Lithium Composite Oxide Co-precipitation Density Control
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Solution Overview
Problem
Lithium-ion secondary batteries face challenges in achieving high particle density and tap density due to issues with nickel content affecting seed formation and thermal stability in nickel-manganese-cobalt composite oxides prepared by co-precipitation, leading to incomplete growth of particles and reduced capacity.
Innovation Solution
A method is developed to adjust the concentration of nickel and pH in the co-precipitation reaction by varying the basic solution concentration and pH levels, ensuring uniform particle growth and concentration gradients, resulting in a lithium composite oxide with improved particle density and tap density.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the amount of nickel is increased in the co-precipitation reaction, then the capacity of the lithium-ion secondary battery is improved, but the particle density among primary particles degrades and tap density decreases
Solution Approach 1:
The patent segments the co-precipitation process into two distinct stages: a first co-precipitation reaction to form initial particles with controlled nickel content, and a second co-precipitation reaction to form final particles with higher nickel content. This segmentation allows the particle density to be controlled during the first stage while achieving high nickel content in the final product, thus resolving the contradiction between nickel content and particle density
Solution Approach 2:
The patent performs preliminary action by conducting the first co-precipitation reaction to form particles with lower nickel content and controlled density before adding additional nickel salts and performing the second co-precipitation reaction. This preliminary formation of particles with good density provides a foundation that prevents the degradation of particle density even when nickel content is increased in the subsequent reaction
2Quantity of substance
If the amount of nickel is increased in the co-precipitation reaction, then the capacity of the lithium-ion secondary battery is improved, but the tap density decreases
Solution Approach 1:
The patent segments the co-precipitation process into two distinct stages: a first co-precipitation reaction to form initial particles with controlled nickel content, and a second co-precipitation reaction to form final particles with higher nickel content. This segmentation allows the particle density to be controlled during the first stage while achieving high nickel content in the final product, thus resolving the contradiction between nickel content and tap density
Solution Approach 2:
The patent performs preliminary action by conducting the first co-precipitation reaction to form particles with lower nickel content and controlled density before adding additional nickel salts and performing the second co-precipitation reaction. This preliminary formation of particles with good density provides a foundation that prevents the degradation of tap density even when nickel content is increased in the subsequent reaction
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 enhances the particle density and tap density of lithium composite oxides, enabling the production of high-capacity lithium-ion secondary batteries with improved thermal characteristics and extended cycle life.
Implementation Method 1
adjusting the pH of a reacting solution and the amount of a basic solution added during the preparation of a transition-metal composite oxide through a co-precipitation reaction
Implementation Method 2
preparation of a transition-metal composite oxide through a co-precipitation reaction
Data Source
AI summary
The present invention relates to a method for preparing a lithium composite oxide and a lithium composite oxide prepared thereby and, more specifically, to: a method for preparing a lithium composite oxide, capable of preparing a lithium-ion secondary battery with high capacity by adjusting the amount of a basic solution added according to the nickel content during the preparation of a lithium composite oxide through a co-precipitation reaction, thereby adjusting the pH of the reactor, and thus improving the particle density and increasing the tap density, and a lithium composite oxide prepared thereby.