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Preparation method of Zn2SiO4 lithium ion battery negative electrode with high rate and long cycle stability

A lithium-ion battery, long-cycle technology, applied to battery electrodes, active material electrodes, negative electrodes, etc., can solve the problems of poor long-term cycle stability and achieve the effects of improved cycle stability, high adhesion, and ease of volume expansion

Pending Publication Date: 2022-04-19
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Description
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Problems solved by technology

[0006] In order to overcome the deficiencies of the prior art, the present invention provides a Zn with high rate and long cycle stability 2 SiO 4 The preparation method of lithium-ion battery negative pole can be simple and quick to increase Zn 2 SiO 4 Lithium-ion battery cycle stability, solved Zn 2 SiO 4 The problem of poor long-term cycle stability of nanomaterials with high magnification can meet the requirements of future new energy electric vehicles

Method used

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  • Preparation method of Zn2SiO4 lithium ion battery negative electrode with high rate and long cycle stability
  • Preparation method of Zn2SiO4 lithium ion battery negative electrode with high rate and long cycle stability
  • Preparation method of Zn2SiO4 lithium ion battery negative electrode with high rate and long cycle stability

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Embodiment 1

[0037] In this example, Zn with high rate and long cycle stability 2 SiO 4 The preparation method of lithium ion battery negative electrode is as follows:

[0038] (1) First, Zn 2 SiO 4 Preparation of nanospheres: 7.66 g of zinc acetate dihydrate was dissolved in 32 mL of deionized water, 2.5 mL of tetraethyl orthosilicate was dispersed in 18 mL of absolute ethanol; then, the ethanol solution of tetraethyl orthosilicate was slowly Pour it into the zinc acetate solution, transfer it to a Teflon-lined reaction kettle, put it into a microwave workstation, keep it warm at 180°C for 0.5h, and after cooling, wash and dry it to obtain a white precipitate. Such as figure 1 As shown, get Zn 2 SiO 4 As a pure phase, the synthesized Zn 2 SiO 4 It is a spherical particle with a diameter of about 100 nanometers, such as figure 2 shown.

[0039] (2) Carbon coated Zn 2 SiO 4 Preparation of nanospheres: Zn 2 SiO 4 The nanospheres and sucrose were ground and mixed according to t...

Embodiment 2

[0042] In this example, Zn with high rate and long cycle stability 2 SiO 4 The preparation method of lithium ion battery negative electrode is as follows:

[0043] The only difference from Example 1 is that 0.1wt% of aqueous single-walled carbon nanotubes are added. Zn 2SiO 4 @C The powdered Zn is well wrapped in polyacrylic acid 2 SiO 4 nanospheres, while single-walled carbon nanotubes are able to convert pulverized Zn 2 SiO 4 The nanospheres are connected to solve the problem of electrical conductivity between particles while alleviating the volume expansion, showing excellent electrochemical performance: such as Figure 8 shown, at 0.1A g -1 Under the current density, the charging specific capacity reaches 684mAh g -1 , even at up to 5A g -1 Under the current density, the charge specific capacity remains at 496mAh g -1 , which is much higher than the theoretical specific capacity of 372mAh g of current commercialized graphite -1 . Such as Figure 9 As shown, t...

Embodiment 3

[0045] In this example, Zn with high rate and long cycle stability 2 SiO 4 The preparation method of lithium ion battery negative electrode is as follows:

[0046] (1)Zn 2 SiO 4 Preparation of nanospheres: same as step (1) in Example 1, except that the microwave-assisted heating temperature is 170° C. for 1 hour.

[0047] (2) Carbon coated Zn 2 SiO 4 Preparation of nanospheres: same as step (2) in Example 1, except that dextrin is selected as the carbon source.

[0048] (3)Zn 2 SiO 4 Preparation of battery negative electrode material: same as step (3) in Example 1, except adding 0.05 wt% aqueous single-walled carbon nanotubes.

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Abstract

The invention relates to the field of lithium ion batteries, in particular to a preparation method of a Zn2SiO4 lithium ion battery negative electrode with high rate and long cycle stability. Lithium polyacrylate which is high in adhesion, excellent in mechanical property and beneficial to lithium ion migration is selected as a binder, and a single-walled carbon nanotube which is high in specific surface area, large in length-diameter ratio and high in conductivity is selected as an additive; the preparation method comprises the following steps: carrying out carbon coating on Zn2SiO4 subjected to microwave-assisted solvothermal synthesis through a carbon coating technology, preparing the carbon-coated Zn2SiO4, a binder lithium polyacrylate, a conductive agent and a single-walled carbon nanotube water-based additive into uniform slurry in a water solvent according to a certain proportion, coating a current collector with the slurry, drying in a vacuum oven, cutting into pieces, and assembling into a button cell. The rate capability of the battery is remarkably improved, and the long cycle stability is also effectively improved. The preparation method is suitable for various lithium ion battery negative electrode materials, especially for negative electrode materials of alloying and conversion type lithium storage mechanisms.

Description

technical field [0001] The invention relates to the field of lithium ion batteries, specifically a Zn battery with high rate and long cycle stability 2 SiO 4 A method for preparing a negative electrode of a lithium ion battery. Background technique [0002] Issues such as energy and the environment are one of the most important issues facing human society at present, and the research and development of renewable energy and related technologies will be the key to solving this issue (Gür T M. Review of electrical energy storage technologies, materials and systems: challenges and prospects for large-scale grid storage [J]. Energy & Environmental Science, 2018, 11(10): 2696-2767.). As a clean energy source, lithium-ion batteries can efficiently and safely store and release energy, and have become the preferred power source for high-energy-density energy storage devices. With the introduction of new energy vehicle incentive policies around the world, new energy vehicles have b...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/1391H01M4/36H01M4/48H01M4/62H01M10/0525
CPCH01M4/1391H01M4/366H01M4/483H01M4/622H01M4/625H01M10/0525H01M2004/027Y02E60/10
Inventor 程仁飞王晓辉张超
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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