Lithium ion battery pre-lithiated silicon-carbon multilayer composite negative electrode material and preparation method thereof

A technology of pre-lithiated silicon carbon and lithium-ion batteries, which is applied in the field of electrochemistry, can solve the problems of high preparation cost, electrode pulverization and falling off, and electrolyte consumption, and achieve good mechanical properties, stable cycle performance, and isolation of electrolyte Effect

Active Publication Date: 2019-12-27
SHENZHEN XIANGFENGHUA TECH CO LTD +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there are two key problems in the development of silicon anode materials: the volume change during the cycle is as high as 300% to 400%, causing the electrode to pulverize and fall off, and at the same time, a fresh surface is produced, which leads to the continuous growth of the SEI film, resulting in the continuous consumption of the electrolyte.
[0006] According to reports, there are five common silicon-carbon composite methods in the industry: 1. Carbon-coated nano-silicon (nano-Si@C): low cost, high initial Coulombic efficiency, but large volume expansion, long-term The cycle stability is poor, and the monomer capacity is generally 400-2000mAh/g
2. Carbon-coated

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  • Lithium ion battery pre-lithiated silicon-carbon multilayer composite negative electrode material and preparation method thereof
  • Lithium ion battery pre-lithiated silicon-carbon multilayer composite negative electrode material and preparation method thereof

Examples

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Embodiment 1

[0042] A method for preparing a lithium-ion battery pre-lithiated silicon-carbon multilayer composite negative electrode material, comprising the following specific steps:

[0043] (1) Put the silica particles in a high-energy ball mill for ball milling. The speed of the ball mill is set at 500 rpm, the mass ratio of balls to particles is set at 100:1, and the milling time is 24 h.

[0044] (2) Place the ball-milled silicon oxide particles in a fusion machine, add lithium-containing ionic liquid LiMIM-TFSI, the mass ratio of silicon oxide particles to lithium-containing ionic liquid is 20:1, and the fusion time is 3 h .

[0045] (3) Put the mixed silicon oxide particles in a high-temperature tube furnace for sintering, pass in argon gas for protection, and raise the temperature to 600 °C for 2 h to make the silicon oxide particles and lithium-containing ionic liquid A sufficient reaction is carried out, and then the temperature is automatically lowered to obtain pre-lithiated...

Embodiment 2

[0050] A method for preparing a lithium-ion battery pre-lithiated silicon-carbon multilayer composite negative electrode material, comprising the following specific steps:

[0051] (1) Put the silicon oxide particles in a jet mill for pulverization.

[0052] (2) Put the pulverized silicon oxide in a fusion machine, add LiBMIM-TFSI, the mass ratio of silicon oxide particles to LiBMIM-TFSI is 20:1, the speed of the fusion machine is 800 rpm, and the fusion time is 5 h.

[0053] (3) The SiO particles fused with LiBMIM-TFSI were placed in a high-temperature tube furnace for sintering, protected by nitrogen gas, and the temperature was raised to 800 °C for 2 h, so that the SiO particles and lithium-containing The ionic liquid undergoes a sufficient reaction, and then the temperature is automatically lowered to obtain pre-lithiated silicon oxide particles.

[0054] (4) Ultrasonic disperse pre-lithiated silicon oxide in an aqueous solution of nickel citrate, wherein the mass ratio o...

Embodiment 3

[0058] A method for preparing a lithium-ion battery pre-lithiated silicon-carbon multilayer composite negative electrode material, comprising the following specific steps:

[0059] (1) Place silicon oxide particles in a mechanical mill for pulverization.

[0060] (2) Put the pulverized silicon oxide particles in a fusion machine, add lithium-containing ionic liquid LiEMIM-PF6, wherein the mass ratio of silicon oxide particles to lithium-containing ionic liquid is 30:1, and the speed of the fusion machine is 1000 rpm, the fusion time is 3h.

[0061] (3) Put the mixed silicon oxide particles in a high-temperature tube furnace for sintering, pass in argon gas for protection, raise the temperature to 500 °C for 2 h, and make the silicon oxide particles and lithium-containing ionic liquid A sufficient reaction is carried out, and then the temperature is automatically lowered to obtain pre-lithiated silicon oxide particles.

[0062](4) Ultrasonically disperse the pre-lithiated sil...

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Abstract

The invention discloses a lithium ion battery pre-lithiated silicon-carbon multilayer composite negative electrode material and a preparation method thereof. The composite negative electrode materialcomprises an amorphous carbon matrix, pre-lithiated silicon monoxide particles and a graphene material, wherein the graphene material is uniformly coated on an outer surface of the pre-lithiated silicon monoxide to form composite particles, and the composite particles are uniformly dispersed in the amorphous carbon matrix. After the silicon monoxide is pre-lithiated, the first effect of the silicon-based negative electrode material is greatly improved, the graphene material is light in weight, high in strength and excellent in conductivity, so mechanical property and conductivity of the composite material are greatly improved, the amorphous carbon matrix plays a role in isolating electrolyte and preventing silicon from being in contact with the electrolyte to generate a large number of unstable SEI films, and experiments show that the composite negative electrode material prepared has characteristics of good mechanical property, high conductivity, high initial coulombic efficiency andstable cycle performance.

Description

technical field [0001] The invention relates to the technology in the field of electrochemistry, in particular to a lithium-ion battery pre-lithiated silicon-carbon multilayer composite negative electrode material and a preparation method thereof. Background technique [0002] Lithium-ion battery has many advantages such as high volume and mass energy density, high power density, long cycle life, high discharge voltage, low self-discharge rate, no memory effect, low environmental pollution, low cost, and wide operating temperature range. The most promising secondary energy storage battery. Lithium-ion batteries have shown broad application prospects in the fields of portable consumer electronics, new energy vehicles, aerospace and large-scale energy storage in daily life. With the development of lightweight and highly integrated equipment, the energy density, cycle life and safety performance of lithium-ion batteries need to be improved urgently, and one of the important st...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/48H01M4/62H01M10/0525
CPCH01M4/366H01M4/483H01M4/625H01M4/62H01M10/0525Y02E60/10
Inventor 赵东辉周鹏伟白宇霍振翔
Owner SHENZHEN XIANGFENGHUA TECH CO LTD
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