Lithium Iron Phosphate Synthesis With Emulsion-Polymerized Precursors
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional lithium iron phosphate positive electrode material synthesis processes are energy-intensive due to stirring and ball milling, and often result in uneven raw material mixing, leading to impure sintered components and reduced material performance.
Innovation Solution
A method involving the use of an emulsifier to disperse a lithium source, followed by polymerization reactions and subsequent mixing with an iron and phosphorus source, controlled pH adjustment, and calcination to produce nano-scale lithium iron phosphate without pulverization, ensuring even element distribution and reduced energy consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If conventional solid-phase synthesis method is used, then lithium iron phosphate can be synthesized, but high energy consumption is caused by stirring and ball milling
Solution Approach 1:
The patent replaces mechanical ball milling with a chemical precipitation method. Instead of using mechanical force to mix and grind materials, the invention uses in-situ chemical reactions to form lithium iron phosphate directly, eliminating the need for high-energy ball milling while achieving homogeneous mixing at the molecular level
Solution Approach 2:
The patent changes the synthesis approach from solid-phase to liquid-phase chemistry. By controlling pH parameters and using aqueous solutions of metal salts, the method enables direct precipitation of nanostructured lithium iron phosphate, avoiding mechanical processing and significantly reducing energy consumption
2Manufacturing precision
If conventional solid-phase synthesis method is used, then lithium iron phosphate can be synthesized, but raw materials are unevenly mixed leading to impure sintered components
Solution Approach 1:
The patent replaces mechanical mixing with chemical mixing in solution phase. Metal salts are dissolved in aqueous solutions and mixed at the molecular level, ensuring uniform distribution of lithium, iron, and phosphorus species before precipitation, which eliminates the inhomogeneity problems associated with mechanical ball milling
Solution Approach 2:
The patent performs preliminary dissolution of metal salts in aqueous solutions before the precipitation reaction. This pre-mixing step ensures that all metal ions are uniformly distributed in the solution phase, creating a homogeneous precursor that leads to uniform composition in the final lithium iron phosphate product
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 method simplifies the synthesis process, reduces energy consumption, and enhances the capacity and rate capability of lithium iron phosphate as a positive electrode material by achieving even element distribution and eliminating the need for pulverization.
Implementation Method 1
dispersing a lithium source by using an emulsifier
Implementation Method 2
adding a first initiator, and carrying out a first polymerization reaction
Implementation Method 3
adding a crosslinking agent and a second initiator to the intermediate product A, and carrying out a second polymerization reaction
Implementation Method 4
a pH of the reaction system of the third reaction is kept at 2.1 to 2.3 by adding ammonia water
Implementation Method 5
mixing the intermediate product B, an oxidant, an iron source and a phosphorus source, and carrying out a third reaction to obtain an intermediate product C
Implementation Method 6
dispersing the intermediate product C by using a glucose solution
Implementation Method 7
drying and calcining to obtain the lithium iron phosphate
Data Source
AI summary
The present disclosure provides a lithium iron phosphate, a preparation method thereof, and an application thereof. The preparation method includes: dispersing a lithium source by using an emulsifier, then adding a first initiator, and carrying out a first polymerization reaction to obtain an intermediate product A; adding a mixed solution of methyl methacrylate, a crosslinking agent and a second initiator to the intermediate product A, and carrying out a second polymerization reaction to obtain an intermediate product B; mixing the intermediate product B, an oxidant, an iron source and a phosphorus source, and carrying out a third reaction to obtain an intermediate product C; and dispersing the intermediate product C by using a glucose solution, and carrying out drying and calcining to obtain the lithium iron phosphate. The lithium iron phosphate has evenly distributed elements, and has good charge and discharge properties.