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Preparation method and pole piece of nanoporous silicon carbon material

A nanoporous, silicon-carbon material technology, applied in the direction of nanotechnology, nanotechnology, nanotechnology for materials and surface science, etc., can solve the problems of cycle stability decline, capacity attenuation, material fragmentation, etc., to achieve improved controllability Sexuality, reduce preparation cost, ensure no residue effect

Active Publication Date: 2022-05-20
ZHONGTIAN EMERGING MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the research and development of silicon anode materials are becoming more and more mature, but they still face the problem of material fragmentation and pulverization during the charging and discharging process, which leads to capacity attenuation and cycle stability decline.

Method used

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  • Preparation method and pole piece of nanoporous silicon carbon material
  • Preparation method and pole piece of nanoporous silicon carbon material
  • Preparation method and pole piece of nanoporous silicon carbon material

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preparation example Construction

[0033] A preparation method of nanoporous silicon carbon material, comprising the following steps:

[0034] (1) Mix silicon powder and magnesium powder evenly in a molar ratio of 1:2-2.5, and heat to prepare a silicon-magnesium alloy;

[0035] in:

[0036] Silica powder and magnesium powder are sieved with 100-200 mesh before mixing, and the mixing time is 2-3 hours;

[0037] The heating process needs to be carried out in an inert atmosphere, the heating temperature is between 550-650°C, and the holding time is 2-5 hours; the inert atmosphere is one or a mixture of argon and nitrogen;

[0038] (2) The prepared silicon-magnesium alloy is subjected to dealloying heat treatment under vacuum to dissolve and remove the magnesium atoms on the silicon-magnesium alloy crystal lattice to form vacancies, and the silicon atoms and vacancies recombine to form a nanoporous structure to obtain a magnesium-containing nanoporous silicon precursor body;

[0039] Among them: the degree of va...

Embodiment 1

[0050] Weigh the material according to the molar ratio of industrial silicon powder and magnesium powder as 1:2.2, pass through a 100-mesh sieve, and then mix evenly under a high-speed mixer. The mixing time is 2 hours, and the mixed material is mixed in a heating machine. Prepared by silicon-magnesium alloying, using argon as an inert gas protection atmosphere, heating temperature is 550°C, and holding time is 2-3 hours. After the heat preservation is over, cool the material to normal temperature and take it out, then heat it in a high-temperature vacuum furnace, the vacuum degree is <10Pa, the temperature is 800-1000°C, and the heat preservation time is 3-5 hours. After cooling, the material is taken out and carried out The nanoporous silicon precursor is obtained by crushing and sieving. Subsequently, the sieved nanoporous silicon precursor material was oxidized in a heating mixer, the atmosphere was an air atmosphere, the heating temperature was 600° C., and the holding ti...

Embodiment 2

[0053] Weigh the material according to the molar ratio of industrial silicon powder and magnesium powder as 1:2.2, pass through a 200-mesh sieve, and then mix evenly under a high-speed mixer. The mixing time is 2 hours, and the mixed material is mixed in a heating machine. It is prepared by silicon-magnesium alloying, with argon as the inert gas protection atmosphere, the heating temperature is 600°C, and the holding time is 2-3 hours. After the heat preservation is over, cool the material to normal temperature and take it out, then heat it in a high-temperature vacuum furnace, the vacuum degree is <10Pa, the temperature is 800-1000°C, and the heat preservation time is 3-5 hours. After cooling, the material is taken out and carried out The nanoporous silicon precursor is obtained by crushing and sieving. Subsequently, the sieved nanoporous silicon precursor material was oxidized in a heating mixer, the atmosphere was an air atmosphere, the heating temperature was 600° C., and ...

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Abstract

A method for preparing a nanoporous silicon-carbon material and a pole piece, wherein the method includes the following steps: (1) uniformly mixing silicon powder and magnesium powder at a molar ratio of 1:2-2.5, and heating to prepare a silicon-magnesium alloy with uniform composition; (2) The prepared silicon-magnesium alloy is subjected to dealloying heat treatment under vacuum to dissolve and remove the magnesium atoms on the silicon-magnesium alloy crystal lattice to form vacancies, and the silicon atoms and vacancies recombine to form a nanoporous structure to obtain a magnesium-containing nanoporous silicon precursor (3) Oxidize the nanoporous silicon precursor to form a continuous nano-layer of silicon dioxide on its surface, then pickle to remove residual silicon-magnesium alloy and magnesium, and then filter and dry to obtain nanoporous silicon material (4) Mixing the prepared nanoporous silicon material with a carbon source for CVD carbon coating to prepare a nanoporous silicon-carbon material. The invention prepares the nanoporous silicon by the dealloying method, wherein the high-temperature vacuum treatment and oxidation improve the controllability of the porous structure and the uniform and dense coating of the carbon layer.

Description

technical field [0001] The invention relates to the technical field of batteries, in particular to a preparation method and a pole piece of a nanoporous silicon-carbon material. Background technique [0002] This section is intended to provide a background or context for implementations of the invention that are recited in the claims. The descriptions herein are not admitted to be prior art by inclusion in this section. [0003] With the development of my country's new energy automobile industry, higher requirements are put forward for the energy density of lithium-ion batteries. The transformation of lithium-ion battery anode materials from graphite to silicon-based materials is one of the important measures to achieve the above goals. At present, the research and development of silicon anode materials are becoming more and more mature, but they still face the problem of material fragmentation and pulverization during the charging and discharging process, which leads to c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/485H01M4/62H01M4/131H01M10/0525B82Y30/00B82Y40/00
CPCY02E60/10
Inventor 姚林林贺劲鑫王海林李亚飞缪永华薛驰
Owner ZHONGTIAN EMERGING MATERIALS CO LTD