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A three-dimensional current collector, metal lithium negative electrode and primary/secondary battery for primary/secondary battery lithium metal negative electrode

A secondary battery and metal lithium technology, which is applied to the electrodes of primary batteries, battery electrodes, lithium batteries, etc., can solve the problems of damage to the specific capacity performance of composite electrodes, side reactions, poor conductivity and wettability, etc., and achieve good fast charging and discharging high capacity, high capacity charge/discharge, and high cycle stability

Active Publication Date: 2021-12-10
UNIV OF SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Among them, although the polymer fiber net has good structural strength and stability, its conductivity and wettability with metal lithium are poor; metal foam materials have good structural strength, stability, conductivity, and wettability with lithium, but the density Higher, which damages the specific capacity performance of the composite electrode as a whole. In addition, the active metal skeleton will inevitably lead to side reactions; carbon materials have good electrical conductivity and low density. However, currently widely studied Graphite nano-current collector system generally has the problem of low mass capacity and surface capacity available for electrodes

Method used

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  • A three-dimensional current collector, metal lithium negative electrode and primary/secondary battery for primary/secondary battery lithium metal negative electrode
  • A three-dimensional current collector, metal lithium negative electrode and primary/secondary battery for primary/secondary battery lithium metal negative electrode
  • A three-dimensional current collector, metal lithium negative electrode and primary/secondary battery for primary/secondary battery lithium metal negative electrode

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preparation example Construction

[0051] The present invention also provides a method for preparing the metal lithium negative electrode of the above-mentioned primary / secondary battery, comprising the following steps:

[0052] After the above three-dimensional current collector is oxidized in a strong oxidant, it is immersed in molten metal lithium to obtain a metal lithium negative electrode.

[0053] In the present invention, the strong oxidant is selected from a mixture of dilute sulfuric acid and potassium permanganate, a mixture of concentrated sulfuric acid and concentrated nitric acid, a mixture of concentrated sulfuric acid and potassium permanganate, a mixture of concentrated sulfuric acid and potassium dichromate, or Two or more of the above mixtures.

[0054] The concentration of the dilute sulfuric acid is 1-3M, the concentrated sulfuric acid is concentrated sulfuric acid with a mass percentage ≥ 70%, and the concentrated nitric acid is nitric acid with a mass percentage of 90%-97.5%;

[0055] Th...

Embodiment 1

[0075] 1. Preparation and testing of lithium@carbon tube paper metal negative electrode by electrodeposition method

[0076] Punch the carbon tube paper finished product (thickness 5~6 μm, purchased from Suzhou Jiedi Nano Co., Ltd.) with a die tool with a diameter of 10 mm, see figure 1 , figure 1 It is the optical photo (left) and the scanning electron micrograph (right) of the carbon tube paper in Example 1, and a disc with a diameter of 10 mm was obtained. Submerge the disc in a mixed solution of ethanol and concentrated hydrochloric acid with a volume ratio of 10:1, and soak at room temperature for 6 hours to remove impurities such as surface oil and catalyst. The soaked wafers were cleaned twice in a mixed solution of deionized water and ethanol with a volume ratio of 2:1.

[0077] The cleaned carbon tube paper disc is used as the positive electrode, and the lithium sheet is used as the negative electrode to assemble a two-electrode button battery. The electrolyte is 1...

Embodiment 2

[0083] Cut 4cm 2 Carbon tube paper (thickness 5.5±0.5μm, purchased from Suzhou Jiedi Nano Co., Ltd.) was immersed in 4M concentrated sulfuric acid, and then 1g of potassium permanganate was added, stirred and heated in a water bath at 80°C for 6h. The reaction is complete when brownish yellow appears on the side wall of the vessel. Take out the modified carbon tube paper and rinse it with deionized water for 15s, and then soak it in the solution of ethanol and water with a volume ratio of 1:1 for 2h twice to complete the cleaning. It was then dried in an air-atmosphere oven at 60° C. for 6 h.

[0084] The finished modified carbon tube paper is still stamped as Put the wafer into a glove box with an argon atmosphere, heat the lithium slice to 260°C, and the lithium slice will melt into a bright silver liquid. One end of the carbon tube paper is immersed in molten lithium, and the molten lithium reacts with the surface functional groups of the modified carbon tubes to lithia...

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Abstract

The invention provides a three-dimensional current collector for metal lithium negative poles of primary / secondary batteries, which is composed of carbon nanotubes or a nano network with a porous structure formed by clustering and weaving of carbon nanotubes. The three-dimensional current collector used in the primary / secondary battery lithium metal negative electrode provided by the present invention refers to a three-dimensional porous structure woven into carbon nanotubes or carbon nanotube bundles, and the porous structure is used to accommodate metal lithium, which may be able to inhibit the secondary use of metal lithium. Growth of lithium dendrites in batteries, three-dimensional carbon nanotube network materials for high-capacity discharge at high current densities. The primary / secondary battery metal lithium negative electrode prepared by using the three-dimensional current collector provided by the invention has extremely high long-term cycle stability and can be charged and discharged multiple times with a very high specific capacity; at the same time, the composite negative electrode shows good fast charge and discharge capability.

Description

technical field [0001] The invention belongs to the technical field of batteries, and in particular relates to a three-dimensional current collector for metal lithium negative electrodes of primary / secondary batteries, metal lithium negative electrodes and primary / secondary batteries. Background technique [0002] In the 21st century, with the increasing requirements for battery capacity in electronic devices and electric vehicles, the existing commercial lithium-ion batteries with mature technology and widely used can no longer meet the capacity requirements. The main reason is that the theoretical specific capacity of the traditional graphite negative electrode used in lithium-ion batteries is only 372mA h g -1 , low energy density, which in turn limits the capacity of lithium-ion batteries. In order to meet the battery capacity requirements of various devices, the future world urgently needs lithium anode materials with higher specific capacity. Metal lithium anode has ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/66H01M4/74H01M4/06H01M4/12H01M4/134H01M4/1395H01M4/04H01M6/14H01M10/052
CPCH01M4/663H01M4/742H01M4/06H01M4/12H01M4/134H01M4/1395H01M4/0402H01M4/0457H01M6/14H01M10/052Y02E60/10
Inventor 季恒星孙兆威金松
Owner UNIV OF SCI & TECH OF CHINA
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