Lithium Manganese Composite Oxide Battery Electrode Design
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Solution Overview
Problem
Lithium ion secondary batteries face challenges in achieving voltage compatibility, output characteristics, and charge-discharge cycle characteristics when used in combination with lead-acid storage batteries, particularly in reducing the load on lead-acid batteries and maintaining performance during rapid charging and discharging.
Innovation Solution
A nonaqueous electrolyte battery is designed with a positive electrode containing lithium-manganese composite oxide (LiMn 2-x M x O 4) and a negative electrode containing lithium titanate (Li 4 Ti 5 O 12), where x is between 0.22 and 0.7, and the pore specific surface area of the positive electrode layer is between 2 and 5 m^2/g, optimizing the capacity ratio between the electrodes to enhance voltage compatibility and cycle performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the pore specific surface area of the positive electrode layer is increased to improve output characteristics, then the output characteristics are improved, but the charge-discharge cycle characteristics deteriorate
Solution Approach 1:
The patent optimizes the pore specific surface area parameter to a specific range (2-5 m²/g) to achieve the best balance between output characteristics and cycle life. This parameter optimization resolves the contradiction by finding the optimal value that satisfies both requirements simultaneously.
2Adaptability or versatility
If the substitution amount x in LiMn2-xMxO4 is increased to improve voltage compatibility with lead-acid batteries, then voltage compatibility is improved, but the capacity of the positive electrode decreases
Solution Approach 1:
The patent optimizes the substitution amount x to a specific range (0.22 ≤ x ≤ 0.7) to achieve the best balance between voltage compatibility and electrode capacity. This parameter optimization resolves the contradiction by finding the optimal substitution level that maintains both compatibility and capacity.
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 battery exhibits excellent voltage compatibility, output characteristics, and charge-discharge cycle characteristics, reducing the load on lead-acid batteries and maintaining performance even during rapid charging and discharging, thus efficiently regenerating energy and extending battery life.
Implementation Method 1
A pore specific surface area obtained by a BET method using N2-adsorption of the positive electrode layer is 2 m2
Data Source
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AI summary
According to one embodiment, a nonaqueous electrolyte battery is provided. The nonaqueous electrolyte battery includes a positive electrode including a positive electrode, a negative electrode including a negative electrode, and a nonaqueous electrolyte battery. The positive electrode layer contains lithium-manganese composite oxide represented by a general formula of LiMn2-xMxO4. x is within the range of 0.22 ≤ x ≤ 0.7 and M is at least one element selected from a group consisting of Mg, Ti, Cr, Fe, Co, Zn, Al, and Ga. The negative electrode layer contains lithium titanate Li4Ti5O12. A pore specific surface area of the positive electrode layer is 2 m2/g or more and less than 5 m2/g. A ratio of a capacity of the positive electrode per pore surface area of the positive electrode layer to a capacity of the negative electrode per pore surface area of the negative electrode layer is within the range of 1 or more and less than 2.4.