All-Solid-State Battery Assembly for Lithium Dendrite Inhibition
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Solution Overview
Problem
Existing all-solid-state batteries face challenges in inhibiting the formation of lithium dendrites, which can lead to short circuits and reduced capacity, particularly in anode-free batteries where the negative electrode lacks a mixture.
Innovation Solution
A manufacturing method involving primary and secondary pressing steps with simultaneous heating is applied to an electrode assembly, enhancing the interfacial contact between the solid electrolyte layer and the negative electrode current collector, thereby inhibiting lithium dendrite formation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the contact area between the solid electrolyte layer and the negative electrode current collector is increased, then lithium dendrite formation is inhibited, but the manufacturing process becomes more complex
Solution Approach 1:
The patent applies preliminary pressing and heating treatments during the manufacturing process to pre-establish optimal contact between the solid electrolyte layer and negative electrode current collector before battery operation. This preliminary action ensures uniform lithium plating from the start, preventing dendrite formation without requiring complex operational controls.
Solution Approach 2:
The patent utilizes controlled changes in temperature and pressure parameters during manufacturing to enhance interfacial contact between layers. By adjusting these physical parameters during the stacking process, the contact area is maximized, ensuring uniform lithium distribution and preventing dendrite growth while maintaining a relatively simple manufacturing流程.
2Manufacturing precision
If heating and pressing are simultaneously performed during secondary pressing, then interfacial contact is improved, but energy consumption increases
Solution Approach 1:
The patent combines the heating and pressing operations into a single simultaneous process during secondary pressing. By merging these two functions into one step rather than performing them separately, the patent achieves improved interfacial contact while minimizing total energy consumption and process time.
Solution Approach 2:
The patent utilizes the thermal softening effect of the solid electrolyte layer during heating, which temporarily increases its deformability. This allows the layer to conform better to the negative electrode current collector surface under pressing, improving contact uniformity without requiring excessive pressure or energy.
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 method improves the lifespan and safety of all-solid-state batteries by ensuring uniform contact and minimizing lithium dendrite growth, resulting in reduced ionic resistance and enhanced battery performance.
Implementation Method 1
a solid electrolyte layer disposed between a positive electrode and a negative electrode
Implementation Method 2
lithium is plated on the negative electrode current collector at the part at which the negative electrode current collector and a solid electrolyte layer contact each other
Implementation Method 3
the lithium plated on the negative electrode current collector is stripped off and moves to the positive electrode
Data Source
Figure 1(a)~1(d)
AI summary
The present invention relates to an all-solid-state battery manufacturing method comprising the steps of: (a) preparing an electrode assembly having a solid electrolyte layer disposed between a positive electrode and a negative electrode, (b) pressing and heating the electrode assembly, (c) receiving the electrode assembly in a battery case to assemble an all-solid-state battery, and (d) pressing and heating the all-solid-state battery, wherein the negative electrode includes no negative electrode mixture, whereby lifespan characteristics of the all-solid-state battery are improved and safety of the all-solid-state battery is secured.