Flexible self-supporting 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 problems such as reduced battery life, reduced negative electrode conductivity, and increased internal resistance of batteries, so as to increase load capacity and improve Stability, the effect of reducing the internal resistance of the battery

Active Publication Date: 2019-03-26
XIAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, adding too much dispersant and binder to the negative electrode slurry will easily lead to a decrease in the conductivity of the negative electrode, resulting in an increase in the internal resistance of the battery, thereby reducing the service life of the battery

Method used

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  • Flexible self-supporting lithium ion battery negative electrode material and preparation method thereof
  • Flexible self-supporting lithium ion battery negative electrode material and preparation method thereof
  • Flexible self-supporting lithium ion battery negative electrode material and preparation method thereof

Examples

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Effect test

Embodiment 1

[0035] The preparation method of the lithium ion battery negative electrode material of the present embodiment comprises the following steps:

[0036] Step 1, 0.7g FeCl 3 ·6H 2 O and 0.45g (NH 4 ) 2 C 2 o 4 ·H 2 O was fully dissolved in 50mL by DMF and H 2 The iron precursor solution is obtained in the solution mixed with O, and the iron precursor solution is used as the electrolyte, the nickel foam is used as the working electrode, and the platinum sheet is used as the counter electrode at a current density of 7.8mA / cm 2 Under the conditions of constant current electrodeposition for 30min, the nickel foam after constant current electrodeposition was dried and placed in a tube furnace, and was calcined at 5°C / min to 500°C for 2h under the condition of air atmosphere to obtain Fe 2 o 3 Self-supporting substrate; DMF and H in the mixed solution 2 The volume ratio of O is 2:1;

[0037] Step 2: Add 100 mg of Taixi anthracite coal powder with a particle size of no more t...

Embodiment 2

[0044] The preparation method of the lithium ion battery negative electrode material of the present embodiment comprises the following steps:

[0045] Step 1, 0.7g FeCl 3 ·6H 2 O and 0.45g (NH 4 ) 2 C 2 o 4 ·H 2 O was fully dissolved in 50mL by DMF and H 2 The iron precursor solution is obtained in the solution mixed with O, and the iron precursor solution is used as the electrolyte, the nickel foam is used as the working electrode, and the platinum sheet is used as the counter electrode at a current density of 7.8mA / cm 2 Under the conditions of constant current electrodeposition for 30min, the nickel foam after constant current electrodeposition was dried and placed in a tube furnace, and was calcined at 5°C / min to 450°C for 2h under the condition of air atmosphere to obtain Fe 2 o 3 Self-supporting substrate; DMF and H in the mixed solution 2 The volume ratio of O is 1:1;

[0046] Step 2: Add 100mg of Taixi anthracite coal powder into a round bottom flask containi...

Embodiment 3

[0049] The preparation method of the lithium ion battery negative electrode material of the present embodiment comprises the following steps:

[0050] Step 1, 0.6g FeCl 3 ·6H 2 O and 0.45g (NH 4 ) 2 C 2 o 4 ·H 2 O was fully dissolved in 50mL by DMF and H 2 The iron precursor solution is obtained in the solution mixed with O, and the iron precursor solution is used as the electrolyte, the nickel foam is used as the working electrode, and the platinum sheet is used as the counter electrode at a current density of 9.1mA / cm 2 Under the conditions of constant current electrodeposition for 20min, the nickel foam after constant current electrodeposition was dried and placed in a tube furnace, and it was calcined at 3°C / min to 450°C for 2h under the condition of air atmosphere to obtain Fe 2 o 3 Self-supporting substrate; DMF and H in the mixed solution 2 The volume ratio of O is 3:1;

[0051] Step 2: Add 50mg of Taixi anthracite coal powder into a round-bottomed flask cont...

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Abstract

The invention discloses a flexible self-supporting lithium ion battery negative electrode material which comprises foamed nickel and an active ingredient Fe2O3 attached to the surface of the foamed nickel. The foamed nickel presents a three-dimensional porous mesh framework structure; the Fe2O3 grows on the surface of the foamed nickel in situ and in the pore channel of the three-dimensional porous mesh framework structure, and presents a nano 'deer-horm-shaped' structure; and coal-based graphene carbon quantum dots are coated on the surface of the nano Fe2O3. The invention further discloses apreparation method of the flexible self-supporting lithium ion battery negative electrode material. The method comprises the following steps: growing Fe2O3 in situ on the foamed nickel by adopting anelectro-deposition technology, and coating the coal-based graphene carbon quantum dots on the surface of the Fe2O3. According to the material disclosed by the invention, the foamed nickel serves as the framework, usage of an adhesive or a dispersing agent is avoided, the conductivity of the material is improved, and volume expansion of the Fe2O3 in the charging and discharging process is effectively inhibited by taking CGQDs as the coating material; and the preparation method disclosed by the invention is simple and high-efficiency.

Description

technical field [0001] The invention belongs to the technical field of lithium-ion battery electrode material preparation, and in particular relates to a flexible self-supporting lithium-ion battery negative electrode material and a preparation method thereof. Background technique [0002] As a new type of high-efficiency electric energy storage and conversion device, lithium-ion battery has the advantages of high specific energy, low self-discharge rate, long cycle life, strong environmental adaptability, and environmental protection. and other fields show broad application prospects. At present, commercial lithium-ion batteries mainly use artificial graphite and other carbon materials as negative electrodes, but due to their low theoretical capacity (372mAh / g) and poor safety, the further development of lithium-ion batteries is restricted. [0003] In recent years, transition metal oxide materials have developed into a new type of anode material for lithium-ion batteries ...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/52H01M4/62H01M10/0525
CPCH01M4/364H01M4/523H01M4/626H01M4/628H01M10/0525Y02E60/10
Inventor 张亚婷李可可任绍昭张凯博刘国阳邱介山
Owner XIAN UNIV OF SCI & TECH
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