Solid-State Battery Anode Composition With Nb2O5 for Rate and Cycle Life
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Solution Overview
Problem
Current all solid-state batteries face challenges in achieving high ionic conductivity and rate capability due to limitations in the composition and ratio of negative catalyst layers, particularly with the use of Nb2O5, which affects the reversible capacity and electrical conductivity.
Innovation Solution
Incorporating Nb2O5 in the negative catalyst layer with a specific weight percentage range (1 wt % to 30 wt %) and maintaining a capacity ratio (N/P) between the negative catalyst layer and the positive electrode of 0.1 to 0.5, along with the use of carbon-based materials and metal particles, enhances the ionic conductivity and cycle-life characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If Nb2O5 is added to the negative catalyst layer to improve ionic conductivity, then electrical conductivity increases, but irreversible capacity loss increases
Solution Approach 1:
The patent optimizes the content of Nb2O5 in the negative catalyst layer to a specific range (1-30 wt%, preferably 3-15 wt%) to achieve the desired ionic conductivity while minimizing irreversible capacity loss. This parameter optimization resolves the contradiction by finding the optimal concentration point where beneficial conductivity enhancement occurs without excessive capacity loss.
Solution Approach 2:
The patent creates a composite negative catalyst layer containing Nb2O5 combined with carbon-based materials and metal particles. This composite structure leverages the high ionic conductivity of Nb2O5 while the carbon-based materials and metal particles contribute to reducing irreversible capacity, thus resolving the contradiction through material synergism.
2Speed
If the capacity ratio (N/P) of the negative catalyst layer to the positive electrode is increased to improve rate capability, then charging/discharging speed increases, but cycle-life characteristics deteriorate
Solution Approach 1:
The patent optimizes the capacity ratio (N/P) of the negative catalyst layer to the positive electrode within a specific range (0.1 to 0.5) to achieve a balance between rate capability and cycle-life. This parameter optimization resolves the contradiction by identifying the optimal ratio where fast charging/discharging is enabled without excessive degradation over cycles.
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 optimized composition and ratio of the negative catalyst layer improve the electrical conductivity, reduce irreversible capacity, and enhance the cycle-life characteristics of the all solid-state battery, leading to improved charging and discharging efficiency.
Implementation Method 1
the active material that is capable of reversibly intercalating and deintercalating lithium ions
Implementation Method 2
the solid electrolyte may serve as a passage for the movement of lithium ions during charge and discharge
Implementation Method 3
The negative catalyst may be a carbon-based material, metal particles, or combinations thereof
Data Source
AI summary
Disclosed is an all solid-state battery, and the all solid-state battery including a positive electrode including a positive active material layer including a positive active material, a negative catalyst layer including a negative catalyst and Nb2O5; and an electrolyte, wherein an amount of Nb2O5 is about 1 wt % to about 30 wt % of the total, 100 wt % of the negative catalyst layer, and a ratio (N/P) of a capacity of the negative catalyst layer relative to a capacity of the positive electrode is about 0.1 or more and less than 0.5.