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Silicon composite material and preparation method thereof, negative electrode sheet and lithium ion battery

A technology of silicon composite materials and carbon materials, applied in nanotechnology for materials and surface science, battery electrodes, secondary batteries, etc., can solve the problem of cycle performance and safety performance that need to be improved, unfavorable for the industrialization of silicon materials, and electrical conductivity There are major problems in the stability of the network and hollow structures

Active Publication Date: 2022-08-05
HIGHPOWER TECH HUIZHOU
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this structure only solves the space problem required for the external conductive network of silicon and particle expansion, but there are still big problems in the stability of the conductive network and hollow structure inside the core particle, and the cycle performance and safety performance need to be improved, which is not conducive to silicon Material industrialization promotion

Method used

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  • Silicon composite material and preparation method thereof, negative electrode sheet and lithium ion battery
  • Silicon composite material and preparation method thereof, negative electrode sheet and lithium ion battery
  • Silicon composite material and preparation method thereof, negative electrode sheet and lithium ion battery

Examples

Experimental program
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Effect test

Embodiment 1

[0085] This embodiment provides a kind of silicon composite material, and its preparation method is as follows:

[0086] S1: Place a silicon-nickel alloy with a total content of 10 mol (atomic ratio of silicon and nickel 9:1) in 1.5 L of a hydrochloric acid solution with a concentration of 1 mol / L, and immerse it for 2 hours to remove some metals in the silicon-nickel alloy to form a Through-hole silicon in the channel, and some metal remains in the through-hole silicon as a catalyst for the growth of one-dimensional carbon materials;

[0087] S2: The through-hole silicon is dried and placed in a tube furnace, and a mixed gas of methane and nitrogen with a gas flow of 100 mL / min is introduced, wherein methane accounts for 10% of the gas flow, and nitrogen accounts for 90% of the gas flow. Generate a one-dimensional carbon material running through the channel of the through-hole silicon to obtain an intermediate product;

[0088] S3: The intermediate product was placed in a 2 ...

Embodiment 2

[0094] This embodiment provides a kind of silicon composite material, and its preparation method is as follows:

[0095] S1: Place the SiAlFe alloy with a total content of 10mol (the atomic ratio of silicon, aluminum and iron is 6:2:2) in 3L of hydrochloric acid solution with a concentration of 2mol / L, and immerse it for 2h to remove some metals in the SiAlFe alloy , forming through-hole silicon with pores, and at the same time, some metal remains in the through-hole silicon as a catalyst for growing one-dimensional carbon materials;

[0096] S2: The through-hole silicon is dried and placed in a tube furnace, and a mixed gas of ethylene and argon with a gas flow of 200 mL / min is introduced, wherein ethylene accounts for 10% of the gas flow, and argon accounts for 90% of the gas flow. In-situ generation of one-dimensional carbon material running through the channel of the through-hole silicon to obtain an intermediate product;

[0097] S3: The intermediate product is placed in...

Embodiment 3

[0103] This embodiment provides a kind of silicon composite material, and its preparation method is as follows:

[0104] S1: Place the ferrosilicon-copper alloy (the atomic ratio of silicon, iron and copper is 4:4:2) with a total content of 10mol in 4L of hydrochloric acid solution with a concentration of 2mol / L, and immerse it for 2h to remove the ferrosilicon in the copper alloy. Part of the metal to form through-hole silicon with pores, and at the same time, some metal remains in the through-hole silicon as a catalyst for growing one-dimensional carbon materials;

[0105] S2: The through-hole silicon is dried and placed in a tube furnace, and a mixed gas of propylene and argon with a gas flow of 200 mL / min is introduced, wherein propylene accounts for 10% of the gas flow, and argon accounts for 90% of the gas flow. In-situ generation of one-dimensional carbon material running through the channel of the through-hole silicon to obtain an intermediate product, which is then pl...

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Abstract

The invention discloses a silicon composite material and a preparation method thereof, a negative electrode sheet and a lithium ion battery. The silicon composite material includes through-hole silicon and a carbon coating layer, and a one-dimensional carbon material is arranged in the channel of the through-hole silicon. The through-hole silicon provided with the one-dimensional carbon material in the channel provided by the embodiment of the present application is beneficial to improve the conductivity of the silicon particles from the inside of the silicon material. At the same time, the channels of the through-hole silicon provide a good buffer space for the material to avoid volume expansion of the material. The network structure formed by the interlaced one-dimensional carbon materials in the channels of the through-hole silicon can effectively restrain the volume expansion of the silicon material, greatly stabilize the internal structure of the silicon particles, solve the problem of pulverization, and effectively maintain the conductive network between the silicon particles. The cycle performance of the battery made of this material is effectively improved. In addition, the provision of the carbon coating layer is beneficial to reduce the contact between the silicon composite material and the electrolyte during use, thereby reducing side reactions, and can further improve the electronic conductivity of the silicon composite material.

Description

technical field [0001] The present application relates to the technical field of lithium ion batteries, in particular to a silicon composite material and a preparation method thereof, a negative electrode sheet and a lithium ion battery. Background technique [0002] Silicon-based materials (silicon-containing oxides) are considered as ideal anode materials for next-generation high-performance lithium-ion batteries due to their high specific capacity, moderate operating potential, abundant reserves, and environmental friendliness. However, the large volume expansion of silicon-based anodes during the charging and discharging process leads to the destruction of the electrode structure and the rapid decay of battery capacity, which severely limits its wide application. [0003] Researchers have made various efforts to suppress the expansion of silicon materials and improve the conductive network of silicon materials. For example, by optimizing the binder to suppress the expan...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/38H01M4/62H01M4/134H01M10/0525C01B32/05B82Y40/00B82Y30/00
CPCH01M4/386H01M4/625H01M4/628H01M4/134H01M10/0525C01B32/05B82Y30/00B82Y40/00Y02E60/10
Inventor 张敏袁号胡大林廖兴群
Owner HIGHPOWER TECH HUIZHOU
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