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High-energy-density iron-based lithium ion battery negative electrode material and preparation method thereof

A lithium-ion battery, high energy density technology, applied in battery electrodes, secondary batteries, chemical instruments and methods, etc., can solve the problems of high crystallinity and purity, achieve high specific capacity, stable cycle performance, and excellent electrochemical performance Effect

Inactive Publication Date: 2021-02-26
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to provide a new high-energy-density iron-based lithium-ion battery negative electrode material and its preparation method for many problems of the existing lithium-ion battery negative electrode materials; the present invention discovers the iron-based composite oxide material α-LiFe for the first time 5 o 8 It can be used as a negative electrode material in lithium-ion batteries, and has the advantages of high initial discharge specific capacity, good cycle performance, and long cycle life; at the same time, the lithium-ion battery negative electrode material is prepared by combining liquid phase reaction at room temperature with high-temperature sintering , with spinel structure, uniform particle size, high crystallinity and purity

Method used

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  • High-energy-density iron-based lithium ion battery negative electrode material and preparation method thereof
  • High-energy-density iron-based lithium ion battery negative electrode material and preparation method thereof
  • High-energy-density iron-based lithium ion battery negative electrode material and preparation method thereof

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Embodiment 1

[0030] This embodiment provides a high energy density iron-based lithium-ion battery negative electrode material: spinel type α-LiFe 5 o 8 The preparation method, its process such as figure 1 Shown; With ferric nitrate nonahydrate and lithium hydroxide as iron source and lithium source respectively, dehydrated alcohol is as solvent medium; Specifically comprise the following steps:

[0031] First, dissolve 0.10 mol of ferric nitrate nonahydrate and 1.50 mol of lithium hydroxide in 600 ml of absolute ethanol, and continue stirring at room temperature for 2 hours to obtain a reddish-brown suspension solution;

[0032] Then, the suspended solution was centrifuged to obtain a solid, which was repeatedly and alternately washed with deionized water and absolute ethanol to obtain a reddish-brown solid, and then dried in a blast drying oven at 100°C for 12 hours;

[0033] Finally, the dried red-brown solid was fully ground into powder with an agate mortar, then transferred to a cera...

Embodiment 2

[0036] This embodiment provides a high energy density iron-based lithium-ion battery negative electrode material: spinel type α-LiFe 5 o 8 The preparation method uses ferric nitrate nonahydrate and lithium nitrate as iron source and lithium source respectively, and dehydrated alcohol is as solvent medium; Specifically comprises the following steps:

[0037] First, dissolve 0.10 mol of ferric nitrate nonahydrate and 2.00 mol of lithium nitrate in 600 ml of absolute ethanol, and continue stirring at room temperature for 3 hours to obtain a reddish-brown suspension;

[0038] Then, the suspended solution was centrifuged to obtain a solid, which was alternately washed with deionized water and absolute ethanol to obtain a reddish-brown solid, and then dried in a blast drying oven at 120°C for 24 hours;

[0039] Finally, the dried red-brown solid was fully ground into powder with an agate mortar, then transferred to a ceramic boat and placed in a tube furnace, and sintered at 750 °C...

Embodiment 3

[0042] This embodiment provides a high energy density iron-based lithium-ion battery negative electrode material: spinel type α-LiFe 5 o 8 The preparation method, ferric trichloride hexahydrate and lithium hydroxide are respectively used as iron source and lithium source, and dehydrated alcohol is used as solvent medium; Specifically comprises the following steps:

[0043] First, dissolve 0.10 mol of ferric chloride hexahydrate and 2.00 mol of lithium hydroxide in 600 ml of absolute ethanol, and continue stirring at room temperature for 3 hours to obtain a reddish-brown suspension solution;

[0044] Then, the suspended solution was centrifuged to obtain a solid, which was washed alternately with deionized water and absolute ethanol repeatedly to obtain a reddish-brown solid, and then dried in a blast drying oven at 120°C for 20 hours;

[0045] Finally, the dried red-brown solid was fully ground into powder with an agate mortar, then transferred to a ceramic boat and placed in...

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Abstract

The invention belongs to the technical field of lithium ion battery negative electrode materials and preparation thereof, and particularly provides a high-energy-density iron-based lithium ion batterynegative electrode material and a preparation method thereof, wherein the chemical expression of the lithium ion battery negative electrode material is alpha-LiFe5O8, and the crystalline phase structure of the lithium ion battery negative electrode material is a spinel type structure. According to the invention, it is found for the first time that the iron-based composite oxide material alpha-LiFe5O8 can be applied to a lithium ion battery to serve as a negative electrode material, has excellent electrochemical performance and has the characteristics of high specific capacity and high energydensity; when the charge-discharge rate is 0.1 C, the first specific discharge capacity of the spinel type negative electrode material can reach 2918.25 mAh / g; the single-phase nanoscale spinel type alpha-LiFe5O8 with good crystallization quality and uniform size is prepared by adopting a method of combining normal-temperature liquid-phase reaction with high-temperature sintering; and the preparation process is easy to control, special equipment requirements are avoided, the preparation process is simple and feasible, the used raw materials are cheap, non-toxic and pollution-free, and large-scale industrial production requirements can be met.

Description

technical field [0001] The invention belongs to the technical field of lithium-ion battery negative electrode materials and their preparation, and in particular relates to a lithium-ion battery negative electrode material and a preparation method thereof. The material has the following chemical formula: α-LiFe 5 o 8 . Background technique [0002] Traditional non-renewable fossil energy such as oil, coal and natural gas are being consumed in large quantities with the continuous deepening of the modern industrial process. Due to the limited environmental carrying capacity, fossil energy can no longer meet people's increasing diversified demand for energy; At the same time, CO produced by fossil energy 2 , SO 2 、H 2 S, etc. have caused serious pollution to the environment, and the greenhouse effect caused by it has become a major environmental problem faced by human beings. Lithium-ion battery, as a kind of green and environment-friendly secondary battery with excellent p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/525H01M10/0525C01G49/00
CPCC01G49/0027C01P2002/72C01P2004/03C01P2004/04C01P2006/40H01M4/525H01M10/0525Y02E60/10
Inventor 刘兴泉胡友作何泽珍
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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