Electrografting Monomer Anode Coating Silicon Battery Stability
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Solution Overview
Problem
Conventional lithium batteries face issues with the degradation of the anode structure due to the formation of cracks in the SEI film caused by volumetric expansion and shrinkage of active materials during charging/discharging, leading to direct contact between the electrolyte and active material, which results in continuous decomposition and degradation, especially when active materials like silicon are used.
Innovation Solution
An organic electrolyte solution is developed that includes a monomer compound capable of electrografting, which forms a monolayer on the active material surface, preventing direct contact with the electrolyte and facilitating lithium ion diffusion, thereby preventing crack formation and improving charge/discharge characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional organic electrolyte solutions are used, then lithium batteries can operate at high voltages, but the SEI film cracks and delaminates due to volumetric expansion and shrinkage of active material during charging/discharging, causing continuous electrolyte decomposition and anode degradation
Solution Approach 1:
The monomer compound is added to the electrolyte solution before battery assembly, where it proactively forms a protective coating on the anode surface during initial charging cycles. This preliminary action creates a stable interface layer that prevents subsequent SEI film cracking and electrolyte decomposition during normal battery operation
Solution Approach 2:
The monomer compound acts as an intermediary substance between the electrolyte and the anode active material. It forms a coating layer that mediates the interaction, preventing direct contact between the electrolyte and anode while still allowing lithium ion transport, thus eliminating the harmful cracking and decomposition effects
2Quantity of substance
If silicon is used as active material to increase capacity, then energy density improves, but large volumetric changes during charge/discharge cause severe SEI film degradation and silicon particle agglomeration
Solution Approach 1:
The monomer compound forms a flexible thin film coating on the silicon particles and anode surface. This coating layer accommodates the large volumetric expansion and contraction of silicon during charging/discharging cycles without cracking, maintaining structural integrity and preventing particle agglomeration while allowing lithium ion diffusion
Solution Approach 2:
The monomer compound provides beforehand cushioning by forming a protective coating layer on the silicon particles before they undergo volumetric changes. This pre-formed layer absorbs and distributes the mechanical stress from expansion/shrinkage, preventing direct damage to the silicon structure and preventing electrolyte contact that would cause degradation
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 use of the electrograftable monomer compound in the organic electrolyte solution enhances the stability and reliability of lithium batteries by preventing crack formation and agglomeration of silicon particles, leading to improved charge/discharge efficiency and extended cycle life.
Implementation Method 1
the present invention relates to organic electrolyte solutions using monomer compounds which can be electrografted
Implementation Method 2
facilitating lithium ion diffusion
Data Source
AI summary
An organic electrolyte solution and a lithium battery using the same are provided. The organic electrolyte solution uses a monomer compound which can be electrografted, and which prevents crack formation caused by volumetric changes in the anode active material during battery charging/discharging. This improves charge/discharge characteristics, thereby improving the stability, reliability, and charge/discharge efficiency of the battery.