Anode material with core-shell structure and manufacture method thereof
A negative electrode material and core-shell structure technology, applied in structural parts, battery electrodes, electrical components, etc., can solve the problems of capacity fading, volume change cannot form a stable solid electrolyte film, hinder large-scale commercial application, etc., to improve electrical conductivity performance, excellent rate capability and cycle stability, excellent electrochemical performance and cycle stability
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Embodiment 1
[0033] This embodiment provides an alumina / silicon-carbon composite negative electrode material with a core-shell structure, which is prepared by the following steps:
[0034] (1) Ingredients
[0035] According to chitosan: water is the mass ratio of 0.5:100, acetic acid: water is the mass ratio of 0.5:100, get chitosan, acetic acid, water and mix and be formulated with chitosan-acetic acid-water solution;
[0036] (2) Preparation of core-shell silicon structure
[0037] According to the mass ratio of silicon material: chitosan-acetic acid-water solution of 0.5:1, and the mass ratio of silicon material: alumina powder of 1:5, silicon material and alumina powder are taken; wherein the silicon material is silicon oxide , the alumina powder is nano-scale α-alumina powder with a purity of 99.99%; mix and stir the silicon material, chitosan-acetic acid-water solution evenly, so that the surface of the silicon material is evenly coated with a layer of chitosan-acetic acid- water s...
Embodiment 2
[0047] This embodiment provides an alumina / silicon-carbon composite negative electrode material with a core-shell structure, which is prepared by the following steps:
[0048] (1) Ingredients
[0049] By chitosan: water is the mass ratio of 2:100, acetic acid: water is the mass ratio of 5:100, get chitosan, acetic acid, water and mix and be formulated with chitosan-acetic acid-water solution;
[0050] (2) Preparation of core-shell silicon structure
[0051] According to the mass ratio of silicon material: chitosan-acetic acid-water solution of 1:1, and the mass ratio of silicon material: alumina powder of 1:10, silicon material and alumina powder are taken; wherein the silicon material is nano silicon powder ; Mix and stir the silicon material, chitosan-acetic acid-water solution evenly, so that the surface of the silicon material is evenly coated with a layer of chitosan-acetic acid-water solution; The aluminum powder is put into a ball mill for ball milling, rotated and co...
Embodiment 3
[0056] This embodiment provides an alumina / silicon-carbon composite negative electrode material with a core-shell structure, which is prepared by the following steps:
[0057] (1) Ingredients
[0058] By chitosan: water is the mass ratio of 5:100, acetic acid: water is the mass ratio of 2:100, get chitosan, acetic acid, water and mix and be formulated with chitosan-acetic acid-water solution;
[0059] (2) Preparation of core-shell silicon structure
[0060] According to the mass ratio of silicon material: chitosan-acetic acid-water solution of 2:1, and the mass ratio of silicon material: alumina powder of 1:10, silicon material and alumina powder are taken; wherein the silicon material is silicon oxide The mixture with nano-silica powder, the mass ratio of silicon oxide: nano-silica powder is 0.5:1. Mix and stir the silicon material, chitosan-acetic acid-water solution evenly, so that the surface of the silicon material is evenly coated with a layer of chitosan-acetic acid -...
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