Water-Based Positive Electrode Slurry With Lithium-Containing Graphene
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Solution Overview
Problem
Conventional lithium-ion battery positive electrode slurry preparation using N-methylpyrrolidone (NMP) poses challenges such as difficult reclamation, high costs, and environmental pollution due to the deterioration of positive electrode active materials when exposed to water.
Innovation Solution
A positive electrode slurry incorporating a solid inclusion of lithium-containing graphene and a dispersant in water, which prevents performance deterioration by forming a hydrophilic layer on the active material, improving dispersibility and kinetic performance, and reducing solvent usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If water is used as solvent instead of NMP, then environmental pollution and cost are reduced, but positive electrode active material deteriorates due to water contact
Solution Approach 1:
Lithium-containing graphene serves as an intermediary substance between water and positive electrode active material. It forms a protective interface that allows water to be used as solvent while preventing direct contact between water and the active material, thus eliminating environmental pollution issues while maintaining material stability
Solution Approach 2:
The invention changes the chemical composition parameters of the slurry system by incorporating lithium-containing graphene with specific lithium content (0.1-5.0 mmol/g) and controlled water content (5-20 wt%). This parameter optimization enables water-based slurry to maintain both environmental friendliness and material stability
2Ease of manufacture
If water-based slurry is used, then reclamation difficulty and cost are reduced, but dispersibility of active material deteriorates
Solution Approach 1:
Lithium-containing graphene acts as a mediating dispersant between water and hydrophobic positive electrode active material. Its unique structure with lithium atoms on graphene sheets provides both hydrophilic interaction with water and hydrophobic interaction with active material, achieving excellent dispersibility in water-based slurry
Solution Approach 2:
The invention creates a composite slurry system comprising water, lithium-containing graphene, and positive electrode active material. The lithium-containing graphene forms a composite structure that combines the benefits of water-based ease of manufacture with improved dispersibility through its unique chemical composition and structure
3Ease of operation
If lithium-containing graphene is added to improve dispersibility, then processing performance is improved, but slurry complexity increases
Solution Approach 1:
Lithium-containing graphene performs multiple functions simultaneously: it acts as a dispersant to improve slurry homogeneity, as a protective barrier to prevent water-induced material deterioration, and as a lithium ion source to enhance battery performance. This multi-functionality reduces the need for multiple separate additives, thereby simplifying the overall slurry formulation
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 lithium-containing graphene-covered slurry enhances the dispersibility and processing of positive electrode active materials, preventing water-induced deterioration and improving lithium ion transportation, resulting in better kinetic performance and reduced environmental impact.
Implementation Method 1
the lithium-containing graphene is able to cover the positive electrode active material in the positive electrode slurry, avoiding performance deterioration for the positive electrode active material coming in contact with water
Implementation Method 2
The lithium-containing graphene at least partially covering the surface of the positive electrode active material can form a hydrophilic layer on the surface of the positive electrode active material, improving the dispersibility
Implementation Method 3
lithium ions in the lithium-containing graphene can further improve lithium ion transportation on the positive electrode plate to implement better kinetic performance
Implementation Method 4
A sulfonic acid group in the lithium-containing sulfonic acid-based graphene can further improve the dispersibility of the positive electrode active material in the positive electrode slurry through electrostatic repulsion
Data Source
AI summary
This application provides a positive electrode slurry including a solid inclusion and water, where the solid inclusion includes a positive electrode active material capable of intercalating and deintercalating lithium ions and lithium-containing graphene.