/Li hybrid solid-state batteries cycling tests showed that although Li₃N was ionic conductive，it had a high interface impedance（1 123 Ω） due to its lack of affinity for lithium.The existence of Si enhanced the lithium affinity，so the assembled Li symmetric battery lasted more than 500 h DC cycle.Using nickel cobalt manganese 622 as the cathode material，the specific capacity of the initial discharge was 188.6 mA·h/g.and the capacity retention rate of garnet based NCM/Li hybrid solid-state battery was 85.3% after 300 cycles.

Key words: hybrid solid-state battery, garnet, composited interface phase, lithium dendrite, solid electrolyte

CLC Number:

TQ131.11

ZHANG Jijun, GUO Weiyuan, DAI Xuanjun. Study on anode Li₃N@Li₂₁Si₅ composited interface phase for garnet based hybrid solid-state batteries[J]. Inorganic Chemicals Industry, 2026, 58(3): 25-31.

Figures/Tables 7

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Study on anode Li₃N@Li₂₁Si₅ composited interface phase for garnet based hybrid solid-state batteries

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Study on anode Li3N@Li21Si5 composited interface phase for garnet based hybrid solid-state batteries