Cobalt-Free Alkali-Ion Cathode Composition for Ultra-High Voltage
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Solution Overview
Problem
Conventional battery electrodes are costly, complex, and inefficient, limiting battery lifetime and energy density, particularly due to the use of expensive and toxic cobalt in high-energy cathodes, which hinders the mass production of electric vehicles.
Innovation Solution
Development of an ultra-high voltage cobalt-free cathode for alkali ion batteries using a lithium manganese nickel antimony oxide structure, fabricated through a process involving precursor mixing, ball-milling, sintering, and coating, allowing operation at voltages above 4.5 V with increased energy density and reduced cost.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If conventional cobalt-based high-energy cathodes are used, then battery energy density is improved, but production cost increases and battery lifetime is limited
Solution Approach 1:
The patent removes cobalt from the cathode material composition entirely, extracting the problematic and expensive element while maintaining the layered oxide structure with lithium, nickel, manganese, and antimony to achieve high energy density without cobalt-based costs
Solution Approach 2:
The patent creates a composite cathode material (LiNi1-x-yMnxSbyO2) combining multiple elements in specific ratios, where nickel provides high capacity, manganese provides structural stability, and antimony enhances voltage stability, achieving cost-effective high energy density
2Use of energy by moving object
If conventional cobalt-based high-energy cathodes are used, then battery energy density is improved, but battery lifetime is limited
Solution Approach 1:
The patent optimizes the local composition at different sites within the cathode structure by controlling the ratios of nickel, manganese, and antimony, creating regions with tailored properties that collectively enhance both energy density and cycling stability
Solution Approach 2:
The multi-element composite structure provides synergistic effects where nickel delivers high capacity, manganese ensures structural integrity during cycling, and antimony stabilizes the voltage profile, together achieving extended battery lifetime with high energy density
3Ease of manufacture
If cobalt-free cathode materials are developed, then production cost is reduced, but achieving ultra-high voltage operation becomes more difficult
Solution Approach 1:
The patent systematically varies the compositional parameters (x, y values in LiNi1-x-yMnxSbyO2) and sintering conditions to optimize the material for ultra-high voltage operation, demonstrating that parameter optimization can achieve high performance without cobalt
Solution Approach 2:
The composite cathode material combines elements with complementary properties that naturally stabilize the structure at ultra-high voltages, where antimony and manganese work synergistically to maintain structural integrity and voltage stability without requiring complex multi-step fabrication processes
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.