Sintered Solid-State Battery with Ag Anode for Higher Energy Density
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Solution Overview
Problem
There is a desire to increase the energy density of all-solid-state batteries to reduce their size and weight.
Innovation Solution
The all-solid-state battery design includes a sintered body with a positive electrode, a negative electrode, and a solid electrolyte layer. The negative electrode contains pure Ag or a Ag alloy, along with compounds like LiαTiO3 and LiβTiSiO5, and the solid electrolyte has a γ-Li3PO4-type crystal structure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of stationary object
If thin film technique is used to produce all-solid-state batteries, then the size and weight can be reduced, but the manufacturing complexity increases and material selection is limited
Solution Approach 1:
The patent changes the manufacturing approach from thin film techniques to sintering process, altering the key parameter of production method. This enables the use of bulk-type construction with sintered bodies, which simplifies manufacturing while allowing greater material selection flexibility, including oxide-based solid electrolytes that require sintering temperatures
Solution Approach 2:
The sintering method provides multi-functionality by enabling both size reduction and material versatility. The process can accommodate various oxide-based solid electrolyte materials that require high-temperature processing, while still producing compact battery structures suitable for weight-sensitive applications
2Adaptability or versatility
If sintering method is used to produce bulk-type all-solid-state batteries, then material selection flexibility increases, but the battery size and weight increase
Solution Approach 1:
The patent optimizes the sintering process parameters including temperature, time, and atmosphere to produce dense sintered bodies with minimized volume. By controlling these parameters, the battery achieves compact size and reduced weight while maintaining the ability to use various oxide-based solid electrolyte materials that require sintering
3Quantity of substance
If layer thickness is increased to improve battery capacity, then the energy density increases, but the battery size increases
Solution Approach 1:
The patent changes the fundamental approach from increasing layer thickness to increasing material density through optimized sintering. By producing highly dense sintered bodies with minimized porosity, the battery achieves higher capacity within a compact volume, effectively increasing energy density rather than simply scaling up size
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 design effectively increases the energy density of the all-solid-state battery, enhancing its performance and capacity.
Implementation Method 1
a solid electrolyte layer disposed between the positive electrode and the negative electrode. The solid electrolyte layer contains a solid electrolyte having a γ-Li3PO4-type crystal structure
Implementation Method 2
Bulk-type all-solid-state batteries are produced using a powder forming method, a sintering method or the like
Data Source
AI summary
An all-solid-state battery according to the present embodiment includes a sintered body having a positive electrode, a negative electrode and a solid electrolyte layer disposed between the positive electrode and the negative electrode, the solid electrolyte layer contains a solid electrolyte having a γ-Li3PO4-type crystal structure, and the negative electrode contains pure Ag or a Ag alloy and at least one compound of LiαTiO3 (2≤α≤2.8) and LiβTiSiO5 (2≤β≤4).