Composite Electrode Plate Primer Layer for Low-Resistance Bonding
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Solution Overview
Problem
Lithium-ion batteries face challenges in achieving high mass energy density and volume energy density, with improvements needed in electrode plate performance, particularly in conductivity and safety, due to the use of plastic current collectors plated with metal layers, which can lead to performance degradations in machinability, safety, and electrical performance.
Innovation Solution
An electrode plate design featuring a current collector with a support layer and a conductive layer of specific thickness, where a conductive primer layer is introduced between the current collector and the electrode active material layer to enhance bonding and conductivity, improving the composite current collector interface and reducing direct current resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If a plastic current collector plated with a metal layer is used, then mass energy density and volume energy density are improved, but machinability and safety performance deteriorate
Solution Approach 1:
The current collector is segmented into multiple functional layers: a plastic support layer providing mechanical strength and safety, and a thin metal conductive layer providing electrical conductivity. This segmentation allows each layer to perform its specialized function without the drawbacks of using a thick metal layer throughout.
Solution Approach 2:
The patent uses a composite current collector structure combining plastic and metal materials. The plastic support layer (e.g., polyolefin) provides safety and mechanical properties, while the metal conductive layer (e.g., aluminum or copper) provides electrical conductivity. This composite approach achieves high energy density while maintaining safety performance.
2Quantity of substance
If a thin conductive layer is used on the current collector, then mass energy density is improved, but electrical conductivity and bonding strength deteriorate
Solution Approach 1:
The metal conductive layer is applied locally on the plastic support layer with optimized thickness (0.1-10 μm) to provide sufficient electrical conductivity while minimizing weight. The conductive layer is positioned exactly where needed for electrical function without adding unnecessary mass elsewhere in the battery structure.
Solution Approach 2:
The patent optimizes the thickness parameter of the metal conductive layer within a specific range (0.1-10 μm) to balance electrical conductivity and mass energy density. By controlling this parameter, the system achieves adequate conductivity while maximizing energy density improvement.
3Reliability
If a metal layer is plated on the current collector, then electrical conductivity is improved, but bonding force with electrode active material deteriorates
Solution Approach 1:
The plastic support layer acts as an intermediary between the metal conductive layer and the electrode active material. It provides a surface with good bonding characteristics for the active material while the thin metal layer maintains electrical conductivity. This intermediary structure resolves the conflict between conductivity and bonding strength.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This design enhances the bonding force between the current collector and the electrode active material layer, improves electronic transmission efficiency, and reduces resistance, leading to better electrical and safety performance, and long-term reliability of the battery.
Implementation Method 1
a conductive primer layer including a conductive material and a bonding agent is further disposed between the current collector and the electrode active material layer
Data Source
AI summary
This application relates to the battery field, and specifically, to an electrode plate, an electrochemical apparatus, a battery module, a battery pack, and a device. The electrode plate in this application includes a current collector and an electrode active material layer disposed on at least one surface of 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-side thickness D2 of the conductive layer satisfies 30 nm≤D2≤3 μm, and a conductive primer layer including a conductive material and a bonding agent is further disposed between the current collector and the electrode active material layer. The electrode plate in this application has good machinability. An electrochemical apparatus including the electrode plate has high energy density, good electrical performance, and long-term reliability.