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High-capacity potassium ion battery negative electrode material and preparation method and application thereof

A battery anode, potassium ion technology, applied in battery electrodes, nanotechnology for materials and surface science, negative electrodes, etc., can solve the problems of unfavorable capacity, poor electrical conductivity, high energy consumption, etc., and achieve excellent cycle performance, Excellent rate performance, solving the effect of low capacity

Active Publication Date: 2018-04-10
INST OF CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As a tin-based, SnS 2 Facing the common problem faced by all alloy anode materials, that is, large volume deformation will be caused in the process of intercalation and deintercalation of potassium, which will lead to the instability of the interface solid electrolyte film (SEI), and the pulverization of particles will fall off from the current collector. , further leading to rapid capacity decay
On the other hand, as a sulfide, SnS 2 It has poor electrical conductivity, which is not conducive to the full play of capacity
Moreover, currently SnS 2 The main preparation method of composite graphene is to carry out hydrothermal reaction under the condition of high temperature (>120°C). For example, Chinese patent (CN102142549A) discloses a synthesis of SnS 2 / graphene composite; Chinese patent (CN105869893A) discloses a method of synthesizing SnS at 180-200°C 2 / graphene composites; high-temperature hydrothermal synthesis has problems such as high energy consumption and high equipment requirements, and when the synthesized composites are used as negative electrode materials for potassium-ion batteries, the above-mentioned SnS still exists 2 There are many problems that need to be improved

Method used

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  • High-capacity potassium ion battery negative electrode material and preparation method and application thereof
  • High-capacity potassium ion battery negative electrode material and preparation method and application thereof
  • High-capacity potassium ion battery negative electrode material and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] Example 1 Nano SnS 2 / Preparation of graphene composites

[0044] This embodiment provides a nano SnS 2 The preparation of / graphene composite material comprises the steps:

[0045] a, tin tetrachloride pentahydrate (SnCl 4 ·5H 2 0) Dissolve 1.4g (4mmol) source in 80ml, 1.5mg / mL graphene aqueous solution, stir magnetically or sonicate for 30min until it is completely dissolved to form a homogeneous solution.

[0046] b. Then, add 0.6 g (~8 mmol) of thioacetamide to the above solution, stir magnetically or sonicate for a period of time until the thioacetamide is completely dissolved to form a uniform solution.

[0047] c. Add 0.1 g of ethylenediamine to the above solution, and stir magnetically or sonicate for 30 minutes until it is completely dissolved to form a uniform solution.

[0048] d. Transfer the solution obtained in c to a 50ml hydrothermal reaction kettle, and conduct a hydrothermal reaction at 100°C for 6h.

[0049] e. After hydrothermal treatment, cool...

Embodiment 2

[0054] Example 2 Potassium ion battery negative electrode sheet preparation and battery assembly

[0055] This embodiment provides a method for preparing a negative pole piece of a potassium ion battery and assembling the battery, including:

[0056] a, the resulting SnS 2 / Graphene composite material, conductive agent Super P, and binder sodium alginate are mixed according to the mass ratio of 85:5:10, and a few drops of deionized water are added, and after mechanical stirring to form a uniform slurry, it is coated Spread it on the copper foil, and then dry it at 80°C for 10h under vacuum condition to get the dried electrode sheet.

[0057] b. Cut the dried electrode sheet into a circular electrode sheet with a diameter of 10 nm.

[0058] c. Use the circular electrode sheet prepared above as the negative electrode, the glass fiber diaphragm as the diaphragm, and pack the metal potassium sheet into a button battery. The model of the button battery is CR2032, and the concentr...

Embodiment 3

[0062] Example 3 Nano SnS 2 / Preparation of graphene composites

[0063] Proceed as follows:

[0064] a, tin tetrachloride pentahydrate (SnCl 4 ·5H 2 0) Dissolve 0.7g (~2mmol) source in 80ml, 1.5mg / L graphene aqueous solution, stir magnetically or sonicate for 30min until it is completely dissolved to form a homogeneous solution.

[0065] b. Then, add 0.32 g (~2 mmol) of sodium thiosulfate to the above solution, stir magnetically or ultrasonically for a period of time until the sodium thiosulfate is completely dissolved and a uniform solution is formed.

[0066] c. Add 0.1 g of ethylenediamine to the above solution, and stir magnetically or sonicate for 30 minutes until it is completely dissolved to form a uniform solution.

[0067] d. Transfer the solution obtained in c to a 50 ml hydrothermal reaction kettle, and conduct a hydrothermal reaction at 95° C. for 6 h.

[0068] e. After hydrothermal treatment, cool to normal temperature, centrifuge, wash, and dry, and treat ...

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Abstract

The invention provides a high-capacity potassium ion battery negative electrode material and a preparation method and application thereof. A potassium ion battery prepared from a nano SnS2 / graphene composite electrode material can obtain the high reversible specific capacity of 714 mAh / g, and has excellent rate capability and cycle performance. Under the condition that the current density is 500 mA / g, the battery can still give play to the reversible capacity of 483 mA / g; under the condition of 50 circles of circulation at the current density of 250 mA / g, the reversible capacity of 464 mAh / g can still be kept, and the bottleneck problem of low capacity of a conventional potassium ion battery is effectively solved.

Description

technical field [0001] The invention relates to the technical field of potassium ion battery materials, in particular to a high-capacity nano SnS 2 / Graphene potassium ion battery negative electrode material and its preparation method and application. Background technique [0002] Energy crisis and environmental pollution are serious problems facing mankind at present and for a long time to come. The depletion of fossil fuels and the pollution caused by their combustion have drawn increasing attention. At present, global energy technology is facing unprecedented major changes; developing and utilizing clean energy conversion and storage technologies to replace fossil energy with clean energy to cope with acute climate deterioration and severe air pollution has become a research hotspot and difficulty in recent years. The natural world is rich in clean energy resources, including wind energy, solar energy, nuclear energy, etc. How to convert and store these clean energy re...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/58H01M4/62H01M10/054B82Y30/00
CPCB82Y30/00H01M4/362H01M4/5815H01M4/625H01M10/054H01M2004/021H01M2004/027Y02E60/10
Inventor 曹安民宾德善万立骏
Owner INST OF CHEM CHINESE ACAD OF SCI
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