Nickel Composite Pore Distribution for Li Battery Cathode Efficiency
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Solution Overview
Problem
Existing lithium secondary batteries require improvements in initial charge and discharge efficiency to meet the expanding demands of lithium secondary battery applications.
Innovation Solution
A metal composite compound with specific pore volume distribution characteristics, represented by Formula (I), is used to produce a positive electrode active material through calcination with a lithium compound, ensuring uniform penetration and reaction, thereby enhancing initial charge and discharge efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a metal composite compound with conventional pore structure is used, then the manufacturing process is simple, but the initial charge and discharge efficiency is low
Solution Approach 1:
The invention changes the pore distribution parameters of the metal composite compound by controlling the ratio A/B (integrated area of 1-50 nm pores to integrated area of 50-200 nm pores) to be 0.05 or more and less than 1.5. This parameter optimization enables uniform penetration of lithium compounds during calcination, thereby improving initial charge and discharge efficiency without requiring complex manufacturing processes
Solution Approach 2:
The invention creates local quality differences in the pore structure by establishing specific pore diameter distributions with multiple maximum points in different regions (20-50 nm and 50-200 nm). This localized pore structure optimization ensures that lithium compounds can penetrate uniformly throughout the material, resolving the contradiction between efficiency improvement and process complexity
2Reliability
If the pore diameter distribution is optimized for high efficiency, then initial charge and discharge efficiency improves, but the manufacturing precision requirement increases
Solution Approach 1:
The invention performs preliminary action by pre-establishing the optimal pore distribution (A/B ratio between 0.05 and 1.5 with specific maximum points) in the metal composite compound before the calcination process. This preliminary optimization of pore structure ensures that subsequent lithium compound penetration occurs uniformly, achieving high initial charge and discharge efficiency while maintaining manageable manufacturing precision requirements
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 described method results in a lithium secondary battery with improved initial charge and discharge efficiency by optimizing pore distribution and uniform lithium compound penetration within the electrode material.
Implementation Method 1
when a differential pore volume distribution is determined by a Barrett-Joyner-Halenda method from a nitrogen gas adsorption isotherm
Data Source
Figure 1~2
AI summary
A metal composite compound is provided with which a lithium secondary battery having high initial charge and discharge efficiency can be produced. A metal composite compound containing at least Ni, in which in the metal composite compound, when in a differential pore volume distribution determined by a Barrett-Joyner-Halenda method from a nitrogen gas adsorption isotherm, an integrated area of a region where a pore diameter is 1 nm or more and 50 nm or less is A, and an integrated area of a region where the pore diameter is more than 50 nm and 200 nm or less is B, A/B is 0.05 or more and less than 1.5.