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A kind of negative pole of sodium ion battery and its preparation method and sodium ion battery

A sodium-ion battery and negative electrode technology, applied in battery electrodes, non-aqueous electrolyte battery electrodes, secondary batteries, etc., can solve red phosphorus composite materials with low tap density, low energy density and power density, and poor high-current charge and discharge capabilities and other issues, to achieve the effect of industrial production properties, high tap density, and good high-current charge and discharge performance

Active Publication Date: 2021-03-23
SHENZHEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In view of the above-mentioned deficiencies in the prior art, the object of the present invention is to provide a negative electrode for a sodium-ion battery and a preparation method thereof and a sodium-ion battery, aiming at solving the problem of the low tap density, energy density and power density of the existing red phosphorus composite material , the problem of poor high current charge and discharge capability

Method used

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  • A kind of negative pole of sodium ion battery and its preparation method and sodium ion battery
  • A kind of negative pole of sodium ion battery and its preparation method and sodium ion battery
  • A kind of negative pole of sodium ion battery and its preparation method and sodium ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] 1. Preparation method of the negative electrode of the sodium ion battery of this example, including the following steps:

[0050] Preparation of nanophenophosphastized materials: High energy ball milling, block commercial red phosphorus ball to nano size, block red phosphorus according to the ball mass ratio 50: 1, the speed is 800 rpm, the ball milling time is 12h, under an inert atmosphere Ball mills, in order to prevent the ball milling process from being too high, ball milling for 5 min, intermittent 5 min.

[0051] Preparation of nanophenophos and graphene composites: a high energy ball milling, a proportion of nanochemant phosphorus and graphene are combined, and nano-phosphorus and graphene have a mass ratio of 2: 1, and the rotational speed is 500 rpm, ball milling time. For 5 h, ball mill was carried out under an inert atmosphere, in order to prevent the ball milling process from being too high, ball milling for 5 min, intermittent 5 min.

[0052] Preparation of n...

Embodiment 2

[0058] Methods of nanopophosphorus, barium titanate, barium titanate and graphene composites, and the method of preparing a plate (i.e., sodium ion battery negative electrode), but only at the surface of the pole, ALD technology is coated with a 10-turn tripodoxide. Aluminum, the specific process is that the aluminum source is trimethyl aluminum, and the oxygen source is water, the reaction cavity temperature is 150 ° C, and the number of reaction is 10 turns.

[0059] Electrochemical performance test is the same as in Example 1. At 2A · G -1 Charge and discharge test under large current densities. The test results show that the composite material also exhibits extremely high mass specific capacity and cycle stability even under large magnification conditions. For example, the initial discharge capacity can reach 1190mAh · g -1 The initial Kurlen efficiency reached 64%. Even after the 50-turn large current charge, the capacity can still be maintained at 500mAh · g -1 about.

Embodiment 3

[0061] Nano-phosphorus, barium titanate and graphene composites and methods of preparing a plate in the coating film are the same as in Example 1, using ALD technology coating the aluminum oxide process as in Example 2, except for the prepared battery pole The barium titanate in the film continues the polarization treatment, placed between the two parallel copper electrodes, performs an insulating treatment, applied 8 kV DC voltage, and performs polarization treatment at room temperature for 24 h.

[0062] Electrochemical performance test is the same as in Example 1. At 2A · G -1 Charge and discharge test under large current densities. The test results show that the composite material also exhibits extremely high mass specific capacity and cycle stability even under large magnification conditions. For example, the initial discharge capacity can reach 925mAh · g -1 The initial Kurun efficiency reached 66%. Even after 50 laps, the capacity can still be maintained at 400mAh · g -1 ab...

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Abstract

The invention discloses a sodium ion battery anode, a preparation method thereof and a sodium ion battery, wherein the method comprises the steps of: using a ball milling method to mill the block redphosphorus ball to nano red phosphorus; using the ball milling method to composite the nano red phosphorus and graphene to obtain a composite material of the nano red phosphorus and graphene; using the ball milling method to composite the composite material of the nano red phosphorus and grapheme and the barium titanate to obtain an active material; and mixing the active material with the bondingmaterial and the conductive agent, thereby obtaining the sodium ion battery anode after being coated, dried, and sliced. The sodium ion battery anode material provided by the invention has good high current charge and discharge performance, high tap density, large mass specific capacity and high energy density.

Description

Technical field [0001] The present invention relates to the field of batteries, and more particularly to a sodium ion battery negative electrode and a preparation method thereof and a sodium ion battery. Background technique [0002] Since the successful realization of commercialization in the 1990s, after more than 20 years of development has been widely used in the field of energy storage, especially portable electronic equipment power supply. In recent years, due to environmental problems such as greenhouse effects caused by fossil resources, human beings that have their own non-renewable people have a broad application prospect for chemical batteries with cleaning renewable attributes, and also chemical batteries. A large number of demands and higher requirements for performance standards are produced. The lithium-ion battery is in a wide variety of chemical cells, since it has high quality specific capacity, high energy density, high power density, high power generation capa...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/13H01M10/054H01M4/139
CPCH01M4/13H01M4/139H01M10/054Y02E60/10
Inventor 米宏伟王营涛张培新
Owner SHENZHEN UNIV
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