Composite Carbonate Synthesis for High Tap Density
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Solution Overview
Problem
Conventional methods for producing lithium nickel manganese cobalt composite oxides result in materials with low specific surface area and tap density, limiting their performance in lithium secondary batteries, particularly in rapid charge applications such as electric vehicles and power tools.
Innovation Solution
A composite carbonate is synthesized by reacting a solution containing nickel, manganese, and cobalt salts with a solution containing a metal carbonate or hydrogen carbonate, achieving a higher specific surface area and tap density, which enhances the performance of lithium nickel manganese cobalt composite oxides when used as a positive electrode active material.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional methods using nickel manganese cobalt composite hydroxides are used as starting raw materials, then the production process is simple, but the specific surface area of the resulting composite oxide is small
Solution Approach 1:
The invention changes the chemical form of the starting material from hydroxide to carbonate, and optimizes particle size parameters to 5-20 μm, achieving both high specific surface area (40-80 m2/g) and good manufacturability through controlled precipitation conditions
Solution Approach 2:
The invention performs preliminary preparation of nickel-manganese-cobalt composite carbonate with controlled particle size before the main synthesis reaction, ensuring the starting material has optimal properties for producing high-specific-surface-area composite oxide
2Area of stationary object
If composite carbonates with high specific surface area (40 m2/g or more) are produced using conventional methods, then the specific surface area requirement is met, but the tap density becomes low (less than 1.7 g/ml)
Solution Approach 1:
The invention optimizes multiple parameters simultaneously: particle size (5-20 μm), specific surface area (40-80 m2/g), and tap density (≥1.7 g/ml), achieving a balanced composite carbonate that meets all three requirements through controlled precipitation conditions
Solution Approach 2:
The invention creates a composite carbonate material with nickel, manganese, and cobalt in specific ratios, where the composite structure enables simultaneous achievement of high specific surface area and high tap density, overcoming the trade-off present in conventional single-material approaches
3Productivity
If the specific surface area of the positive electrode material is increased to improve rapid charge properties, then battery performance is enhanced, but the filling density of the positive electrode active material decreases
Solution Approach 1:
The invention optimizes particle size to 5-20 μm and specific surface area to 40-80 m2/g, achieving the right balance between rapid charge capability (requiring high surface area) and filling density (requiring reasonable particle size), thereby improving both productivity and quantity of substance
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 resulting composite oxide exhibits improved specific surface area and tap density, leading to enhanced battery performance, including better load properties and volume energy density, making it suitable for high-performance lithium secondary batteries.
Implementation Method 1
a composite carbonate is obtained by conducting a reaction by adding a solution (solution A) that contains a nickel salt, a manganese salt and a cobalt salt and a solution (solution B) that contains a metal carbonate or a metal hydrogen carbonate to a solution (solution C)
Data Source
AI summary
The present invention provides a method for producing a nickel atom-, manganese atom- and cobalt atom-containing composite carbonate that is high in specific surface area and large in tap density, and useful as a raw material for producing a lithium nickel manganese cobalt composite oxide to be used in a positive electrode active material for use in a lithium secondary battery. The composite carbonate includes nickel atoms, manganese atoms and cobalt atoms, and has an average particle size of 5 μm or more and less than 20 μm, a BET specific surface area of 40 to 80 m2/g and a tap density of 1.7 g/ml or more.