Solid-State Lithium Battery Interface for Longer Cycle Life
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
All-solid-state lithium batteries face a shorter cycle life, which limits their charging and discharging capacity compared to traditional liquid lithium batteries.
Innovation Solution
The battery comprises a solid lithium anode, a lithium lanthanum zirconium oxide solid-state electrolyte, and a joint interface region containing lithium nitride and lithium alloy, formed through a manufacturing process involving the mixing of metal nitride and lithium metal, followed by heating and in-situ reaction with lithium lanthanum zirconium oxide to create a tightly bonded Li-Ga-N/LLZTO material.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If all-solid-state lithium batteries are used to achieve high energy density and safety, then energy density and safety are improved, but cycle life becomes shorter
Solution Approach 1:
The patent applies preliminary action by pre-forming a joint interface layer containing lithium nitride and lithium alloy at the anode-electrolyte interface before battery operation. This pre-established interface structure prevents degradation during cycling, thereby extending cycle life while maintaining the high safety characteristics of solid-state batteries.
Solution Approach 2:
The patent employs composite materials by creating a joint interface region that combines lithium nitride and lithium alloy phases. This composite interface structure provides both mechanical stability and electrochemical compatibility, resolving the contradiction between maintaining solid-state safety benefits and achieving extended cycle life through improved interface durability.
2Use of energy by moving object
If all-solid-state lithium batteries are used to achieve high energy density, then energy density is improved, but cycle life becomes shorter
Solution Approach 1:
The patent applies preliminary action by pre-forming a joint interface layer containing lithium nitride and lithium alloy at the anode-electrolyte interface before battery operation. This pre-established interface structure prevents degradation during cycling, thereby extending cycle life while maintaining the high energy density characteristics of solid-state batteries.
Solution Approach 2:
The patent employs composite materials by creating a joint interface region that combines lithium nitride and lithium alloy phases. This composite interface structure provides both mechanical stability and electrochemical compatibility, resolving the contradiction between maintaining high energy density and achieving extended cycle life through improved interface durability.
3Duration of action of moving object
If a joint interface containing lithium nitride and lithium alloy is formed, then cycle life is improved, but manufacturing complexity increases
Solution Approach 1:
The patent applies merging by combining the formation of lithium nitride and lithium alloy phases into a single joint interface layer during one heating treatment step. This integrated approach creates the complex functional interface structure without requiring multiple separate manufacturing steps, thereby extending cycle life while limiting the increase in manufacturing complexity.
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 cycle life of the battery while maintaining high energy density and safety, with improved interface stability and reduced risk of lithium metal dendrite formation, enabling rapid charging and discharging with stable voltage over extended cycles.
Implementation Method 1
heating to form a molten lithium metal nitride alloy
Implementation Method 2
placing lithium lanthanum zirconium oxide as a solid-state electrolyte material of a solid-state electrolyte of the all-solid-state lithium battery on a surface of the molten lithium metal nitride alloy to undergo an in-situ reaction
Implementation Method 3
cooling the molten lithium metal nitride alloy so that a joint interface region between the molten lithium metal nitride alloy and the lithium lanthanum zirconium oxide contains lithium nitride and lithium alloy
Data Source
AI summary
Disclosed is an all-solid-state lithium battery, characterized in that an anode of the all-solid-state lithium battery comprises solid lithium metal, a solid-state electrolyte of the all-solid-state lithium battery comprises lithium lanthanum zirconium oxide, and a joint interface region between the anode and the solid-state electrolyte contains at least lithium nitride and lithium alloy.