All-solid-state Battery Manufacturing via Deactivated Lithium Layer
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
All-solid-state batteries experience irreversible capacity loss due to gaps between the negative electrode active material and the solid electrolyte caused by expansion and shrinkage, as well as lithium ions reacting with the negative electrode material, reducing the total amount of lithium ions available for charging and discharging.
Innovation Solution
A method of manufacturing all-solid-state batteries involves laminating a deactivated lithium-containing negative electrode active material layer, a solid electrolyte layer, and a positive electrode active material layer, with the solid electrolyte layer disposed between them, and includes steps of charging a temporary battery to produce deactivated lithium, removing the positive electrode active material layer, and reusing it to form a new battery, thereby reducing irreversible capacity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of moving object
If the all-solid-state battery is charged and discharged, then the battery operates and provides energy, but gaps are generated between the negative electrode active material and the solid electrolyte due to expansion and shrinkage, causing irreversible capacity loss
Solution Approach 1:
The patent applies preliminary action by performing a formation charging process before the battery is put into service. During this formation charging, lithium ions are intentionally allowed to react with the negative electrode active material to create a deactivated lithium-containing layer. This preliminary chemical modification prevents subsequent harmful reactions during normal charging-discharging cycles, thereby reducing irreversible capacity loss while maintaining cycle durability.
2Use of energy by moving object
If lithium ions react with the negative electrode active material during charging, then the battery charges, but some lithium ions are deactivated and the total amount of lithium ions available for subsequent charging and discharging is reduced
Solution Approach 1:
The patent applies local quality by creating a specialized deactivated lithium-containing negative electrode active material layer with distinct chemical properties. This layer has a different composition and reactivity compared to the bulk negative electrode material. The localized deactivated region serves as a buffer that prevents excessive lithium ion reactions during charging, thereby reducing irreversible capacity loss while preserving the overall charge capacity of the battery.
3Productivity
If the negative electrode active material expands and shrinks during charging and discharging, then the battery undergoes normal electrochemical reactions, but gaps are generated between the negative electrode active material and the solid electrolyte, reducing contact and increasing resistance
Solution Approach 1:
The patent applies preliminary action by creating a deactivated lithium-containing layer during formation charging before the battery enters normal operation. This pre-formed layer acts as a stable interface between the negative electrode active material and the solid electrolyte, maintaining consistent contact during subsequent expansion and shrinkage cycles, thereby preserving both charge-discharge rate and interfacial contact stability.
Solution Approach 2:
The patent applies parameter changes by modifying the chemical state of the negative electrode active material through formation charging. The lithium ion insertion during formation charging changes the physical and chemical parameters of the negative electrode material, creating a stabilized structure with reduced volume change during subsequent cycling. This parameter change improves both charge-discharge rate and interfacial contact stability.
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 method effectively reduces irreversible capacity loss by managing lithium ion deactivation and improving the interfacial contact between electrode layers, enhancing the battery's charge-discharge efficiency.
Implementation Method 1
a solid electrolyte layer for supplying lithium to the negative electrode active material
Implementation Method 2
a deactivated lithium-containing negative electrode active material layer containing deactivated lithium
Data Source
AI summary
A method of manufacturing an all-solid-state battery includes a lamination step of laminating a deactivated lithium-containing negative electrode active material layer containing deactivated lithium, a solid electrolyte layer for the all-solid-state battery, and a positive electrode active material layer for the all-solid-state battery such that the solid electrolyte layer for the all-solid-state battery is disposed between the deactivated lithium-containing negative electrode active material layer and the positive electrode active material layer for the all-solid-state battery.