Positive Electrode Slurry Composition for Crack-Resistant Coating
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Solution Overview
Problem
Lithium-ion battery energy density is limited by the cracking and brittleness of positive electrode plates during the coating and cold pressing processes, leading to material inefficiencies and increased costs.
Innovation Solution
Incorporating a polyether polyol with a specific constitutional formula into the positive electrode slurry, which forms hydrogen bonds and covalent bonds with the active substances and collector, enhancing the flexibility and stability of the electrode plate, thereby increasing the maximum coating weight and energy density.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the coating weight of positive electrode plates is increased to improve energy density, then the energy density of lithium-ion batteries is improved, but the electrode plates become more prone to cracking and brittleness during manufacturing
Solution Approach 1:
The patent changes the chemical composition parameters of the electrode slurry by introducing polyether polyol with specific molecular weight (1,000-80,000) and structural parameters (formula with R1-R6 groups and n=10-2000). This parameter change modifies the binding properties and flexibility of the electrode plate, allowing it to maintain reliability while achieving higher coating weights and energy density.
Solution Approach 2:
The patent creates a composite material system by combining polyether polyol with traditional electrode components (active substances, conductive agents, binders). The polyether polyol acts as a flexible binder component that forms hydrogen bonds and covalent bonds with active substances, creating a composite structure that resists cracking while supporting higher coating weights.
2Use of energy by moving object
If the coating weight of positive electrode plates is increased to improve energy density, then the energy density of lithium-ion batteries is improved, but the manufacturing process becomes more difficult and risky
Solution Approach 1:
The patent modifies the slurry composition parameters by adding polyether polyol with controlled molecular weight (1,000-80,000) and structural parameters. This changes the rheological and binding properties of the slurry, making it easier to manufacture high coating weight electrode plates without cracking or defects, thus improving ease of manufacture while maintaining high energy density.
Solution Approach 2:
The polyether polyol acts as an intermediary substance between the active substances and the collector, forming hydrogen bonds and covalent bonds that facilitate better adhesion and flexibility. This intermediary role simplifies the manufacturing process by reducing the risk of cracking and defects during coating and cold pressing, making high energy density electrode plates easier to manufacture.
3Strength
If conventional binders are used in the positive electrode slurry, then the electrode plate maintains structural integrity, but the flexibility and maximum coating weight are limited
Solution Approach 1:
The patent changes the chemical structure parameters of the binder by using polyether polyol with specific molecular weight (1,000-80,000) and structural formula (with R1-R6 groups and n=10-2000). This parameter change provides both structural integrity through covalent bonding and flexibility through the polyether chain structure, overcoming the limitations of conventional binders.
Solution Approach 2:
The patent creates a composite binding system where polyether polyol combines with traditional binder components to provide both strength and flexibility. The polyether polyol forms a composite structure with active substances through hydrogen bonds and covalent bonds, achieving superior mechanical properties that conventional single-material binders cannot provide.
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 polyether polyol improves the flexibility and stability of the positive electrode plate, reducing cracking and material usage, resulting in higher energy density and lower production costs for lithium-ion batteries.
Implementation Method 1
the polyether polyol forms hydrogen bonds and covalent bonds with the active substances and collector
Implementation Method 2
the polyether polyol forms hydrogen bonds and covalent bonds with the active substances and collector
Data Source
AI summary
The present disclosure provides a positive electrode slurry containing polyether polyol, where the polyether polyol has the following constitutional formula:where R1, R2, R3, R4, R5, and R6 are as defined in the specification.