Solid-State Battery Electrode Composition for Higher Energy Density
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Solution Overview
Problem
Existing all-solid-state batteries have limitations in achieving high energy density.
Innovation Solution
The all-solid-state battery design incorporates a negative electrode active material layer with 60% or more volume of oxide having a LISICON-type crystal structure, and a solid electrolyte layer containing an oxide with either a garnet-type or LISICON-type crystal structure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional solid electrolyte materials are used in all-solid-state batteries, then reliability and safety are improved, but energy density remains limited
Solution Approach 1:
The invention changes the crystal structure parameter of the solid electrolyte from conventional structures to LISICON-type structure, which enables simultaneous achievement of high ionic conductivity (10^-3 to 10^-1 S/cm) and high energy density through optimized lithium ion transport pathways in the crystal lattice
Solution Approach 2:
The invention creates a composite electrode structure where the negative electrode active material layer contains 60% or more by volume of LISICON-type oxide, combining the electrolyte function and energy storage function in a single composite material system to maximize energy density
2Quantity of substance
If the content of LISICON-type oxide in negative electrode active material layer is increased to 60% or more by volume, then energy density is improved, but manufacturing precision requirements increase
Solution Approach 1:
The invention merges the electrolyte function and negative electrode active material function into a single integrated layer, eliminating the need for separate electrolyte layer and electrode layer assembly, thereby simplifying manufacturing and reducing precision requirements for volume fraction control
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 configuration enhances the energy density of the battery by increasing the content of the LISICON-type oxide as a negative electrode active material and improving charge mobility through the use of garnet-type or LISICON-type solid electrolytes.
Implementation Method 1
The negative electrode active material layer contains 60% by volume or more of an oxide having a LISICON-type crystal structure
Implementation Method 2
The solid electrolyte layer contains a solid electrolyte having at least one of an oxide having a garnet-type crystal structure or an oxide having a LISICON-type crystal structure
Data Source
AI summary
An all-solid-state battery having a positive electrode, a negative electrode having a negative electrode active material layer, and a solid electrolyte layer between the positive electrode and the negative electrode material layer. The negative electrode active material layer contains 60% by volume or more of an oxide having a LISICON-type crystal structure. The solid electrolyte layer contains a solid electrolyte having at least one of an oxide having a garnet-type crystal structure or an oxide having a LISICON-type crystal structure.