Amine-Modified Acrylamide Binder for Battery Electrode Stability
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Solution Overview
Problem
The stability of water-soluble polymers containing a (meth)acrylamide monomer unit in secondary battery binder compositions changes over time, leading to viscosity changes that can affect electrode adherence and battery performance, including cycle characteristics and shape integrity during repeated charge/discharge cycling.
Innovation Solution
A binder composition is developed using a water-soluble polymer with a (meth)acrylamide monomer unit and a specific amine compound, such as hydroxylamine sulfate or diethylhydroxylamine, within defined content ranges to inhibit viscosity changes and enhance electrode adherence and battery performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a water-soluble polymer including a (meth)acrylamide monomer unit is used as a binder, then electrode close adherence and charge/discharge characteristics are improved, but viscosity changes over time due to partial crosslinking, leading to deterioration of battery performance
Solution Approach 1:
The patent introduces a specific amine compound as an intermediary substance that interacts with the (meth)acrylamide polymer to prevent partial crosslinking. The amine compound acts as a mediator between the polymer chains, blocking the crosslinking reaction while maintaining the polymer's water solubility and binding functionality, thus stabilizing viscosity over time without sacrificing electrode adherence.
Solution Approach 2:
The patent changes the chemical parameter of the binder composition by adding a specific amine compound with controlled content (0.1-10 wt% relative to polymer). This parameter change transforms the polymer's chemical state, preventing the time-dependent crosslinking that would otherwise occur, thereby maintaining stable viscosity while preserving the beneficial adherence properties.
2Reliability
If a (meth)acrylamide polymer is used to achieve excellent electrode close adherence, then battery cycle characteristics are improved, but partial crosslinking occurs over time causing viscosity change and electrode swelling
Solution Approach 1:
The amine compound serves as a protective intermediary that prevents direct interaction between (meth)acrylamide groups on different polymer chains, thereby blocking the crosslinking pathway that would lead to electrode swelling and shape change during cycling. This maintains the electrode's structural integrity and shape stability.
3Ease of manufacture
If a water-soluble polymer with (meth)acrylamide monomer unit is used, then binder composition provides good dispersing ability and viscosity modification, but preservative is required to prevent polymerization during storage
Solution Approach 1:
The amine compound acts as a chemical intermediary that fundamentally changes the polymer's reactivity profile. By forming a stable complex or adduct with the (meth)acrylamide groups, it prevents spontaneous polymerization during storage, eliminating or reducing the need for separate preservative agents and simplifying the overall formulation.
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 solution effectively stabilizes the viscosity of the water-soluble polymer, ensuring excellent electrode adherence, cycle characteristics, and preventing battery shape changes during repeated cycling, thereby extending the battery's service life and maintaining performance.
Implementation Method 1
a binder composition for a nonaqueous secondary battery electrode includes a water-soluble polymer including a (meth)acrylamide monomer unit and a specific amine compound
Implementation Method 2
a water-soluble polymer including a (meth)acrylamide monomer unit... excellent electrode close adherence
Data Source
AI summary
A binder composition for a non-aqueous secondary battery electrode contains a water-soluble polymer including a (meth)acrylamide monomer unit and an amine compound. Percentage content M0 of the (meth)acrylamide monomer unit is at least 40 mass% and not more than 100 mass% relative to 100 mass% of all monomer units of the water-soluble polymer. Content M1 of the amine compound is at least 0.01 parts by mass and not more than 0.5 parts by mass per 100 parts by mass of solid content of the water-soluble polymer.