Lithium Transition Metal Phosphate with Nano Rod-like Fe2P Crystals
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Solution Overview
Problem
Lithium transition metal phosphate materials, such as lithium iron phosphate, face challenges due to low electronic conductivity, ion conductivity, and the production of impurities like Fe2P, which affect the performance and scalability of lithium secondary batteries, particularly in applications like electric vehicles.
Innovation Solution
Incorporating nano rod-like Fe2P crystals into lithium transition metal phosphate and controlling exhaust conditions during the firing process to form these crystals, which enhances the high rate capability and low-temperature properties of lithium secondary batteries.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If lithium transition metal phosphate is used as cathode active material, then thermal stability and structural stability are improved, but electronic conductivity and ion conductivity are reduced
Solution Approach 1:
The patent changes the physical and chemical parameters of the material by incorporating Fe2P crystals with specific morphology (nano rod-like structure) and controlling their size and distribution within the lithium transition metal phosphate matrix, thereby improving electronic conductivity while maintaining structural stability
Solution Approach 2:
The patent creates a composite material system combining lithium transition metal phosphate with Fe2P crystals, where the Fe2P phase serves as a conductive network within the phosphate matrix, synergistically improving both conductivity and stability properties
2Stability of the object's composition
If heat treatment is performed to improve material properties, then structural stability is improved, but impurity production increases
Solution Approach 1:
The patent optimizes heat treatment parameters including temperature, time, and atmosphere to achieve the desired structural stability while minimizing impurity formation. Specific control of heating rate and holding time prevents excessive decomposition that would generate Fe2P and other impurities
Solution Approach 2:
The patent applies preliminary protective measures during heat treatment by controlling the oxidation atmosphere and using appropriate heating rates to prevent the formation of harmful impurities before they can form, rather than attempting to remove them afterward
3Reliability
If particle size is reduced to shorten lithium ion diffusion path, then ion conductivity is improved, but manufacturing precision and composition control become more difficult
Solution Approach 1:
The patent segments the material into ultrafine particles with controlled size distribution, creating numerous small particles rather than one large particle. This segmentation shortens the lithium ion diffusion path while the controlled segmentation process maintains composition uniformity across all particles
Solution Approach 2:
The patent precisely controls critical manufacturing parameters including particle size, size distribution, and composition ratios during the synthesis process. By optimizing these parameters, the patent achieves ultrafine particle formation with maintained compositional accuracy and uniformity
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 improves the high rate capability and low-temperature performance of lithium secondary batteries by forming nano rod-like Fe2P crystals, reducing impurity formation and maintaining structural stability, thereby enhancing battery efficiency and reliability.
Implementation Method 1
a firing step of performing heat treatment in a firing furnace
Implementation Method 2
Incorporating nano rod-like Fe2P crystals into lithium transition metal phosphate and controlling exhaust conditions during the firing process to form these crystals
Data Source
AI summary
The present invention relates to a lithium transition metal phosphate including nano rod-like Fe2P crystals, a method of preparing the same, and a lithium secondary battery manufactured by using the lithium transition metal phosphate. According to the present invention, a lithium transition metal phosphate including nano rod-like Fe2P crystals may be provided, thereby enhancing high rate capability and low-temperature properties of a lithium secondary battery prepared by using the same. Further, the whole or a part of an airflow direction in a firing furnace may be controlled to be in a direction opposite to a proceeding direction of a fired raw material by adjusting the exhaust conditions in the firing process, thereby providing a method of preparing a lithium transition metal phosphate, in which the nano rod-like Fe2P crystals are reproducibly included.