Solid-State Lithium Primary Battery Electrolyte Coating Without Liquid Filling
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Solution Overview
Problem
Traditional lithium primary batteries face challenges due to the flammability and corrosiveness of organic electrolytes, difficulty in manufacturing, and issues with electrolyte overfilling or underfilling, leading to inconsistent production and reduced service life and self-discharge.
Innovation Solution
The introduction of polymer and oxide solid electrolytes in the positive active coating and electrolyte layer of the lithium primary battery, eliminating the need for liquid injection and improving interface compatibility, resulting in a solid-state battery with enhanced safety, energy density, and reduced self-discharge.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If organic electrolytes are used in traditional lithium primary batteries, then the battery can operate, but the flammability and corrosiveness of organic electrolytes reduce safety and reliability
Solution Approach 1:
The patent changes the physical state of the electrolyte from liquid organic electrolyte to solid polymer and oxide electrolytes. This parameter change eliminates the flammability and corrosiveness associated with liquid organic electrolytes while maintaining ionic conductivity necessary for battery operation.
Solution Approach 2:
The patent employs composite electrolyte structures including polymer electrolytes (such as PEO-based) and oxide electrolytes (such as LLZO-based) in combination with lithium salts. These composite materials provide both the mechanical flexibility of polymers and the high ionic conductivity of oxides, achieving superior safety and performance.
2Productivity
If liquid injection method is used for electrolyte filling, then the battery can be assembled, but the difficulty in manufacturing and issues with overfilling or underfilling reduce production efficiency and consistency
Solution Approach 1:
The patent extracts the electrolyte filling step from the manufacturing process by integrating the electrolyte directly into the electrode structure as a solid coating. This eliminates the need for separate liquid injection equipment and procedures, simplifying the manufacturing process and improving consistency.
Solution Approach 2:
The patent merges the electrolyte layer with the electrode structure by coating the solid polymer electrolyte and oxide electrolyte directly onto the electrode surfaces. This integration combines what were previously separate components (electrode and electrolyte) into a unified structure, eliminating the need for separate filling operations.
3Reliability
If solid polymer electrolytes and oxide electrolytes are used, then safety and energy density are improved, but the device structure becomes more complex
Solution Approach 1:
The patent applies different electrolyte materials to different locations within the battery structure. Solid polymer electrolytes are used in specific regions where flexibility and contact with electrodes are needed, while oxide electrolytes are applied where high ionic conductivity is prioritized. This localized application optimizes performance without requiring complete structural redesign.
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 enhances safety, energy density, and extends the service life of lithium primary batteries by improving production efficiency and reducing self-discharge through the use of polymer and oxide solid electrolytes.
Implementation Method 1
The positive active coating includes a positive active material, a first polymer solid electrolyte, an oxide solid electrolyte, and a first lithium salt; the electrolyte layer includes a second polymer solid electrolyte and a second lithium salt
Data Source
AI summary
Provided in the present disclosure is a lithium primary battery and a preparation method thereof. The lithium primary battery includes a positive electrode sheet and a negative electrode sheet, in which the positive electrode sheet includes a positive current collector, and both a positive active coating and an electrolyte layer sequentially provided on at least one surfaces of the positive current collector, the positive active coating includes a positive active material, a first polymer solid electrolyte, an oxide solid electrolyte, and a first lithium salt, and the electrolyte layer includes a second polymer solid electrolyte and a second lithium salt.