Solid-State Sodium Electrode Mixture for Stable Ion-Conductive Cycling
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Solution Overview
Problem
Current all-solid-state sodium storage batteries face challenges in achieving high ion conductivity between solid electrolytes and active materials while maintaining electron conductivity, leading to limited charging-discharging capacity and cycle life due to heterogeneous crystalline phases and sintering issues.
Innovation Solution
An electrode mixture comprising polyphosphate acid transition metal oxide clusters with ion and electron conductive assistants, such as ethylene carbonate and carbon materials, is developed to enhance ion and electron conductivity, preventing sintering and promoting stable charge-discharge cycles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If solid electrolyte particles are used, then ion conductivity is improved, but sintering occurs leading to conductive network breakdown
Solution Approach 1:
The patent applies a protective coating on the surface of solid electrolyte particles before assembly into the electrode. This pre-applied coating acts as a cushioning layer that prevents direct contact and sintering between solid electrolyte particles during battery operation, thereby maintaining the conductive network stability while preserving ion conductivity.
Solution Approach 2:
The patent introduces a thin film coating on solid electrolyte particles that acts as a flexible protective shell. This shell prevents sintering and maintains particle separation, ensuring the stability of the conductive network while allowing ion transport through the coating, thus resolving the contradiction between ion conductivity and network stability.
2Productivity
If active material volume changes during charge-discharge, then electrochemical activity is improved, but conductive network breaks down
Solution Approach 1:
The patent employs a porous conductive assistant material that can accommodate volume changes of the active material during charge-discharge cycles. The porous structure provides expansion space and maintains continuous conductive pathways even when active material particles expand or contract, thus preserving both electrochemical activity and conductive network integrity.
Solution Approach 2:
The patent creates a dynamic conductive network using flexible conductive assistant materials that can adapt to the changing volume of active material during operation. This dynamic structure maintains electrical connectivity throughout the charge-discharge cycles, allowing high electrochemical activity while preventing conductive network breakdown.
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 electrode mixture boosts ion conductivity, maintains high discharging capacity at room temperature, and improves cycle life by preventing conductive network breakdown during volume changes, ensuring efficient energy storage and safety.
Implementation Method 1
Since this solid electrolyte conducts ions between the positive electrode and the negative electrode
Implementation Method 2
preventing sintering and promoting stable charge-discharge cycles
Implementation Method 3
An electrode mixture comprising polyphosphate acid transition metal oxide clusters with ion and electron conductive assistants, such as ethylene carbonate and carbon materials, is developed to enhance ion and electron conductivity
Data Source
AI summary
Provided is an electrode mixture used for an all-solid-state sodium storage battery that can maintain a high discharging capacity in a room temperature environment and exhibit excellent charge-discharge cycle characteristics. Further provided is a storage battery comprising the same. An object of the present invention is to provide an electrode mixture used for an all-solid-state sodium storage battery, the electrode mixture comprising an active material, wherein the active material is a cluster formed of polyphosphate acid transition metal oxide with a plurality of individual particles connected together, each particle having a particle size within the range of 0.1 μm to 100 μm.