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A preparation method of zinc germanate/carbon composite fiber negative electrode material for lithium ion battery

A technology for lithium-ion batteries and negative electrode materials, applied in battery electrodes, spinning solution preparation, circuits, etc., can solve the problems of reducing the actual specific capacity of electrode materials, low electrical conductivity and ion mobility, and difficult maintenance of electrode structures. Facilitate large-scale application, improve electrical conductivity, and enrich the effect of raw materials

Active Publication Date: 2017-07-11
NORTHEAST NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] However, Zn 2 GeO 4 There are also several disadvantages: low intrinsic conductivity and ion mobility; large volume expansion and contraction when deintercalating lithium, which makes it difficult to maintain the electrode structure and greatly reduces the cycle performance. These shortcomings severely limit the Zn 2 GeO 4 Large-scale application of similar electrode materials
In order to increase Zn 2 GeO 4 Intrinsic conductivity and cycle stability, nanonization and compounding / hybridization with materials with high conductivity are ideal solutions, but the current high-performance Zn 2 GeO 4 Among the electrode materials, most of the nano-Zn 2 GeO 4 Combining materials with graphene, the preparation process is complicated, the cost is high, and the use of metal current collectors is required in the electrode preparation process, which greatly reduces the actual specific capacity of the entire electrode material

Method used

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  • A preparation method of zinc germanate/carbon composite fiber negative electrode material for lithium ion battery
  • A preparation method of zinc germanate/carbon composite fiber negative electrode material for lithium ion battery
  • A preparation method of zinc germanate/carbon composite fiber negative electrode material for lithium ion battery

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Experimental program
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Effect test

Embodiment 1

[0027] Dissolve 8g of PAA in 100mL of water, and combine magnetic stirring and ultrasonic vibration to fully dissolve PAA. Disperse 1g of zinc germanate in 25mL of the above PAA aqueous solution and mix well; then add citric acid under stirring and stir for 1 hour to obtain a uniform and transparent spinning solution. Then, under the voltage of 13kV, the prepared solution was electrospun; after the spinning was completed, the spinning was collected, and the tube furnace was heat-treated at 700°C for 5 hours under the protection of nitrogen, and finally a self-supporting structure was obtained. Zn2 GeO 4 / C composite fiber. Prepared Zn 2 GeO 4 The single fiber diameter of / C composite fiber is about 180nm, and the length is hundreds of microns, which has good mechanical flexibility. at 1A g -1 Under the current density, the capacity remains at 912.5mAh g after 300 cycles -1 above and the Coulombic efficiency is higher than 99%.

Embodiment 2

[0029] Dissolve 8g of PAA in 100mL of water, and combine magnetic stirring and ultrasonic vibration to fully dissolve PAA. Disperse 0.7g of zinc germanate in 25mL of the above PAA aqueous solution and mix well; then add citric acid under stirring and stir for 1 hour to obtain a uniform and transparent spinning solution. Then, under the voltage of 15kV, the prepared solution was electrospun; after the spinning was completed, the spinning was collected, and the tube furnace was heat-treated at 700°C for 5 hours under the protection of nitrogen, and finally a self-supporting structure was obtained. Zn 2 GeO 4 / C composite fiber. at 1A g -1 Under the current density, the capacity remains at 916.7mAh g after 300 cycles -1 above and the Coulombic efficiency is higher than 99%.

Embodiment 3

[0031] Dissolve 8g of PAA in 100mL of water, and combine magnetic stirring and ultrasonic vibration to fully dissolve PAA. Disperse 1.5g of zinc germanate in 30mL of the above PAA aqueous solution and mix well; then add citric acid under stirring and stir for 1 hour to obtain a uniform and transparent spinning solution. Then, under the voltage of 12kV, the prepared solution was electrospun; after the spinning was completed, the spinning was collected, and the tube furnace was heat-treated at 750°C for 5 hours under the protection of nitrogen, and finally a self-supporting structure was obtained. Zn2GeO4 / C composite fiber. at 1A g -1 Under the current density, the capacity remains at 726.6mAh g after 300 cycles -1 above and the Coulombic efficiency is higher than 99%.

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Abstract

The invention belongs to the technical field of new energy resources and particularly relates to a preparation method of a zinc germanate / carbon complex fiber cathode material for a lithium ion battery. According to the preparation method, volume-phase or micrometer-sized or nanometer-sized zinc germanate dissolves in a macromolecular solution by using organic acid, and a zinc germanate / carbon composite material with a self-supporting structure and having certain flexibility is prepared by adopting an electrostatic spinning and high-temperature calcination combination method. The material can be directly cut into electrode slices to be applied to a lithium ion battery cathode, extra addition of a conductive agent and a binding agent and a current collector not needed in the electrode preparing process, and the overall weight of the cathode is greatly decreased. After the material is assembled into a button battery, excellent electrochemical performance is played, the capacity is kept to be greater than 900 mAh g<-1> after 300-time cycling under the condition of 1 A g<-1> current density, and the coulombic efficiency is above 99%. The zinc germanate / carbon complex fiber cathode material for the lithium ion battery is low in cost, simple in production process and high in safety, and a compound prepared by utilizing the material can be applied to a portable electronic device, an electric automobile and a wearable electronic product.

Description

technical field [0001] The invention belongs to the technical field of new energy materials, and in particular relates to a preparation method of a zinc germanate / carbon composite fiber negative electrode material for a lithium ion battery. The obtained material has a self-supporting structure, and as a negative electrode material for a lithium ion battery, no additional Add conductive agent, binder, and do not need to use current collector. Background technique [0002] With the increasing depletion of traditional energy sources and the ensuing intensified environmental problems, the rapid development of the global economy urgently requires the development of an efficient, environmentally friendly and sustainable energy source. Among many new energy sources, lithium-ion batteries (LIB) stand out due to their advantages such as high energy density, long cycle life, low self-discharge, and fast charging and discharging. Currently, they have been used in portable electronic pr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D04H1/728D04H1/4382D01D1/02D06C7/00H01M4/36H01M4/62H01M4/139
CPCY02E60/10
Inventor 张景萍李欢欢孙海珠范朝英张琳琳王康
Owner NORTHEAST NORMAL UNIVERSITY
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