Nickel Cobalt Molybdenum Oxide Anode for Stable Sodium-Ion Cycling
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Solution Overview
Problem
Current anode electrode materials for sodium secondary batteries face challenges in achieving long-life and high-rate capability due to issues such as unsatisfactory intercalation/deintercalation reactions, volume expansion, and environmental concerns associated with lithium-ion batteries, which are not effectively addressed by existing materials like graphite, silicon, tin, and transition metal oxides.
Innovation Solution
A novel anode electrode material composed of nickel cobalt molybdenum oxide (NixCo1-xMoO4) synthesized via a one-pot hydrothermal process, which allows for stable intercalation/deintercalation reactions without significant volume change, maintaining structural integrity during charge/discharge cycles, thereby reducing electrode damage and enhancing electrochemical performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If graphite is used as anode electrode material for lithium secondary battery, then intercalation/deintercalation reaction is efficient, but it hardly occurs in sodium secondary battery due to ionic radius mismatch
Solution Approach 1:
The patent changes the crystal structure parameter of the anode material from graphite to layered transition metal oxide structure, which has larger interlayer spacing suitable for sodium ion insertion. This structural parameter change enables effective intercalation/deintercalation reactions for sodium ions while maintaining layered architecture benefits.
Solution Approach 2:
The patent introduces nickel and cobalt dopants at specific lattice positions within the layered oxide structure, creating local structural variations that enhance sodium ion diffusion pathways and improve electrochemical performance specifically for sodium storage applications.
2Quantity of substance
If transition metal oxide is used for conversion reaction, then theoretical capacity is high, but life characteristics and high-rate capability are unsatisfactory due to bond breaking and formation
Solution Approach 1:
Instead of using conversion reaction mechanism that breaks and reforms bonds, the patent adopts intercalation reaction mechanism where sodium ions reversibly insert into and extract from layered structure without breaking the host lattice bonds, thereby improving cycle life and rate capability while maintaining high capacity.
Solution Approach 2:
The patent creates a composite layered structure combining transition metal oxides with conductive additives and electrolyte components, forming a stable interface that enhances both capacity utilization and structural stability during cycling.
3Ease of operation
If alloy materials like silicon or tin are used, then electrochemical reactivity is improved, but volume expansion causes decreased performance
Solution Approach 1:
The patent employs a layered oxide structure with flexible interlayer spacing that can accommodate volume changes during sodium ion insertion/extraction, preventing structural collapse and maintaining stable composition throughout cycling while preserving high electrochemical reactivity.
4Productivity
If lithium secondary battery technology is applied to sodium secondary battery, then development speed is fast, but performance is limited due to ionic radius and mass differences
Solution Approach 1:
The patent systematically adjusts key parameters including crystal structure type, interlayer spacing, cation composition ratio, and particle morphology to optimize for sodium ion characteristics (larger radius and mass), thereby achieving high performance while maintaining rapid development through systematic parameter optimization rather than trial-and-error.
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 nickel cobalt molybdenum oxide anode electrode material exhibits improved electrochemical characteristics, including extended life and high-rate capability, with reduced risk of electrode damage and electric short circuits, while being synthesized through a simple and cost-effective hydrothermal process.
Implementation Method 1
allows intercalation/deintercalation reaction of sodium ion during charge/discharge and does not undergo significant volume change during the intercalation reaction because structure is maintained stably during repeated charge/discharge
Data Source
AI summary
The present disclosure relates to an anode electrode active material for a secondary battery containing nickel cobalt molybdenum oxide, an anode electrode for a secondary battery including the same, a secondary battery including the anode electrode for a secondary battery, and a method for manufacturing the same. The novel anode electrode material for a sodium secondary battery containing nickel cobalt molybdenum oxide according to the present disclosure allows intercalation/deintercalation reaction of sodium ion during charge/discharge and does not undergo significant volume change during the intercalation reaction because structure is maintained stably during repeated charge/discharge. As a result, electrode damage and electric short circuit are decreased and, thus, improved electrochemical characteristics can be achieved in long-life and high-rate capability.