Sodium Ion Battery Electrode Composite Material
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Solution Overview
Problem
Existing all-solid-state sodium batteries face challenges in achieving high sodium ion conductivity and forming a dense composite material as an electrode, which limits their power and lifespan.
Innovation Solution
A composite material for sodium ion batteries comprising an active material crystal, a sodium-ion conductive crystal, and an amorphous phase, where the active material crystal contains transition metals and phosphates, and the sodium-ion conductive crystal includes alumina or zirconia, with the amorphous phase enhancing interface conductivity and bonding strength.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If general firing is used in the production process, then the manufacturing process is simple, but a dense composite material as an electrode cannot be formed
Solution Approach 1:
The patent changes the firing temperature parameter to 900°C or higher, which is significantly higher than general firing temperatures. This parameter change enables the formation of a dense composite material structure while maintaining the simplicity of the firing process, thus resolving the contradiction between manufacturing simplicity and material density.
Solution Approach 2:
The patent uses a composite material system consisting of sodium ion conductive crystals (such as NASICON-type Na1+xZr1-yAlx-ySi2-yO12) combined with active materials. This composite structure achieves high density and excellent sodium ion conductivity through the synergistic effect of different materials, resolving the density formation issue while keeping the process simple.
2Power
If the electrode structure is made dense to achieve high power, then sodium ion conductivity is improved, but the manufacturing complexity increases
Solution Approach 1:
By setting the firing temperature to 900°C or higher, the patent achieves dense electrode structure formation in a single step. This parameter change eliminates the need for multiple complex manufacturing steps to achieve density, thus improving battery power while avoiding increased manufacturing complexity.
Solution Approach 2:
The patent performs preliminary mixing of raw materials with precise composition ratios before firing. This preliminary action ensures that the high-temperature firing process produces a uniformly dense structure with excellent sodium ion conductivity, achieving high power without requiring complex subsequent processing steps.
3Quantity of substance
If sodium ion conductivity is increased to achieve high capacity, then battery performance is improved, but the manufacturing process becomes more complex
Solution Approach 1:
The patent employs a composite material system where sodium ion conductive crystals (NASICON-type) are integrated with active materials. This composite structure provides inherent high sodium ion conductivity through the crystal lattice structure, achieving high capacity without requiring complex doping or multi-step manufacturing processes.
Solution Approach 2:
The patent optimizes the composition parameters of the sodium ion conductive crystal, specifically using Na1+xZr1-yAlx-ySi2-yO12 with controlled x and y values. This parameter optimization achieves maximum sodium ion conductivity while maintaining a straightforward single-step firing manufacturing process.
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 composite material achieves improved sodium ion conductivity, increased charge-discharge capacity, and enhanced battery voltage, leading to higher power and longer lifespan for all-solid-state sodium batteries.
Implementation Method 1
a amorphous phase... enhancing interface conductivity
Implementation Method 2
a dense composite material as an electrode was not able to be formed through general firing
Data Source
AI summary
A composite material as an electrode for a sodium ion secondary battery includes an active material crystal, a sodium-ion conductive crystal, and an amorphous phase. The active material crystal may contain Na, M (where M represents at least one kind of transition metal element selected from Cr, Fe, Mn, Co, and Ni), P, and O.