Preparation method of lithium ion battery anode material

A technology for lithium-ion batteries and anode materials, which is applied in the field of preparation of anode materials for lithium-ion batteries, can solve problems such as poor conductivity of SiO materials, and achieve the goal of improving electronic conductivity, conductivity, and chemical and electrochemical stability Effect

Inactive Publication Date: 2017-01-04
DONGGUAN KAIJIN NEW ENERGY TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] In addition, the conductivity of SiO material is extremely poor, and the order of magnitude of conductivity is in the range of insulators (<10-12S / cm)

Method used

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  • Preparation method of lithium ion battery anode material
  • Preparation method of lithium ion battery anode material

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Embodiment 1

[0032] The preparation method of the lithium ion battery anode material provided in this embodiment, such as figure 1 As shown, the lithium-ion battery anode material includes a core layer 1 and a shell layer 2 coated outside the core layer 1, and the core layer 1 is SiO x , wherein, x is 0.5-2.0, the shell layer 2 is carbon, and the preparation method of the anode material at least includes the following steps:

[0033] Wash and dry the rice husks with water to remove dust and soil on the rice husks, then crush the rice husks so that the size of the rice husks is 1mm×1mm, place the rice husks in a high-temperature furnace, and heat them in a helium atmosphere. The temperature was raised to 800 °C at a rate of 25 °C / min, calcined for 10 min, and cooled to 30 °C naturally, then soaked and cleaned with a hydrochloric acid solution with a concentration of 0.1 mol / L at 30 °C, washed with deionized water, and then dried dry to obtain the anode material.

[0034] The BET specific ...

Embodiment 2

[0036] The preparation method of the lithium ion battery anode material provided in this embodiment, such as figure 1 As shown, the lithium-ion battery anode material includes a core layer 1 and a shell layer 2 coated outside the core layer 1, and the core layer 1 is SiO x , wherein, x is 0.5-2.0, and the shell layer 2 is carbon, and the preparation method of the anode material at least includes the following steps:

[0037] Wash and dry the rice husks with water to remove dust and soil on the rice husks, then crush the rice husks so that the size of the rice husks is 0.5mm×0.5mm, place the reed husks in a high-temperature furnace, Heat up to 1000°C at a rate of 15°C / min in an argon atmosphere, calcinate for 15 minutes, cool down to 35°C naturally, wash with a sulfuric acid solution with a concentration of 0.5mol / L at 35°C, and then wash with absolute ethanol , and then dried to obtain the anode material, and then the prepared anode material was placed in a high-temperature f...

Embodiment 3

[0040] The preparation method of the lithium ion battery anode material provided in this embodiment, such as figure 1 As shown, the lithium-ion battery anode material includes a core layer 1 and a shell layer 2 coated outside the core layer 1, and the core layer 1 is SiO x , wherein, x is 0.5-2.0, the shell layer 2 is carbon, and the preparation method of the anode material at least includes the following steps:

[0041] Wash and dry the rice husks with water first to remove dust and soil on the rice husks, then crush the rice husks so that the size of the rice husks is 100 μm×100 μm, and place the corn husks in a high-temperature furnace under nitrogen gas Under the atmosphere, the temperature was raised to 900°C at a rate of 20°C / min, calcined for 15 minutes, and cooled to 25°C naturally, then cleaned with a nitric acid solution with a concentration of 0.3mol / L at 40°C, washed with methanol, and then dried in the air. The anode material is obtained, and the prepared anode m...

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Abstract

The invention belongs to the technical field of lithium ion batteries, and particularly relates to a preparation method of a lithium ion battery anode material. The lithium ion battery anode material comprises a core layer and a shell layer coated outside the core layer, the core layer is SiOx, and the shell layer is carbon, wherein x is more than 0.5 and less than 2. The preparation method at least includes following steps: placing rice husk in a high-temperature furnace; rising temperature to 300-1200 DEG C at a speed of 10-50 DEG C/min in an inert gas atmosphere; calcining for 10s-30min; naturally cooling; using an acid solution to clean; using a solvent to clean; air-drying to obtain the anode material. Compared with the prior art, the anode material prepared by the method has the advantages of high initial coulomb efficiency, good circulating performance and low volume expansion.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to a preparation method of an anode material of a lithium ion battery. Background technique [0002] For a long time, because silicon oxide (SiO) has a good volume effect, people have tried to use it as a lithium-ion battery composite material. It is generally believed that the charging and discharging mechanism of SiO negative electrode is as follows: [0003] SiO+Li→Li 2 O+Si(1) [0004] SiO+Li→Li 4 SiO 4 +Si(2) [0005] Si+Li→Li 4.4 Si(3) [0006] When SiO is used as a composite material, its first Coulombic efficiency is low, mainly because the first step reactions (Formula 1) and (Formula 2) are irreversible reactions, and the generated Li 2 O. Li 4 SiO 4 And reactions such as the contact decomposition and condensation of silicon oxides and organic electrolytes consume more lithium ions. [0007] Generated Li 2 O. Li 4 SiO 4 Precipitated i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/48H01M4/36H01M10/0525
CPCH01M4/366H01M4/48H01M10/0525Y02E60/10
Inventor 晏荦周豪杰仰韻霖
Owner DONGGUAN KAIJIN NEW ENERGY TECH
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