Lithium Ferric Manganese Phosphate Synthesis via Solid-Solution Precursor
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Solution Overview
Problem
The manufacturing processes for Lithium Metal Phosphate Nano-Co-crystalline (LMP-NCO) batteries are unstable due to reduction-oxidation reactions and agglomeration effects, leading to inconsistent product size and suboptimal battery performance.
Innovation Solution
A preparation method involving phosphoric acid, metal sources, and water to produce solid-solution precursors, which are then calcined to reduce the frequency of reduction-oxidation reactions and enhance stability, resulting in lithium ferric manganese phosphate or lithium ferric manganese phosphate nano-co-crystalline olivine battery composite materials with improved electric performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional preparation methods using lithium ferric phosphate and lithium manganese phosphate are employed, then the manufacturing process involves reduction-oxidation reactions, but the stability of the manufacturing process deteriorates and the difficulty increases
Solution Approach 1:
The patent applies preliminary action by pre-mixing metal salts (ferric chloride and manganese chloride) with phosphoric acid and water to form a homogeneous precursor solution before calcination. This preliminary mixing ensures uniform distribution of metal ions, eliminating the need for subsequent reduction-oxidation reactions and multiple processing steps, thereby stabilizing the manufacturing process and reducing complexity
Solution Approach 2:
The patent changes the chemical parameters by using metal chlorides instead of traditional metal phosphates, and controlling the calcination temperature (400-600°C) to directly form the desired lithium ferric manganese phosphate compound. This parameter change eliminates reduction-oxidation reactions and simplifies the manufacturing process while maintaining product stability
2Manufacturing precision
If conventional preparation methods are used, then the process is simplified, but agglomeration effects occur between compounds causing product size to not meet practical demands
Solution Approach 1:
The patent applies local quality by controlling the calcination process at specific temperature ranges (400-600°C) to achieve uniform particle size distribution. The precursor solution is prepared with specific concentrations of metal salts and phosphoric acid, ensuring localized uniformity throughout the mixture, which prevents agglomeration during calcination and produces consistent product size meeting practical requirements
Solution Approach 2:
The patent changes physical parameters by controlling calcination temperature (400-600°C), pH value (2-4), and solution concentration to prevent agglomeration. These parameter optimizations ensure uniform particle formation during calcination, achieving precise product size control while maintaining ease of manufacture through a single-step process
3Reliability
If conventional preparation methods are employed, then the process is straightforward, but the battery performance cannot meet expected levels due to agglomeration
Solution Approach 1:
The patent applies preliminary action by preparing a well-mixed precursor solution with controlled pH (2-4) and specific metal salt concentrations before calcination. This preliminary preparation ensures uniform distribution of metal ions and prevents agglomeration, directly improving battery performance while keeping the overall process simple with only one calcination step required
Solution Approach 2:
The patent optimizes chemical parameters including pH value (2-4), metal salt to phosphoric acid ratio, and calcination temperature (400-600°C) to produce high-quality lithium ferric manganese phosphate material with consistent particle size and composition. These parameter changes improve battery performance by eliminating agglomeration effects while maintaining manufacturing process simplicity
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 stabilizes the manufacturing process, reduces manufacturing difficulties, and enhances the battery's electric performance by providing two stable charging and discharging platforms.
Implementation Method 1
processing a reaction of the first metal source, the second metal source, the phosphoric acid and the water to produce a first product
Implementation Method 2
calcining the first product to produce a first precursor or a second precursor
Implementation Method 3
calcining the reaction mixture to produce the battery composite material
Implementation Method 4
a lack of stability of the manufacturing processes is caused by the reduction-oxidation reactions
Data Source
AI summary
A preparation method of a battery composite material includes steps of providing phosphoric acid, a first metal source, a second metal source and water, processing a reaction of the first metal source, the second metal source, the phosphoric acid and the water to produce a first product, calcining the first product to produce a first precursor or a second precursor, among which each of the first precursor and the second precursor is a solid-solution containing first metal and second metal, and processing a reaction of the first precursor or the second precursor, and a first reactant to obtain a reaction mixture, and then calcining the reaction mixture to produce the battery composite material. As a result, the battery product has two stable charging and discharging platforms, such that the present invention achieves the advantages of enhancing the stability and the electric performance.