Electrode Slurry Composition for Adhesion and Battery Cycle Output
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Solution Overview
Problem
Conventional slurry compositions for non-aqueous secondary battery electrodes fail to achieve a balance between high levels of close adherence to the current collector and optimal output and cycle characteristics.
Innovation Solution
A slurry composition for non-aqueous secondary battery electrodes containing olivine-type lithium phosphate compounds with a specific volume-average particle diameter and water-soluble polymers with a controlled average hydrodynamic radius, along with optional additives like carbon nanotubes and particulate conductive materials, to enhance adherence and performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional slurry compositions are used, then electrode formability is improved, but close adherence to current collector and output characteristics deteriorate
Solution Approach 1:
The patent applies parameter changes by precisely controlling the volume-average particle diameter of the olivine-type lithium phosphate compound within 0.5-3.0 μm and the average hydrodynamic radius of the water-soluble polymer within 10-30 nm. These specific parameter ranges optimize both the ease of manufacture (electrode formability) and reliability (close adherence to current collector), resolving the technical contradiction between these two features.
2Ease of manufacture
If conventional slurry compositions are used, then electrode formability is improved, but output characteristics and cycle characteristics deteriorate
Solution Approach 1:
The patent resolves this contradiction by optimizing parameters including the volume-average particle diameter of the olivine-type lithium phosphate compound (0.5-3.0 μm), the average hydrodynamic radius of the water-soluble polymer (10-30 nm), and the mass ratio of polymer to active material (1-10 parts by mass per 100 parts). These parameter changes simultaneously improve electrode formability and enhance output and cycle characteristics.
3Area of stationary object
If particle size of active material is reduced, then surface area increases, but close adherence and output characteristics deteriorate
Solution Approach 1:
The patent applies parameter changes by controlling the volume-average particle diameter of the olivine-type lithium phosphate compound within the optimal range of 0.5-3.0 μm. This parameter optimization ensures sufficient surface area for electrochemical reactions while maintaining adequate close adherence to the current collector and output characteristics, resolving the contradiction between increased surface area and maintained reliability.
Data Source
AI summary
A slurry composition for a non-aqueous secondary battery electrode contains an olivine-type lithium phosphate compound and a water-soluble polymer. The volume-average particle diameter D50 of the olivine-type lithium phosphate compound and the average hydrodynamic radius of the water-soluble polymer are within specific ranges.