3D-printed high-specific-energy lithium ion battery positive and negative electrode material and preparation method and application thereof

A lithium-ion battery and 3D printing technology, applied in the field of electrochemical energy storage, can solve problems such as the difficulty in realizing the printing accuracy of materials, and achieve the effects of small ion transport resistance, short diffusion path, and increased capacity

Pending Publication Date: 2022-08-02
WUHAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, although it ensures the overall quality and porosity of the electrode block, there are still difficulties in the selection of materials and the realization of printing accuracy

Method used

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  • 3D-printed high-specific-energy lithium ion battery positive and negative electrode material and preparation method and application thereof
  • 3D-printed high-specific-energy lithium ion battery positive and negative electrode material and preparation method and application thereof
  • 3D-printed high-specific-energy lithium ion battery positive and negative electrode material and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] 350 mg of NCM811, 100 mg of carbon nanotubes and 50 mg of polyvinylidene fluoride were weighed and mixed, respectively, and the solid components were taken into the mortar for dry grinding for 10 minutes, and then 1 mL of N-methylpyrrolidone solvent was added for further grinding for 20 minutes. Finally, using a high-speed mixer for 15 minutes to obtain sufficient mixing, a paste-like 3D printing ink, namely NCM811-CNTs, was synthesized. figure 1 As shown, the rheological properties of the fabricated 3D printed battery cathode slurry are as follows figure 2 As shown in a, it can be seen from the figure that the apparent viscosity of the prepared slurry decreases with the increase of shear rate, showing obvious shear thinning behavior. Necessary for printability.

Embodiment 2

[0032] Weigh 250 mg of NCM811, 150 mg of acetylene black and 100 mg of sodium alginate and mix, respectively, take the solid components and put them in the mortar for dry grinding for 10 minutes, and then add 2 mL of pure water for further grinding for 20 minutes. Finally, using a high-speed mixer for 15 minutes to obtain sufficient mixing, a paste-like 3D printing ink, namely NCM811-acetylene black, was synthesized.

Embodiment 3

[0034] 350 mg of NCM811, 100 mg of reduced graphene oxide and 50 mg of polyvinylidene fluoride were respectively weighed and mixed, and the solid components were put into the mortar for dry grinding for 10 minutes, and then 1.5 mL of N-methylpyrrolidone solvent was added for further grinding for 20 minutes. Finally, using a high-speed mixer for 15 minutes to obtain sufficient mixing, a paste-like 3D printing ink NCM811-rGO was synthesized. image 3 a shown.

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Abstract

The invention discloses a 3D printed high-specific-energy lithium ion battery positive and negative electrode material as well as a preparation method and application thereof. The positive and negative electrode materials comprise the following components: a solid electrode active material, a conductive agent, a binder and a dispersant, the weight ratio of the solid electrode active material to the conductive agent to the binder is (8-5): (3-1): (2-1), and the ratio of the volume of the dispersant to the total weight of the solid electrode active material, the conductive agent and the binder is (1-3) mL: 0.5 g. According to the invention, the prepared positive and negative electrode materials are subjected to pore-forming by using a freeze-drying technology so as to prepare the 3D-printed high-specific-energy lithium ion battery positive and negative electrode material. The positive electrode material and the negative electrode material prepared by the 3D printing technology have the advantages of larger surface area, higher surface load density, shorter diffusion path and smaller resistance in the ion transportation process. According to the preparation method, the capacity of the lithium ion battery is improved, and the energy density and the power density are further improved.

Description

technical field [0001] The invention relates to the field of electrochemical energy storage, in particular to a 3D printed high specific energy lithium ion battery positive and negative electrode materials and a preparation method and application thereof. Background technique [0002] A lithium-ion battery is a secondary battery that mainly relies on the movement of lithium ions between the positive and negative electrodes to work. Compared with other electrochemically rechargeable devices, lithium-ion batteries have the advantages of large capacity, low self-discharge rate, and high operating voltage, and are the most promising electrochemically rechargeable devices. Therefore, a lot of research has been done on potential materials and their processing techniques to improve the energy density of Li-ion batteries. Lithium-ion batteries are mainly composed of positive electrodes, negative electrodes, diaphragms and electrolytes, among which NCM ternary materials are highly a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/1391H01M4/1393H01M4/131H01M4/133H01M10/0525B33Y80/00F26B5/06
CPCH01M4/1391H01M4/1393H01M4/131H01M4/133H01M10/0525H01M4/0402B33Y80/00F26B5/06Y02P70/50
Inventor 王腾王文涛赵焱
Owner WUHAN UNIV
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