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Composite negative electrode and preparation method thereof as well as electrochemical power source and application thereof

A negative electrode, electrochemical technology, applied in the field of composite negative electrode and its preparation, electrochemical power supply, can solve the problems of small electrode deposition thickness, complicated preparation process, low electrode preparation efficiency, etc.

Active Publication Date: 2014-05-14
TONGDING INTERCONNECTION INFORMATION CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the preparation process of this method is relatively complicated, and it requires on-site electrodeposition of tin alloy and carbon nanotubes, the electrode deposition thickness is small, the specific energy of the battery is not greatly improved, and the electrode preparation efficiency is low.

Method used

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  • Composite negative electrode and preparation method thereof as well as electrochemical power source and application thereof
  • Composite negative electrode and preparation method thereof as well as electrochemical power source and application thereof
  • Composite negative electrode and preparation method thereof as well as electrochemical power source and application thereof

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preparation example Construction

[0052] The example of the present invention also provides a method for preparing the above-mentioned composite negative electrode with a simple process. For the process flow of the composite negative electrode preparation method, please refer to Figure 5 , see also figure 1 and 2 , the preparation method of the composite negative electrode comprises the following steps:

[0053] S01. Prepare active material-containing slurry: disperse conductive agent, binder, and the above-mentioned active material capable of intercalating lithium ions in an aqueous or oily solvent, and prepare active material-containing slurry; wherein, the adhesive, The weight ratio of conductive agent to active material is (1~15):(0~15):100, and the content of active material in the slurry is 20~70%;

[0054] S02. Inject slurry: inject the slurry prepared in step S01 into the hole 2 of a porous current collector 1 and dry to obtain the composite negative electrode; or inject the slurry prepared in step...

Embodiment 1

[0068] A composite negative electrode and its preparation method:

[0069] The composite negative electrode structure is as figure 2 , 3 As shown, it includes a nickel foam current collector 1 and its mesh 2 is filled with an active filler 3 . The thickness of the nickel foam 1 is 150 μm, and the active filler 3 contains a binder, a conductive agent and an active material capable of intercalating lithium ions in a weight ratio of 8:3:89. Among them, the binder is CMC, the conductive agent is SP, and the active material capable of intercalating lithium ions is Si, SiO with a weight ratio of 40:10:50. 2 and graphite nanopowder mixture.

[0070] The method of the composite negative electrode:

[0071] S11. Preparation of slurry containing active substances: Add active substance powder (active substance is not a simple powder mixture, but sintered by a certain process, and it is already a uniformly dispersed compound) into pure water, and disperse by ultrasonic waves Uniform...

Embodiment 2

[0075] A composite negative electrode and its preparation method:

[0076] The composite negative electrode structure is as figure 2 , 4 As shown, it includes two layers of copper mesh collectors 11 and 12 that are laminated and combined into one, and active fillers 3 filled in the holes 2 of the copper mesh collectors 11 and 12 . The thickness of the copper mesh current collectors 11 and 12 is 50 μm, and the active filler 3 contains a binder, a conductive agent and an active material capable of intercalating lithium ions in a weight ratio of 6:3:91. Among them, the binder is PVDF, the conductive agent is VGCF, and the active material capable of intercalating lithium ions is nano-scale stannous oxide powder.

[0077] The method of the composite negative electrode:

[0078] S21. Preparation of slurry containing active substances: Add PVDF to NMP solvent to prepare a gel solution, then add the mixture of nano-stannous oxide powder and VGCF conductive agent mixed uniformly in...

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Abstract

The invention provides a composite negative electrode and a preparation method thereof as well as a lithium battery. The composite negative electrode comprises one layer or more than two layers of porous current collectors which are combined in a laminating manner, wherein holes of the porous current collectors are filled with active fillers; the active filler contains a binding material, a conductive agent and an active substrate having lithium ion implanting capability; the weight of the active substance accounts for 80-98% of the total weight of the active filler. The preparation method of the composite negative electrode comprises preparation of sizing agents containing the active substances and injection of the sizing agents. The lithium battery contains the composite negative electrode. The composite negative electrode has stable volume and is high in capacity; the preparation method is simple in process and high in production efficiency, conditions are easy to control, and production cost is reduced. The lithium battery has large-current charge and discharge characteristics and also has characteristics of high specific energy and power.

Description

technical field [0001] The invention belongs to the technical field of batteries, and in particular relates to a composite negative electrode, a preparation method thereof, an electrochemical power source and an application thereof. Background technique [0002] Most of the existing lithium-ion batteries use graphite-based negative electrode materials, and the active material is coated on a flat copper foil current collector. Although the volume expansion of graphite material due to charging is only about 10%, even after hundreds of cycles of charging and discharging, the active material and the current collector can still maintain good electrical contact. However, in order to pursue high specific energy density, the coating of the pole piece The thickness is as high as tens of microns or even more than one hundred microns. In this way, the distance between the active material on the surface of the pole piece and the current collector is long, and the electron transmission ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/134H01M4/38H01M4/1395H01M10/0525H01M12/06H01G11/50
CPCH01M4/131H01M4/133H01M4/134H01M4/1391H01M4/1393H01M4/1395H01M4/80H01M10/0525Y02E60/10
Inventor 姚彩芳骆兆军
Owner TONGDING INTERCONNECTION INFORMATION CO LTD
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