Nano-carbon composite lithium metal negative electrode and preparation method thereof

A metal negative electrode and composite lithium technology, applied in the direction of negative electrode, battery electrode, active material electrode, etc., can solve the problems of huge volume change and high mass fraction of lithium metal

Pending Publication Date: 2021-05-18
CHENGDU ORGANIC CHEM CO LTD CHINESE ACAD OF SCI +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0009] Another object of the present invention is to provide a nano-carbon composite lithium metal negative electrode, which can not only solve the problem of lithium dendrite growth and huge volume change of the lithium metal negative electrode in the charging and discharging process, but also its lithium metal No impurities other than carbon are introduced into the negative electrode, the mass fraction of metal lithium is high, and the prepared negative electrode material can release higher specific capacity

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  • Nano-carbon composite lithium metal negative electrode and preparation method thereof
  • Nano-carbon composite lithium metal negative electrode and preparation method thereof
  • Nano-carbon composite lithium metal negative electrode and preparation method thereof

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[0024] The invention provides a method for preparing a nano-carbon composite lithium metal negative electrode, comprising the following steps: S1. performing graphitization treatment on a nano-carbon material to obtain a highly graphitized nano-carbon material; S2. making the highly graphitized nano-carbon material obtained in step S1 The carbon material and the molten liquid lithium are fully mixed and reacted, followed by cooling treatment to obtain a nano-carbon composite lithium metal negative electrode.

[0025] The inventors found that in the preparation process of the nano-carbon composite lithium metal negative electrode in the prior art, other elements are basically introduced into the modification process of the nano-carbon, so that the content of metal lithium in the negative electrode material is low, reducing the lithium metal negative electrode. It is difficult to give full play to the high specific capacity of the lithium metal negative electrode. At the same tim...

Embodiment 1

[0038] This embodiment provides a method for preparing a graphene composite lithium metal negative electrode, comprising the following steps:

[0039] S1. Treat graphene at a constant temperature of 2000°C for 60 minutes to obtain highly graphitized graphene; the XRD spectrum of this highly graphitized graphene is as attached figure 1 As shown, in its XRD spectrum, 2θ appears the characteristic peak of sharp graphite (002) near the 26 ° position, and the degree of graphitization is 92.9%, and in the Raman spectrum, I D : I G = 0.15.

[0040] S2. Under the Ar atmosphere condition, add the highly graphitized graphene powder obtained in step S1 into molten liquid lithium at 200°C, and the amount of highly graphitized graphene added is 20%wt; subsequently, after stirring the mixture continuously for 30 minutes A molten lithium / highly graphitized graphene mixture is obtained; the stirred molten lithium / highly graphitized graphene mixture is coated on a copper foil current collect...

Embodiment 2

[0044] This embodiment provides a method for preparing a graphene composite lithium metal negative electrode, comprising the following steps:

[0045] S1. Graphene is treated at a constant temperature of 1500° C. for 100 minutes to obtain highly graphitized graphene; in the XRD spectrum of this highly graphitized graphene, a sharp characteristic peak of graphite (002) appears at 2θ near the position of 26°, graphite The degree of conversion is 89.3%, and in the Raman spectrum I D : I G = 0.3.

[0046] S2. Under Ar atmosphere conditions, add the highly graphitized graphene powder obtained in step S1 into molten liquid lithium at 300°C, and the amount of highly graphitized graphene added is 25%wt; subsequently, after stirring the mixture continuously for 50 minutes , the liquid lithium is completely infiltrated into the skeleton of the highly graphitized graphene, presenting a uniform silver-white mixed liquid to obtain a molten lithium / highly graphitized graphene mixture; the...

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Abstract

The invention provides a preparation method of a nano-carbon composite lithium metal lithium negative electrode, which comprises the following steps: S1, carrying out graphitization treatment on a nano-carbon material to obtain a highly graphitized nano-carbon material; and S2, fully mixing the highly graphitized nano carbon material obtained in the step S1 with molten liquid lithium, and then carrying out cooling treatment to obtain the nano carbon composite lithium metal negative electrode. According to the preparation method, other substances do not need to be introduced, the effective content of lithium metal in the composite negative electrode is effectively guaranteed, and other side reactions are avoided; and complicated modification operation is not needed, so that the preparation process of the nano-carbon composite lithium metal negative electrode is simple, and the cost is low. The invention further provides the nanocarbon composite lithium metal negative electrode, the problems of lithium dendrite growth and huge volume change of the lithium metal negative electrode in the charging and discharging process can be solved, other impurities except carbon are not introduced into the lithium metal negative electrode, the content of metal lithium is high, and the prepared negative electrode has higher specific capacity.

Description

technical field [0001] The invention relates to the field of lithium batteries, in particular to a nano-carbon composite lithium metal negative electrode and a preparation method thereof. Background technique [0002] Traditional lithium-ion batteries are limited by the theoretical capacity of positive and negative active materials, and its energy density is difficult to break through 300Wh / kg, which has gradually failed to meet people's needs for higher energy density battery systems. Lithium-sulfur batteries and lithium-air batteries have high energy density and are a new generation of batteries with great application prospects. [0003] However, lithium-sulfur batteries and lithium-air batteries inevitably use lithium metal anodes with a theoretical specific capacity of 3860mAh / g. Although lithium metal anodes have many advantages, there is still a certain distance from large-scale applications. The main reasons are: (1) Lithium dendrites are easily generated during the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/1395H01M4/134H01M4/38H01M4/62H01M10/0525
CPCH01M4/1395H01M4/382H01M4/628H01M4/134H01M4/625H01M10/0525H01M2004/027Y02E60/10
Inventor 张焕彭工厂魏志凯黄美灵瞿美臻谢正伟周雪梅
Owner CHENGDU ORGANIC CHEM CO LTD CHINESE ACAD OF SCI
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