Positive Electrode Plate Balancing Capacity and Low DCR
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Solution Overview
Problem
Lithium-ion batteries face limitations in maintaining high-power output and long service life due to direct current resistance (DCR), which is a critical factor for new energy vehicle applications.
Innovation Solution
A positive electrode plate with controlled compaction density, surface density of the coating layer, and thickness of the current collector, formulated as 0.07<a{circumflex over ( )}3*10*β/γ<0.14, where a represents compaction density, β represents surface density, and γ represents thickness, is used to enhance the lithium-ion secondary battery's performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the coating layer thickness is increased to improve capacity, then the energy density improves, but the direct current resistance (DCR) increases and service life decreases
Solution Approach 1:
The patent applies parameter changes by precisely controlling the thickness of the aluminum foil current collector (10-25 μm) and the coating layer (5-15 μm) to optimize the balance between capacity and DCR performance. By adjusting these dimensional parameters, the patent achieves both high energy density and low direct current resistance, resolving the contradiction between capacity and reliability.
2Strength
If the current collector thickness is increased to improve structural stability, then the mechanical strength improves, but the overall battery energy density decreases
Solution Approach 1:
The patent optimizes the current collector thickness parameter to 10-25 μm, which provides sufficient mechanical strength and structural stability while minimizing the non-active material content. This parameter optimization ensures that the current collector maintains structural integrity during battery operation without excessively reducing the energy density, thus resolving the contradiction between strength and energy efficiency.
3Quantity of substance
If the coating layer density is increased to improve capacity per volume, then the volumetric energy density improves, but the manufacturing precision requirements increase
Solution Approach 1:
The patent controls the coating layer thickness within 5-15 μm and the aluminum foil thickness within 10-25 μm, achieving optimal volumetric energy density without excessive manufacturing complexity. These parameter ranges balance the need for high density with the practical constraints of manufacturing precision, allowing for consistent production quality.
Data Source
AI summary
Disclosed are a positive electrode plate, a preparation method therefore and a lithium-ion secondary battery, relating to the technical field of batteries. The positive electrode plate includes a positive electrode current collector and a positive electrode coating layer that is coated on the positive electrode current collector and contains a positive electrode active substance; the positive electrode plate satisfies 0.07<a{circumflex over ( )}3*10*β/γ<0.14, a represents the compaction density of the positive electrode coating layer, β represents the surface density of the positive electrode coating layer, and γ represents the thickness of the positive electrode current collector. While the positive electrode plate satisfies the above formula, the compaction density, the surface density and the current collector thickness of the positive electrode plate may be reasonably configured, such that it satisfies the requirements of the formula 0.07<a{circumflex over ( )}3*10*β/γ<0.14, and thus the lithium-ion secondary battery prepared by it has a long service life and excellent DCR performance.