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Lithium ion battery negative electrode composite material and preparation method thereof

A lithium-ion battery and composite material technology, which is applied in the fields of nitrogen-doped tin-carbon composite material and its preparation, lithium-ion battery negative electrode composite material and its preparation field, can solve the problem that the material integrity is difficult to maintain, the lithium storage space is destroyed, and the lithium storage space is easily damaged. Agglomeration and other problems, to achieve excellent electrochemical performance, inhibit mechanical strain, prevent agglomeration effect

Pending Publication Date: 2021-11-26
DALIAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This can make it harder to maintain the integrity of the material and ultimately lead to the destruction of the lithium storage space
At the same time, the characteristics of tin-based materials such as softness, easy aggregation, and low melting point also bring many challenges to the preparation and research of tin-based anode materials.

Method used

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  • Lithium ion battery negative electrode composite material and preparation method thereof
  • Lithium ion battery negative electrode composite material and preparation method thereof
  • Lithium ion battery negative electrode composite material and preparation method thereof

Examples

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Effect test

Embodiment 1

[0036] A lithium-ion battery negative electrode hollow micro-box structure nitrogen-doped tin-carbon composite material (MB / TC) and a preparation method thereof, specifically comprising the following steps:

[0037] (1)ZnSn(OH) 6 Preparation of:

[0038] 0.273g ZnCl 2 and 0.588g C 6 h 5 Na 3 o 7 2H2O was dissolved in deionized water (20ml), and then the completely dissolved SnCl 4 The ethanol solution (0.2mol / L 10mL) was added to the above solution, and the aqueous solution of NaOH (0.4mol / L 50mL) was added to the mixed solution, and reacted for 30min. The precursor ZnSn(OH) can be obtained through the above solution reaction 6 .

[0039] (2) ZnSnO 3 Preparation of microcassettes:

[0040] In the precursor ZnSn(OH) 6 Add 30mL NaOH solution (2mol / L), stir for 15min, form hollow ZnSn(OH) by alkali etching 6 Then the suspension was centrifuged and dried overnight, and the dried white powder was taken out and put into a tube furnace for dehydration and calcination. ZnSn...

Embodiment 2

[0047] A lithium-ion battery negative electrode hollow micro-box structure nitrogen-doped tin-carbon composite material (MB / TC) and a preparation method thereof, specifically comprising the following steps:

[0048] (1) Precursor ZnSn(OH) 6 Preparation of:

[0049] 0.280g ZnCl 2 and 0.600g C 6 h 5 Na 3 o 7 2H2O was dissolved in deionized water (30ml), and then the completely dissolved SnCl 4 The ethanol solution (0.2mol / L 20mL) was added to the above solution, and the aqueous solution of NaOH (0.4mol / L 60mL) was added to the mixed solution and reacted for 40min. The precursor ZnSn(OH) can be obtained through the above solution reaction 6 .

[0050] (2) ZnSnO 3 Preparation of microcassettes:

[0051] In the precursor ZnSn(OH) 6 Add 40mL NaOH solution (2mol / L), stir for 20min, form hollow ZnSn(OH) by alkali etching 6 Then the suspension was centrifuged and dried overnight, and the dried white powder was taken out and put into a tube furnace for dehydration and calcin...

Embodiment 3

[0055] A lithium-ion battery negative electrode hollow micro-box structure nitrogen-doped tin-carbon composite material (MB / TC) and a preparation method thereof, specifically comprising the following steps:

[0056] (1) Precursor ZnSn(OH) 6 Preparation of:

[0057] 0.270g ZnCl 2 and 0.580g C 6 h 5 Na 3 o 7 2H2O was dissolved in deionized water (10ml), and then the dissolved SnCl 4 The ethanol solution (0.2mol / L 5mL) was added to the above solution, and the aqueous solution of NaOH (0.4mol / L 40mL) was added to the mixed solution and reacted for 20min. The precursor ZnSn(OH) can be obtained through the above solution reaction 6 .

[0058] (2) ZnSnO 3 Preparation of microcassettes:

[0059] In the precursor ZnSn(OH) 6 Add 30mL NaOH solution (2mol / L), stir for 10min, form hollow ZnSn(OH) by alkali etching 6 Then the suspension was centrifuged and dried overnight, and the dried white powder was taken out and put into a tube furnace for dehydration and calcination. ZnSn...

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Abstract

The invention belongs to the field of lithium ion batteries, and discloses a lithium ion battery negative electrode composite material and a preparation method thereof. A ZnSnO3 microbox is used as a precursor, a SnO2 / ZIF-8 microbox is synthesized in situ on the precursor through a hydrothermal reaction, and then the material is reduced into an MB / TC composite material with Sn nanoparticles coated with a nitrogen-doped carbon skeleton through calcination pyrolysis, and the MB / TC composite material is used as a negative electrode material. The composite material is expected to enable a lithium ion battery to have high specific capacity with extremely high stability, and is a successful strategy for improving the electrochemical performance of the lithium ion battery.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and relates to a lithium ion battery negative electrode composite material and a preparation method thereof. In particular, it relates to a nitrogen-doped tin-carbon composite material (MB / TC) with a negative electrode hollow micro-box structure for a lithium ion battery and a preparation method thereof. Background technique [0002] At present, the demand for energy in society is increasing, and the proportion of energy in production and life is gradually increasing. With the development of industry, the consumption of traditional energy has also increased sharply, and the cost of use has also increased significantly. Therefore, the development of new energy is imminent, and chemical power sources are prominent in the field of new energy due to their good cycle performance, high energy density, and good operability. Nowadays, with the rapid replacement of portable electronic prod...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/62H01M10/0525
CPCH01M4/362H01M4/387H01M4/62H01M4/625H01M4/628H01M10/0525Y02E60/10
Inventor 那兆霖李文静刘旭东惠宇王兴安刘洋杨澳宇
Owner DALIAN UNIV
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