Polymer Solid Electrolyte with Anatase Titanium Oxide
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Solution Overview
Problem
Lithium ion secondary batteries face issues with safety due to the risk of leakage and dendrite formation, which can lead to shorting and thermal runaway, and existing solid electrolytes have low ion conductivity at ordinary temperatures, making them unsuitable for high-temperature applications.
Innovation Solution
A polymer solid electrolyte composed of anatase-type titanium oxide, a lithium electrolyte salt, and an ion conductive polymer, such as polyvinylidene fluoride, which enhances ion conductivity and mechanical strength, preventing shorting and dendrite growth even at high temperatures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If gel electrolyte or organic solid electrolyte is used, then ion conductivity is improved, but safety deteriorates due to fire risk and dendrite formation
Solution Approach 1:
The patent uses a composite material consisting of polyvinylidene fluoride polymer matrix combined with lithium electrolyte salt and inorganic filler particles. This composite structure provides both high ion conductivity through the polymer-electrolyte complex and enhanced safety by eliminating flammable organic solvents while suppressing dendrite growth through the inorganic filler network
Solution Approach 2:
The patent changes the physical and chemical parameters of the electrolyte system by using a solid polymer electrolyte with specific glass transition temperature and crystallinity characteristics. The lithium electrolyte salt concentration and molecular weight of the polymer are optimized to achieve the desired balance between ion conductivity and mechanical strength for dendrite suppression
2Reliability
If thin layer thickness is used to improve ion conductivity, then ion transport is enhanced, but mechanical strength deteriorates causing rupture and shorting
Solution Approach 1:
The patent incorporates inorganic filler particles (such as alumina, silica, or titania) into the polymer electrolyte matrix to create a composite structure. These particles form a rigid network that provides mechanical strength and dimensional stability to thin electrolyte layers, preventing rupture while maintaining continuous ion conduction pathways through the polymer phase
Solution Approach 2:
The patent creates local regions with different properties: the polymer matrix provides ion conductivity while the inorganic filler particles provide mechanical reinforcement. This local differentiation of functions allows the thin electrolyte layer to simultaneously achieve high ion conductivity and sufficient mechanical strength
3Object-affected harmful factors
If ordinary temperature operation is required, then safety is improved, but ion conductivity deteriorates
Solution Approach 1:
The patent selects polymer electrolytes with appropriate glass transition temperatures and crystallinity levels to maintain flexibility and ion mobility at ordinary temperatures. The lithium salt type and concentration are optimized to ensure sufficient ion conductivity without requiring elevated temperatures, while the solid state provides inherent safety compared to liquid electrolytes
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 polymer solid electrolyte achieves significant improvements in ion conductivity and mechanical strength, ensuring safety and performance in high-temperature environments, preventing shorting and maintaining durability even as a thin layer.
Implementation Method 1
an ion conductive polymer that binds the anatase-type titanium oxide
Implementation Method 2
a polymer solid electrolyte in which a lithium electrolyte salt-containing ion conductive polymer binds anatase-type titanium oxide
Data Source
AI summary
A polymer solid electrolyte is provided that includes anatase-type titanium oxide, a lithium electrolyte salt, and an ion conductive polymer that binds the titanium oxide.