Co-fired All-solid-state Battery Negative Electrode Composition
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Solution Overview
Problem
All-solid-state batteries with garnet-type solid electrolytes often fail to achieve good characteristics when produced by co-firing due to undesired reactions between the negative electrode active material and the solid electrolyte.
Innovation Solution
A co-fired all-solid-state battery design featuring a negative electrode with a garnet-type solid electrolyte containing Li, La, and Zr, and a negative electrode active material with a Li/V mole ratio of 2.0 or more, which suppresses undesired reactions during co-firing, and includes a conductive auxiliary agent and sintering additive to enhance performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If co-firing method is used to produce all-solid-state battery with garnet-type solid electrolyte, then manufacturing efficiency is improved, but undesired reactions occur between negative electrode active material and solid electrolyte
Solution Approach 1:
The patent changes the chemical composition parameters of the negative electrode active material by specifying a Li/V mole ratio of 2.0 or more. This parameter change prevents undesired reactions during co-firing while maintaining manufacturing efficiency. The specific composition adjustment (Li content relative to V content) modifies the material's chemical stability during the firing process.
Solution Approach 2:
The patent uses a composite negative electrode active material containing multiple elements (Li, V, and other elements) with a controlled Li/V mole ratio. This composite material approach allows the material to exhibit both reactivity for battery function and stability during co-firing, resolving the contradiction between manufacturing efficiency and battery characteristics.
2Quantity of substance
If negative electrode active material with high Li content is used, then reversible capacitance is improved, but reaction with garnet-type solid electrolyte during co-firing increases
Solution Approach 1:
The patent precisely controls the Li/V mole ratio parameter to be 2.0 or more, which optimizes the Li content to provide high reversible capacitance while simultaneously preventing undesired reactions with the garnet-type solid electrolyte during co-firing. This parameter optimization resolves the contradiction between quantity of substance and harmful factors.
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 battery achieves excellent reversible capacitance and improved charge/discharge characteristics by maintaining the integrity of the garnet-type solid electrolyte and optimizing the negative electrode active material's structure and composition.
Implementation Method 1
a solid electrolyte layer (13)... The garnet-type solid electrolyte contains Li, La, Zr, and O
Implementation Method 2
co-fired all-solid-state battery... produced by co-firing... The positive electrode (11) and the negative electrode (12) are each joined with the solid electrolyte layer (13) by sintering
Data Source
AI summary
A co-fired all-solid-state battery that includes a negative electrode, a solid electrolyte layer, and a positive electrode. The negative electrode contains a negative electrode active material and a garnet-type solid electrolyte. The negative electrode active material contains Li, V, and O. The negative electrode active material has a mole ratio (Li/V) of a Li content to a V content of 2.0 or more. The garnet-type solid electrolyte contains Li, La, Zr, and O.