Preparation method of sodium tablets
Before conducting electrochemical performance tests of materials, the experimental battery is first assembled. In order to avoid the influence of multiple factors, a two-electrode half-cell is usually assembled for measurement, and a metal sodium sheet is generally used as the reference electrode and the pair electrode. The preparation process of sodium anode in button batteries is to cut sodium blocks, roll sodium blocks, and flush sodium tablets.
Traditional preparation methods have many limitations, mainly reflected in the following aspects:
1. The operation is cumbersome, four steps, which increases the preparation time of deduction power.
2. Due to manual operation, the consistency of different batches or even the same batch cannot be guaranteed, and the surface state of size, thickness and surface will be different.
3. The surface is uneven, which is easy to produce dendrites, break through the diaphragm, affect the performance and even short circuit.
4. After preparing sodium tablets, there will be residual debris, which is not easy to handle.
The emergence of commercial sodium tablets avoids most of the problems of traditional preparation and provides more convenient and high-quality consumables for scientific research and development.
Long-term storage without oxidation
Commercial sodium tablets are composed of high-purity metal sodium composite aluminum foil, which are laminated with inert treatment on both sides, and then packaged with four layers of protection, which can be stored for a long time without oxidation (can be stored in the glove box for three months).
Easy to use
The protective film can be removed within 10 seconds, which can be used like a lithium sheet, and the battery assembly efficiency is more than doubled;
The dimensions are consistent
There are five specifications of diameter of 8mm, 12mm, 14mm, 15.6mm, and 18mm, and the thickness is 0.5mm, which can be used for 20mm and 24mm button batteries, with consistent shape and size, and improve the consistency of sodium electrical performance.
The surface is flat, bright, and free of burrs
Compared with homemade sodium tablets, it can reduce micro-short circuits, reduce battery polarization, and improve R&D efficiency.
Composition of sodium tablets
The physicochemical properties of sodium itself determine that it cannot be directly used in traditional metal processing, and is lively and soft, with a low melting point. In order to solve many problems, we designed our own pairing equipment and adopted other metals, and finally formed a process flow through dozens of processes, and by adding other metals as supports, in order not to affect the performance of the battery, the added metals were selected as materials that can be used as current collectors.
Performance diagram of aluminum foil sodium flakes
Figure 1
Figure 1: Long cycle of buckle battery, aluminum foil sodium sheet against hard carbon. The charge ratio capacity is about 290mAh/g, and the discharge is about 280mAh/g.
Figure 2
Figure 2: Long cycle of a buckle battery, aluminum foil sodium sheet against nickel-ferromanganese. The charge ratio capacity is about 115mAh/g, and the discharge ratio capacity is about 112.5mAh/g.
Figure 3
Figure 3: Long cycle of a buckle battery, aluminum foil sodium sheet to NFPP. The charge ratio capacity is about 95mAh/g, and the discharge ratio capacity is about 90mAh/g.
Performance diagram of copper foil sodium tablets
Figure 4
Figure 4: Long cycle of buckle battery, copper foil sodium sheet against hard carbon. The charging ratio capacity is about 300mAh/g, and the discharge is about 290mAh/g.
Figure 5
Figure 5: Long cycle of a buckle battery, copper foil sodium sheets against nickel-iron-manganese. The charge ratio capacity is about 115mAh/g, and the discharge ratio capacity is about 113mAh/g.
Figure 6
Figure 6: Long cycle of a buckle battery, copper foil sodium sheet against NFPP. The charge ratio capacity is about 95mAh/g, and the discharge ratio capacity is about 92 mAh/g.
Solid pouch-sodium strip performance diagram
Figure 7
Figure 7: It is a solid-state battery pouch with sodium banded with oxygen. The charge ratio capacity is about 130mAh/g, and the discharge is about 116 mAh/g.
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