Conductive Adhesive Network for High-Conductivity Silicon Li-Ion Batteries
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current lithium-ion battery technologies face challenges with conductive agents that have poor dispersion and low conductivity, leading to reduced energy density and increased costs due to the use of metal powders, which also compromise battery performance.
Innovation Solution
A conductive adhesive composed of conductive spherical node substances, conductive fiber transition substances, and tubular conductive substances, combined with a specific preparation method involving multiple mixing and debubbling steps, to enhance dispersity and conductivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If metal powder content is increased to improve conductivity, then conductivity increases, but cost increases significantly and energy density decreases
Solution Approach 1:
The patent uses a composite conductive agent system comprising carbon black particles (spherical nodes), carbon fiber (transitional bridges), and carbon nanotubes (conductive channels), forming a three-dimensional network structure. This composite approach achieves high conductivity without relying on metal powders, thereby maintaining energy density while improving conductivity
Solution Approach 2:
The conductive agent is designed with heterogeneous local structures: carbon black provides dispersion and nucleation sites, carbon fiber provides structural framework and transitional conduction paths, and carbon nanotubes provide high-conductivity channels. Each component has optimized local properties that collectively achieve high overall conductivity without increasing metal content
2Reliability
If conductive agent particles are reduced to increase conductivity, then conductivity improves, but dispersion performance deteriorates and processing complexity increases
Solution Approach 1:
The multi-component composite conductive agent (carbon black + carbon fiber + carbon nanotube) creates synergistic effects where larger carbon fiber and nanotube structures provide conductive pathways while carbon black particles fill gaps and improve dispersion. This composite structure achieves high conductivity without requiring ultra-fine particle sizes, simplifying the dispersion process
Solution Approach 2:
The conductive agent transitions from traditional zero-dimensional particles to a three-dimensional network structure comprising spherical nodes (carbon black), linear bridges (carbon fiber), and tubular channels (carbon nanotubes). This dimensional evolution improves conductivity through network formation while the hierarchical structure facilitates easier dispersion compared to uniform nanoscale particles
3Reliability
If conductive agent content is increased beyond optimal level to maintain conductivity, then conductivity is maintained, but energy density decreases
Solution Approach 1:
The composite conductive agent system achieves high conductivity efficiency through synergistic interactions: carbon black provides dispersion and nucleation, carbon fiber provides structural framework, and carbon nanotubes provide high-conductivity channels. This efficient network structure reduces the total conductive agent content needed compared to traditional metal powder systems
Solution Approach 2:
The patent optimizes the ratios and morphologies of different conductive agent components to achieve percolation thresholds at lower overall conductive agent content. By controlling particle size distribution, aspect ratios, and interfacial interactions, the system achieves maximum conductivity with minimum conductive agent loading, preserving energy density
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 conductive adhesive forms a three-dimensional network structure that improves electron conduction and lithium ion deintercalation, enhancing battery performance and reducing production costs while maintaining high energy density.
Implementation Method 1
The conductive adhesive forms a three-dimensional network structure that improves electron conduction and lithium ion deintercalation
Data Source
AI summary
A conductive adhesive and its preparation method, a slurry and its preparation method, a silicon-containing lithium-ion battery and a computer-readable storage medium are provided. The conductive adhesive is consisted of a conductive agent, a binder and a solvent. The conductive agent is consisted of conductive spherical node substance, conductive fiber transition substance and tubular conductive substance. The conductive spherical node substance is at least one of carbon back, furnace black, acetylene black and Ketjen black. The conductive fiber transition substance is carbon fiber. The tubular conductive substance is single-walled carbon nanotube and/or few-walled carbon nanotube. The conductive adhesive of the present application has good dispersibility and high electrical conductivity.