A kind of negative electrode of lithium ion battery and preparation method thereof

A lithium-ion battery and negative electrode technology, 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 conducive to normal use, high interface bonding strength, and improving Coulombic efficiency

Active Publication Date: 2022-03-29
HUAZHONG UNIV OF SCI & TECH
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AI Technical Summary

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

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  • A kind of negative electrode of lithium ion battery and preparation method thereof
  • A kind of negative electrode of lithium ion battery and preparation method thereof
  • A kind of negative electrode of lithium ion battery 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 specifically discloses a lithium ion battery negative electrode and a preparation method thereof. The lithium ion battery negative electrode includes a base and a modified material, wherein the base is copper simple substance, and the modified The material is a chalcogen copper compound generated in situ on the surface of the copper element. The preparation method of the negative electrode of the lithium ion battery comprises the following steps: the copper element is placed in the reactor and heated, and then the chalcogenide powder is passed into the reactor through the purge gas, and the chalcogenide powder reacts with the copper element, The uniform chalcogen copper compound is generated in situ on the surface of the copper element, and the preparation of the negative electrode of the lithium ion battery is completed. The invention solves the problem of uneven deposition of lithium ions in the lithium ion battery, improves the cycle stability of the lithium ion battery, and can reduce the nucleation overpotential of lithium ions at the same time, which is beneficial to the nucleation of lithium ions.

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 Patents(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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