Positive Electrode Slurry Composition for High-Coating-Weight Batteries
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Solution Overview
Problem
Lithium-ion batteries face challenges in increasing energy density while maintaining manufacturing safety and reducing material costs, as higher coating weights of positive electrode plates lead to fabrication difficulties and risks.
Innovation Solution
A positive electrode slurry containing polyether polyol is developed, which improves the flexibility and coating weight of the positive electrode plate, reducing material usage and costs, and enhancing energy density by forming hydrogen bonds and ensuring stability during the battery's preparation.
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 energy density is improved, but manufacturing reliability deteriorates due to serious risks in electrode plate fabrication
Solution Approach 1:
The patent changes the chemical composition parameters of the slurry by introducing polyether polyol with specific molecular weight range (1000-80000) and controlling its content (0.1-5 wt% relative to binder). This parameter optimization allows achieving higher coating weights while maintaining slurry stability and electrode plate fabrication reliability, resolving the contradiction between energy density improvement and manufacturing reliability.
Solution Approach 2:
The patent creates a composite slurry system combining traditional binder materials (PVDF, CMC, SBR) with polyether polyol. This composite approach leverages the adhesive properties of conventional binders while adding the flexibility and gel prevention capabilities of polyether polyol, enabling high coating weight application without compromising manufacturing reliability or causing electrode plate cracking.
2Use of energy by moving object
If the coating weight of positive electrode plates is increased to improve energy density, then energy density is improved, but ease of manufacture deteriorates due to difficulties in cell fabrication
Solution Approach 1:
The patent optimizes slurry parameters by controlling polyether polyol molecular weight (1000-80000) and content (0.1-5 wt%), which improves slurry processability and coating uniformity. This enables easier manufacturing of high coating weight electrode plates without fabrication difficulties, resolving the contradiction between energy density improvement and ease of manufacture.
Solution Approach 2:
The polyether polyol acts as an intermediary substance between the binder and active material particles. It mediates the interaction by providing additional adhesion and flexibility, allowing the slurry to maintain good coating properties and fabrication characteristics even at higher coating weights, thus improving ease of manufacture while achieving higher energy density.
3Quantity of substance
If polyether polyol is added to improve flexibility and coating weight, then coating weight is improved, but loss of substance increases due to potential gelation
Solution Approach 1:
The patent carefully controls the polyether polyol content (0.1-5 wt% relative to binder) and molecular weight (1000-80000) to optimize the balance between achieving high coating weight and preventing gelation. This parameter optimization ensures sufficient coating weight improvement while minimizing material loss through gelation, resolving the contradiction between coating weight enhancement and material loss prevention.
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 use of polyether polyol in the positive electrode slurry significantly increases energy density, reduces material costs, and improves the flexibility and stability of the battery, preventing cracking and gelation issues, thus enhancing the overall performance and efficiency of lithium-ion batteries.
Implementation Method 1
due to the improvement of the positive electrode plate, the amount of material for fabricating a cell can be reduced, thus reducing the total material cost of the cell
Data Source
AI summary
A positive electrode slurry containing polyether polyol, where the polyether polyol has the following constitutional formula:where n1, n2, n3, R1, R2, R3, R4, R5, R6, B1, and B2 are as defined in the specification are described. The addition of the polyether polyol described in this application can increase a coating weight of positive electrode plates, thereby increasing energy density of batteries.