LiMnTi Cathode Material Hydrothermal Ion Exchange for Higher Capacity
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Solution Overview
Problem
Industrial mass production of LiMnTi-containing oxides for lithium-ion secondary batteries is challenging due to the low productivity of existing methods like the molten salt and solution methods, which require a step of replacing Na with Li, and the resulting materials have low electric capacity.
Innovation Solution
A hydrothermal treatment method is used to convert NaMnTi-containing oxides into LiMnTi-containing oxides with specific lattice constants and diffraction peaks, allowing for high productivity and increased electric capacity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the molten salt method or solution method is used to replace Na with Li in NaMnTi-containing oxide, then LiMnTi-containing oxide can be obtained, but the productivity is low and industrial mass production is difficult
Solution Approach 1:
The patent changes the chemical environment parameters by using aqueous nitric acid solution instead of molten salt or lithium compound solution. This parameter change enables direct hydrothermal treatment of NaMnTi-containing oxide to obtain LiMnTi-containing oxide with tunnel structure Pbam, significantly improving productivity while maintaining ease of manufacture through a simpler aqueous-based process
Solution Approach 2:
The patent replaces the complex molten salt system or solution-based ion exchange system with a hydrothermal treatment system using aqueous nitric acid. This substitution simplifies the manufacturing process by using water-based chemistry at elevated temperatures and pressures, making the process more suitable for industrial mass production
2Quantity of substance
If existing methods are used to manufacture LiMnTi-containing oxide, then the material can be produced, but the electric capacity is low
Solution Approach 1:
The patent achieves higher electric capacity by changing the synthesis parameters to produce LiMnTi-containing oxide with specific lattice constants (a: 9.0420-9.1640 Å, b: 24.294-25.968 Å, c: 2.8820-2.8935 Å) through hydrothermal treatment. This parameter optimization enables both high productivity and high electric capacity simultaneously
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 the production of LiMnTi-containing oxides with enhanced crystallinity and higher electric capacity, facilitating industrial mass production and improved battery performance.
Implementation Method 1
a step of performing a hydrothermal treatment on a NaMnTi-containing oxide to produce a LiMnTi-containing oxide
Implementation Method 2
a step of performing a hydrothermal treatment on a NaMnTi-containing oxide in an aqueous nitric acid solution to produce a LiMnTi-containing oxide
Data Source
AI summary
A method for manufacturing a positive electrode active material for a lithium-ion secondary battery according to one embodiment of the present invention comprises a step of performing a hydrothermal treatment on a specific NaMnTi-containing oxide having a tunnel structure Pbam in a lithium nitrate aqueous solution to produce a LiMnTi-containing oxide.