Porous carbon material added into silicon-based negative electrode, silicon-based negative electrode and lithium ion battery

A porous carbon material and silicon-based negative electrode technology, applied in the direction of negative electrodes, battery electrodes, secondary batteries, etc., can solve the problems of high cost and difficulty in the application of advanced porous graphite materials, so as to improve cycle life, improve cycle performance, Effect of suppressing capacity fading

Active Publication Date: 2021-09-07
WANXIANG 123 CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Aiming at the high cost of preparing advanced porous graphite materials and applying them to silicon-based negative electrodes, the purpose of the present invention is to provide a porous graphite material added to silicon-based negative electrodes. Carbon materials, using cheap biomass charcoal as raw materials to prepare porous carbon materials, using the microporous structure of porous carbon to provide enough buffer space for the volume expansion of silicon materials, thereby improving the cycle stability of silicon-based negative electrodes and lithium-ion batteries, Overcoming the current difficulties in the application of advanced porous graphite materials

Method used

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  • Porous carbon material added into silicon-based negative electrode, silicon-based negative electrode and lithium ion battery
  • Porous carbon material added into silicon-based negative electrode, silicon-based negative electrode and lithium ion battery
  • Porous carbon material added into silicon-based negative electrode, silicon-based negative electrode and lithium ion battery

Examples

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Effect test

Embodiment 1

[0033] A porous carbon material added to a silicon-based negative electrode, prepared from coffee grounds, the specific preparation process is as follows:

[0034] (1) Put the waste coffee grounds collected from coffee shops and coffee companies in water and stir them into a suspension overnight. The mass ratio of coffee grounds and water is 1:1. The suspension is purified by freeze-drying at -80°C for 3 days After the coffee grounds powder;

[0035] (2) heating the coffee grounds powder in step (1) at 900° C. for 60 minutes in an argon atmosphere to obtain a hard carbon material;

[0036] (3) Grinding the hard carbon material in a ball mill for several times until the average particle size is 10 μm, the mass ratio of spherical carbon is 1:25, and the interval between each grinding is 10 minutes to obtain a refined powder;

[0037] (4) Pre-carbonize the refined powder at 400°C for 6 hours under an argon atmosphere to obtain a carbonized material;

[0038] (5) Grind the carbo...

Embodiment 2

[0043] A porous carbon material added to a silicon-based negative electrode, prepared from coffee grounds, the specific preparation process is as follows:

[0044](1) The waste coffee grounds collected from coffee shops and coffee companies were placed in water and stirred into a suspension overnight, the mass ratio of coffee grounds and water was 1:2, and then the suspension was freeze-dried at -70°C for 5 days, Obtain purified coffee grounds powder;

[0045] (2) heating the coffee grounds powder in step (1) at 1000° C. for 40 minutes under an argon atmosphere to perform high-temperature oxygen barrier hardening treatment to obtain a hard carbon material;

[0046] (3) Grinding the hard carbon material in a ball mill for several times until the average particle size is 5 μm, the mass ratio of spherical carbon is 1:25, and the interval between each grinding is 5 minutes to obtain a refined powder;

[0047] (4) Pre-carbonize the fine powder at 500°C for 3 hours under an argon a...

Embodiment 3

[0053] A porous carbon material added to a silicon-based negative electrode, prepared from coffee grounds, the specific preparation process is as follows:

[0054] (1) Put the waste coffee grounds collected from coffee shops and coffee companies in water and stir them into a suspension overnight. The mass ratio of coffee grounds and water is 1:2, and then freeze-dry the suspension at -90°C for 3 days. Obtain purified coffee grounds powder;

[0055] (2) heating the coffee grounds powder in step (1) at 9500° C. for 50 minutes under an argon atmosphere to carry out high-temperature oxygen barrier hardening treatment to obtain a hard carbon material;

[0056] (3) Grinding the hard carbon material in a ball mill for several times until the average particle size is 20 μm, the mass ratio of spherical carbon is 1:25, and the interval between each grinding is 8 minutes to obtain a refined powder;

[0057] (4) Pre-carbonize the refined powder at 450°C for 4 hours under an argon atmosph...

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Abstract

The invention relates to the technical field of lithium ion batteries, and aims to provide a porous carbon material added into a silicon-based negative electrode in view of the problem that the cost is high when a high-grade porous structure graphite material is prepared and applied to a silicon-based negative electrode at present. The invention discloses a porous carbon material added into a silicon-based negative electrode, which is prepared by taking a biomass material as a raw material through high-temperature oxygen isolation hardening, particle size refining, low-temperature oxygen isolation pre-carbonization, mixed alkali calcination, cleaning and drying. The invention provides the porous carbon material which can be added into a lithium ion battery silicon-carbon negative plate. The porous carbon material is prepared from a cheap biomass raw material through a specific process. A rich microporous structure is obtained, an enough buffer space is provided for volume expansion of the silicon material through the microporous structure of porous carbon, and the cycle performance of the lithium ion battery is improved.

Description

technical field [0001] The invention relates to the technical field of lithium-ion batteries, in particular to a porous carbon material added to a silicon-based negative electrode, a silicon-based negative electrode and a lithium-ion battery. Background technique [0002] In recent decades, the development of advanced energy storage devices has led to the continuous improvement of the energy density of lithium-ion secondary batteries. Despite many new exploratory studies, silicon materials are still considered the most promising due to their high capacity and abundant resources. negative electrode material. In this regard, in recent years, many studies have focused on silicon-based negative electrodes obtained by physically mixing silicon nanoparticles and graphite materials. The stability of graphite materials can be used to alleviate the volume expansion of silicon materials, which requires graphite materials to have a good microporous structure. It can provide enough buf...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/05H01M4/62H01M4/134H01M10/0525
CPCC01B32/05H01M4/628H01M4/134H01M10/0525H01M2004/027H01M2004/021Y02E60/10
Inventor 宫娇娇黄建根高明霞许梦清
Owner WANXIANG 123 CO LTD
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