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High-thermal-conductivity flexible graphene composite material and preparation method therefor, and lithium ion battery

A lithium ion battery and composite material technology, which is applied in the field of lithium ion battery, high thermal conductivity flexible lithium ion battery negative electrode graphene composite material and its preparation field, can solve the problems of reducing electrode area, breaking or falling off, decreasing cycle life and the like, Achieve the effect of buffering volume expansion, high thermal conductivity, and increasing electrical conductivity

Inactive Publication Date: 2016-08-10
SHENZHEN INST OF ADVANCED TECH CHINESE ACAD OF SCI
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  • Summary
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Anode materials are one of the key factors limiting the development of lithium-ion batteries. In recent years, researchers have developed some high-performance anode materials, such as Si, Sn and other metals, SnO 2 , Fe 2 o 3 transition metal oxides, etc., but these negative electrode materials are facing a serious problem that the active material breaks or falls off from the pole piece due to the huge volume expansion and agglomeration of the active material during the cycle, resulting in pulverization, which deactivates the active material, and then Cycle life drops rapidly
[0003] In order to solve the problem of pulverization of negative electrode materials in the process of charging and discharging and further improve the structural stability of electrode materials, it is proposed to use nanostructures or special design structures to solve these problems, such as (1) design hollow nanostructures to buffer The problem of volume expansion, but the hollow structure reduces the volume density of the electrode. (2) Carbon coating technology is used to limit the volume expansion of the material and improve the conductivity of the active material. However, the carbon layer tightly coated on the surface of the material It is not the most suitable method to improve the huge volume expansion of the material. At the same time, the carbon layer on the surface of the active material also increases the diffusion distance of the electrolyte ions, which affects the improvement of the power density of the electrode material.
[0004] In addition, lithium-ion batteries will also generate a lot of heat during charging and discharging. If the heat cannot be dissipated in time, it will definitely affect the performance of the battery.
The traditional heat dissipation method of the battery is generally to add some radiators and other devices around the battery or reduce the area of ​​the electrode, etc., but these methods cannot dissipate the heat in a timely and effective manner.

Method used

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  • High-thermal-conductivity flexible graphene composite material and preparation method therefor, and lithium ion battery
  • High-thermal-conductivity flexible graphene composite material and preparation method therefor, and lithium ion battery
  • High-thermal-conductivity flexible graphene composite material and preparation method therefor, and lithium ion battery

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preparation example Construction

[0028] see figure 1 , a method for preparing a highly thermally conductive flexible lithium-ion battery negative electrode graphene composite material, comprising the steps of:

[0029] S110, soaking the graphite rod in the inorganic salt solution to fully infiltrate the graphite rod.

[0030] Specifically, use sandpaper to polish and decontaminate the surface of the graphite rod before use. The inorganic salt solution is selected from sodium stannate (Na 2 SnO 3 ) solution and potassium stannate (K 2 SnO 3 ) in one of the solutions. The concentration of the inorganic salt solution may be 0.1mol / L˜1mol / L. The anion stannate ion contained in sodium stannate and potassium stannate (SnO 3 2- ) is equivalent to the distance (0.34nm) between the graphite flakes, which can intercalate between the graphite flakes to reduce the Van der Waals force between the graphite flakes, which is beneficial to stripping and obtaining thin-layer graphene.

[0031] S120, using the graphite...

Embodiment 1

[0042] Use sandpaper to polish and decontaminate the surface of the graphite rod before use. Prepare 100 mL of Na with a concentration of 0.1 mol / L 2 SnO 3 solution, soak the graphite rod in Na 2 SnO 3 After the graphite rod is fully infiltrated by the solution for 1 h, the fully infiltrated graphite rod is used as the anode, the platinum sheet electrode is used as the cathode, and the Na 2 SnO 3 The solution is an electrolyte, which is assembled into an electrolytic cell system. A working voltage of 10V was applied between the cathode and the anode, and the electrochemical stripping was continued for 120min, and then the power was turned off to stop the stripping. After taking out the cathode and anode, the electrolyte was ultrasonically treated for 1 hour, and then centrifuged at 3000rmp / min for 20 minutes, and the remaining upper liquid was the graphene aqueous solution. The aqueous solution of graphene is vacuum filtered sequentially to obtain graphene / SnO 2 Composi...

Embodiment 2

[0049] Use sandpaper to polish and decontaminate the surface of the graphite rod before use. Prepare 100 mL of K with a concentration of 0.1 mol / L 2 SnO 3 solution, soak the graphite rod in K 2 SnO 3 After the graphite rod is fully infiltrated by the solution for 1 h, the fully infiltrated graphite rod is used as the anode, the platinum sheet electrode is used as the cathode, and the K 2 SnO 3 The solution is an electrolyte, which is assembled into an electrolytic cell system. A working voltage of 10V was applied between the cathode and the anode, and the electrochemical stripping was continued for 240min, and then the power was turned off to stop the stripping. After the cathode and anode were taken out, the electrolyte was ultrasonically treated for 1 hour, and then centrifuged at 1000rmp / min for 40 minutes, and the remaining upper liquid was the graphene aqueous solution. The aqueous solution of graphene is sequentially suction-filtered to obtain graphene / SnO 2 Compo...

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Abstract

The invention relates to a preparation method for a high-thermal-conductivity flexible lithium ion battery negative electrode graphene composite material. The preparation method comprises the following steps of enabling a graphite rod to be soaked in an inorganic salt solution to be fully wetted; taking the graphite rod as the positive electrode, taking a platinum sheet electrode as the negative electrode, and taking the inorganic salt solution as the electrolyte to be assembled into an electrolytic tank system, and applying a constant voltage between the negative electrode and the positive electrode to carry out electrochemical stripping; taking out the positive electrode and the negative electrode, and carrying out ultrasonic processing on the electrolyte; centrifuging the electrotype, taking the upper layer liquid to obtain a graphene / SnO<2> compound aqueous solution; and carrying out suction filtration on the graphene / SnO<2> compound aqueous solution to obtain the graphene composite material, wherein the inorganic salt solution is selected from one kind of a sodium stannate solution and a potassium stannate solution. The invention also provides the high-thermal-conductivity flexible lithium ion battery negative electrode graphene composite material and a lithium ion battery. The high-thermal-conductivity flexible lithium ion battery negative electrode graphene composite material and the lithium ion battery are relatively high in thermal dissipation and stability.

Description

technical field [0001] The invention relates to the technical field of lithium battery electrodes, in particular to a highly thermally conductive flexible lithium ion battery negative electrode graphene composite material, a preparation method thereof, and a lithium ion battery. Background technique [0002] Lithium-ion batteries have excellent comprehensive properties such as high working voltage, high energy density, long cycle life, light weight, and small self-discharge. As a new energy storage device for renewable energy, they are clean and pollution-free, and have been highly valued by governments in recent years. , has become one of the research hotspots and has developed rapidly in recent years. As the most potential driving energy for electric vehicles and hybrid vehicles in the future, lithium-ion batteries must have higher energy density, power density and good cycle stability. Anode materials are one of the key factors limiting the development of lithium-ion bat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/48H01M4/583H01M10/0525
CPCH01M4/366H01M4/48H01M4/583H01M10/0525Y02E60/10
Inventor 孙蓉赵波符显珠
Owner SHENZHEN INST OF ADVANCED TECH CHINESE ACAD OF SCI
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