A positive electrode sheet, a battery, and an electric device

By setting central and edge regions in the positive electrode of lithium manganese iron phosphate battery, controlling the peak position difference and surface resistance of the crystal plane, and using carbon materials to improve conductivity and heat dissipation, the heat accumulation problem of lithium manganese iron phosphate battery is solved, and the high-temperature cycle performance and capacity are improved.

CN122246065APending Publication Date: 2026-06-19CALB GROUP CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
CALB GROUP CO LTD
Filing Date
2026-04-03
Publication Date
2026-06-19

AI Technical Summary

⚠Technical Problem

In lithium iron phosphate batteries, manganese is unstable, leading to severe side reactions between the cathode material and the electrolyte, heat accumulation, and affecting the battery's high-temperature cycle performance and capacity.

⚗Method used

By setting a central region and an edge region in the positive electrode, the relationship between the peak position difference and the surface resistance of the XRD pattern (131) is controlled. Carbon materials such as graphene and carbon nanotubes are used to improve conductivity and heat dissipation. The amount of carbon materials added and the aspect ratio are adjusted to optimize battery performance.

🎯Benefits of technology

It improves the high-temperature cycle performance and capacity of lithium manganese iron phosphate batteries, avoids heat accumulation, and improves the structural stability and conductivity of the batteries.

✦ Generated by Eureka AI based on patent content.

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Abstract

This invention discloses a positive electrode sheet, a battery, and an electrical device. The positive electrode sheet includes an active material layer, the material of which includes lithium manganese iron phosphate and carbon materials. The active material layer includes a central region and an edge region. The central region is the region with the center of the active material layer as its geometric center and occupies 20% of the total area of ​​the active material layer. The edge region is at least a portion of the active material layer excluding the central region. The positive electrode sheet satisfies: ; where is the peak position of the (131) crystal plane in the XRD pattern of the active material layer in the central region, is the peak position of the (131) crystal plane in the XRD pattern of the active material layer in the edge region, and , both in °; d is the sheet resistance of the positive electrode sheet, in °. The positive electrode sheet provided by this invention improves both the high-temperature cycle performance and capacity of the battery by controlling the relationship between the peak position difference of the (131) crystal plane in the central region and the edge region and the sheet resistance.
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