Composite Electrode Plate Structure for High-Energy Li-Ion Collectors
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Solution Overview
Problem
Existing lithium-ion batteries face challenges in achieving high weight and volumetric energy density while maintaining good electrochemical performance and safety, particularly due to issues with current collector materials and processing techniques.
Innovation Solution
The development of an electrode plate with a composite current collector featuring a thin conductive layer and a polymer-based support layer, along with a specialized electrode active material layer design and a conductive primer coating layer to enhance mechanical strength and electrochemical performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If a plastic current collector coated with a metal layer is used, then energy density is increased, but processing performance and electrochemical performance deteriorate
Solution Approach 1:
The patent uses a composite current collector structure consisting of a polymer substrate layer and a metal conductive layer. The polymer substrate provides mechanical strength and stability, while the thin metal layer provides conductivity. This composite structure achieves both high energy density (through lightweight polymer base) and good electrochemical performance (through adequate metal conductivity layer), resolving the contradiction between energy density improvement and performance deterioration.
Solution Approach 2:
The patent optimizes the thickness of the metal conductive layer on the plastic current collector. By controlling the metal layer thickness to be in a specific range (not too thin to lose conductivity, not too thick to add unnecessary weight), the patent achieves both high energy density and maintained electrochemical performance, resolving the contradiction through parameter optimization.
2Use of energy by moving object
If the conductive layer is made thinner to reduce weight, then energy density improves, but the layer becomes more prone to damage
Solution Approach 1:
The patent creates a composite structure where a thin metal conductive layer is deposited on a polymer substrate. The polymer substrate acts as a strong, lightweight base that supports the thin metal layer, preventing it from being too fragile. This allows the metal layer to be thin enough for high energy density while the polymer provides the mechanical strength and damage resistance that the thin metal layer would otherwise lack.
Solution Approach 2:
The polymer substrate serves as an intermediary between the thin metal conductive layer and the electrode active material. It provides mechanical support and protection to the thin metal layer, preventing direct damage while allowing electrical conductivity to function. This intermediary structure enables the use of thinner metal layers without sacrificing durability.
3Use of energy by moving object
If a polymer-based current collector is used, then weight is reduced and energy density increases, but short-circuit resistance decreases
Solution Approach 1:
The patent uses a composite structure with a polymer substrate and a metal conductive layer. The polymer substrate reduces weight for high energy density, while the metal conductive layer provides electrical conductivity and acts as a barrier to prevent short circuits. The combination allows the current collector to be lightweight while maintaining adequate short-circuit resistance through the metal layer's properties.
Data Source
AI summary
This application relates to an electrode plate, an electrochemical apparatus, and an apparatus thereof. The electrode plate in this application comprises a current collector, an electrode active material layer disposed on at least one surface of the current collector, and an electrical connection member electrically connected to the current collector, where the current collector includes a support layer and a conductive layer disposed on at least one surface of the support layer, a single-sided thickness D2 of the conductive layer satisfies: 30 nm≤D2≤3 μm, and the support layer is a polymer material layer or a polymer composite material layer; and the electrode active material layer includes an electrode active material, a binder, and a conductive agent, and viewed in a width direction of a coated surface of the electrode plate, the electrode active material layer includes 2n+1 zones based on compacted density.