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Anode material for non-aqueous electrolyte secondary battery, and preparation method and application thereof

A non-aqueous electrolyte, secondary battery technology, applied in the intersection of nanomaterials and new energy technology, can solve problems such as volume expansion

Active Publication Date: 2017-06-13
彭宪利
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Aiming at the deficiency of existing silicon-based negative electrode materials, the present invention innovatively proposes a novel silicon oxide (SiO x , 0<x<2) One-dimensional nanomaterials can effectively solve the problem of volume expansion during charging and discharging, so that the material has high capacity and good cycle performance and rate performance

Method used

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  • Anode material for non-aqueous electrolyte secondary battery, and preparation method and application thereof
  • Anode material for non-aqueous electrolyte secondary battery, and preparation method and application thereof
  • Anode material for non-aqueous electrolyte secondary battery, and preparation method and application thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0088] Embodiment 1 Preparation of silicon oxide one-dimensional nanomaterial

[0089] Get 10.0g cetyltrimethylammonium bromide (CTAB) and 11.2g solid Na 2 SiO 3 9H 2 O, dissolved in 175 mL of deionized water with stirring and sonication to form a homogeneous solution. Then 175 mL of ethyl acetate was added to the solution, and the mixture was left standing at room temperature for 5 hours, and then heated by a 90° C. water bath for 50 hours. After carrying out the above hydrothermal synthesis reaction in a polytetrafluoroethylene reactor with a polytetrafluoroethylene liner, FeCl 3 Solution treatment, and through centrifugation, and 70 ℃ baked to dryness, dried 4 hours at 400 ℃, obtained solid product double mesoporous silica pellet; Gained silica pellet was placed in ethylenediamine solution ( The volume ratio of diamine and deionized water is 2:1) and heated in steam (200°C) for 30 hours, then use 1mol / L hydrochloric acid solution to remove the iron element in the soluti...

Embodiment 2

[0090] Embodiment 2 Preparation of one-dimensional silicon oxide / carbon composite material

[0091] Get the SiO prepared by Example 1 x 0.1 g of nanowires was dispersed in 10 mL of deionized water, and then mixed with 0.35 g of CTAB. After 30 minutes of ultrasonication and 30 minutes of stirring, 0.5 g of resorcinol, 45.5 mL of pure ethanol and 0.15 mL of ammonia were added to the mixed solution in sequence, and Stir at 35°C for 30 minutes. After that, 0.08 mL of formalin was added to the mixed solution, and stirred overnight. The resulting sample was centrifuged and washed with deionized water and pure ethanol to obtain SiO coated with resorcinol-formaldehyde (RF) resin. x Nanowire core-shell nanostructure, the core-shell structure product is carbonized in an argon atmosphere at 600°C for 5 hours to prepare one-dimensional SiO x / carbon composite. The SEM and TEM characterization results of the composite material are as follows: figure 2 As shown, the thickness of the ...

Embodiment 3

[0093] Weigh 1 g of PVDF, add to NMP solution to dissolve, and stir at high speed for 2 hours to prepare a mixed solution. Take 8.0 g of one-dimensional silicon oxide nanomaterials (prepared in Example 1) and 1.0 g of carbon black, add them to the above solution, and stir at high speed for 1 hour. The uniformly dispersed slurry obtained is coated on a copper foil, dried at 70° C., and rolled with a pair of rollers to obtain a usable electrode. The above-prepared pole piece, diaphragm, lithium sheet, and stainless steel gasket were stacked in sequence, and 200 μL of electrolyte was added and then sealed to form a 2016-style lithium-ion button battery. The capacity and discharge efficiency were tested on the small charge and discharge equipment (LAND CT2001A) of Wuhan Landian Electronics Co., Ltd.

[0094] In the above electrode, the loading amount of the active material is 1.0-1.2 mg / cm 2 , The voltage test window is 0.01-3V. At a current density of 100mA / g, the first discha...

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Abstract

The invention discloses an anode material for a non-aqueous electrolyte secondary battery, and a preparation method and application thereof. The anode material is prepared from a silicon oxide one-dimensional nano material or a carbon-coated one-dimensional silicon oxide / carbon composite material. The anode material has good electrochemical performance such as higher capacity and good multiplying and circulating performance, and has a good application prospect in the field of energy storage devices such as lithium ion batteries. During a charging / discharging process of the anode material, expansion mainly occurs in the radial direction of the one-dimensional nano material, and the expansion rate of a battery pole piece containing the active material can be reduced to 20 percent or less. According to the one-dimensional nano material provided by the invention, a synthesis technology and a carbon coating technology are simple and practical, the source of raw materials is wide, the device requirements are low, the preparation efficiency is high, and the one-dimensional nano material is suitable for large-scale popularization and application.

Description

technical field [0001] The invention relates to the intersection field of nanometer materials and new energy technologies, and more specifically relates to a negative electrode material for a non-aqueous electrolyte secondary battery and a preparation method and application thereof. Background technique [0002] With the rapid development of portable electronic devices and electric vehicles in recent years, non-aqueous electrolyte secondary batteries with high energy density are urgently required in terms of cost, size, and weight reduction. The current commercial lithium-ion battery anode materials are mainly carbon-based materials, but due to its low theoretical capacity (372mAh / g), it greatly limits the further improvement of the energy density of lithium-ion batteries. [0003] Among many new lithium-ion battery anode material systems, silicon-based anode materials have a higher theoretical capacity (4200mAh / g), which is more than 10 times the theoretical capacity of car...

Claims

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Application Information

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IPC IPC(8): H01M4/48H01M4/38H01M4/36H01M4/583H01M4/62H01M10/0525
CPCH01M4/366H01M4/386H01M4/48H01M4/583H01M4/625H01M10/0525Y02E60/10
Inventor 彭宪利
Owner 彭宪利
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