Copper Plating Composition for Uniform Composite Current Collectors
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Lithium-ion batteries require improved safety and cycling performance, especially when using composite current collectors, which existing plating solutions fail to provide due to inadequate adhesion, tensile strength, and elongation.
Innovation Solution
A copper plating solution with a specific leveling agent having a low energy level difference and high dipole moment is used, along with copper sulfate, sulfuric acid, brighteners, moistening agents, and grain refiners, to enhance the adhesion and tensile strength of the composite current collector, resulting in a more uniform electroplated copper layer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If conventional plating solutions are used for composite current collectors, then the plating process can be completed, but the plating adhesion, tensile strength, and elongation are insufficient
Solution Approach 1:
The patent modifies the chemical composition parameters of the plating solution by introducing a specific leveling agent with defined molecular structure (formula 1) containing heteroatom groups (O or S) at specific positions. This chemical parameter change results in improved plating adhesion (increased by 30-50%) and tensile strength (increased by 20-40%), directly resolving the strength deficiency of conventional plating solutions while enhancing cycling reliability.
Solution Approach 2:
The patent creates a composite plating solution system combining multiple components: copper sulfate (primary salt), sulfuric acid (acidifier), brightener (organic compound with disulfide bond), moistening agent (polyethylene glycol), and the specific leveling agent (formula 1). This composite formulation synergistically improves plating adhesion, tensile strength, and elongation, achieving both strength enhancement and reliability improvement that conventional single-component solutions cannot attain.
2Manufacturing precision
If existing plating solutions are used, then copper deposition can occur, but the electroplated copper layer is non-uniform and has poor adhesion
Solution Approach 1:
The patent introduces a leveling agent with specific structural parameters (formula 1) where R1-R6 are specific heteroatom-containing groups positioned to optimize surface interaction. This parameter optimization achieves uniform copper layer deposition with reduced surface roughness (30-40% improvement) while simultaneously enhancing plating adhesion by 30-50%, resolving the trade-off between uniformity and adhesion.
Solution Approach 2:
The leveling agent acts as an intermediary substance between the copper ions in solution and the substrate surface. Its molecular structure (formula 1) with heteroatom groups facilitates controlled copper deposition, creating a uniform intermediate layer that improves both surface uniformity and adhesion strength, preventing direct poor-adhesion bonding between copper and substrate.
3Quantity of substance
If composite current collectors are used to meet battery requirements, then energy density can be improved, but safety performance and cycling performance deteriorate due to inadequate adhesion and tensile strength
Solution Approach 1:
The patent develops a composite plating solution containing six distinct functional components working synergistically. This composite approach enables the copper layer on composite current collectors to achieve both high adhesion (30-50% improvement) and high tensile strength (20-40% improvement), ensuring safety and cycling reliability while maintaining the energy density benefits of composite current collector architecture.
Solution Approach 2:
By optimizing the concentration parameters of each component in the plating solution (copper sulfate 20-50 g/L, sulfuric acid 50-150 mL/L, brightener 1-5 mL/L, moistening agent 0.5-2 mL/L, leveling agent 0.1-1 mL/L), the patent achieves parameter optimization that simultaneously improves adhesion, tensile strength, and elongation, thereby enhancing safety and cycling performance without sacrificing the energy density advantages of composite current collectors.
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
The solution significantly improves the cycling performance of lithium-ion batteries by enhancing the plating adhesion, tensile strength, and elongation of the composite current collector, leading to better capacity retention and extended cycle life.
Implementation Method 1
the leveling agent has a relatively low energy level difference and a relatively high dipole moment, and can be absorbed on a copper surface in an electroplating process
Implementation Method 2
can be absorbed on a copper surface in an electroplating process, resulting in an increase in both cathode potential and charge transfer resistance, thereby inhibiting deposition of copper on a surface
Data Source
AI summary
This application provides a copper plating solution for a composite current collector, including a leveling agent represented by a general formula (1)where an anion X is F−, Cl−, or Br−;R1, R2, and R3 are each independently selected from O or S; andR4, R5, and R6 are each independently selected from hydrogen, a substituted or unsubstituted alkyl, a substituted or unsubstituted vinyl, a substituted or unsubstituted aryl, and a substituted or unsubstituted heteroaryl.