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A kind of animal bone-based graphene-like lithium-ion battery negative electrode material and preparation method thereof

A technology for lithium ion batteries and negative electrode materials, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of complex graphene preparation process and high cost, and achieve improved electrochemical performance and large interplanar spacing. , the effect of facilitating insertion and extraction

Active Publication Date: 2017-06-06
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the complex preparation process and high cost of graphene are far from meeting the practical needs

Method used

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  • A kind of animal bone-based graphene-like lithium-ion battery negative electrode material and preparation method thereof
  • A kind of animal bone-based graphene-like lithium-ion battery negative electrode material and preparation method thereof
  • A kind of animal bone-based graphene-like lithium-ion battery negative electrode material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] A: Preparation of precursors:

[0035] Under the protection of nitrogen, the pig bone was kept at 450°C for 6 hours for pre-carbonization; the pre-carbonized pig bone and KOH solid powder were mixed evenly at a mass ratio of 1:1, and the temperature was gradually raised to 850°C under the protection of nitrogen. , and kept for 1h, activated carbonization; then naturally cooled to room temperature under the protection of nitrogen, with 1mol / L HNO 3 The solution is acid-washed to remove inorganic salts therein, then washed with deionized water until neutral, and dried to obtain porous carbon.

[0036] B: Graphitization of precursors:

[0037] The specific steps are as follows: 1) Increase the temperature from room temperature to 1000 °C with a heating rate of 25 °C min -1 , keep warm for 30min; 2) Raise the temperature from 1000 to 2000°C at a rate of 20°C min -1 , keep warm for 30min; 3) Raise the temperature from 2000 to 2800°C at a rate of 10°C min -1 , constant te...

Embodiment 2

[0041] The preparation of the animal bone-based graphene-like negative electrode is the same as in Example 1.

[0042] Use lithium sheet as negative electrode, choose polypropylene as diaphragm, choose 1mol L -1 Lithium hexafluorophosphate is used as the electrolyte, and the solvent volume ratio is ethylene carbonate: ethyl methyl carbonate: dimethyl carbonate = 1:1:1, and assembled into a CR2025 button battery. The charge and discharge cut-off voltages are 0.005V and 3V respectively, and the current density is 100mA g -1 Under the following conditions, the specific discharge capacity of the battery increases with the increase of the number of cycles. After 100 cycles, the specific discharge capacity of the battery is 363mAh g -1 , Coulombic efficiency is 99.7%.

Embodiment 3

[0044] A: Preparation of precursors:

[0045] Under the protection of nitrogen, the dried fish scales were kept at 450°C for 6 hours for pre-carbonization; the pre-carbonized fish scales and KOH solid powder were mixed evenly at a mass ratio of 1:1, and the temperature was gradually raised to 850°C under the protection of nitrogen. And keep it for 1h, carry out activated carbonization; then naturally cool to room temperature under the protection of nitrogen, and use 1mol / L HNO 3 The solution is acid-washed to remove inorganic salts therein, then washed with deionized water until neutral, and dried to obtain porous carbon.

[0046] B: Graphitization of precursors:

[0047] The specific steps are as follows: 1) Increase the temperature from room temperature to 1000 °C with a heating rate of 25 °C min -1 , keep warm for 30min; 2) Raise the temperature from 1000 to 2000°C at a rate of 20°C min -1 , keep warm for 30min; 3) Raise the temperature from 2000 to 2800°C at a rate of 1...

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Abstract

The invention relates to an animal bone base type lithium ion battery negative electrode material and a preparation method thereof. Animal bones act as raw materials, are carbonized, activated and graphitized, and are thermally treated at a certain temperature so as to prepare graphite. The specific capacity of the materials is enhanced, and especially the electrochemical performance of the materials at high current density and long cycle is maintained. The electrochemical performance test shows that the animal bone base type lithium ion battery negative electrode material shows excellent electrochemical performance, the specific capacity of the graphite is gradually close to the theory specific capacity along with the increase of the cycle times and the specific capacity.

Description

[0001] Technical field: [0002] The invention relates to an animal bone-based graphene-like lithium-ion battery negative electrode material and a preparation method thereof. [0003] Background technique: [0004] With the advent of the mobile Internet era, the miniaturization of electronic equipment, and the gradual development and application of electric bicycles and new energy vehicles, a higher specific capacity requirement has been put forward for lithium-ion secondary batteries. Lithium-ion batteries are currently the most widely used secondary batteries, but their cycle life and energy density still cannot meet people's requirements. The energy density of lithium-ion batteries depends largely on the electrode potential and reversible specific capacity of the positive and negative electrode materials. Therefore, exploring the negative electrode materials with superior performance is an important topic in the research of lithium-ion batteries. At present, commercial meso...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/583H01M10/0525
CPCH01M4/583H01M10/0525Y02E60/10
Inventor 黄雅钦高梦瑶刘乃强陈溢镭邵洪源其他发明人请求不公开姓名
Owner BEIJING UNIV OF CHEM TECH
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