Lithium ion battery negative electrode and preparation method thereof

A lithium ion battery and negative electrode technology, which is applied in the field of lithium ion battery negative electrode and its preparation, can solve problems such as uneven deposition of lithium ions, and achieve the effects of being beneficial to normal use, reducing nucleation overpotential, and avoiding lithium dendrite growth.

Active Publication Date: 2020-07-03
HUAZHONG UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0004] In view of the above defects or improvement needs of the prior art, the present invention provides a lithium ion battery negative electrode and a preparation method thereof. As the negative electrode of lithium-ion batteries, it solves the problem of uneven deposition of lithium ions in lithium-ion batteries and improves the cycle stability of lithium-ion batteries

Method used

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

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preparation example Construction

[0031] The preparation method of above-mentioned negative pole of lithium ion battery comprises the steps:

[0032] Place the copper element in the reactor and heat it, then pass the chalcogenide powder into the reactor through the purge gas, and the chalcogenide powder reacts with the copper element to generate uniform chalcogenide copper on the surface of the copper element in situ compound to complete the preparation of the lithium ion battery negative electrode.

[0033] Further, the chalcogenide powder is sulfur powder, selenium powder or tellurium powder; the purge gas is argon or nitrogen, and its flow rate is 20ml / min-100ml / min; the reactor is a tube furnace.

[0034] Preferably, the heating temperature is 100°C to 1000°C, more preferably 400°C to 800°C, and the heating time is 1 min to 60 min, more preferably 5 min to 20 min.

Embodiment 1

[0037] Accurately weigh 0.1505g of Se powder, scatter evenly in the porcelain boat, place the porcelain boat at the air inlet of the tube furnace, and simultaneously place the figure 1 The copper foil shown is placed in the middle of the tube furnace, and when the heating temperature and heating time are adjusted to 600°C and 5min respectively, the Ar atmosphere is used at a flow rate of 40ml / min to obtain a uniformly distributed copper foil modified material, such as figure 2 shown.

Embodiment 2

[0039] Accurately weigh 0.0502g of Se powder, and evenly distribute it in the porcelain boat. At the same time, put the foamed copper in the porcelain boat, then wrap the porcelain boat with copper foil, place it in the middle of the tube furnace, and set the heating temperature and heating time respectively. When adjusted to 600° C. for 10 minutes, an Ar atmosphere is used at a flow rate of 60 ml / min to obtain evenly distributed copper foil containing copper-selenium compounds and copper foam containing copper-selenium compounds.

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Abstract

The invention belongs to the field of metal lithium battery negative electrode materials, and particularly discloses a lithium ion battery negative electrode and a preparation method thereof. The lithium ion battery negative electrode comprises a substrate and a modified material, wherein the substrate is elemental copper, and the modified material is a chalcogenide copper compound generated in situ on the surface of the elemental copper. The preparation method of the lithium ion battery negative electrode comprises the following steps: putting elemental copper into a reactor, heating, introducing chalcogenide powder into the reactor through purge gas, and enabling the chalcogenide powder to react with the elemental copper, so that a uniform chalcogenide copper compound is generated on thesurface of the elemental copper in situ so as to complete the preparation of the lithium ion battery negative electrode. According to the invention, the problem of uneven deposition of lithium ions in a lithium ion battery is solved, the cycling stability of the lithium ion battery is improved, the nucleation overpotential of the lithium ions can be reduced, and nucleation of the lithium ions isfacilitated.

Description

technical field [0001] The invention belongs to the field of metal lithium battery negative electrode materials, and more specifically relates to a lithium ion battery negative electrode and a preparation method thereof. Background technique [0002] Achieving uniform and stable lithium deposition is the key to obtain an ideal lithium metal anode with high theoretical specific capacity (up to 3860mAh / g) and low redox potential (3.04V compared to standard hydrogen electrode) And low density, it is expected to be used in the next generation of high energy density batteries. [0003] However, the uneven deposition of lithium ions can lead to the formation of dendrite-like or moss-like dendrite structures on the electrode surface, resulting in reduced Coulombic efficiency and shortened cycle life. When lithium dendrites continue to grow to pierce the separator, it will also cause thermal runaway or even fire and explosion of the battery, causing serious safety problems. In add...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/58H01M4/38H01M10/0525H01M10/052H01M4/04
CPCH01M4/5815H01M4/581H01M4/38H01M10/0525H01M10/052H01M4/0471H01M4/049Y02E60/10
Inventor 贺丹琪李真黄云辉廖亚祺何斌
Owner HUAZHONG UNIV OF SCI & TECH
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