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Composite metal lithium negative electrode and preparation method thereof

A composite metal, lithium negative electrode technology, applied in battery electrodes, structural parts, electrical components and other directions, can solve the problems of graphene oxide sheets that cannot be continuously produced, complex processes, no significance and value for amplification and practical application, etc. Solving the problem of lithium dendrite growth, uniform distribution, and alleviating the effect of negative electrode volume changes

Active Publication Date: 2018-09-18
CHINA AVIATION LITHIUM BATTERY RES INST CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the process is complicated, and the required graphene oxide sheets cannot be produced continuously, so they can only be produced in a small area by suction filtration.
In particular, it is necessary to use molten liquid lithium, which can only be operated under the protection of Ar gas
In general, this method does not have the significance and value of amplification and practical application

Method used

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  • Composite metal lithium negative electrode and preparation method thereof
  • Composite metal lithium negative electrode and preparation method thereof
  • Composite metal lithium negative electrode and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] The polymer content in the composite metal lithium negative electrode is 2%, the nano-scale carbon material content is 25%, and the lithium metal content is 73%.

[0024] The composite metal lithium negative electrode is obtained by accumulative rolling method. The specific method is: using the cohesiveness of the polymer PTFE, rolling by the metal rolling method, and the deformation of the lower pressure is 10% to 50%, to obtain a three-dimensional rolling after one rolling Network polymer; the carbon material is spread on the surface of the three-dimensional network polymer, and then rolled, and the compression deformation is 20% to 50%, and the carbon is filled into the three-dimensional network structure to obtain a secondary structure filled with carbon; the metal Lithium is tiled on the surface of the secondary structure, and then rolled, with a deformation of 20% to 50% under pressure, a part of the metal lithium is embedded in the carbon material, and a part of t...

Embodiment 2

[0027] The polymer content in the composite metal lithium negative electrode is 10%, the nano-scale carbon material content is 50%, and the lithium metal content is 40%.

[0028] The composite metal lithium negative electrode was obtained by accumulative rolling method, and the specific method was the same as in Example 1.

Embodiment 3

[0030] The polymer content in the composite metal lithium negative electrode is 20%, the nano-scale carbon material content is 30%, and the lithium metal content is 50%.

[0031] The composite metal lithium negative electrode was obtained by accumulative rolling method, and the specific method was the same as in Example 1.

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Abstract

The invention provides a composite metal lithium negative electrode, the composite metal lithium negative electrode comprises a first-level network structure formed by a polymer; a secondary network structure obtained by filing a nano-scale carbon material into the first-level network structure; and a three-level composite structure obtained by filling lithium metal into the secondary network structure. Firstly, the secondary network structure filled with the carbon material is obtained by an accumulative roll bonding method, and then the lithium metal is embedded into the secondary network structure filled with the carbon material by the accumulative roll bonding method, and lithium electrodeposition or evaporative lithium plating to obtain the composite metal lithium negative electrode.The composite metal lithium negative electrode can improve the deposition morphology of the lithium and solve the problem of lithium dendrite growth, thereby improving the cycle performance and safetyof a battery.

Description

technical field [0001] The invention belongs to the field of lithium ion secondary batteries, in particular to a composite metal lithium negative electrode and a preparation method thereof. Background technique [0002] Lithium-ion secondary batteries use lithium ions to move between the positive and negative electrodes to provide electrical energy to the outside. Improving the specific energy of lithium-ion secondary batteries is the main development direction of lithium-ion secondary batteries at present. One of the effective methods is to use lithium metal as the negative electrode. This is because metal lithium per unit weight or volume can release the most energy during the discharge process when it migrates from the negative electrode to the positive electrode, that is, metal lithium is the negative electrode active material with the highest weight or volume specific energy. However, metal lithium will grow lithium dendrites on the surface during the charge-discharge...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/60H01M4/38H01M10/0525H01M4/583H01M4/62
CPCH01M4/362H01M4/382H01M4/583H01M4/602H01M4/625H01M10/0525Y02E60/10
Inventor 张磊李艳红李洋彭祖玲
Owner CHINA AVIATION LITHIUM BATTERY RES INST CO LTD
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