Graphene-based negative electrode material for lithium-ion battery

A negative electrode material and ion battery technology, applied in the direction of battery electrodes, secondary batteries, circuits, etc., can solve the problems that affect the quality and performance of composite materials, cannot fully meet the volume expansion of non-carbon active materials, and reduce the volume performance of negative electrode materials. Achieve the effects of ensuring electronic conductivity, green and pollution-free preparation process, and improving cycle performance

Active Publication Date: 2017-05-31
TIANJIN UNIV
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  • Abstract
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  • Application Information

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Problems solved by technology

Loading non-carbon active materials in dense three-dimensional graphene macroscopic bodies can significantly increase the density of composite materials, but too dense graphene skeleton structure cannot fully satisfy the volume expansion of non-carbon active materials during lithium intercalation. As a result, the quality performance of the composite material is affected, and the volume performance of the negative electrode material is also reduced.

Method used

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  • Graphene-based negative electrode material for lithium-ion battery
  • Graphene-based negative electrode material for lithium-ion battery
  • Graphene-based negative electrode material for lithium-ion battery

Examples

Experimental program
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Embodiment 1

[0036] This embodiment provides a graphene-based lithium-ion battery negative electrode material, the negative electrode material is a three-dimensional porous graphene-non-carbon material composite electrode material, which includes three-dimensional porous graphene and a non-carbon material loaded on the three-dimensional porous graphene, The negative electrode material has a rich pore structure, and its specific surface area is 191m 2 / g, the pore volume is 0.25cm 3 / g, the bulk density is 2.18g / cm 3 , and the sum of the volumes of the pores in the negative electrode material is 2.59 times the sum of the volumes of the non-carbon materials.

[0037] Among them, the non-carbon material is tin dioxide, and the mass ratio of three-dimensional porous graphene to tin dioxide is 1:2.

[0038] The preparation method of the negative electrode material at least comprises the following steps:

[0039] In the first step, take 78.5mL of 2mg / mL graphene oxide dispersion and place it ...

Embodiment 2

[0047] The difference with embodiment 1 is:

[0048] The specific surface area of ​​the three-dimensional porous graphene-tin dioxide composite electrode material is 256 m 2 / g, the pore volume is 0.19cm 3 / g, the block density is 2.46g / cm 3 , and the sum of the volumes of the pores in the negative electrode material is 1.98 times the sum of the volumes of the non-carbon materials.

[0049] Among them, the non-carbon material is tin dioxide, and the mass ratio of three-dimensional porous graphene to tin dioxide is 1:2.

[0050] In the preparation method of this negative electrode material, the consumption of graphene oxide dispersion liquid is adjusted to 83.5mL, Na 2 S 2 o 3 ·5H 2 The consumption of O is adjusted to 0.10g, and the consumption of hydrochloric acid is adjusted to 1.5mL, and the rest are the same as in Example 1, and will not be repeated here.

Embodiment 3

[0052] The difference with embodiment 1 is:

[0053] The specific surface area of ​​the three-dimensional porous graphene-tin dioxide composite electrode material is 228m 2 / g, the pore volume is 0.21cm 3 / g, the bulk density is 2.32g / cm 3 , and the sum of the volumes of the pores in the negative electrode material is 2.25 times the sum of the volumes of the non-carbon materials.

[0054] Among them, the non-carbon material is tin dioxide, and the mass ratio of three-dimensional porous graphene to tin dioxide is 1:2.

[0055] In the preparation method of this negative electrode material, the consumption of graphene oxide dispersion liquid is adjusted to 82.5mL, Na 2 S 2 o 3 ·5H 2 The amount of O was adjusted to 0.21g, and the amount of hydrochloric acid was adjusted to 2.5mL. The rest are the same as in Embodiment 1, and will not be repeated here.

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Abstract

The invention belongs to the technical field of lithium-ion batteries, and particularly relates to a graphene-based negative electrode material for a lithium-ion battery. The negative electrode material is a three-dimensional porous graphene-non-carbon material composite electrode material and comprises three-dimensional porous graphene and a non-carbon material loaded on the three-dimensional porous graphene; and the negative electrode material has an abundant porous structure, the specific surface area is 170-400m<2> / g, the pore volume is 0.18-1.2cm<3> / g, the block density is 0.6-3.0g / cm<3>, and the volume sum of pores in the negative electrode material is 1.9-4 times of that of the non-carbon material. Compared with the prior art, the problem of volume expansion of a non-carbon active component in the material is solved; the density of the composite material is optimized; and the ion transmission property and electronic conductivity of the composite material are ensured. The material has the advantages of being novel in structure, good in conductivity, high in electrochemical lithium storage capacity and good in cycle performance; and meanwhile, the preparation method is simple, low in cost and suitable for industrialization.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to a graphene-based lithium ion battery negative electrode material with suitable reserved space. Background technique [0002] Due to the advantages of high energy density and good cycle performance, lithium-ion batteries have been widely used in portable electronic products, electric vehicles and power grids since their commercialization. Especially with the emergence of energy and environmental issues, lithium-ion batteries have received more and more attention in the development of new energy industries. [0003] The negative electrode of a lithium-ion battery is an important part of the battery, and its structure and performance directly affect the capacity, cycle performance, and rate performance of the lithium-ion battery. Among the anode materials for lithium-ion batteries today, graphite materials have been commercialized on a large scale. Graphi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/62H01M10/0525
CPCH01M4/362H01M4/62H01M4/625H01M10/0525H01M2004/021Y02E60/10
Inventor 杨全红韩俊伟孔德斌肖菁陶莹张辰游从辉
Owner TIANJIN UNIV
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