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Graphene-like coated iron-based compound doped cathode material and preparation method thereof

A graphene-coated, negative electrode material technology, applied in battery electrodes, electrical components, circuits, etc., can solve the problems of cumbersome operation, difficult to control product components, poor electrochemical performance, etc., to achieve simple operation, reduce irreversible reactions, low cost effect

Active Publication Date: 2011-11-16
SHENZHEN EIGEN EQUATION GRAPHENE TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The traditional preparation of carbon-coated doped iron oxide composite powders uses physical means such as arc discharge technology, laser evaporation, chemical deposition, direct thermal decomposition of metal organics, etc. These methods often use toxic or expensive precursors and Organic solvents with high boiling points, and the equipment used is complex, energy-consuming, costly, cumbersome to operate, and violently reactive, making it difficult to achieve large-scale production
These reactions often only get the main product of a single iron oxide component, and it is difficult to control the product component; moreover, the obtained carbon is mostly amorphous structure, and its electrochemical performance is relatively poor

Method used

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  • Graphene-like coated iron-based compound doped cathode material and preparation method thereof
  • Graphene-like coated iron-based compound doped cathode material and preparation method thereof
  • Graphene-like coated iron-based compound doped cathode material and preparation method thereof

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Effect test

Embodiment 1

[0044] (1) Weigh 1 g of self-made iron oxide Fe with a particle size of 16 nm 3-x o 4 The powder was ground and mixed with 0.05 g of acrylonitrile oligomer, and cured at a constant temperature at 220 °C for 2 hours in an air atmosphere to obtain a precursor.

[0045] (2) The precursor obtained in step (1) was ball-milled for 24 hours in a planetary ball mill with a ball-to-material ratio of 10 : 1, 400 r / min, and then calcined at 300 °C for 1 hour under the protection of nitrogen, and then continued Sintering at 500°C for 8 hours, the acrylonitrile oligomer is sintered to form a graphene-like coating layer on the surface of the particles. Since less acrylonitrile oligomer is added, the sintering time is shorter, and the oxide is not reduced to iron. to produce Fe 3-x o 4 / C composite powder.

Embodiment 2

[0047] (1) Weigh 1 g of iron oxide Fe with a particle size of 20 nm 3-x o 4 The powder was ground and mixed with 0.12 g of acrylonitrile oligomer, and cured at a constant temperature at 180 °C for 4 hours in an air atmosphere to obtain a precursor.

[0048] (2) The precursor obtained in step (1) was ball-milled for 24 hours in a planetary ball mill with a ball-to-material ratio of 10 : 1, 400 r / min, and then calcined at 300 °C for 1 hour under the protection of nitrogen, and then continued The temperature was raised to 600 °C for 6 hours, and the acrylonitrile oligomer was sintered to form a graphene-like coating layer on the particle surface, and a small amount of Fe 3-x o 4 reduced to simple substance α -Fe, get Fe 3-x o 4 / Fe / C composite powder.

Embodiment 3

[0050] (1) Weigh commercially available iron oxide with a particle size of 250 nm α -Fe 2 o 3 2 g of powder and 0.4 g of acrylonitrile oligomer were ground and mixed evenly, and cured at a constant temperature for 4 hours at 180 °C in an air atmosphere to obtain a precursor.

[0051] (2) The precursor obtained in step (1) was ball milled in a planetary ball mill with a ball-to-material ratio of 10 : 1, 400 r / min for 24 hours, then calcined at 300 °C for 1 hour under the protection of argon, and then Continue to heat up to 700 ° C for 2 hours, the acrylonitrile oligomer is sintered to form a graphene-like coating on the surface of the particle, and α -Fe 2 o 3 All reduced to Fe 3-x o 4 , get Fe 3-x o 4 / C composite powder.

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Abstract

The invention discloses a graphene-like coated iron-based compound doped cathode material and a preparation method thereof. The composite powder can be used as the cathode material of a lithium ion battery. The preparation method comprises the following steps: A, uniformly mixing the solution containing liquid oligoacrylonitrile and ferric oxide powder; and drying and curing at a low temperature to obtain a precursor; and B, grinding and crushing the precursor obtained in the step A, and performing the processes of high-temperature sintering and the like to obtain the graphene-like coated iron-based material doped composite powder with multiple components. The preparation method disclosed by the invention has low cost, is easy to operate and can prepare the graphene-like coated composite material doped with a single or multi-component iron-based material disclosed by the invention; and the lithium ion battery made from the composite material has large charge / discharge capacity and excellent high-rate charge / discharge performance.

Description

technical field [0001] The invention relates to the field of lithium ion battery materials, in particular to a lithium ion battery negative electrode material and a preparation method thereof. Background technique [0002] With high energy density, light weight and long service life, lithium-ion batteries are a very promising new energy source, especially in the field of mobile applications, such as: laptops, cameras, mobile phones, etc. Since Sony first commercialized it in 1991, the anode materials of commercialized secondary lithium-ion batteries all use graphite as the anode, which has high Coulombic efficiency (> 90 %), but the theoretical capacity is relatively low, In order to meet the rapidly increasing specific capacity requirements of Li-ion batteries in various application fields, exploring new and higher-capacity anode materials has become a key issue in the development of Li-ion batteries. [0003] Iron-based oxide is a high-capacity lithium-ion battery anod...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/1391H01M4/525
CPCY02E60/122Y02E60/12Y02E60/10
Inventor 刘剑洪陈亮张黔玲贵大勇何传新朱才镇
Owner SHENZHEN EIGEN EQUATION GRAPHENE TECH CO LTD
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