Nitrogen-Doped Lithium Niobate Layer for Battery Resistance Reduction
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Solution Overview
Problem
The existing techniques for forming a lithium niobate layer on the surface of active materials in all-solid-state batteries result in increased resistance due to low lithium ion conductivity, hindering the improvement of battery output characteristics.
Innovation Solution
Incorporating nitrogen into the lithium niobate layer on the surface of active material composite particles, with a nitrogen to niobium concentration ratio between 0.08 and 0.26, to reduce reaction resistance and enhance lithium ion conductivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If a lithium niobate layer is formed on the surface of active material using alkoxide solution, then the output characteristic of all-solid-state battery is expected to improve, but the resistance of battery easily increases due to small lithium ion conductivity of the layer
Solution Approach 1:
The patent applies parameter changes by modifying the chemical composition of the lithium niobate layer through nitrogen doping. Specifically, nitrogen is incorporated into the lithium niobate lattice structure, changing the stoichiometric parameters and electronic structure of the material. This compositional parameter change enables simultaneous achievement of low resistance and high lithium ion conductivity, resolving the contradiction between power output and resistance stability.
Solution Approach 2:
The patent creates a composite material system by combining lithium niobate with nitrogen dopants. The nitrogen-doped lithium niobate layer forms a new composite structure where nitrogen atoms are integrated into the crystal lattice, creating defects and pathways that enhance lithium ion transport. This composite approach allows the layer to exhibit both low electrical resistance and high ionic conductivity, overcoming the limitations of pure lithium niobate.
2Reliability
If nitrogen is added to lithium niobate layer, then the reaction resistance of battery is reduced, but the nitrogen ratio must be controlled within predetermined range to optimize performance
Solution Approach 1:
The patent utilizes parameter changes by precisely controlling the nitrogen ratio within a specific range (0.01-0.50 atomic ratio). This parameter optimization reveals a non-linear relationship where moderate nitrogen doping reduces resistance, while excessive doping degrades performance. The identified optimal range represents a critical parameter window that balances defect formation with structural stability, achieving minimum resistance without requiring complex control systems.
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
This approach significantly reduces the reaction resistance of the lithium battery, improving lithium ion conductivity and overall battery performance by forming an active material composite particle with a nitrogen-doped lithium niobate layer.
Implementation Method 1
it is possible to reduce the reaction resistance of a lithium battery, by including nitrogen into a lithium niobate layer
Data Source
AI summary
Provided is an active material composite particle with which the reaction resistance of a battery can be reduced. The active material composite particle includes an active material and a lithium niobate layer formed on a surface of the active material, wherein the lithium niobate layer includes nitrogen.