Method for activating and improving surface loading quantity of nanometer silicon negative electrode of lithium ion battery by employing sulfur template and hydrogen peroxide

A lithium-ion battery and nano-silicon technology, which is applied in the direction of battery electrodes, active material electrodes, nanotechnology for materials and surface science, etc., can solve the problems of limiting lithium ion transmission and limitation, to ensure ion transmission, prevent powder Melting and agglomeration, to achieve the effect of dense shrinkage

Active Publication Date: 2018-07-20
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when this "hard rod" is applied to the silicon anode of lithium-ion batteries, its microporous structure limits the transmission of lithium ions
What's more, its dense structure cannot provide enough buffer space for the volume change of silicon, which ultimately limits its use as a preparation material for thick electrodes.

Method used

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  • Method for activating and improving surface loading quantity of nanometer silicon negative electrode of lithium ion battery by employing sulfur template and hydrogen peroxide
  • Method for activating and improving surface loading quantity of nanometer silicon negative electrode of lithium ion battery by employing sulfur template and hydrogen peroxide
  • Method for activating and improving surface loading quantity of nanometer silicon negative electrode of lithium ion battery by employing sulfur template and hydrogen peroxide

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Embodiment 1

[0035] This embodiment provides a method for increasing the surface loading of nano-silicon negative electrodes of lithium-ion batteries by using sulfur templates and hydrogen peroxide activation, which at least includes the following steps:

[0036] In the first step, take 28.5mL of 4mg / mL graphene oxide dispersion and place it in a 100mL beaker, add 3.41gNa 2 S 2 o 3 ·5H 2 0, then add 1M hydrochloric acid 28mL, stir 30min to make it fully mix, obtain mixed dispersion liquid;

[0037] In the second step, take 28.5 mL of absolute ethanol, add 57 mg of nano-silicon, and sonicate for 20 minutes to obtain a uniform dispersion;

[0038] In the third step, mix the dispersion liquid obtained in the first step and the second step, and then sonicate again for 20 minutes, and then add 500 μL of 30% hydrogen peroxide solution into a 100 mL hydrothermal reaction kettle for hydrothermal reaction. The temperature of the hydrothermal reaction 180°C, the duration of the hydrothermal reac...

Embodiment 2

[0045] The difference with embodiment 1 is:

[0046] The consumption of graphene oxide dispersion liquid is adjusted to 36mL, Na 2 S 2 o 3 ·5H 2 The amount of O was adjusted to 1.63g, the amount of hydrochloric acid was adjusted to 13mL, the amount of absolute ethanol was adjusted to 36ml, and the amount of nano-silicon was adjusted to 72mg. The rest are the same as in Example 1, and will not be repeated here.

[0047] The specific surface area of ​​the three-dimensional porous graphene-silicon composite electrode material is 346m 2 / g, the pore volume is 0.41cm 3 / g, the block density is 0.93g / cm 3 .

Embodiment 3

[0049] The difference with embodiment 1 is:

[0050] The amount of graphene oxide dispersion was adjusted to 39.3mL, Na 2 S 2 o 3 ·5H 2 The amount of O was adjusted to 0.75g, the amount of hydrochloric acid was adjusted to 6.5mL, the amount of absolute ethanol was adjusted to 39.3ml, and the amount of nano-silicon was adjusted to 78.6mg. The rest are the same as in Example 1, and will not be repeated here.

[0051] The specific surface area of ​​the three-dimensional porous graphene-silicon composite electrode material is 384m 2 / g, the pore volume is 0.34cm 3 / g, the bulk density is 0.98g / cm 3 .

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Abstract

The invention belongs to the technical field of a lithium ion battery, and particularly relates to a method for activating and improving surface loading quantity of a nanometer silicon negative electrode of a lithium ion battery by employing a sulfur template and hydrogen peroxide. The method comprises the following steps of adding a sulfur-containing substance and an acid into a graphene dispersion liquid, and performing full stirring to obtain a mixed dispersion liquid; adding nanometer silicon particles into absolute ethyl alcohol, and performing ultrasound to obtain a uniform nanometer silicon dispersion liquid; mixing the two dispersion liquids, performing ultrasound again, adding the two dispersion liquids and the hydrogen peroxide into a hydrothermal reaction kettle for hydrothermalreaction to obtain hydrogel; fully immersing the hydrogel, removing impurity, and removing moisture; and performing desulfuration to obtain a three-dimensional porous graphene-silicon macro body. Gaps are introduced to sheet layers in a three-dimensional graphene network, holes are etched in the sheet layers, on one hand, the electrode expansion is relieved, and high density of the active material is maintained; and on the other hand, smooth ion transmission is favorably ensured under the condition that a thick-density electrode is fabricated from the active material, and the improvement of volume performance and surface capacity of a silicon negative electrode is finally achieved.

Description

technical field [0001] The invention belongs to the technical field of lithium-ion batteries, and in particular relates to a method for increasing the surface loading capacity of nano-silicon negative electrodes of lithium-ion batteries by using sulfur templates and hydrogen peroxide activation. Background technique [0002] As the anode material of lithium-ion batteries with the most potential to replace graphite today, silicon is abundant in reserves and has ten times the mass-specific capacity of the latter. At present, the research of silicon anode is in mass specific capacity (>1000mAh g -1 ) and cycle performance (>500 cycles), rate performance research has made great progress, but unfortunately, the above progress is more in the low electrode loading (<1mg cm -2 ) or thin electrodes (<10um). Under actual battery conditions, that is, based on the weight of the entire device, silicon as an anode does not achieve mass energy density advantages over graphite...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/62H01M10/0525B82Y30/00
CPCB82Y30/00H01M4/362H01M4/386H01M4/625H01M4/628H01M10/0525H01M2004/021H01M2004/027Y02E60/10
Inventor 陶莹韩俊伟陈凡奇杨全红肖菁张辰
Owner TIANJIN UNIV
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