Metal lithium negative electrode for secondary battery, preparation method and application thereof
A secondary battery, metal lithium technology, applied in secondary batteries, battery electrodes, lithium batteries, etc., can solve problems such as poor stability, and achieve the effect of promoting deposition, avoiding lithium dendrites, and improving wettability
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Embodiment 1
[0063] Commercialized Ketjen black (ECP-300J) was used as carbon material, dispersed in an acid solution (volume ratio of sulfuric acid and nitric acid 3:1), acidified for 12 hours, centrifuged at 8000 r / min, filtered and dried, and mixed with phosphoric acid ball mill for 10 hours. Afterwards, it was treated at 700° C. for 10 hours in an argon atmosphere to obtain phosphorus-doped Ketjen black (P doping amount was 1.7 atom%). The SEM image of the obtained P-doped Ketjen black is shown in figure 1 ; Contact angle with electrolyte see figure 2 ; The BET data of P Ketjen Black is shown in Figure 3. The P-Ketjen black particles and PVDF were mixed and coated on a Cu current collector (50 μm in thickness) in a mass ratio of 8:2, and the thickness of the coating layer was 100 μm. A porous N-ECP / Cu lithium anode was obtained (in the anode, the Li content was 3 mAh). Under the same structure, the lithium negative electrode without nitrogen-doped Ketjen black was used as a compari...
Embodiment 2
[0065] Using commercialized carbon nanotubes (CNTs) as carbon materials, they were placed in H 2 In the S atmosphere, disperse into an acid solution (volume ratio of sulfuric acid and nitric acid 3:1), acidify for 12 h, centrifuge at 8000 r / min, filter and dry, and heat treatment at 800 °C for 3 h to obtain sulfur-doped carbon nanotubes (S doping amount of 2.3 atom%). The S-CNTs particles were mixed with PVDF at a mass ratio of 9:1 and coated on the Ti current collector with a coating thickness of 150 μm. Porous S-CNTs / Ti was prepared by depositing Li on the collector by electrodeposition in a glove box. Lithium negative electrode. Under the same structure, the lithium anode without sulfur-doped carbon nanotubes was used as the comparison sample. The test found that the cycle life of the S-CNTs / Ti lithium negative electrode with the lithium deposition induced layer of the present invention at a charge-discharge current density of 3mA / cm2 and a charge-discharge area capacity ...
Embodiment 3
[0067] Commercially available graphite (G) was used as carbon material, placed in phosphoric acid (10 g) and 3M concentrated nitric acid solution, ultrasonically dispersed for 30 min, stirred at room temperature for 30 min, centrifuged at 8000 r / min, filtered and dried under argon atmosphere at 800°C After heat treatment for 5 hours, P-doped graphite (P doping amount of 2 atom%) was obtained. The P-doped graphite and PVDF were mixed and coated on the Ni current collector in a mass ratio of 9:1, and the thickness of the coating layer was 150 μm. Porous P-G / Ni lithium was prepared by electrodepositing Li on the current collector in a glove box. negative electrode. Under the same structure, the lithium anode without P-doped graphite was used as the comparison sample. The test found that the use of the P-G / Ni lithium negative electrode with the lithium deposition induced layer of the present invention was 3 mA / cm 2 Charge and discharge current density and 2mAh / cm 2 The cycle li...
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