Non-Aqueous Battery Electrodes Balancing Capacity and Expansion
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Solution Overview
Problem
Conventional non-aqueous electrolyte secondary batteries face challenges in achieving high capacity, output characteristics, and cycle characteristics simultaneously, with existing technologies like Patent Literature 1 failing to adequately address these issues.
Innovation Solution
Incorporating a sulfonate compound represented by formula (I) on the particle surfaces of a lithium-containing transition metal composite oxide as the positive electrode active material, and using a silicon-containing material with a particle expansion coefficient of less than or equal to 210% as the negative electrode active material, to enhance charge-discharge performance and reduce negative electrode expansion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional active materials are used in the positive electrode, then manufacturing simplicity is maintained, but output characteristics and cycle characteristics cannot be sufficiently improved
Solution Approach 1:
The positive electrode uses a composite material consisting of lithium-containing transition metal oxide particles with sulfonate compounds formed on their surfaces. This composite structure combines the high capacity of transition metal oxides with the beneficial effects of sulfonate surface layers, achieving improved output and cycle characteristics without excessive complexity
Solution Approach 2:
The sulfonate compounds are specifically located on the particle surfaces of the lithium-containing transition metal oxide, creating a localized functional layer. This surface modification approach improves electrode performance at the interface where electrochemical reactions occur, while maintaining the bulk properties of the active material
2Quantity of substance
If high capacity positive electrode materials are used, then battery capacity increases, but negative electrode expansion during charge-discharge increases
Solution Approach 1:
The patent specifies that the silicon-containing material for the negative electrode must have a particle expansion coefficient of less than or equal to 210%. By controlling this physical parameter of the negative electrode material, the expansion issue is addressed while maintaining high capacity functionality
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 battery achieves high capacity and excellent output and cycle characteristics by reducing positive electrode reaction resistance and minimizing negative electrode expansion, thereby improving overall battery performance.
Implementation Method 1
a sulfonate compound present on particle surfaces of the composite oxide
Implementation Method 2
a silicon-containing material having a particle expansion coefficient of less than or equal to 210%
Data Source
AI summary
In a non-aqueous electrolyte secondary battery (10) according to one embodiment of the present invention, a positive electrode (11) contains a lithium-containing transition metal composite oxide and a sulfonic acid compound which is present on the surfaces of particles of said composite oxide. The sulfonic acid compound is a compound represented by formula (I). A negative electrode (12) contains a silicon-containing material having a particle expansion rate of 210% or less. In the formula, A represents a group 1 element or a group 2 element, R represents a hydrocarbon group, and n represents 1 or 2.