NMC-Spinel Composite Electrode for High-Capacity Battery Safety
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Lithium ion batteries used in large-scale energy storage systems require increased capacity to reduce the number of batteries and cell controllers needed, while ensuring safety and responsiveness to rapid load fluctuations, as existing solutions face challenges in scaling without compromising safety and performance.
Innovation Solution
A lithium ion battery design utilizing a positive electrode composite made of layered lithium nickel manganese cobalt composite oxide (NMC) and spinel lithium manganese oxide (sp-Mn) with specific density, application quantity, and porosity ranges, along with a optimized electrolyte and separator, to achieve high-input, high-output capabilities and enhanced safety.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the battery capacity is increased to reduce the number of batteries needed for large-scale energy storage systems, then the system cost and complexity are reduced, but the safety and responsiveness to rapid load fluctuations may be compromised
Solution Approach 1:
The patent applies composite materials by combining layered lithium nickel manganese cobalt composite oxide (NMC) and spinel lithium manganese oxide (sp-Mn) in a specific weight ratio range (40:60 to 90:10) to create a positive electrode composite that achieves both high capacity and high safety. This composite structure leverages the high capacity characteristics of NMC and the high safety and structural stability of sp-Mn, resolving the contradiction between increasing battery capacity and maintaining safety reliability.
Solution Approach 2:
The patent employs parameter changes by optimizing specific parameters including the weight ratio of NMC to sp-Mn (40:60 to 90:10), positive electrode composite density (2.2 to 2.6 g/cm³), and porosity (30% to 45%). These parameter optimizations enable the battery to achieve discharge capacity of 30 Ah or more while maintaining high safety standards and responsiveness to rapid load fluctuations.
2Quantity of substance
If the battery capacity is increased to reduce the number of cell controllers needed, then the system complexity and cost are reduced, but the charging/discharging cycle characteristics may deteriorate
Solution Approach 1:
The composite positive electrode material combining layered NMC and spinel sp-Mn provides both high capacity and excellent charging/discharging cycle characteristics. The spinel component contributes to structural stability during cycling, while the layered NMC provides high capacity, enabling the battery to maintain good performance over extended charging/discharging cycles even at large capacity scales.
3Quantity of substance
If the battery capacity is increased to reduce the number of batteries required, then the system cost is reduced, but the preservation characteristics may worsen
Solution Approach 1:
The spinel lithium manganese oxide component in the composite provides exceptional structural stability and resistance to degradation, which significantly improves preservation characteristics. When combined with layered NMC in the specified weight ratio range, the composite maintains both high capacity and excellent long-term stability, enabling the battery to retain its performance characteristics over extended storage periods.
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 achieves a discharge capacity of 30 Ah or more, ensuring high energy density and safety, with improved charging/discharging cycle characteristics and preservation characteristics, while reducing the number of batteries and cell controllers required, thus lowering costs and enhancing system responsiveness.
Implementation Method 1
a positive electrode active material capable of insertion and desorption of lithium ions
Implementation Method 2
a negative electrode active material capable of insertion and desorption of lithium ions
Implementation Method 3
a nonaqueous electrolyte liquid in which the electrode group can be immersed
Data Source
Figure 1
Figure 2
Figure 3
AI summary
A high-input and high-output battery having a large capacity while guaranteeing safety is provided. In a lithium ion battery having an electrode wound group in which a positive electrode, a negative electrode, and a separator are wound and an electrolytic solution provided in a battery container, a discharge capacity of the battery being 30 Ah or more, the positive electrode has a current collector and a positive electrode composite applied to both surfaces of the current collector, and the positive electrode composite has following configuration. The positive electrode composite contains a mixed active material of layered lithium nickel manganese cobalt composite oxide (NMC) and spinel lithium manganese oxide (sp-Mn), a density of the positive electrode composite is 2.4 g/cm3 or more and 2.7 g/cm3 or less, and a porosity of the active electrode composite is 29.5% or more and 40.0% or less. Furthermore, a weight ratio (NMC/sp-Mn) of the mixed active materials is set to 10/90 or more and 60/40 or less.