Solid State Electrolyte Composite for Battery Safety
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Solution Overview
Problem
Conventional liquid electrolyte lithium ion batteries face high energy storage costs due to low gravimetric energy density and limited cycle times, and increasing energy density can lead to safety issues such as leakage, swelling, and explosion, limiting their suitable applications.
Innovation Solution
A novel electrolyte comprising 100 parts of oxide-based solid state inorganic electrolyte, 20 to 70 parts of [Li(—OR1)n−OR2]Y, 1 to 10 parts of nano oxide, and 1 to 20 parts of binder, forming a quasi or solid state film-like composite electrolyte, which can be modified with a hyper-branched polymer to enhance ionic conductivity and mechanical strength.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If liquid electrolyte is used to achieve high ionic conductivity, then battery performance is improved, but safety issues such as leakage, swelling, and explosion occur
Solution Approach 1:
The patent changes the physical state of the electrolyte from liquid to solid by using oxide-based solid state inorganic electrolyte. This fundamental parameter change eliminates the safety issues associated with liquid electrolytes (leakage, swelling, explosion) while maintaining high ionic conductivity through the solid state material's intrinsic properties
Solution Approach 2:
The patent creates a composite electrolyte system by combining oxide-based solid state inorganic electrolyte with polymer components. This composite approach allows the solid state inorganic electrolyte to provide safety and ionic conductivity, while the polymer matrix provides mechanical flexibility and structural stability
2Weight of moving object
If energy density is increased to reduce cost, then gravimetric energy density is improved, but safety problems are induced
Solution Approach 1:
The patent changes the electrolyte from liquid to solid state, which fundamentally alters the safety profile. The solid state inorganic electrolyte enables higher energy density configurations without the safety risks, as it cannot leak or explode like liquid electrolytes, thus allowing energy density to be increased without inducing safety problems
3Object-affected harmful factors
If oxide-based solid state inorganic electrolyte is used to improve safety, then safety is improved, but ionic conductivity and mechanical strength need enhancement
Solution Approach 1:
The patent forms a composite electrolyte by combining oxide-based solid state inorganic electrolyte particles with a polymer matrix. The inorganic electrolyte provides safety and ionic conductivity, while the polymer provides mechanical strength and flexibility. This composite structure synergistically addresses all three requirements
Solution Approach 2:
The patent creates a heterogeneous structure where the solid state inorganic electrolyte particles are distributed within the polymer matrix. Each component performs its specialized function: the inorganic particles provide local high ionic conductivity pathways and safety, while the polymer matrix provides continuous mechanical support throughout the electrolyte structure
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 electrolyte achieves a balance of energy, lifespan, and safety by improving ionic conductivity and mechanical strength, reducing internal micro-shorts, and maintaining stable discharge curves and high coulombic efficiency over repeated charge/discharge cycles.
Implementation Method 1
100 parts by weight of oxide-based solid state inorganic electrolyte
Implementation Method 2
1 to 10 parts by weight of nano oxide
Data Source
AI summary
An electrolyte is provided, which includes (a) 100 parts by weight of oxide-based solid state inorganic electrolyte, (b) 20 to 70 parts by weight of [Li(—OR1)n−OR2]Y, wherein R1 is C1-4 alkylene group, R2 is C1-4 alkyl group, n is 2 to 100, and Y is PF6−, BF4−, AsF6−, SbF6−, ClO4−, AlCl4−, GaCl4−, NO3−, C(SO2CF3)3−, N(SO2CF3)2−, SCN−, CF3CF2SO3−, C6F5SO3−, CF3CO2−, SO3F−, B(C6H5)4−, CF3SO3−, or a combination thereof, (c) 1 to 10 parts by weight of nano oxide, and (d) 1 to 20 parts by weight of binder. The electrolyte can be disposed between a positive electrode and a negative electrode to form a battery.