A method for preparing rice husk-based negative electrode material

A negative electrode material and rice husk technology, which is applied in the field of preparing rice husk-based negative electrode materials, can solve the problems of small expansion coefficient and poor conductivity, and achieve the effects of simple method, low raw material cost, and improved Coulombic efficiency

Active Publication Date: 2022-03-08
JILIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] (1) Although the expansion coefficient of lithium ions is smaller than that of silicon during the process of intercalating lithium ions into silicon dioxide, it still needs a certain expansion space
[0011] (2) Compared with graphite, both carbon and silicon dioxide have the disadvantage of poor electrical conductivity, which restricts the application of carbon and silicon dioxide composite materials as negative electrode materials

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Step 1: sieve the raw rice husk to remove impurities, crush it until the particle size is 10mm-20mm, and set aside;

[0036] Step 2: Add the pulverized rice husks into the reaction kettle, add a sulfuric acid solution with a concentration of 3wt% according to the ratio of 1Kg:10L on a dry basis, heat up to 120°C, and catalyze the hydrolysis for 1 hour to prepare wood with a concentration of 12wt%. Aqueous sugar solution and hydrolyzed residue;

[0037] Step 3: Add 2 mol / L catalyst sulfuric acid solution into the reactor, pass nitrogen gas at 200°C at the bottom of the reactor to heat the catalyst solution to reflux, then add NaCl to saturation, and stir to form a catalyst with a fixed concentration and co-catalyst Rotate the liquid surface, then spray the xylose solution with a concentration of 12 wt% into the reactor at a certain speed, and carry out xylose dehydration reaction at the liquid surface layer to produce furfural;

Embodiment 2

[0039] Step 1: Uniformly mix the hydrolyzed slag obtained in Step 2 of Example 1 with zinc chloride at a weight ratio of 1:2 on a dry basis, add it into a sagger, place it in a tube furnace, heat up to 600°C, and activate for 1.5 hours , lowered to room temperature and discharged, soaked in 0.5M hydrochloric acid solution for 6 hours, filtered, washed with water until there were no chloride ions, and dried at 110°C to prepare the primary negative electrode material;

[0040] Step 2: Mix the primary negative electrode material with the electrode pitch / ethanol suspension, stir and disperse for 0.5h-1h, heat and recover the liquid, put the solid in a drying oven, and dry at 85°C for 5h-12h to prepare the pitch / primary negative electrode material mixture powder;

[0041] Step 3: Transfer the pitch / primary anode material mixed powder to a tube furnace, heat up to 200°C for 1 hour under the protection of nitrogen, then heat up to 800°C for 1 hour, cool down, break up, and prepare C / ...

Embodiment 3

[0043] According to the mass ratio of 2:10, the primary negative electrode material prepared in step 1 in Example 2 is uniformly mixed with the electrode pitch powder, pulverized and dispersed by a jet mill until the particle size of the primary negative electrode material is 10 μm-15 μm, and the uniformly mixed pitch / primary The mixed powder of the negative electrode material was transferred to a tube furnace, and under the protection of nitrogen, the temperature was raised to 200°C for 1 hour of constant temperature heat treatment, and then the temperature was raised to 800°C for 1 hour of constant temperature heat treatment.

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Abstract

A method for preparing a rice husk-based negative electrode material, belonging to the field of biomass energy chemical industry, the specific steps are: (1) pulverizing the rice husk and hydrolyzing it with dilute acid at 100°C-120°C for 0.5h-1h to prepare xylose solution and hydrolyzed slag ; (2) The hydrolysis slag is impregnated with zinc chloride and activated to prepare the primary negative electrode material; (3) The C / SiO2 porous negative electrode material is prepared by modifying the electrode pitch. Compared with the prior art, the advantages of the method of the present invention are as follows: (1) using rice husk as a raw material, using dilute acid hydrolysis pretreatment, regulating the ratio of carbon and silicon, and solving the problem of inner and outer silicon dioxide in pyrolytic carbon. The distribution of carbon and carbon is not uniform, and there are large pieces of carbon in the inner layer. Due to the different microstructure, the problem of lithium intercalation and delithiation is not synchronized to reduce the specific capacity; (2) the use of pitch to treat the primary negative electrode material improves the conductivity; The carbon structure improves the anti-powdering ability; the surface functional groups are covered to avoid leakage current and improve cycle stability.

Description

technical field [0001] The invention belongs to the field of biomass energy chemical industry, and specifically discloses a method for preparing a rice husk-based negative electrode material. Background technique [0002] Currently, due to the shortage of petroleum fuels, environmental crisis and increasing energy consumption, researchers are motivating researchers to find cleaner and better electrochemical energy conversion systems. Among these systems, as a novel energy source, lithium-ion batteries (LIBs) have attracted comprehensive attention due to their high energy density, good cycle performance, and long cycle life. Therefore, LIBs can meet the development of electric vehicles and plug-in hybrid electric vehicles. [0003] From the perspective of negative electrode materials, as the negative electrode of LIBs, the theoretical specific capacity of current commercial graphite is low at 372mAh.g-1, which has become a limitation for its wider application. [0004] In t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/48H01M4/62H01M10/0525
CPCH01M4/366H01M4/483H01M4/625H01M4/628H01M10/0525H01M2004/021H01M2004/027Y02E60/10
Inventor 王晓峰丰祎朱燕超杨晓敏王子忱
Owner JILIN UNIV
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