Composite Electrode Plate Interface for High-Energy Battery Machinability
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Lithium-ion batteries face challenges in achieving high mass energy density and volume energy density, with plastic current collectors plated with metal layers improving energy density but degrading performance in machinability, safety, and electrical performance.
Innovation Solution
An electrode plate with a composite current collector having a support layer and a conductive layer, where the conductive primer layer with a water-based bonding agent is used to enhance the interface between the current collector and the electrode active material layer, improving bonding force and conductivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If a plastic current collector plated with a metal layer is used, then energy density is increased, but machinability deteriorates
Solution Approach 1:
The patent employs a composite current collector structure consisting of a plastic substrate layer plated with a metal layer (30 nm ≤ thickness ≤ 3 μm). This composite structure combines the lightweight advantage of plastic with the conductivity and machinability of metal, resolving the contradiction between energy density improvement and machinability degradation.
2Quantity of substance
If a plastic current collector plated with a metal layer is used, then energy density is increased, but safety performance deteriorates
Solution Approach 1:
The composite structure of plastic substrate with metal plating creates a synergistic effect where the plastic provides safety benefits (flexibility, thermal stability) while the metal enhances conductivity. This composite approach allows energy density improvement without compromising safety performance.
3Quantity of substance
If a plastic current collector plated with a metal layer is used, then energy density is increased, but electrical performance deteriorates
Solution Approach 1:
The patent optimizes the metal layer thickness parameter (30 nm ≤ thickness ≤ 3 μm) to achieve the right balance between conductivity and energy density. This parameter optimization ensures sufficient electrical performance while maintaining high energy density benefits.
Solution Approach 2:
The composite current collector combines plastic and metal materials to achieve both high energy density and good electrical performance, as the metal layer provides necessary conductivity while the plastic substrate contributes to energy density improvement.
4Quantity of substance
If the conductive layer thickness is reduced to increase energy density, then mass energy density is improved, but conductivity deteriorates
Solution Approach 1:
The patent establishes an optimal thickness range for the conductive metal layer (30 nm ≤ thickness ≤ 3 μm). This parameter optimization ensures that the conductive layer is thin enough to improve mass energy density but thick enough to maintain adequate conductivity and electrical performance.
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 configuration reduces direct current resistance, enhances power performance, and ensures long-term reliability by preventing polarization and lithium precipitation, while maintaining balanced electrical and safety performance.
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, and the bonding agent in the conductive primer layer includes a water-based bonding agent
Implementation Method 2
the current collector includes a support layer and a conductive layer disposed on at least one surface of the support layer... a conductive primer layer including a conductive material... is further disposed between the current collector and the electrode active material layer
Data Source
AI summary
This application relates to an electrode plate that includes a current collector and an electrode active material layer disposed on at least one surface of the current collector. 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, 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 bonding agent in the conductive primer layer includes a water-based bonding agent. 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.