Lithium-Rich Oxide Supplementing Material for Battery Capacity Compensation
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Solution Overview
Problem
Existing lithium-ion batteries face challenges in energy density and cycle life due to lithium loss during the first charging cycle, and existing lithium supplementing materials are unstable, difficult to synthesize in large quantities, and incompatible with common solvents and binders.
Innovation Solution
A positive electrode lithium supplementing material comprising compounds like Li2NiO2, Li2MoO3, Li5FeO4, Li5Fe0.9Al0.1O4, or Li6MnO4, with specific particle sizes and compositions, is used, along with a double-layer coating method to ensure stability and compatibility, enhancing delithiation capacity and safety.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If stabilized metal lithium powder or organic lithium salt is used as lithium supplementing material, then capacity loss during first charging can be compensated, but the material reacts with common slurry solvent NMP and cannot be stored stably for long time
Solution Approach 1:
The patent changes the chemical composition parameters of the lithium supplementing material from highly reactive metal lithium or organic lithium salt to lithium-rich oxide compounds (Li2M1O2, Li2M2O3, Li5FexM31-xO4, or Li6MnymM41-yO4) with controlled stoichiometry and cation distribution, achieving both capacity compensation and long-term storage stability
Solution Approach 2:
The patent uses composite lithium-rich oxide materials containing multiple metal elements (Ni, Mn, Cu, Fe, Cr, Mo) in specific ratios, creating a composite structure that combines high lithium content with chemical stability, resolving the contradiction between reactivity for capacity compensation and stability for storage
2Reliability
If existing positive electrode lithium supplementing materials are used, then capacity loss can be compensated, but they are easily oxidized in air and difficult to synthesize in large quantities
Solution Approach 1:
The patent segments the synthesis process into controlled steps: preparing precursor materials with specific compositions, controlling sintering temperature and atmosphere, and managing particle size distribution, making large-scale production feasible while maintaining material stability and capacity compensation properties
Solution Approach 2:
The patent optimizes synthesis parameters including sintering temperature, oxygen partial pressure, and cooling rate to produce stable lithium-rich oxide materials that resist air oxidation, enabling easy large-scale manufacturing while maintaining capacity compensation functionality
3Use of energy by moving object
If lithium-rich oxide material is used to supplement lithium, then energy density can be improved, but polarization may increase due to material properties
Solution Approach 1:
The patent creates local quality optimization by controlling particle size distribution and cation distribution within the lithium-rich oxide particles, ensuring uniform lithium ion diffusion paths and reducing concentration polarization while maintaining high energy density
Solution Approach 2:
The patent uses composite lithium-rich oxide materials with multiple metal elements that provide synergistic effects, improving electronic conductivity and lithium ion diffusion kinetics, thereby reducing polarization loss while maintaining high energy density
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 significantly improves the energy density and safety of lithium-ion batteries by stabilizing the lithium supplementing material, reducing polarization, and preventing micro-short circuits, while being easier to produce and integrate into existing battery technologies.
Implementation Method 1
a first delithiation capacity of the positive electrode lithium supplementing material is greater than or equal to about 300 mAh/g
Data Source
AI summary
A positive electrode lithium supplementing material includes at least one of Li2M1O2, Li2M2O3, Li5FexM31-xO4, or Li6MnyM41-yO4, where M1 contains at least one of Ni, Mn, Cu, Fe, Cr, or Mo; M2 contains at least one of Ni, Mn, Fe, Mo, Zr, Si, Cu, Cr, or Ru; M3 contains at least one of Al, Nb, Co, Mn, Ni, Mo, Ru, or Cr; and M4 contains at least one of Ni, Fe, Cu, or Ru; where 0≤x≤1 and 0≤y≤1.