Siloxane Nitrile Electrolyte for High-Temperature Gas Reduction
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Solution Overview
Problem
Current lithium-ion batteries face challenges with high-temperature storage gas production, which affects their cycle performance and storage performance, necessitating an improvement in electrolyte composition to reduce gas production and enhance thermal stability.
Innovation Solution
The introduction of a nitrile compound and a siloxane compound in the electrolyte, with specific mass percentages, synergistically works to reduce gas production, improve cycle performance, and enhance high-temperature storage capabilities by adsorbing oxidizable components and inhibiting hydrolysis reactions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional electrolyte composition is used, then the battery can operate normally, but high-temperature storage gas production increases and cycle performance deteriorates
Solution Approach 1:
The patent introduces a siloxane compound as an intermediary substance in the electrolyte that mediates between the electrodes and the electrolyte system. This compound forms a protective interface layer that prevents direct harmful interactions, reduces gas generation, and improves cycle stability without compromising normal battery operation
Solution Approach 2:
The patent creates a composite electrolyte system by combining siloxane compound with nitrile compound and traditional electrolyte components. This composite approach synergistically reduces gas production while enhancing thermal stability and cycle performance, achieving multiple benefits simultaneously
2Stability of the object's composition
If electrolyte composition is modified to reduce gas production, then high-temperature storage performance improves, but electrolyte complexity increases
Solution Approach 1:
The patent optimizes the concentration parameters of siloxane compound (0.1-10 wt%) and nitrile compound (0.5-5 wt%) in the electrolyte to achieve optimal high-temperature storage stability. By carefully controlling these compositional parameters, the patent reduces gas production without requiring fundamental changes to the electrolyte system architecture
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 combined use of nitrile and siloxane compounds in the electrolyte significantly reduces gas production during high-temperature storage, increases the number of charge cycles, and improves capacity retention, forming a stable protective film on electrodes that prevents decomposition.
Implementation Method 1
synergistically works to reduce gas production, improve cycle performance, and enhance high-temperature storage capabilities by adsorbing oxidizable components
Implementation Method 2
synergistically works to reduce gas production, improve cycle performance, and enhance high-temperature storage capabilities by adsorbing oxidizable components and inhibiting hydrolysis reactions
Data Source
AI summary
The present application provides an electrolyte and a secondary battery comprising the same. The electrolyte is prepared by adding a siloxane compound, a nitrile compound and an electrolyte salt with different contents into an organic solvent.