All-Solid-State Battery Microcapsule Electrode Adhesion
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Solution Overview
Problem
All-solid state batteries face issues with delamination of active materials due to poor adhesion between the electrode and current collector, leading to increased internal resistance and reduced performance, and safety concerns from combustible organic solvents used in traditional lithium secondary batteries.
Innovation Solution
The use of a composite electrode with microcapsules containing a nano-solid electrolyte and a slurry, which coats the current collector, filling empty spaces and improving binding strength, and replacing organic electrolytes with a solid electrolyte to enhance safety and performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a lithium electrolyte is impregnated into a battery assembly with electrode mixture coated on current collector, then the battery can operate, but dust is generated due to deterioration of adhesion between electrode mixture and current collector
Solution Approach 1:
The patent introduces a specific binder material as an intermediary substance between the electrode mixture and current collector to improve adhesion. The binder acts as a mediating layer that prevents direct contact issues between the electrode mixture and current collector, thereby reducing dust generation during compression and operation.
Solution Approach 2:
The patent uses a composite electrode mixture comprising multiple materials including conductive powder, active material, and binder in specific ratios. This composite structure enhances the overall adhesion properties by combining materials with complementary characteristics, preventing delamination and dust generation.
2Reliability
If electrode mixture is coated on current collector, then the battery structure is formed, but adhesion deteriorates and active material delaminates during operation
Solution Approach 1:
The binder serves as an intermediary material that mediates the interface between the active material and current collector. It provides a stable bonding layer that prevents direct degradation reactions and maintains adhesion stability during battery operation, preventing delamination.
Solution Approach 2:
The patent optimizes the binder content ratio and material composition parameters to achieve optimal adhesion. By adjusting these parameters, the binding strength is enhanced while maintaining structural stability during operation.
3Reliability
If AlF coating is formed on current collector surface due to reaction between fluorine source and aluminum, then the reaction occurs, but binding strength deteriorates and resistance increases
Solution Approach 1:
The patent applies preliminary protective measures by selecting binder materials that are resistant to fluorine attack or by optimizing the electrode mixture composition to prevent excessive fluorine release. This preliminary anti-action prevents the formation of harmful AlF coating before it can deteriorate adhesion.
Solution Approach 2:
The patent converts the potential harmful reaction between fluorine and aluminum into a beneficial controlled reaction by optimizing the binder composition. The binder manages the fluorine release to form a stable interface that actually enhances long-term adhesion while maintaining electrical properties.
4Reliability
If organic electrolyte solution is used in lithium secondary battery, then the battery functions, but safety problems occur during external impacts
Solution Approach 1:
The patent fundamentally changes the physical state parameter of the electrolyte from liquid (organic electrolyte solution) to solid (solid electrolyte). This parameter change eliminates the combustibility issue inherent in organic solvents while maintaining the essential electrolyte functions of ion conduction and electrochemical stability.
Solution Approach 2:
The patent converts the safety hazard of combustible organic electrolytes into a safety advantage by using solid electrolyte materials that are inherently non-combustible. The solid electrolyte maintains all necessary electrochemical functions while eliminating the fire safety risks associated with organic solvents.
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 solution improves ion conductivity, reduces internal resistance, and enhances the safety and performance of all-solid state batteries by filling pores with nano-solid electrolyte and using a solid electrolyte, resulting in a high-capacity and high-power battery with improved safety.
Implementation Method 1
a nano-solid electrolyte that is impregnated into pores between an active material and a solid electrolyte
Implementation Method 2
an all-solid state battery in which a solid electrolyte is stacked between a cathode and anode
Data Source
AI summary
Disclosed are an all-solid state battery and a method of manufacturing the same. The all-solid state battery includes: a current collector comprising an electrode mixture comprising an active material, a conductive material, a binder, and a nano-solid electrolyte; and a composite electrode comprising microcapsules. The electrode mixture is formed in a slurry and the microcapsules are configured to coat the slurry on the current collector.