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Biomass charcoal/iron oxide composite material and preparation method thereof

A technology of biomass carbon and composite materials, applied in electrochemical generators, electrical components, battery electrodes, etc., can solve problems such as poor cycle performance, low conductivity of iron oxide, large volume expansion, etc., and achieve low cost and convenient access , the effect of simple equipment

Inactive Publication Date: 2018-12-04
SHANGHAI INST OF QUALITY INSPECTION & TECHN RES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to overcome the disadvantages of low electrical conductivity, poor cycle performance and large volume expansion of existing carbon material composite iron oxide, and propose a biomass carbon / iron oxide composite material and its preparation method

Method used

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  • Biomass charcoal/iron oxide composite material and preparation method thereof
  • Biomass charcoal/iron oxide composite material and preparation method thereof
  • Biomass charcoal/iron oxide composite material and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0030] Clean the collected sycamore leaves with deionized water, then soak 24h with the potassium hydroxide solution of 1mol / L, in the air blast oven for 80 o C evaporated to dryness. Then collect it in a porcelain ark and put it in a tube furnace, the argon gas is 99% pure, the flow rate of argon gas is 30-60ml / min, and the temperature is raised to 900 at a heating rate of 5°C / min. o C, calcined at this temperature for 2h. Then wash with dehydrochloric acid solution and deionized water until the pH of the filtrate is neutral, and put it in a dry box at 80 o C and dried for 10 h, ground and sieved to obtain sycamore leaf biomass carbon. Add 0.4g sycamore leaf biomass carbon material to the NaH with a volume of 400ml and a concentration of 0.054g / L 2 PO 4 aqueous solution, and then add 7.2ml of FeCl with a concentration of 1.5mol / L 3 The solution was transferred to a flask oil bath and stirred and heated for 2 hours. After cooling to room temperature, it was transferred to...

Embodiment 2

[0032] Clean the collected bamboo leaves with deionized water, then soak them in 0.5mol / L potassium hydroxide solution for 48 hours, and dry them in a blast oven for 85 hours. o C evaporated to dryness. Then collect it in a porcelain ark and put it in a tube furnace, the argon gas is 99% pure, the argon gas flow rate is 30-60ml / min, and the temperature is raised to 950 at a heating rate of 5°C / min. o C, calcined at this temperature for 2h. Then wash with dehydrochloric acid solution and deionized water until the pH of the filtrate is neutral, and place it in a dry box at 85 o C for 10 h, ground and sieved to obtain bamboo leaf biomass carbon. Add 0.1g of biomass carbon material to NaH with a concentration of 0.03g / L 2 PO 4 aqueous solution, and then add 10.8ml of FeCl with a concentration of 1mol / L 3 The solution was transferred to a flask oil bath and stirred and heated for 4 hours. After cooling to room temperature, it was transferred to a beaker and placed in a microwa...

Embodiment 3

[0034] The hair and pine bark that the mass ratio of 1:1 that collects is cleaned with deionized water is good, soaks 20h with the potassium hydroxide solution of 1.5mol / L then, in blast drying box 75 oC evaporated to dryness. Then collect it in a porcelain ark and put it in a tube furnace. The argon gas is 99% pure, and the argon gas flow rate is 30-60ml / min. o C, calcined at this temperature for 4h, then. Then wash with dehydrochloric acid solution and deionized water until the pH of the filtrate is neutral, and put it in a dry box at 75 o Dry 20h under C, grind and sieve to obtain hair and pine bark biomass carbon. Add 1.5g of hair and pine bark biomass carbon material to NaH with a concentration of 0.07g / L 2 PO 4 aqueous solution, and then add 3.6ml of FeCl with a concentration of 3mol / L 3 The solution was transferred to a flask oil bath and stirred and heated for 1 hour. After cooling to room temperature, it was transferred to a beaker and placed in a microwave oven ...

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Abstract

The invention discloses a biomass charcoal / iron oxide composite material for a lithium battery negative electrode, and a preparation method thereof in order to solve the problems of large volume expansion ratio and poor cycle performance of a lithium battery negative electrode material iron oxide. The preparation method comprises the following steps: carbonizing leaves, barks, wood chips and / or animal hair to prepare biomass charcoal, compounding the biomass charcoal with iron oxide by a forced hydrothermal process in order to obtain a porous biomass charcoal-coated iron oxide precursor, and performing microwave treatment on the precursor to change the crystallinity of the iron oxide in order to obtain the biomass charcoal / iron oxide composite material. The biomass charcoal / iron oxide composite material prepared in the invention has a low cost, can be directly applied to the electrode materials of lithium ion battery negative electrodes, and has wide practical application values and industrial production prospects.

Description

technical field [0001] The invention belongs to the field of battery key materials and technologies, and in particular relates to a lithium-ion secondary battery negative electrode material and a preparation method thereof, in particular to a biomass carbon / iron oxide composite material and a preparation method thereof. Background technique [0002] Electrode materials with low cost, high energy density and good cycle stability are an important prerequisite for the large-scale application of power batteries in the future. In order to improve battery performance and reduce production prices, it is necessary to develop high-capacity, long-life, and low-price lithium battery anode materials. [0003] Iron oxide has been widely used in various aspects due to its abundant natural resources, low toxicity and excellent performance. In recent years, it has been widely studied due to its excellent electrochemical performance as an anode material for lithium batteries. Many iron oxi...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/48H01M4/583H01M10/0525
CPCH01M4/362H01M4/48H01M4/583H01M10/0525H01M2004/021Y02E60/10
Inventor 杨旭王晨旭陈苏声张丹周怡谢磊雷
Owner SHANGHAI INST OF QUALITY INSPECTION & TECHN RES
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