Branched Polymer Electrolyte for High-Voltage Solid-State Batteries
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Solution Overview
Problem
Existing solid-state and gel batteries face challenges in safety and electrical conductivity, particularly with polyethylene oxide electrolytes exhibiting low electrical conductivity and poor high-voltage withstand performance.
Innovation Solution
Development of a polymer with a branched chain structure, such as polyether borate, aluminate, or phosphate, which forms a solid-state or gel electrolyte, enhancing ion conductivity and mechanical properties, and introducing polyether borate, aluminate, or phosphate to broaden the electrochemical window for high-voltage systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If polyethylene oxide electrolyte is used in solid-state and gel batteries, then the battery structure is simple and easy to manufacture, but the electrical conductivity is low and high-voltage withstand performance is poor
Solution Approach 1:
The patent uses composite materials by combining polyethylene oxide with polyether borate, aluminate, or phosphate chain segments to create a polymer electrolyte that achieves both high electrical conductivity and excellent high-voltage withstand performance while maintaining structural simplicity
Solution Approach 2:
The patent changes the chemical structure parameters of the polymer electrolyte by introducing specific chain segments (borate, aluminate, or phosphate) with defined molecular weights and structures, thereby improving electrical conductivity and voltage withstand performance without significantly increasing manufacturing complexity
2Reliability
If polymer electrolyte with improved electrical conductivity is used, then ion transmission performance improves, but internal resistance and cycle performance were previously poor
Solution Approach 1:
The patent creates a composite polymer electrolyte structure that simultaneously improves ion transmission performance and cycle performance by incorporating functional chain segments that provide both high conductivity and structural stability for long-term operation
Solution Approach 2:
The patent applies local quality by introducing specific functional chain segments (borate, aluminate, or phosphate) at specific positions in the polymer structure to locally enhance ion transmission while the overall structure maintains stability for improved cycle performance
3Quantity of substance
If high energy density batteries are developed, then energy storage capacity increases, but safety and mechanical performance need improvement
Solution Approach 1:
The patent uses composite polymer structures with borate, aluminate, or phosphate chain segments that provide both high energy density capability and enhanced mechanical strength for safety in solid-state and gel batteries
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 electrolytes improve ion transmission, reduce internal resistance, enhance cycle performance, and support higher energy density batteries with better mechanical and anti-oxidation properties.
Implementation Method 1
The electrolyte including the polymer in this disclosure has a higher electrical conductivity, and may effectively improve transmission performance of ions
Data Source
AI summary
Disclosed are a polymer, a solid-state electrolyte including the polymer, a gel electrolyte, and a battery. The polymer includes a repeating unit A. The repeating unit A has a structure represented by Formula 1. In Formula 1, R1 is selected from H or C1-6 alkyl; R2 is a linking group; R3 is an end-capping group; M is selected from a borate chain segment, an aluminate chain segment, or a phosphate chain segment; and * denotes a linking end. The solid-state electrolyte including the polymer in the present disclosure or the battery including the gel electrolyte has a lower internal resistance, better transmission performance of ions, better cycle performance, a broader electrochemical window, and higher electrochemical stability.