Porous Negative Active Material for Battery Life-Capacity Balance
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Solution Overview
Problem
Current methods for prolonging the service life of energy storage devices often compromise capacity performance, making it difficult to balance overall performance indicators.
Innovation Solution
A negative active material with a porous structure comprising micropores, mesopores, and macropores, where the pore volumes satisfy specific ratios, optimizing lithium-ion channels and reducing lithium source consumption during SEI film formation, thereby enhancing cycle and rate performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of stationary object
If conventional methods are used to prolong service life, then service life is improved, but capacity performance deteriorates
Solution Approach 1:
The negative active material employs a porous structure with specifically controlled pore volumes and distributions (V1/V2 ratio between 0.5%-2% and V2/(V2+V3) ratio between 30%-50%) to create optimized lithium-ion channels. This porous architecture allows efficient lithium ion transport while reducing unnecessary lithium source consumption during SEI film formation, thereby simultaneously improving service life and maintaining capacity performance.
Solution Approach 2:
The invention optimizes the pore volume parameters V1, V2, and V3 to satisfy specific ratio relationships (0.5%≤V1/V2≤2% and 30%≤V2/(V2+V3)≤50%). By precisely controlling these parameter relationships rather than individual pore volumes alone, the material achieves balanced lithium-ion channel efficiency and reduced lithium source consumption, resolving the contradiction between service life extension and capacity maintenance.
2Duration of action of stationary object
If lithium source consumption is reduced during SEI film formation, then service life is improved, but kinetic performance deteriorates
Solution Approach 1:
The porous structure with controlled V1/V2 and V2/(V2+V3) ratios creates a hierarchical pore network that facilitates efficient lithium ion diffusion. The mesopores and macropores provide畅通 channels for rapid ion transport (maintaining kinetic performance), while the controlled overall porosity reduces excessive lithium source consumption during SEI formation (improving service life).
Solution Approach 2:
Different pore types (micropores, mesopores, macropores) are assigned different functional roles based on their volume ratios. Mesopores and macropores primarily provide fast ion transport channels for kinetic performance, while the controlled micropore content limits excessive lithium consumption. This local functional differentiation resolves the contradiction between service life and kinetic performance.
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 solution prolongs the service life of energy storage devices while maintaining high capacity performance, with cycle performance improved to over 99% and capacity retention rate, balancing kinetic performance and lithium source consumption.
Implementation Method 1
a porous structure having micropores, mesopores, and macropores, where a pore volume of the negative active material satisfies: 0.5%≤V1/V2≤2% and 30%≤V2/(V2+V3)≤50%
Data Source
AI summary
A negative active material includes a porous structure having micropores, mesopores, and macropores, where a pore volume of the negative active material satisfies: 0.5%≤V1/V2≤2% and 30%≤V2/(V2+V3)≤50%, where V1 represents a pore volume of the micropores in the negative active material, V2 represents a pore volume of the mesopores in the negative active material, and V3 represents a pore volume of the macropores in the negative active material.