A full-solid lithium-selenium battery composite positive electrode material and a preparation method and application thereof

By introducing the transition metal halide silver iodide (AgI) into the all-solid-state lithium selenide battery, in-situ generation of silver nanoparticles and lithium iodide (LiI) is achieved, thus solving the problems of blocked charge transport and volume expansion at the solid-solid interface in solid-state lithium selenide batteries and realizing high electronic conductivity and long cycle stability.

CN122436481APending Publication Date: 2026-07-21ZHEJIANG BAIMA LAKE LABORATORY CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
ZHEJIANG BAIMA LAKE LABORATORY CO LTD
Filing Date
2026-06-24
Publication Date
2026-07-21

AI Technical Summary

Technical Problem

Electrochemical obstacles exist in all-solid-state lithium selenide batteries, including impeded charge transport at the solid-solid interface, mechanical stripping caused by the volume expansion of elemental selenium, and increased impedance of the interface passivation layer, which limit the rate output and long cycle life of the battery.

Method used

Silver iodide (AgI), a transition metal halide, is introduced to generate silver nanoparticles and lithium iodide (LiI) in situ under the charge-discharge voltage window. This constructs an electron conduction network and provides interfacial wettability, alleviating the volume effect and optimizing solid-solid interface dynamics.

Benefits of technology

It improves the electronic conductivity and ion migration rate of all-solid-state lithium selenide batteries, enhances the cycle stability of electrodes and the utilization rate of active materials, and improves the rate performance and long cycle life of the batteries.

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Abstract

The application relates to the technical field of solid-state batteries, and discloses a full-solid-state lithium-selenium battery composite positive electrode material and a preparation method and application thereof, wherein the composite positive electrode material comprises elemental selenium, silver iodide, conductive carbon and a sulfide solid-state electrolyte; according to the total mass percentage of the elemental selenium, the silver iodide, the conductive carbon and the sulfide solid-state electrolyte, the elemental selenium accounts for 25-35%, the conductive carbon accounts for 10-20%, the molar ratio of the elemental selenium to the silver iodide is 8-32:1, and the balance is the sulfide solid-state electrolyte; and the charge-discharge voltage window of the composite positive electrode material is 0.8-1.8 V. The elemental selenium positive electrode is modified by AgI, in-situ reaction of elemental silver nanoparticles and lithium iodide phases can be generated under the charge-discharge voltage window, the electron and ion collaborative transmission channel is greatly widened, the solid-solid interface impedance is reduced, the volume shrinkage and expansion are effectively relieved, and therefore the composite positive electrode material exhibits good rate performance and long cycle stability.
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