Secondary battery and electronic device

By optimizing the position of the positive electrode tab and the composition of the positive electrode material, a uniform and continuous carbon film conductive network is formed, which solves the transport problem of lithium phosphate positive electrode material under high rate and low temperature conditions and improves the discharge performance of secondary batteries.

WO2026112849A1PCT designated stage Publication Date: 2026-06-04NINGDE AMPEREX TECHNOLOGY LTD
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Patent Information

Authority / Receiving Office
WO · WO
Patent Type
Applications
Current Assignee / Owner
NINGDE AMPEREX TECHNOLOGY LTD
Filing Date
2024-11-27
Publication Date
2026-06-04

AI Technical Summary

Technical Problem

Lithium phosphate cathode materials exhibit high electron transport resistance and low transport rate under high-rate or low-temperature conditions, leading to deterioration in discharge performance.

Method used

By setting the position of the positive electrode tab on the positive electrode sheet and adjusting the content of the first element in the positive electrode material, combined with the thickness control of the conductive carbon layer and the carbon coating layer, the cell parameters and electron transport path of the positive electrode material are optimized, forming a uniform and continuous carbon film conductive network, thereby improving the transport rate of lithium ions and electrons.

Benefits of technology

It improves the discharge performance of secondary batteries under high rate and low temperature conditions, increases the electron and lithium-ion transport rate, reduces the transport resistance, and achieves a balance between improving high rate discharge performance.

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Abstract

A secondary battery and an electronic device. The secondary battery comprises a positive electrode sheet and a positive electrode tab; the positive electrode sheet comprises a positive electrode current collector and a positive electrode material layer located on the positive electrode current collector; the distance between the positive electrode tab and a winding starting end of the positive electrode sheet is x cm, and the length of the positive electrode sheet is I cm, wherein 1 / 3≤x / I≤2 / 3; the positive electrode material layer comprises a first element; the first element is selected from one or more of a titanium element, a magnesium element, a vanadium element, a chromium element, a copper element, a zinc element, a yttrium element, a zirconium element, a niobium element, a molybdenum element, or a tungsten element; and based on the total mass of the positive electrode material layer, the mass content of the first element is y ppm, wherein 100≤y≤8,000. The technical solution can improve the high-rate discharge performance of the secondary battery and also enhance low-temperature performance.
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