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Silicon-based thin-film composite pole piece and manufacturing method thereof, and lithium ion battery

A silicon-based film and pole piece technology, applied in battery electrodes, secondary batteries, electrode carriers/current collectors, etc., can solve the problems of unguaranteed silicon monoxide uniformity, weak adhesion, etc. The effect of improving fluid capacity, improving stability, and improving cycle stability

Active Publication Date: 2019-03-29
CALB CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this method, the silicon monoxide generated by reduction is attached to the surface of graphene through adsorption, and the adhesion between the two is weak, and the uniformity of silicon monoxide cannot be guaranteed.

Method used

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  • Silicon-based thin-film composite pole piece and manufacturing method thereof, and lithium ion battery
  • Silicon-based thin-film composite pole piece and manufacturing method thereof, and lithium ion battery
  • Silicon-based thin-film composite pole piece and manufacturing method thereof, and lithium ion battery

Examples

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Effect test

Embodiment 1

[0025] The preparation method of the silicon-based thin film composite pole piece of the present embodiment comprises the following steps:

[0026] (1) Weigh 3g of lithium bis(trimethylsilyl)amide and 0.3g of bis(tetrahydrofuryl)propane into 100g of 1-ethyl-3-methylimidazolium ionic liquid, and stir evenly to obtain an electrolyte;

[0027] (2) With graphene oxide (manufacturer: Nanjing Xianfeng Nano Material Technology Co., Ltd., model: XF0812) as the working electrode, the silicon rod as the counter electrode, and the saturated calomel electrode as the reference electrode, the electrolyte obtained in step (1) In the process, cyclic voltammetry (voltage is -2 ~ 2V, scanning speed is 5mV / s, scanning 10 cycles) is used to deposit silicon dioxide on the surface of the working electrode. After completion, it is cleaned and dried with 0.1mol / L ethylene carbonate. Obtain silica / graphene oxide composite material;

[0028] (3) Transfer the composite material to a tube furnace, first...

Embodiment 2

[0030] The preparation method of the silicon-based thin film composite pole piece of the present embodiment comprises the following steps:

[0031] (1) Weigh 0.5g of lithium hexamethyldisilazane and 0.1g of cyclopentyl ether into 100g of 1-ethyl-3-methylimidazolium ionic liquid, and stir evenly to obtain an electrolyte;

[0032] (2) With graphene oxide (manufacturer: Nanjing Xianfeng Nano Material Technology Co., Ltd., model: XF0812) as the working electrode, the silicon rod as the counter electrode, and the saturated calomel electrode as the reference electrode, the electrolyte obtained in step (1) Adopt constant voltage method (voltage is 2V, time is 30min) to deposit silicon dioxide on the working electrode surface, after finishing, adopt 0.1mol / L ethylene carbonate to clean, dry, obtain silicon dioxide / graphene oxide composite material;

[0033] (3) Transfer the composite material to a tube furnace, first pass argon inert gas to discharge the gas in the tube, then pass hyd...

Embodiment 3

[0035] The preparation method of the silicon-based thin film composite pole piece of the present embodiment comprises the following steps:

[0036] (1) Weigh 5g of lithium bis(trimethylsilyl)amide and 0.5g of ethylene glycol dimethyl ether into 100g of 1-ethyl-3-methylimidazole ionic liquid, and stir evenly to obtain an electrolyte;

[0037] (2) With graphene oxide (manufacturer: Nanjing Xianfeng Nano Material Technology Co., Ltd., model: XF0812) as the working electrode, the silicon rod as the counter electrode, and the saturated calomel electrode as the reference electrode, the electrolyte obtained in step (1) The constant current method (current density of 10mA / cm 2 , the time is 30min) to deposit silicon dioxide on the surface of the working electrode. After the completion, use 0.1mol / L ethylene carbonate to clean and dry to obtain a silicon dioxide / graphene oxide composite material;

[0038] (3) Transfer the composite material to a tube furnace, first pass argon inert ga...

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Abstract

The invention belongs to the technical field of lithium ion batteries, and specifically relates to a silicon-based thin-film composite pole piece and a manufacturing method thereof, and a lithium ionbattery. The manufacturing method of the silicon-based thin-film composite pole piece comprises the following steps: (1) uniformly mixing organosilane lithium, a film-forming additive and an ionic liquid, to obtain an electrolyte; (2) using graphene oxide as a working electrode and silicon as a counter electrode, and saturated calomel as a reference electrode, depositing silicon dioxide on the surface of the working electrode by an electrochemical deposition method in the electrolyte obtained in the step (1), to obtain a silica / graphene oxide composite material; (3) under a reducing atmosphere, heating the silica / graphene oxide composite material to 600-800 DEG C and keeping warm for 1 to 6 h, and then cooling to obtain a silicon-monoxide / graphene composite material, that is, a silicon-based thin-film composite pole piece. A lithium ion battery in which the silicon-based thin-film composite pole piece obtained by the method is a negative electrode has advantages of high specific capacity, excellent cycle performance, and excellent rate capacity.

Description

technical field [0001] The invention belongs to the technical field of lithium-ion batteries, and in particular relates to a silicon-based thin-film composite pole piece, a preparation method thereof, and a lithium-ion battery. Background technique [0002] At present, since the theoretical specific capacity of silicon (4200mAh / g) is much greater than that of graphite (372mAh / g), and silicon resources are very abundant in nature, silicon materials are considered to be the most promising materials to replace graphite as the next generation lithium battery. Ion battery anode material. However, when the silicon material is used as the negative electrode material of the lithium-ion battery, the silicon material will expand and shrink severely during the charging and discharging process of the lithium-ion battery, which will cause the active material on the electrode material to fall off and affect the cycle stability of the battery. Due to the small change in volume during the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/1391H01M4/131H01M4/66H01M10/0525
CPCH01M4/131H01M4/1391H01M4/663H01M10/0525Y02E60/10
Inventor 赵晓锋邱彦星李利淼
Owner CALB CO LTD
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