Precursor Porous Structure for Battery Cathode Ion Transport
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Solution Overview
Problem
Existing methods for manufacturing lithium ion secondary battery positive-electrode active materials do not effectively address the need for reducing the moving distance between the positive and negative electrodes, leading to suboptimal performance due to lack of consideration for the particle structure and internal structure of secondary particles.
Innovation Solution
A positive-electrode active material precursor for nonaqueous electrolyte secondary batteries is developed, comprising a nickel-cobalt-manganese carbonate composite with a hydrogen-containing functional group, specifically formulated to produce porous particles with uniform pores, enhancing battery performance by adjusting the composition and distribution of additional elements like molybdenum.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional manufacturing methods are used for positive-electrode active materials, then the production process is simple, but the particle structure lacks uniform pores and the internal structure of secondary particles is not optimized
Solution Approach 1:
The patent applies preliminary action by incorporating a hydrogen-containing functional group into the precursor material before the main manufacturing process. This pre-introduced functional group subsequently reacts during heat treatment to form uniform pores within particles and optimizes the internal structure of secondary particles, achieving the desired particle structure without complicating the overall manufacturing process.
2Productivity
If the moving distance between positive and negative electrodes is not reduced, then the battery structure is simple, but the battery output performance is insufficient
Solution Approach 1:
The patent utilizes porous materials by creating uniform pores within the positive-electrode active material particles through the hydrogen-containing functional group. These pores increase the specific surface area and provide multiple pathways for lithium ion diffusion, effectively reducing the moving distance for ions within the particle structure and thereby enhancing battery output performance.
3Reliability
If additional elements are not optimized in composition and distribution, then the manufacturing process is straightforward, but the cycle characteristics and discharge capacity are suboptimal
Solution Approach 1:
The patent applies local quality by optimizing the composition and distribution of additional elements within the precursor material. Specific elements are strategically positioned and distributed at controlled concentrations to enhance cycle characteristics and initial discharge capacity, while the systematic approach to composition control maintains ease of manufacture through defined formulation parameters.
Data Source
AI summary
A positive-electrode active material precursor for a nonaqueous electrolyte secondary battery is provided that includes a nickel-cobalt-manganese carbonate composite represented by general formula NixCoyMnzMtCO3 (where x+y+z+t=1, 0.05≤x≤0.3, 0.1≤y≤0.4, 0.55≤z≤0.8, 0≤t≤0.1, and M denotes at least one additional element selected from a group consisting of Mg, Ca, Al, Ti, V, Cr, Zr, Nb, Mo, and W) and a hydrogen-containing functional group, wherein H/Me representing the ratio of the amount of hydrogen to the amount of metal components Me included in the positive-electrode active material precursor is greater than or equal to 1.60.