Electrode plate, battery monomer, battery and electric device
By setting a functional layer of lithium-rich material between the current collector layer and the active material layer of the electrode sheet, the thermal runaway problem of lithium iron phosphate batteries during overcharge is solved, and the safety and performance of the battery are improved.
Patent Information
- Application Number
- CN202411603812.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-11
- Publication Date
- 2025-03-25
AI Technical Summary
Lithium iron phosphate batteries are prone to thermal runaway when overcharged. The prior art reduces the oxidation reaction by optimizing the electrolyte, but this increases the internal resistance of the battery and affects the cycling performance.
A functional layer including a lithium-rich material is arranged between the current collector layer and the active material layer of the electrode sheet. The lithium-rich material includes a Li element, an O element and at least one transition metal element. When overcharged, this functional layer can decompose and generate gas, peel off the current collector layer and active material layer, increase the internal resistance of the battery cell, and reach the upper limit voltage of the overcharge in advance to ensure safety of overcharge.
Through the setting of the functional layer, the battery is not only safe to overcharge, but also improves the performance of the battery cell, including gram capacity, cycle stability and high-temperature storage performance.