Ring-Shaped Battery Binder for Electrode-Separator Adhesion
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Solution Overview
Problem
Secondary battery cells experience poor cycling performance due to gaps formed between electrode plates and separators, resulting from insufficient adhesion, leading to reduced power performance and shortened battery life.
Innovation Solution
A ring-shaped acrylate copolymer binder is used to enhance adhesion between electrode plates and separators, featuring a larger contact area and reduced mass, which improves bonding performance and cycling stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional binder is used, then the battery structure is simple, but the adhesion between electrode plates and separator is insufficient, leading to gaps and poor cycling performance
Solution Approach 1:
The binder is designed with a ring-shaped structure instead of conventional spherical or irregular shapes. This ring shape provides a larger contact area with the electrode plates and separator, enhancing adhesion and preventing gaps from forming during battery cycling, thereby improving cycling performance without significantly increasing overall device complexity
Solution Approach 2:
The ring-shaped binder concentrates its bonding function at the contact interface between the separator and electrode plates. The hollow center of the ring allows electrolyte penetration while the outer rim provides maximum contact area for adhesion, creating localized quality enhancement at critical bonding points
2Strength
If the binder contact area with electrode plates is increased, then bonding performance is improved, but the binder mass increases
Solution Approach 1:
The ring-shaped binder incorporates a hollow porous structure in its center, which reduces the overall mass of the binder while maintaining structural integrity. The porous design allows electrolyte penetration and reduces material usage, achieving lower binder mass without compromising bonding performance at the contact interface
Solution Approach 2:
The ring shape transitions from a two-dimensional flat structure to a three-dimensional form with a hollow center. This dimensional change increases the surface area to volume ratio, providing larger contact area for bonding while reducing the amount of binder material needed, thus improving bonding performance without proportionally increasing mass
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 ring-shaped binder increases the contact area and specific surface area, reducing internal resistance and polarization losses, thereby improving discharge capacity, cycle life, and utilization rate of secondary batteries.
Implementation Method 1
The acrylate copolymer has good adhesion, and the use of the acrylate copolymer makes the bonding performance between the separator and the electrode plates better
Implementation Method 2
The binder with the ring-shaped structure has a bonding point with a larger area... the binder with the ring-shaped structure has a hollow through hole, so that when comparing the binder with the ring-shaped structure to the spherical binder the same in size, the mass of the binder with the ring-shaped structure is smaller
Data Source
AI summary
The present application relates to the technical field of secondary batteries, and more particularly relates to a binder for secondary batteries, a separator, a secondary battery and an electrical apparatus. The binder for secondary batteries is in a ring shape, and includes an acrylate copolymer. The acrylate copolymer has good adhesion, and a contact point of the binder with the ring-shaped structure is a circle line of the ring-shaped binder. The ring-shaped binder has bonding points with larger areas than a spherical binder, such that good bonding performance can be achieved when the usage amount of the binder with the ring-shaped structure is reduced.