Bipolar electrode and bipolar all-solid-state battery

By using a carbonaceous framework and nucleating agent in the bipolar electrode design, the safety and deposition efficiency issues of lithium metal anodes in all-solid-state batteries were solved, achieving efficient and dense deposition and low internal resistance, thereby improving the energy density and rate performance of the battery.

CN122291398APending Publication Date: 2026-06-26CHINA ENERGY LITHIUM
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Patent Information

Application Number
CN202411919156.X
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2024-12-24
Publication Date
2026-06-26

AI Technical Summary

Technical Problem

Lithium metal anodes in bipolar all-solid-state batteries have safety issues such as lithium dendrite formation and volume expansion. The deposition and extraction efficiency of lithium metal is low, and the contact resistance between lithium metal and the solid electrolyte is affected by external pressure, which affects battery performance.

Method used

A bipolar electrode structure containing a carbon framework and a nucleating agent is adopted. The carbon material layer improves the interfacial contact, provides storage space for lithium metal, mitigates volume changes, and achieves efficient and dense deposition of lithium metal in the bulk material layer.

Benefits of technology

It improves battery safety performance, reduces interfacial resistance, enhances lithium metal deposition and extraction efficiency, and features high rate capability and long lifespan.

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Abstract

This invention provides a bipolar electrode and a bipolar all-solid-state battery. The bipolar electrode comprises a positive electrode film, a current collector, a bulk material layer, and a carbon material layer. Through the design of the carbonaceous framework and nucleating agent in the bulk material layer, efficient and dense lithium metal deposition is achieved under high voltage conditions. The carbon material layer significantly improves the interfacial contact between the bulk material layer and the all-solid-state electrolyte, reduces interfacial resistance, and improves the deposition and extraction efficiency of lithium metal in the bulk material layer. Furthermore, the carbon material layer provides storage space for lithium metal deposited from the positive electrode, mitigating volume changes during lithium metal deposition in the bulk material layer and improving the stability of the bipolar electrode. The bipolar all-solid-state battery fabricated using the bipolar electrode exhibits high rate capability and long lifespan.
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