Cobalt-Free Alkali-Ion Cathode Composition for High-Voltage Stability
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Solution Overview
Problem
Conventional battery electrodes are costly, complex, and inefficient, limiting battery lifetime and hindering the widespread adoption of electric vehicles due to high cobalt content and performance degradation at high voltages.
Innovation Solution
Development of an ultra-high voltage cobalt-free cathode for alkali ion batteries using a lithium manganese nickel antimony oxide structure, which operates at voltages above 4.5 V, incorporating excess lithium and varying ratios of manganese and nickel, fabricated through a process involving ball-milling and sintering of precursors, resulting in increased energy density and reduced production costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If conventional cobalt-based cathode materials are used, then battery capacity and energy density are improved, but manufacturing cost increases and resource availability decreases
Solution Approach 1:
The patent removes cobalt from the cathode material composition entirely, extracting the problematic element that drives up cost and resource concerns. The cathode uses lithium, nickel, manganese, and oxygen in a layered structure without cobalt, directly addressing the cost and availability issues while maintaining functional performance.
Solution Approach 2:
The patent modifies the chemical composition parameters of the cathode material by changing the stoichiometric ratios of lithium, nickel, and manganese. Specifically, it uses excess lithium (greater than stoichiometric amount) and controls the nickel-to-manganese ratio to optimize both capacity and stability, achieving high performance without cobalt.
2Use of energy by moving object
If operating voltage is increased above 4.5V, then energy density is improved, but electrode stability and battery lifetime deteriorate
Solution Approach 1:
The patent changes the chemical composition parameters to enable high-voltage operation. By using excess lithium and specific nickel-manganese ratios, the cathode maintains structural stability at voltages above 4.5V versus lithium, preventing the degradation that normally occurs at such high potentials.
Solution Approach 2:
The patent creates a composite cathode material combining lithium, nickel, manganese, and oxygen in a specific layered structure. This composite approach leverages the complementary properties of each element: lithium provides capacity, nickel enhances voltage, manganese improves stability, and the layered structure maintains integrity at high voltages.
3Ease of manufacture
If cobalt-free materials are used, then manufacturing cost and resource availability are improved, but achieving high voltage performance becomes more difficult
Solution Approach 1:
The patent adjusts the compositional parameters to achieve high voltage without cobalt. By using excess lithium (greater than stoichiometric) and optimizing the nickel-to-manganese ratio, the cathode reaches operating voltages above 4.5V, matching or exceeding traditional cobalt-based materials while reducing cost.
Solution Approach 2:
The patent applies local quality by creating a layered structure where different elements occupy specific positions: lithium and nickel in one layer for high capacity and voltage, manganese in another layer for stability. This spatial arrangement allows each element to contribute its optimal properties to the overall 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 cobalt-free cathode achieves higher energy density, extended operating voltage range, increased capacity, and reduced costs, with improved cycle efficiency and material stability, enhancing the performance and safety of lithium-ion batteries.
Implementation Method 1
fabricated through a process involving ball-milling and sintering of precursors
Implementation Method 2
fabricated through a process involving ball-milling and sintering of precursors
Implementation Method 3
ultra-high voltage cobalt-free cathode for alkali ion batteries
Data Source
AI summary
Systems and methods for an ultra-high voltage cobalt-free cathode for alkali ion batteries may include an anode, a cathode, and a separator, with the cathode comprising an active material ANi(1-x)MnxSbOy, where x is a number between 0.0 and 1.0, y is an integer, and A comprises one or more of lithium, sodium, and potassium. The anode may include one or more of an alkali metal, silicon, and carbon. In one example, x is a value in the range between 0.05 and 0.9 and y is a value in the range between 1 and 8 where a specific capacity of the active material is greater than 50 milliamp-hours per gram. In another example, x is a value in the range between 0.4 and 0.6 and y is a value in the range between 1 and 8, where a specific capacity of the active material is greater than 70 milliamp-hours per gram.