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Method for preparing spherical lithium/sodium battery negative electrode carbon material

A sodium battery and carbon material technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of high cost and heavy pollution, and achieve the effects of improving service life, simple preparation process, and improving performance

Inactive Publication Date: 2016-06-08
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, at present, most of the battery negative electrode materials are tin-based materials, lithium-containing transition metal nitrides, and alloys, which have the disadvantages of large pollution and high cost.

Method used

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  • Method for preparing spherical lithium/sodium battery negative electrode carbon material
  • Method for preparing spherical lithium/sodium battery negative electrode carbon material
  • Method for preparing spherical lithium/sodium battery negative electrode carbon material

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preparation example Construction

[0030] A preparation method of spherical lithium / sodium battery negative electrode carbon material, comprising the following steps:

[0031] Step 1: The raw materials are washed, mechanically crushed, and dried at 105°C for 24 hours after being crushed to 1-3 mm; the raw materials are rape husks, rape stalks, rice husks, rice straw, wheat husks, wheat straw, corn stalks, and corn husks , corn cobs or ears of corn;

[0032] Step 2: immerse the dried raw material in a nitric acid solution with a mass concentration of 5-30%, and stir magnetically for 1-48 hours to obtain the solution; wherein, the ratio of the dried raw material to the nitric acid solution is (1.0-3.0) g: 50mL.

[0033] Step 3: Transfer the solution to a polytetrafluoroethylene high-pressure hydrothermal kettle, and conduct a hydrothermal reaction at 120-180°C for 12-24 hours at a speed of 10r / min. The precipitate was washed several times with deionized water and ethanol, and dried at 60°C to obtain the product...

Embodiment 1

[0040] (a) Wash the collected rapeseed shells with deionized water, cut them into 1-3mm pieces, and dry them at 105°C for later use;

[0041] (b) immerse 2.0 g of rape shells in step (a) in 50 mL of nitric acid solution with a mass concentration of 10%, and magnetically stir for 1 h to form a solution;

[0042] (c) Then transfer the solution to a polytetrafluoroethylene high-pressure hydrothermal kettle, and conduct a hydrothermal reaction at 180°C for 24 hours at a speed of 10r / min. After the reaction is complete, cool it to room temperature with the furnace, and wash the precipitate with deionized water and ethanol for several times, and dried at 60°C to obtain the product;

[0043] (d) Put the product in a porcelain boat, carbonize it in an atmosphere furnace, and heat it at 700° C. for 2 hours at a heating rate of 5° C. / min under an argon atmosphere (the argon flow rate is 50 sccm) to obtain a carbonized product;

[0044] (e) further magnetically stirring the carbonized p...

Embodiment 2

[0051] (a) Wash the collected wheat husks with deionized water, cut them into 1-3mm pieces, and dry them at 105°C for later use;

[0052] (b) Soak 3.0 g of wheat husks in 50 mL of 20% nitric acid solution, and stir magnetically for 12 hours to form a solution;

[0053] (c) Then transfer the solution to a polytetrafluoroethylene high-pressure hydrothermal kettle, and conduct a hydrothermal reaction at 180°C for 24 hours at a speed of 10r / min. After the reaction is complete, cool it to room temperature with the furnace, and wash the precipitate with deionized water and ethanol for several times, and dried at 60°C to obtain the product;

[0054] (d) Put the product into a porcelain boat, carbonize it in an atmosphere furnace, and heat it at 600° C. for 2 hours at a heating rate of 10° C. / min under an argon atmosphere (the argon gas flow is 100 sccm) to obtain a carbonized product;

[0055] (e) further treating the carbonized product in a 10% KOH solution at 80° C. for 2 hours, a...

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Abstract

The invention provides a method for preparing a spherical lithium / sodium battery negative electrode carbon material. The method includes the steps that raw materials are washed, crushed and then dried; the dried raw materials are soaked in a salpeter solution, after the mixture is stirred, a hydrothermal reaction is conducted for 12-24 hours at the temperature of 120-180 DEG C, then the mixture is cooled to the room temperature along with a furnace, and a product is obtained; the product is placed into a porcelain boat and carbonized in an atmosphere oven, then the temperature is raised to 500-1,000 DEG C under a protection atmosphere, heat preservation is conducted for 2-5 hours, then purification is conducted through a KOH solution and a hydrochloric acid solution, and the spherical lithium / sodium battery negative electrode carbon material is obtained. A lithium / sodium ion battery assembled by the carbon material prepared through the method can represent high cycle performance under the high current density, and irreversible de-intercalation of work ions of the battery under a large current is greatly prolonged, so that the service life of the battery is prolonged, and by the adoption of the method, the raw material source is wide, the preparation process is simple, and industrialization is easy to realize.

Description

technical field [0001] The invention belongs to the technical field of battery materials, and relates to a method for preparing a negative electrode carbon material of a spherical lithium / sodium battery. Background technique [0002] With the progress of sustainable development, in order to replace oil with electricity, ease the pressure of mineral energy, and reduce urban pollution, the development of electric vehicles has become a top priority, and the key to electric vehicles is batteries. At present, lithium-ion batteries with small size, light weight, small self-discharge and high specific energy have been widely used and are gradually replacing traditional batteries. But the system still has some problems that need to be solved, such as poor security performance and high cost. With the advent of the era of electric vehicles and smart grids, global lithium resources will not be able to effectively meet the huge demand for power lithium-ion batteries, which will further...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/587H01M10/0525H01M10/054C01B31/02
CPCH01M4/587H01M10/0525H01M10/054Y02E60/10
Inventor 曹丽云惠文乐许占位黄剑锋李嘉胤费杰介燕妮欧阳海波
Owner SHAANXI UNIV OF SCI & TECH
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