Porous silicon copper coated electrode for lithium ion battery and preparation method thereof
A lithium-ion battery, porous silicon technology, applied in battery electrodes, non-aqueous electrolyte battery electrodes, nanotechnology for materials and surface science, etc., can solve problems such as inability to produce firmness, accelerated capacity decay, and electrode structure damage. To achieve the effect of ensuring normal charging and discharging, reducing contact resistance and increasing contact area
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Embodiment 1
[0036] A preparation of a porous silicon copper-plated electrode for lithium-ion batteries, comprising the steps of:
[0037] Core preparation
[0038] (1) Cleaning of polysilicon powder: Soak 10g polysilicon powder of 400 mesh with 10wt% HCl solution for 30min to remove impurities; filter with 1000 mesh standard sieve and clean with deionized water;
[0039] (2) Deposit nano-Ag particles: put the cleaned polysilicon powder into AgNO 3 and HF mixed solution (mixed solution, AgNO 3 The concentration of HF is 0.02mol / L, the concentration of HF is 2wt%), deposit Ag for 2min, and form nano-particle Ag on the surface of polysilicon; filter with 1000 mesh standard sieve, and clean with deionized water;
[0040] (3) Presentation of porous silicon: the polysilicon powder deposited with Ag particles was placed in HF and H 2 o 2 mixed corrosion solution (in the mixed corrosion solution, the concentration of HF is 2.5mol / L, H 2 o 2 The concentration is 1 wt%), at 25°C, the reaction...
Embodiment 2
[0047] The porous silicon copper-plated electrode prepared in Example 1 is used in a lithium-ion half-cell, and the schematic diagram of the assembly is as follows figure 2 As shown, from top to bottom, it includes an upper battery case 1, a shrapnel 2, a gasket 3, a lithium sheet 4, a diaphragm 5, an electrolyte 6, a lower battery case 7 and a porous silicon copper-plated electrode 8;
[0048] The porous silicon copper-plated electrode 8 is placed on the lower battery shell 7, the electrolyte 6 directly infiltrates the porous silicon copper-plated electrode 8, and the electrolyte 6 fills the entire cavity composed of the porous silicon copper-plated electrode 8, the lower battery shell 7 and the diaphragm 5 ;
[0049] The lithium sheet 4 is closely attached to the diaphragm 5, and the upper surface of the lithium sheet 4 is sequentially placed with a gasket 3 and a shrapnel 2 from bottom to top. The gasket 3 and the shrapnel 2 play a role in adjusting the pressure; the shrap...
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