Cathode active materials, preparing method thereof, cathode and electrochemical devices
The use of an overlithiated layered oxide with controlled pore volumes in lithium-ion batteries addresses thermal instability and irreversibility, enhancing performance by ensuring even particle growth and improved lithium ion mobility.
KR102999315B1Active Publication Date: 2026-08-03RES & BUSINESS FOUND SUNGKYUNKWAN UNIV
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Patent Information
- Application Number
- KR1020250181067
- Authority / Receiving Office
- KR · KR
- Patent Type
- Patents
- Current Assignee / Owner
- Filing Date
- 2025-11-25
- Publication Date
- 2026-08-03
- Estimated Expiration
- 2045-03-21
AI Technical Summary
Technical Problem
Lithium cobalt composite oxides used in lithium-ion batteries face issues with thermal instability due to crystal structure degradation and oxygen gas release, leading to irreversibility and reduced performance, especially in applications like electric vehicles.
Method used
A positive electrode active material comprising an overlithiated layered oxide (OLO) with controlled macropore and micropore volumes, manufactured through a specific heat-treatment process, ensuring even growth of primary and secondary particles and improved lithium ion mobility.
Benefits of technology
Enhances structural stability, increases charging and discharging speed, and improves Coulomb efficiency of electrochemical devices by reducing irreversibility and instability caused by oxidized oxygen.
✦ Generated by Eureka AI based on patent content.
Abstract
A positive electrode active material that improves the performance of an electrochemical device is disclosed. According to one aspect, a positive electrode active material is provided that includes an overlithiated layered oxide (OLO) and has an R value of 27 or less calculated by Formula 1 below. [Equation 1] R=(PA / PB) Based on SAXS (Small-Angle X-ray Scattering): In the above Equation 1, PA is the volume (cm3 / g) of macropores contained in the cathode active material, and PB is the volume (cm3 / g) of micropores contained in the cathode active material, the macropores exhibit the highest volume fraction (cm3g-1 / Å) at a radius of 102.5Å to 103.5Å, and the micropores exhibit the highest volume fraction at a radius of 101Å to 102.5Å.
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