Anode Mixture Potential Difference for All-Solid-State Battery Charging
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Solution Overview
Problem
All-solid-state batteries face poor lithium ion occlusion performance and high electrode resistance due to blocked lithium ion conducting paths and non-uniform electrode reactions, leading to inadequate quick charging capabilities.
Innovation Solution
An anode mixture comprising a first anode active material and a second anode active material with a reaction potential difference of 1.0 V or more, where the second anode active material is Li4Ti5O12, is used to promote lithium diffusion and reduce electrode resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a single anode active material is used, then the electrode structure is simple, but the lithium ion occlusion performance is poor and charging performance is insufficient
Solution Approach 1:
The patent applies composite materials by combining multiple anode active materials (graphite, SiO, and Li4Ti5O12) in specific proportions. This composite structure enables the anode to achieve both good lithium ion occlusion performance and high charging performance, resolving the contradiction between simple electrode structure and high productivity. The specific capacity ratio of graphite to (SiO + Li4Ti5O12) being 2:1 to 10:1 ensures optimal performance.
2Reliability
If lithium ion conducting paths are blocked in solid electrolyte, then the battery structure is stable, but the lithium diffusion is hindered and electrode resistance increases
Solution Approach 1:
The patent changes the chemical composition parameters of the anode active materials to resolve the contradiction. By selecting materials with appropriate reaction potentials (graphite: -0.05 to 0.20 V, SiO: -0.4 to -0.6 V, Li4Ti5O12: 1.55 to 1.65 V vs. Li/Li+) and controlling their ratios, the anode achieves both structural stability and low resistance. The specific capacity ratio control ensures optimal lithium ion diffusion while maintaining battery structure stability.
3Stability of the object's composition
If the reaction potential difference between anode materials is small, then the electrode composition is uniform, but the impetus for lithium ion movement is insufficient
Solution Approach 1:
The patent applies local quality by creating different potential zones within the anode structure. The anode contains materials with different reaction potentials (graphite at low potential, Li4Ti5O12 at high potential) distributed in specific proportions. This creates local potential differences that provide impetus for lithium ion movement while maintaining overall composition uniformity through controlled mixing ratios.
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 anode mixture enhances lithium diffusion and charging performance by providing an impetus for lithium ion movement, thereby decreasing battery resistance and improving charging efficiency in all-solid-state batteries.
Implementation Method 1
a difference between a reaction potential of the first anode active material with respect to lithium metal and a reaction potential of the second anode active material with respect to lithium metal, is 1.0 V or more
Data Source
AI summary
To provide an anode mixture configured to, when used in an all-solid-state battery, decrease the resistance of the all-solid-state battery and increase the charging performance of the all-solid-state battery, wherein the anode mixture is an anode mixture for an all-solid-state battery comprising an anode comprising an anode mixture layer; wherein the anode mixture contains a first anode active material and a second anode active material; and wherein a difference between a reaction potential of the first anode active material with respect to lithium metal and a reaction potential of the second anode active material with respect to lithium metal, is 1.0 V or more.