Negative Electrode Composite Material for Lithium Ion Battery Safety
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Solution Overview
Problem
Lithium ion batteries face challenges in improving safety performance while maintaining high energy density, as existing methods like inorganic insulating coatings increase processing complexity and reduce pass rates, and affect volume energy density.
Innovation Solution
A negative electrode composite material is developed with a specific surface area ratio of 1-7, incorporating a metal oxide on the active material surface, prepared using a sol-gel method, which enhances safety and cycle performance without significantly impacting energy density.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an inorganic insulating coating is introduced to improve safety performance, then safety performance is improved, but device complexity and processing difficulty increase
Solution Approach 1:
The patent combines the safety function and active material function into a single composite material. The metal oxide particles are dispersed within the active material matrix, creating an integrated structure that provides both electrochemical activity and safety protection without requiring separate coating layers or additional processing steps.
Solution Approach 2:
The patent uses a composite material consisting of metal oxide particles dispersed in an active material matrix. This composite structure inherently provides both the electrochemical functionality of the active material and the safety characteristics of the metal oxide, eliminating the need for separate inorganic insulating coating layers.
2Reliability
If an inorganic insulating coating is introduced to improve safety performance, then safety performance is improved, but manufacturing efficiency decreases
Solution Approach 1:
The patent combines the safety function and active material function into a single composite material. The metal oxide particles are dispersed within the active material matrix, creating an integrated structure that provides both electrochemical activity and safety protection without requiring separate coating layers or additional processing steps.
Solution Approach 2:
The composite material structure provides safety functionality inherently through the dispersed metal oxide particles within the active material matrix itself, rather than requiring external coating processes. The active material serves dual purposes: electrochemical function and structural integration of safety features.
3Reliability
If an inorganic insulating coating is introduced to improve safety performance, then safety performance is improved, but volume energy density decreases
Solution Approach 1:
The patent applies safety functionality locally through dispersed metal oxide particles within the active material matrix rather than through a continuous coating layer. This localized distribution provides safety protection at specific points where needed while maintaining the overall volume available for energy-storing active material.
Solution Approach 2:
The patent uses a composite material consisting of metal oxide particles dispersed in an active material matrix. This composite structure inherently provides both the electrochemical functionality of the active material and the safety characteristics of the metal oxide, eliminating the need for separate inorganic insulating coating layers.
4Reliability
If an inorganic insulating coating is introduced to improve safety performance, then safety performance is improved, but electrode pass rate decreases
Solution Approach 1:
The patent combines the safety function and active material function into a single composite material. The metal oxide particles are dispersed within the active material matrix, creating an integrated structure that provides both electrochemical activity and safety protection without requiring separate coating layers or additional processing steps.
Solution Approach 2:
The composite material structure provides safety functionality inherently through the dispersed metal oxide particles within the active material matrix itself, rather than requiring external coating processes.
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 composite material improves lithium ion battery safety and cycle performance, maintains high energy density, and withstands thermal shock and puncturing tests effectively.
Implementation Method 1
adding an alkoxide of a metal oxide to a pre-acidified second solvent to prepare a sol-gel solution
Implementation Method 2
adding an alkoxide of a metal oxide to a pre-acidified second solvent to prepare a sol-gel solution
Implementation Method 3
adding an alkoxide of a metal oxide to a pre-acidified second solvent to prepare a sol-gel solution
Implementation Method 4
drying and performing heat treatment under an inert gas to obtain a negative electrode composite material
Data Source
AI summary
The present application relates to a negative electrode composite material and preparation thereof and a lithium ion battery. The negative electrode composite material comprises an active material, a metal oxide on the surface of the active material, wherein the ratio of the specific surface area of the negative electrode composite material to the specific surface area of the active material is 1-7. The present application improves the volume energy density and safety performance of a lithium ion battery by selecting a ratio of a specific surface area of the negative electrode composite material to the active material.