Lithium Cobalt Oxide Pouch Cell Preparation for Ambient Lab Testing
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Solution Overview
Problem
Current methods for testing lithium cobalt oxide battery materials require strict environmental conditions, leading to high laboratory operation and research and development costs, and are not suitable for accurately evaluating the performance of high-voltage materials.
Innovation Solution
A method for preparing lithium cobalt oxide soft-pack batteries that involves mixing lithium cobalt oxide with polyvinylidene fluoride and carbon black, coating on aluminum foil, rolling, slitting, and drying to create positive electrodes, and mixing graphite with carboxymethyl cellulose and styrene-butadiene rubber for negative electrodes, followed by assembly and electrolyte filling, allowing for characterization at ambient temperature.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If soft-pack batteries are prepared in a laboratory using conventional methods, then electrical performance testing can be conducted, but strict environmental temperature and humidity control is required, resulting in high laboratory operation costs
Solution Approach 1:
The invention changes the working conditions from requiring strict environmental control to operating at ambient temperature and humidity by optimizing the slurry composition and drying process parameters, allowing laboratory testing without complex environmental control systems
Solution Approach 2:
The invention uses a simple aluminum-plastic film packaging structure that can be prepared and used in ordinary laboratory conditions without requiring expensive, complex sealed battery structures, enabling cost-effective performance testing
2Ease of manufacture
If ball milling process is added for mixing materials, then electrode slurry can be prepared, but it introduces impurities and material loss, making it unable to accurately evaluate material performance
Solution Approach 1:
The invention extracts and removes the ball milling process from the electrode preparation workflow, using direct mixing methods instead, thereby eliminating the source of impurity introduction and material loss while maintaining slurry preparation capability
Solution Approach 2:
The invention uses a simplified mixing approach that replicates the essential function of ball milling (achieving uniform material distribution) without the harmful side effects, allowing accurate material performance evaluation
3Productivity
If complex equipment is used to improve liquid injection process, then production efficiency increases and defective rate reduces, but the equipment is more complicated and difficult to apply in a laboratory
Solution Approach 1:
The invention designs a liquid injection system that uses the battery structure itself and simple external equipment to achieve efficient electrolyte filling, eliminating the need for complex specialized injection equipment while maintaining high production efficiency
Solution Approach 2:
The invention creates a versatile preparation method that can be performed with ordinary laboratory equipment, making the process universally applicable in both laboratory and production settings without requiring specialized complex machinery
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 method enables accurate characterization of lithium cobalt oxide cathode materials at room temperature, reducing costs and allowing for the evaluation of different voltage variants, with a first cycle efficiency greater than 89% and 30-day capacity recovery rate greater than 94.7%, while maintaining good cycle and safety performance.
Implementation Method 1
Mixing a lithium cobalt oxide cathode material, polyvinylidene fluoride, carbon black and an organic solvent
Implementation Method 2
vacuumizing
Implementation Method 3
drying to obtain a positive electrode strip
Implementation Method 4
performing hot pressing to obtain a hot-pressed electric core
Implementation Method 5
heat-sealing the sides of the film
Implementation Method 6
vacuum drying to obtain a vacuum-dried pack
Data Source
AI summary
The invention belongs to the technical field of batteries, and discloses a preparation method and application of a lithium cobalt oxide soft-pack battery. The preparation method comprises the following steps: preparation of a lithium cobalt oxide positive electrode; preparation of a graphite negative electrode; preparation of an aluminum plastic film; screening and tab welding the positive and negative electrode, then winding core and packing, injecting an electrolyte to a resulting pack, perform first sealing, formation, second sealing; followed by capacity grading to obtain the lithium cobalt oxide soft pack battery. The preparation method for the lithium cobalt oxide soft-pack battery in a laboratory environment at room temperature provided by the present invention has simple operation and low environmental requirements, can be used in laboratories without dry room conditions, and reduces research and development cost and laboratory maintenance cost.