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Composite lithium negative electrode and application thereof

A composite lithium and negative electrode technology, applied in the direction of negative electrodes, battery electrodes, active material electrodes, etc., can solve the problems of lithium dendrites piercing the separator, volume expansion, lithium dendrite growth, etc., to reduce the uneven deposition of lithium ions , Improve the ability of anti-expansion, improve the effect of ion conduction rate

Pending Publication Date: 2022-04-19
ENVISION DYNAMICS TECH (JIANGSU) CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The high reactivity of the lithium metal negative electrode leads to a large amount of lithium consumption, which makes lithium dendrite growth prone to occur during the lithium ion deintercalation process, thereby piercing the separator, and the volume expansion of the lithium negative electrode during cycling.
Although the lithium anode has great potential for development, it is impossible to realize the long cycle of the battery only by using pure lithium metal as the anode.
[0004] Based on the above research, how to provide a composite lithium negative electrode, which can solve the problems of excessive volume expansion of lithium metal during charge and discharge cycles, lithium dendrite growth and piercing of the separator, etc.

Method used

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  • Composite lithium negative electrode and application thereof
  • Composite lithium negative electrode and application thereof
  • Composite lithium negative electrode and application thereof

Examples

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Embodiment 1

[0039] This embodiment provides a composite lithium negative electrode, the lithium negative electrode includes lithium metal and functionalized silicon dioxide;

[0040] The functionalized silica is silica functionalized with carboxyl, carbonyl and hydroxyl, and the molar ratio of carboxyl, carbonyl and hydroxyl is 1:1:1;

[0041] The Young's modulus of the functionalized silica is 2.9GPa, and the ion conductivity is 2.4×10 -4 S / cm, particle size D 50 300nm;

[0042] The preparation method of the composite lithium negative electrode comprises the following steps:

[0043] Under an argon atmosphere, stirring and mixing molten lithium metal and functionalized silicon dioxide, and cooling to obtain the composite lithium negative electrode.

[0044] The schematic diagram of the surface state of the composite lithium negative electrode described in this embodiment after 100 cycles is as follows figure 1 shown.

Embodiment 2

[0046] This embodiment provides a composite lithium negative electrode, the lithium negative electrode includes lithium metal and functionalized silicon dioxide;

[0047] The functionalized silicon dioxide is silicon dioxide functionalized with a carbon-carbon double bond and a nitro group, and the molar ratio of the carbon-carbon double bond to a nitro group is 1:3;

[0048]The Young's modulus of the functionalized silica is 2GPa, and the ion conductivity is 1.1×10 -4 S / cm, particle size D 50 100nm;

[0049] The preparation method of the composite lithium negative electrode comprises the following steps:

[0050] Under an argon atmosphere, stirring and mixing molten lithium metal and functionalized silicon dioxide, and cooling to obtain the composite lithium negative electrode.

Embodiment 3

[0052] This embodiment provides a composite lithium negative electrode, the lithium negative electrode includes lithium metal and functionalized silicon dioxide;

[0053] The functionalized silica is silica functionalized with a carbon-carbon triple bond and an aldehyde group, and the molar ratio of the carbon-carbon triple bond to the aldehyde group is 1:10;

[0054] The Young's modulus of the functionalized silica is 1.2GPa, and the ion conductivity is 1.3×10 -4 S / cm, particle size D 50 600nm;

[0055] The preparation method of the composite lithium negative electrode comprises the following steps:

[0056] Under a helium atmosphere, stirring and mixing molten lithium metal and functionalized silicon dioxide, and cooling to obtain the composite lithium negative electrode.

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Abstract

The invention provides a composite lithium negative electrode and application thereof. The composite lithium negative electrode comprises lithium metal and functionalized inorganic particles, the functional groups of the functionalized inorganic particles comprise any one or a combination of at least two of carboxyl, carbonyl, hydroxyl, sulfydryl, aldehyde group, peptide bond, carbon-carbon double bond, carbon-carbon triple bond or nitro; the functionalized inorganic particles are added into the lithium metal, so that the problems of volume expansion and lithium dendrite growth of the lithium metal in the circulation process are solved.

Description

technical field [0001] The invention belongs to the technical field of batteries, and relates to a lithium negative electrode, in particular to a composite lithium negative electrode and an application thereof. Background technique [0002] The lithium metal negative electrode has a high theoretical specific capacity (3860mAh / g), which is ten times that of the current commercialized graphite negative electrode (372mAh / g). Therefore, the use of lithium metal as the negative electrode of power batteries has been widely concerned. [0003] The high reactivity of the lithium metal anode leads to a large amount of lithium consumption, which makes lithium dendrite growth prone to occur during the lithium ion deintercalation process, thereby piercing the separator, and the volume expansion of the lithium anode during cycling. Although the lithium anode has great potential for development, the long cycle of the battery cannot be achieved only by using pure lithium metal as the anode...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/134H01M4/62H01M4/38H01M10/0525
CPCH01M4/134H01M4/382H01M4/628H01M10/0525H01M2004/027Y02E60/10
Inventor 梁伟车佩佩柳金华
Owner ENVISION DYNAMICS TECH (JIANGSU) CO LTD
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