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Method for preparing porous silicon/TiO2 composite negative electrode material by taking diatomite as raw material

A technology of titanium dioxide and negative electrode materials, which is applied in the field of preparing porous silicon/titanium dioxide composite negative electrode materials, can solve the problems of destroying the nano-silicon crystal structure, degradation of battery cycle performance, and easy aggregation of nano-silicon particles, so as to achieve abundant raw material resources, low price, Scientific and reasonable process effect

Inactive Publication Date: 2017-04-26
NORTHEAST DIANLI UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, we have to admit that there is a problem after nano-silicon powder is faced. The deintercalation of lithium ions in silicon will destroy the crystal structure of nano-silicon, and the nano-silicon particles are too small and easy to agglomerate, which will eventually weaken the electrical contact between particles, resulting in battery failure. Decreased cycle performance

Method used

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  • Method for preparing porous silicon/TiO2 composite negative electrode material by taking diatomite as raw material
  • Method for preparing porous silicon/TiO2 composite negative electrode material by taking diatomite as raw material
  • Method for preparing porous silicon/TiO2 composite negative electrode material by taking diatomite as raw material

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Embodiment 1

[0029] Embodiment 1: a kind of method that prepares porous silicon / titanium dioxide composite negative electrode material with diatomite as raw material, it comprises the following steps:

[0030] (1) Purification treatment of diatomite: put diatomite raw soil in a muffle furnace, heat up to 600°C under air atmosphere, calcinate for 5h to remove organic matter, then disperse in 0.01mol / L NaOH solution, stir for 3h , to filter, put the filtered filter cake in an oven, dry at 60°C for 10h, take it out, pour it into an acid solution with a concentration of 4mol / L, and stir it at 80°C for 3h to remove iron oxide, di aluminum, magnesium oxide, then washed with water until neutral, and dried at 60°C for 10 hours to obtain purified diatomite; figure 1 In order to obtain the purified diatomite scanning electron micrograph;

[0031] (2) Preparation of porous silicon / titanium dioxide composite anode material: Add 0.05 g of purified diatomaceous earth to 20 mL of absolute ethanol, then ...

Embodiment 2

[0033] Embodiment 2: a kind of method that prepares porous silicon / titanium dioxide composite negative electrode material with diatomite as raw material, it comprises the following steps:

[0034] (1) Purification treatment of diatomite: put diatomite raw soil in a muffle furnace, heat up to 650°C in an air atmosphere, calcinate for 4 hours to remove organic matter, then disperse in 0.01mol / L NaOH solution, and stir for 3 hours , to filter, put the filtered filter cake in an oven, and dry at 60° C. for 10 h. After taking it out, pour it into an acid solution with a concentration of 5mol / L, stir at 85°C for 3 hours to remove iron oxide, aluminum oxide, and magnesium oxide, then wash with water until neutral, and dry at 60°C for 10 hours to obtain purified After the diatomaceous earth;

[0035] (2) Preparation of porous silicon / titanium dioxide composite anode material: Add 0.10 g of purified diatomaceous earth to 25 mL of absolute ethanol, then add 0.15 mL of deionized water a...

Embodiment 3

[0037]Embodiment 3: a kind of method that prepares porous silicon / titanium dioxide composite negative electrode material with diatomite as raw material, it comprises the following steps:

[0038] (1) Purification treatment of diatomite: put diatomite raw soil in a muffle furnace, heat up to 700°C under air atmosphere, calcinate for 4h to remove organic matter, then disperse in 0.01mol / L NaOH solution, stir for 6h , to filter, put the filtered filter cake in an oven, and dry at 60° C. for 10 h. After taking it out, pour it into an acid solution with a concentration of 6mol / L, stir at 90°C for 8 hours to remove iron oxide, aluminum oxide, and magnesium oxide, then wash with water until neutral, and dry at 60°C for 10 hours to obtain purified After the diatomaceous earth;

[0039] (2) Preparation of porous silicon / titanium dioxide composite anode material: Add 0.15 g of purified diatomaceous earth to 30 mL of absolute ethanol, then add 0.2 mL of deionized water and 0.05 g of hyd...

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Abstract

The invention relates to the technical field of a lithium ion battery, and relates to a method for preparing a porous silicon / TiO2 composite negative electrode material by taking diatomite as a raw material. The method is characterized in that the diatomite after being subjected to purification processing is used as the raw material, and the porous silicon / TiO2 composite negative electrode material is prepared by a hydrolysis method and a magnesiothermic reduction method. The preparation method has the advantages of scientific and reasonable process and low cost and is simple to use; the composite negative electrode material obtained through preparation can be directly used as a negative electrode material of the lithium ion battery and has good cycle stability, the initial reversible specific capacity of the composite negative electrode material is 1,321.0mAh / g in a test under current density of 100mAh / g, the capacity is maintained 774.3mAh / g after circulation of 50 times, and the composite negative electrode material is excellent in electrical property.

Description

technical field [0001] The invention belongs to the technical field of negative electrode materials for lithium ion batteries; specifically, it relates to a method for preparing porous silicon / titanium dioxide composite negative electrode materials from diatomite. Background technique [0002] Silicon has a high theoretical capacity (4200mAh / g), abundant resources, and a moderate voltage platform, making it a potentially high-energy-density anode material for lithium-ion batteries. However, the silicon active material will undergo a huge volume change during repeated charge-discharge cycles, resulting in the pulverization and shedding of the silicon material and the loss of lithium storage capacity, which hinders the practical application of silicon. In order to reduce the huge volume change of silicon during the cycle, people compound silicon materials with other materials, or make nano-scale silicon materials. In recent years, nano-transition metal oxides have become an i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/48H01M10/0525
CPCH01M4/362H01M4/386H01M4/483H01M10/0525Y02E60/10
Inventor 张瑛洁赵丽文楚华袁龙飞
Owner NORTHEAST DIANLI UNIVERSITY
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