Electrode Binder Ratio for Capacity Retention With Fibrous Carbon
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Energy storage devices with electrodes containing fibrous carbon suffer from insufficient capacity retention ratios after charge-discharge cycles due to low dispersibility of fibrous carbon in the active material layer, leading to inefficient current collection and increased side reactions.
Innovation Solution
Incorporating a binder mainly composed of acrylic resin and a polysaccharide polymer, such as carboxymethylcellulose, with a specific mass ratio to enhance the dispersibility of fibrous carbon within the active material layer, thereby improving capacity retention and inhibiting side reactions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If fibrous carbon is used as a conductive agent in the active material layer, then electron conductivity is enhanced, but capacity retention ratio deteriorates due to low dispersibility
Solution Approach 1:
The patent introduces a binder as an intermediary substance between fibrous carbon and the active material layer. The binder improves the dispersibility of fibrous carbon by acting as a mediating material that facilitates uniform distribution, thereby resolving the contradiction between enhancing electron conductivity and maintaining capacity retention ratio.
Solution Approach 2:
The patent creates a composite material system consisting of fibrous carbon, binder, and active material. This composite structure allows the binder to envelop and disperse fibrous carbon uniformly within the active material layer, simultaneously achieving good electron conductivity and high capacity retention ratio through the synergistic combination of materials.
2Reliability
If fibrous carbon content is increased to improve electron conductivity, then conductivity enhancement is achieved, but side reactions increase leading to lower capacity retention
Solution Approach 1:
The binder serves as a protective intermediary layer between fibrous carbon and the electrolyte environment. This intermediary coating reduces direct contact between fibrous carbon and electrolyte, thereby suppressing side reactions while maintaining the electron conductivity benefits of fibrous carbon.
Solution Approach 2:
The patent optimizes the content ratio of fibrous carbon to binder as a key parameter. By controlling this ratio, the system achieves sufficient electron conductivity from fibrous carbon while the binder prevents excessive side reactions, thus improving capacity retention ratio through parameter optimization.
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 acrylic resin and polysaccharide polymer significantly enhances the dispersibility of fibrous carbon, leading to improved capacity retention ratios and reduced side reactions, resulting in more efficient energy storage devices.
Implementation Method 1
the use of acrylic resin and polysaccharide polymer significantly enhances the dispersibility of fibrous carbon
Implementation Method 2
Incorporating a binder mainly composed of acrylic resin and a polysaccharide polymer, such as carboxymethylcellulose, with a specific mass ratio to enhance the dispersibility of fibrous carbon within the active material layer
Data Source
AI summary
An electrode according to one aspect of the present invention is an electrode for an energy storage device, including an active material layer containing an active material, fibrous carbon, a binder mainly containing an acrylic resin, and a polysaccharide polymer, in which the content ratio of the polysaccharide polymer to the acrylic resin on a mass basis is 0.01 or more and 0.40 or less.