Additive, containing magnesium silicate, for secondary battery electrolyte and preparation method therefor
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Solution Overview
Problem
Existing electrolyte additives for lithium secondary batteries are not eco-friendly and fail to effectively suppress electrochemical side reactions, leading to degradation of battery performance and limited high-performance battery development.
Innovation Solution
A magnesium silicate additive with specific particle size, composition, and surface area is used to improve lithium ion absorption and release, promoting the formation of a solid-electrolyte interphase (SEI) while minimizing charge and discharge capacity impact through a preparation method involving a silicate precursor and ammonium salt mixture.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If existing organic electrolyte additives are used, then battery performance can be maintained, but they are not eco-friendly and fail to suppress electrochemical side reactions effectively
Solution Approach 1:
The patent changes the chemical composition parameter from organic compounds to inorganic magnesium silicate nanoparticles, fundamentally altering the additive's properties to achieve both eco-friendliness and effective suppression of electrochemical side reactions while maintaining battery performance stability
Solution Approach 2:
The patent uses composite magnesium silicate nanoparticles with specific composition (MgSiO3) and controlled particle characteristics, combining inorganic materials to create an additive that provides both environmental benefits and functional performance in suppressing side reactions
2Use of energy by moving object
If high voltage activation is applied to increase energy density, then battery capacity is improved, but side reactions between active material and electrolyte increase
Solution Approach 1:
The magnesium silicate nanoparticles act as an intermediary substance between the active material and electrolyte, forming a protective interface that allows high voltage operation for increased energy density while preventing direct harmful interactions between the electrolyte and active material
3Manufacturing precision
If conventional silica synthesis using TEOS is used, then high-purity inorganic compounds can be synthesized, but the high unit price makes it difficult to secure price competitiveness
Solution Approach 1:
The patent replaces expensive TEOS with cheaper, readily available magnesium salts and silicate sources, using cost-effective raw materials that can be easily sourced, thereby achieving high-purity magnesium silicate synthesis without the high unit price constraint of conventional TEOS-based methods
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 magnesium silicate additive enhances lithium ion transfer and extends battery life by suppressing side reactions and maintaining charge and discharge capacity, as demonstrated by improved capacity retention and reduced interfacial resistance in secondary battery tests.
Implementation Method 1
promote the formation of a solid-electrolyte interphase (SEI)
Implementation Method 2
suppressing electrochemical side reactions
Data Source
AI summary
There is provided an additive, containing magnesium silicate, for a secondary battery electrolyte and a preparation method therefor. The magnesium silicate has a mass ratio of 50 to 70 wt % of oxygen (O), 5 to 20 wt % of magnesium (Al), and 15 to 35 wt % of silicon (Si). The magnesium silicate has a surface area of 50 to 500 m2/g. The magnesium silicate has a pore size of 0.1 to 20 nm.