Boron-Doped Olivine Cathode Material for High-Output Battery Production
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Solution Overview
Problem
The production of cathodes using cathode active materials with large specific surface areas often results in decreased productivity due to material handling and processing challenges.
Innovation Solution
A method of producing a cathode active material for secondary batteries involving a mixture of lithium, phosphate, iron, carbon, boron, and a liquid medium, which is granulated and then heat-treated to form a lithium transition metal compound with an olivine structure, maintaining a boron content between 0 ppm and 1900 ppm and a specific surface area of 15 m2/g or more.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the specific surface area of cathode active material is enlarged to obtain high output characteristics, then output characteristics are improved, but productivity deteriorates due to material handling and processing challenges
Solution Approach 1:
The patent applies parameter changes by controlling the boron content within a specific range (0-1900 ppm) and managing the specific surface area (15 m2/g or more) to optimize both output characteristics and productivity. By adjusting these parameters, the invention resolves the contradiction between achieving high power output and maintaining efficient production.
Solution Approach 2:
The patent uses composite materials by incorporating boron into the lithium transition metal compound with olivine structure. This composite approach modifies the material properties to achieve favorable output characteristics while maintaining productivity, as the boron doping creates a composite structure that balances surface area benefits with processability.
2Power
If the specific surface area of cathode active material is increased, then output characteristics are improved, but cathode production becomes difficult due to handling and processing challenges
Solution Approach 1:
The patent applies parameter changes by precisely controlling boron content (0-1900 ppm) and specific surface area (15 m2/g or more) to achieve a balance where high output characteristics are obtained while the material remains manufacturable. This parameter optimization resolves the contradiction between performance and ease of manufacture.
Solution Approach 2:
The invention uses composite materials by doping boron into the lithium transition metal compound, creating a material with modified properties that maintain high surface area while improving manufacturability. The boron-composite structure facilitates handling and processing while preserving output characteristics.
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
This approach reduces the viscosity of cathode material pastes, enabling the production of cathodes with favorable output characteristics while maintaining productivity, and results in a cathode active material with improved specific surface area and boron content.
Implementation Method 1
heat-treating the precursor to obtain a lithium transition metal compound having an olivine structure
Data Source
AI summary
A method of producing a cathode active material for a secondary battery is provided. The method includes preparing a mixture comprising a lithium source, a phosphate source, an iron source, a carbon source, a boron source comprising an oxo acid of boron, and a liquid medium; granulating the mixture to obtain a precursor; and heat-treating the precursor to obtain a lithium transition metal compound having an olivine structure, wherein in the mixture, a total molar amount of boron atoms contained in the boron source is more than 0% and less than 3% with respect to a total molar amount of iron atoms contained in the iron source as 100%.