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Graphene oxide/lithium titanate composite negative electrode material for lithium-ion battery and preparation method of graphene oxide/lithium titanate composite negative electrode material

A technology for lithium ion batteries and negative electrode materials, which is applied in the field of lithium ion batteries, can solve the problems of graphene's non-adhesiveness, decreased specific capacity, and large consumption of lithium ions, and achieves excellent electrochemical performance, high specific capacity and efficiency. , the effect of cheap and easy-to-obtain raw materials

Inactive Publication Date: 2017-02-22
CHENGDU ORGANIC CHEM CO LTD CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, graphene due to its large theoretical specific surface area (2630m 2 / g), a large amount of lithium ions will be consumed when forming a solid electrolyte interface film, and at the same time, the large specific surface area also makes it easy to agglomerate. It has binding properties, and 10% binder is needed as a composite negative electrode material, so that the electrode active material only accounts for 80% of the total mass of the electrode

Method used

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  • Graphene oxide/lithium titanate composite negative electrode material for lithium-ion battery and preparation method of graphene oxide/lithium titanate composite negative electrode material
  • Graphene oxide/lithium titanate composite negative electrode material for lithium-ion battery and preparation method of graphene oxide/lithium titanate composite negative electrode material
  • Graphene oxide/lithium titanate composite negative electrode material for lithium-ion battery and preparation method of graphene oxide/lithium titanate composite negative electrode material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Weigh 5.0 grams of graphene oxide sol (such as figure 1 Shown), its solid content is 1.71%, add 50 milliliters of deionized water, obtain the graphene oxide dispersion liquid after ultrasonication for subsequent use. Weigh 0.425 gram of lithium titanate powder (such as figure 2 shown), add 50 ml of absolute ethanol, and obtain a lithium titanate suspension after ultrasonication for later use. Slowly add the lithium titanate suspension to the graphene oxide dispersion (reverse addition has the same effect), stir continuously with a magnet during the dropwise addition, then move it into the reactor, heat and evaporate in an oil bath at 70°C for 2 hours, Make most of ethanol and moisture volatilize, obtain the slurry of graphene oxide / lithium titanate composite negative electrode material (such as image 3 , Figure 4 shown), wherein the mass percent ratio of graphene oxide to lithium titanate is 17%:83%.

[0029] Electrode preparation and testing:

[0030] The prepa...

Embodiment 2

[0033] The mass percent ratio of graphene oxide and lithium titanate was adjusted to 12%:88%, and other steps were the same as in Example 1. The result is as Image 6 It is shown that when the mass percentage ratio of graphene oxide and lithium titanate is adjusted from 17%:83% to 12%:88%, the specific capacity of the first lithium insertion and delithiation of the composite negative electrode material has increased. And, after passing through 1C, 2C, 5C, after the charge-discharge cycle test under 10C and 20C current density, after returning to the current density of 1C, the composite negative electrode material in the present embodiment still has 194mAh / g (12%: 88%) delithiation specific capacity (graphene oxide consumption reduces, but composite negative electrode material specific capacity does not reduce), illustrates that graphene oxide does not fully play a role in embodiment 1.

[0034] The charge-discharge cycle performance of composite negative electrode material in...

Embodiment 3

[0036] The mass percent ratio of graphene oxide and lithium titanate was adjusted to 9%:91%, and other steps were the same as in Example 1. The result is as Figure 8 It can be seen that when the amount of graphene oxide used in the composite negative electrode material gradually decreases, the specific capacity of the composite negative electrode material for the first lithium insertion and delithiation increases significantly. This may be because graphene oxide sheets are easy to stack. When the equivalent weight is large, the graphene oxide sheets are stacked on each other, which is not conducive to the intercalation and extraction of lithium ions. However, when the amount of graphene oxide is reduced, LTO can fully stretch the graphene oxide, providing a wider "channel" for lithium ions, making it easy to extract lithium ions after intercalation, so the delithiation specific capacity is higher.

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Abstract

The invention discloses a graphene oxide / lithium titanate composite negative electrode material for a lithium-ion battery and a preparation method of the graphene oxide / lithium titanate composite negative electrode material. The composite negative electrode material is formed by compounding graphene oxide and lithium titanate; and the mass percentage of the graphene oxide is 1%-90% and the mass percentage of the lithium titanate is 10%-99%. The preparation method of the composite negative electrode material comprises the steps of slowly dropwise adding graphene oxide sol or a graphene oxide dispersion liquid to a suspension liquid of the lithium titanate, and achieving homogeneous compounding of the graphene oxide and the lithium titanate under the help of agitation or ultrasonic dispersion to obtain slurry of the graphene oxide composite negative electrode material. The slurry can directly coat to form an electrode slice after a conductive agent is added; and an adhesive is not needed. The composite negative electrode material disclosed by the invention has relatively high reversible specific capacity, cycle stability and excellent rate charge-discharge property.

Description

technical field [0001] The invention belongs to the field of lithium ion batteries, and relates to a lithium ion battery negative electrode material and a preparation method thereof. Background technique [0002] As a new generation of green high-energy batteries, lithium-ion batteries have the advantages of small weight, high energy density, long cycle life, high working voltage, no memory effect, and no environmental pollution. They have been widely used in portable electronics such as mobile phones, notebook computers, and cameras. Among the equipment, it is also the preferred power source for electric vehicles and hybrid electric vehicles in the future, and has broad application prospects. [0003] Anode materials are one of the key components of lithium-ion batteries. Spinel lithium titanate (Li 4 Ti 5 o 12 ) is expected to become the anode material of a new generation of lithium-ion power batteries due to its good safety and cycle stability. However Li 4 Ti 5 o ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/58H01M4/62H01M10/0525
CPCH01M4/362H01M4/58H01M4/625H01M10/0525Y02E60/10
Inventor 瞿美臻谢正伟
Owner CHENGDU ORGANIC CHEM CO LTD CHINESE ACAD OF SCI
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