A4Nb6O17 Anode Material for Battery Safety
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Solution Overview
Problem
The low average action potential of existing anode active materials in lithium and sodium ion batteries leads to easy precipitation of metal ions, compromising battery safety.
Innovation Solution
An anode active material with an A4Nb6O17 phase, where A is at least one of H, Na, or K, is used, which operates at a higher electric potential, reducing metal precipitation and enhancing safety.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If carbon material or hard carbon is used as anode active material, then energy density is improved, but metal Li or Na is easily precipitated leading to safety issues
Solution Approach 1:
The invention changes the electrochemical potential parameter of the anode active material from low potential (carbon material ~0.3V, hard carbon ~0V) to high potential (A4Nb6O17 phase ~0.7-1.0V). This parameter change prevents metal precipitation while maintaining energy density, as the higher potential keeps Li or Na ions dissolved in the electrolyte rather than precipitating as metal.
Solution Approach 2:
The invention uses a composite material approach by selecting A4Nb6O17 phase (where A is H, Na, or K) as the anode active material. This specific compound combines the advantages of high electrochemical potential with good ion insertion/extraction properties, resolving the contradiction between energy density and safety.
2Ease of operation
If low action potential anode material is used, then ion insertion/extraction is easy, but metal precipitation occurs on the anode surface
Solution Approach 1:
The invention changes the electrochemical potential parameter from low to high (0.7-1.0V range). This parameter change fundamentally alters the behavior at the anode surface, preventing metal precipitation while maintaining ease of ion insertion and extraction through the A4Nb6O17 phase structure.
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 A4Nb6O17 phase-based anode active material improves battery safety by maintaining a moderate electric potential, preventing metal precipitation and increasing heat resistance, thus enhancing the overall safety and performance of lithium and sodium ion batteries.
Implementation Method 1
the A4Nb6O17 phase acts at comparatively high electric potential, so that an improvement in safety of the battery may be intended
Data Source
AI summary
The present invention aims to provide an anode active material which may intend to improve safety of a battery. The object is attained by providing an anode active material being used for a sodium ion battery or a lithium ion battery, wherein the anode active material has an A4Nb6O17 phase (A is at least one kind of H, Na and K).