Composite Electrode Particles for High-Temp Storage
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Solution Overview
Problem
Existing methods for manufacturing electrochemical device electrodes face challenges in achieving uniformity, high temperature storage characteristics, and cost-effectiveness, particularly due to the destruction of electrode active materials during pressurization and the adverse effects of binder resin migration.
Innovation Solution
The use of composite particles comprising an electrode active material, a particulate binder resin, a water-soluble polymer, and a composite of water-soluble polymer and crystalline cellulose, which are surface-treated and dispersed to form a stable slurry for granulation, allowing for the formation of an electrode active material layer with improved mechanical characteristics and high temperature storage capabilities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If composite particles are pressurized to form an electrode active material layer, then the layer formation is achieved, but the electrode active material may be destroyed when pressure is too strong, deteriorating high temperature storage characteristics
Solution Approach 1:
The patent applies preliminary action by pre-coating the electrode active material particles with a binder resin and water-soluble polymer mixture before granulation. This pre-coating creates a protective layer that binds particles together during subsequent pressurization, preventing material destruction while forming the electrode layer. The water-soluble polymer specifically enhances this protective effect, allowing lower pressurization forces to achieve adequate binding.
Solution Approach 2:
The patent changes physical parameters by using a water-soluble polymer with specific molecular weight and composition ratios. The water-soluble polymer (0.1-10 parts by weight per 100 parts electrode active material) modifies the slurry properties, enabling particle aggregation at lower pressures. This parameter optimization reduces mechanical stress on electrode materials during layer formation, preserving high temperature storage characteristics.
2Strength
If binder resin is used to bind electrode active material, then particle aggregation is achieved, but binder resin migration occurs, causing non-uniform electrode structure
Solution Approach 1:
The patent introduces a water-soluble polymer as an intermediary substance between the binder resin and electrode active material. This intermediary forms a stable slurry that uniformly distributes binding agents during granulation, preventing localized binder resin migration. The water-soluble polymer creates a controlled binding environment that maintains uniform electrode structure while achieving adequate particle aggregation.
Solution Approach 2:
The patent uses a composite binding system combining binder resin (5-50 parts by weight per 100 parts electrode active material) with water-soluble polymer (0.1-10 parts by weight per 100 parts electrode active material). This composite material approach leverages the adhesive properties of binder resin while the water-soluble polymer provides uniform distribution and prevents migration, achieving both strong aggregation and manufacturing precision.
3Ease of manufacture
If conventional slurry methods are used for electrode manufacturing, then electrode formation is achieved, but the method requires high cost, adversely affects working environment, and increases apparatus size
Solution Approach 1:
The patent extracts and eliminates complex drying and solvent removal steps from conventional electrode manufacturing. By using a water-soluble polymer system that enables direct granulation and forming, the method removes unnecessary processing equipment and reduces manufacturing complexity while maintaining electrode formation capability. The water-soluble nature allows simple water removal without expensive thermal processing equipment.
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
This approach enables the production of electrochemical devices with enhanced high temperature storage characteristics and improved mechanical strength, while reducing the risk of electrode active material destruction and binder resin migration, thus improving the manufacturing efficiency and performance of electrochemical devices.
Implementation Method 1
a composite of water-soluble polymer and crystalline cellulose, which are surface-treated and dispersed to form a stable slurry for granulation
Data Source
AI summary
The present invention provides composite particles for an electrochemical device electrode which makes it possible to manufacture an electrochemical device exhibiting excellent high temperature storage characteristics. The composite particles for an electrochemical device electrode of the present invention contain an electrode active material(A), a particulate binder resin (B), a water-soluble polymer (C), and a composite (D) of a water-soluble polymer (d') and crystalline cellulose (d").