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Carbon-based lithium ion battery negative electrode material taking sludge as precursor and preparation of carbon-based lithium ion battery negative electrode material

A technology for ion batteries and anode materials, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of strict requirements on sludge types and components, impossibility of industrial promotion and application, and limited range of sludge selection, so as to improve the reversible capacity And cycle performance, improve lithium intercalation capacity and charge-discharge cycle performance, and easy to operate

Inactive Publication Date: 2017-07-04
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] However, in the existing process, there are strict requirements on the type and composition of sludge, which greatly limits the selection range of sludge, has great limitations, poor versatility, and cannot be popularized and applied in industrialization

Method used

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  • Carbon-based lithium ion battery negative electrode material taking sludge as precursor and preparation of carbon-based lithium ion battery negative electrode material
  • Carbon-based lithium ion battery negative electrode material taking sludge as precursor and preparation of carbon-based lithium ion battery negative electrode material
  • Carbon-based lithium ion battery negative electrode material taking sludge as precursor and preparation of carbon-based lithium ion battery negative electrode material

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Experimental program
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Effect test

Embodiment 1

[0042] The primary sludge was lyophilized for 96 hours and ground into powder, placed in a tube furnace, and carbonized at 500°C for 8 hours under nitrogen protection. The obtained carbon material was ground and mixed in a 10% hydrofluoric acid solution for 4 hours. Distilled water was washed and dried; the carbon material obtained by drying was mixed with potassium hydroxide in a ratio of 1:5, then an appropriate amount of distilled water was added, mixed and stirred for 8 hours, dried and ground, and then placed in a tube furnace under nitrogen protection at 800 °C for carbonization again; the obtained carbon The material was soaked in 5% dilute hydrochloric acid for 10 hours, washed with distilled water and dried, and the obtained carbon material was used as the negative electrode material of lithium ion battery.

[0043] The BET test was performed on the carbon-based lithium-ion battery negative electrode material, and the results were compared with the sludge carbon electr...

Embodiment 2

[0053] The dewatered sludge was lyophilized for 48 hours and then ground into powder, placed in a tube furnace, and placed in a tube furnace under nitrogen protection for carbonization at 550 °C for 6 hours. The obtained carbon material was ground into powder, and then placed in 15% hydrogen Mix and stir in the fluoric acid solution for 4 hours, then wash with distilled water until the solution becomes neutral, and dry; mix the dried carbon material and potassium hydroxide in a ratio of 1:4, and add an appropriate amount of distilled water to submerge the carbon material, mix and stir 7h, dried and ground; then put the carbon material in a tube furnace, and carbonized again at 850°C under nitrogen protection; the obtained carbon material was soaked in 4% dilute hydrochloric acid for 10h, washed with distilled water until the solution was neutral, The obtained carbon material is used as a lithium ion battery negative electrode material.

[0054] After testing, the obtained carb...

Embodiment 3

[0056] The digested sludge was lyophilized for 60 hours and ground into powder, which was placed in a tube furnace, and then placed in a tube furnace under nitrogen protection for carbonization at 500°C for 7 hours. The obtained carbon material was ground into powder, and then placed in 20% hydrofluoric acid. Mix and stir in the acid solution for 4 hours, then wash with distilled water until the solution is neutral, and dry; mix the dried carbon material and potassium hydroxide in a ratio of 1:3 and add an appropriate amount of distilled water to submerge the carbon material, mix and stir for 8 hours, Dry and grind; then put the carbon material in a tube furnace, and carbonize again at 800°C under nitrogen protection; soak the obtained carbon material in 6% dilute hydrochloric acid for 12 hours, and wash it with distilled water until the solution is neutral. Carbon materials use them as anode materials for lithium-ion batteries.

[0057] After testing, the obtained carbon mate...

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Abstract

The invention relates to a carbon-based lithium ion battery negative electrode material taking sludge as a precursor and preparation of the carbon-based lithium ion battery negative electrode material. During preparation, the sludge is carbonized and processed in advance, and the carbon-based lithium ion battery negative electrode material is obtained by sequentially performing washing and drying after pickling and alkali activation. Compared with the prior art, the carbon-based lithium ion battery negative electrode material has the advantages of greenness, environmental friendliness, simple preparation process and low production cost, the resource utilization of the sludge can be achieved, and the prepared carbon-based lithium ion battery negative electrode material is high in specific area and specific capacity and good in cycle property and has wide application prospect.

Description

technical field [0001] The invention belongs to the technical field of electrode material manufacturing, and relates to a carbon-based lithium ion battery negative electrode material using sludge as a precursor and preparation thereof. Background technique [0002] Compared with traditional secondary batteries, lithium-ion batteries have the advantages of high energy, high operating voltage, high safety, and low environmental pollution. Among them, the negative electrode material, as the main body of lithium storage in lithium ion batteries, can realize the insertion and extraction of lithium ions during the charging and discharging process, which is the key to improve the total specific capacity, cycle performance, charge and discharge performance of lithium ion batteries. Among the anode materials, carbon-based anode materials have always occupied a dominant position. Most of the lithium-ion batteries sold use graphitized carbon-based anode materials. However, the theoret...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/587H01M4/36H01M10/0525
CPCH01M4/362H01M4/587H01M10/0525Y02E60/10
Inventor 院士杰范皓翔张佳佳刘银丹胡崇亮戴晓虎
Owner TONGJI UNIV
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