Three-dimensional current collector for metal lithium negative electrode of primary/secondary battery, metal lithium negative electrode and primary/secondary battery

A secondary battery and current collector technology, which is applied in the field of metal lithium negative electrodes and primary/secondary batteries, can solve the problems of damage to the specific capacity performance of composite electrodes, side reactions, poor conductivity and wettability, etc., and achieve good rapid charge and discharge capabilities, High-capacity charge/discharge and high cycle stability

Active Publication Date: 2019-11-12
UNIV OF SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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

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preparation example Construction

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

[0052] After oxidizing the above three-dimensional current collector in a strong oxidant, it is immersed in molten lithium metal to obtain a lithium metal 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 of ≥70%, and the concentrated nitric acid is nitric acid with a mass percentage of 90%-97.5%;

[0055] The strong oxidant is a...

Embodiment 1

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

[0076] Punch the finished carbon tube paper with a punching tool with a diameter of 10mm (thickness 5-6μm, purchased from Suzhou Jidi Nano Co., Ltd.), see figure 1 , figure 1 For the optical photograph (left) and scanning electron microscope photograph (right) of the carbon tube paper in Example 1, a disc with a diameter of 10 mm was obtained. The disc is immersed in a mixed solution of ethanol and concentrated hydrochloric acid with a volume ratio of 10:1 and immersed at room temperature for 6 hours to remove surface oil and catalysts and other impurities. The soaked disc is washed twice in a mixture solution of 2:1 volume ratio of deionized water and ethanol.

[0077] The cleaned carbon tube paper disc is used as the positive electrode, and the lithium plate is used as the negative electrode to assemble a two-electrode button battery. The electrolyte is 100uL 1,3-dioxolane / 1,...

Embodiment 2

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

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

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Abstract

The invention provides a three-dimensional current collector for a metal lithium negative electrode of a primary / secondary battery, which is a nano-network having a porous structure and formed by weaving carbon nano-tubes or carbon nano-tube bundles. The three-dimensional current collector for the metal lithium negative electrode of the primary / secondary battery refers to a three-dimensional carbon nano-tube network material which has the three-dimensional porous structure formed by weaving the carbon nano-tubes or the carbon nano-tube bundles and used for containing metal lithium, can suppress the growth of lithium dendrites in the metal lithium secondary battery, and can realize high-capacity discharge under high current density. The metal lithium negative electrode of the primary / secondary battery prepared from the three-dimensional current collector has extremely high long cycling stability and can be charged and discharged for multiple times by extremely high specific capacity; and meanwhile, the composite negative electrode shows good rapid charge and discharge capacity.

Description

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

Claims

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Application Information

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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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