Continuous, controllable and effective pre-lithiation system and lithium supplementing method

A pre-lithiation and lithiation technology, used in non-aqueous electrolyte battery electrodes, electrical components, battery electrodes, etc., can solve the problems of poor cycle performance, low coulomb efficiency in the first cycle, and low capacity, and achieve a controllable and excellent degree. Electrochemical performance, uniform effect of lithiation

Active Publication Date: 2020-05-15
INST OF CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to solve the problems of low first cycle coulombic efficiency, poor cycle performance and low capacity of existing lithium-ion batteries based on silicon-based material electrodes, and to provide a continuous, controllable and effective pre-lithiation system and lithium supplementation method , so as to improve the first-cycle Coulombic efficiency, capacity and cycle performance of lithium-ion batteries based on silicon-based anode materials

Method used

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  • Continuous, controllable and effective pre-lithiation system and lithium supplementing method
  • Continuous, controllable and effective pre-lithiation system and lithium supplementing method
  • Continuous, controllable and effective pre-lithiation system and lithium supplementing method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Install the coated and dried silicon-carbon composite negative electrode coil with a theoretical capacity of 700 mAh per gram on the unwinding device, install the lithium ingot or lithium ribbon on the roller, and then coat the carbon nanotube film On the surface of lithium ingots or lithium strips, the rollers of the indirect lithiation device are formed, and the silicon-carbon composite negative electrode rolls are respectively attached to the surface of the rollers of the indirect lithiation device by traction, passing through the electrolyte and cleaning device in the negative pressure indirect lithiation device , drying device, rolling device and winding device, start the system to start negative pressure lithiation; wherein lithium hexafluorophosphate with a concentration of 2 moles per liter is selected as the electrolyte for lithiation for 30 minutes.

[0030] The surface morphology of the lithiated silicon anode was characterized by scanning electron microscopy,...

Embodiment 2

[0032] Install the coated and dried silicon-carbon composite negative electrode coil with a theoretical capacity of 700 mAh per gram on the unwinding device, and pass through the negative pressure indirect lithiation device, cleaning device, drying device, and roller press respectively after being drawn. device and winding device, start the system to start lithiation; wherein the lithium hexafluorophosphate solution with a concentration of 0.5 moles per liter is selected for lithiation for 30 minutes. The electrochemical performance test results of the obtained materials are listed in Table 1.

Embodiment 3

[0038] Install the coated and dried silicon-carbon composite negative pole coil with a theoretical capacity of 1000 mAh per gram on the unwinding device, and then pass through the negative pressure indirect lithiation device, cleaning device, drying device, and roller pressing device respectively through traction. device and winding device, start the system to start lithiation under negative pressure conditions; wherein a lithium hexafluorophosphate solution with a concentration of 5 moles per liter is selected for lithiation for 60 minutes. The electrochemical performance test results of the obtained materials are listed in Table 1.

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Abstract

The invention discloses a continuous, controllable and effective pre-lithiation system and a lithium supplementing method. The pre-lithiation system comprises an unwinding device, a negative-pressureindirect lithiation device, a cleaning device, a drying device, a rolling device and a winding device. The lithium supplementing method comprises the following steps of firstly, coating a metal lithium ingot with a layer of resistance buffer film, enabling a continuous pole piece to pass through a negative pressure indirect buffer device, contacting the pole piece with the metal lithium ingot coated with the resistance buffer film indirectly in the presence of electrolyte, thereby realizing the pre-lithiation of an electrode. The pre-lithiation system can achieve continuous production, the lithiation degree is controllable, lithiation is uniform, the method is simple and convenient, and the industrial production can be achieved easily.

Description

technical field [0001] The invention belongs to the technical field of batteries, and in particular relates to a continuous, controllable and effective pre-lithiation system and lithium replenishment method, as well as a pre-lithiation electrode and a lithium-ion battery prepared based on the method. Background technique: [0002] Lithium-ion batteries have developed rapidly in the past 20 years since their invention, which has greatly promoted the development of various fields. As a portable energy supply device, lithium-ion batteries have been widely used in civilian and military fields, such as 3C digital, positioning trackers, remote control devices, mobile information terminals and other portable electronic products that use lithium-ion batteries as power In addition, lithium-ion batteries also play an indispensable role in UPS uninterruptible power supplies, energy storage power stations and other fields. However, with the rapid development of modern technology and th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/13H01M4/139
CPCH01M4/13H01M4/139Y02E60/10
Inventor 郭玉国孟庆海殷雅侠
Owner INST OF CHEM CHINESE ACAD OF SCI
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