Composite materials, positive electrode and battery
A carbon-sulfur composite with a protective layer of non-graphitic carbon and carbon precursors addresses conductivity and dissolution issues in lithium-sulfur batteries, enhancing discharge capacity and cycle characteristics.
TW202632756APending Publication Date: 2026-08-01NIPPON STEEL CORPORATION
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Patent Information
- Application Number
- TW114146237
- Authority / Receiving Office
- TW · TW
- Patent Type
- Applications
- Current Assignee / Owner
- Priority Date
- 2024-11-27
- Filing Date
- 2025-11-26
- Publication Date
- 2026-08-01
AI Technical Summary
Technical Problem
Lithium-sulfur batteries face issues with low conductivity of sulfur materials, leading to incomplete electrochemical reactions and the dissolution of lithium sulfide, which reduces battery capacity and cycle characteristics.
Method used
A composite material comprising a carbon-sulfur complex with a protective layer made of non-graphitic carbon and carbon precursors, having a specific film thickness and crystallite size, is used as the positive electrode active material to enhance conductivity and suppress lithium sulfide dissolution.
Benefits of technology
The composite material achieves excellent discharge capacity and cycle characteristics by allowing effective electrochemical reactions while preventing lithium sulfide dissolution, thus improving battery performance.
✦ Generated by Eureka AI based on patent content.
Abstract
The composite material of this invention comprises a carbon-sulfur composite and a protective layer formed on the surface of the carbon-sulfur composite. The carbon-sulfur composite includes a porous carbon material and a sulfur material supported on the porous carbon material. The protective layer is composed of at least one of non-graphitic carbon and a carbon precursor, with a film thickness of 0.5 nm or more and a crystallite size Lc of 4.1–8.0 nm.
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