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Negative electrode material, preparation method thereof and sodium ion battery

A negative electrode material and ion technology, applied in the fields of sodium ion batteries, negative electrode materials and their preparation, to achieve the effects of improving cycle stability, slowing down volume expansion, and improving rate performance

Pending Publication Date: 2022-01-14
SHENZHEN INST OF ADVANCED TECH CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of this application is to provide a negative electrode material and its preparation method and sodium ion battery, aiming to solve the technical problem of how to simultaneously improve the conductivity of transition metal sulfides and reduce volume expansion

Method used

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  • Negative electrode material, preparation method thereof and sodium ion battery
  • Negative electrode material, preparation method thereof and sodium ion battery
  • Negative electrode material, preparation method thereof and sodium ion battery

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preparation example Construction

[0032] The second aspect of the embodiment of the present application provides a method for preparing a negative electrode material, the preparation method comprising the following steps:

[0033] S01: dissolving the transition metal salt and nitrogen-containing sulfur source in a solvent, and performing drying treatment to obtain a precursor;

[0034] S02: Put the precursor and the selenium powder in the same container, and then calcinate to obtain the negative electrode material.

[0035] The composite material provided in the examples of the present application is synthesized by a one-step high-temperature solid-phase method, and the steps of the preparation method are simple and easy, and can be prepared in batches. Through this preparation method, the prepared transition metal sulfide can be doped with nitrogen ions and selenium ions at the same time, and by taking advantage of the advantages of the two anions of nitrogen and selenium, the capacity of the transition metal...

Embodiment 1

[0061] A nitrogen-selenium dianion doped Co 9 S 8 (N,Se-Co 9 S 8 ) preparation of negative electrode material

[0062] In this embodiment, cobalt chloride hexahydrate is used as the soluble metal salt, thiourea is used as the source of nitrogen and sulfur, the solvent is absolute ethanol, and the source of selenium is selenium powder. Concrete preparation process is as follows:

[0063] Add 1.9g of cobalt chloride hexahydrate and 0.37g of thiourea into 100mL of absolute ethanol, stir until a completely uniform solution is formed, then stir and evaporate to dryness under heating at 75°C, and dry the evaporated sample in a vacuum oven at 65°C After 24 hours, the precursor was obtained for use. Then grind the precursor into powder, put it into a porcelain boat and place it downstream of the tube furnace, then weigh 1g of selenium powder and put it into another porcelain boat and place it upstream of the tube furnace, then pass in argon as a protective gas, The heating rate ...

Embodiment 2-5

[0067] Cobalt sulfides with different valences prepared based on different amounts of thiourea

[0068] N in embodiment 2-5 and embodiment 1, Se-Co 9 S 8 The negative electrode preparation process steps are the same, the difference is that the raw material molar ratios of cobalt chloride hexahydrate and thiourea are different, and the raw material molar ratios used are respectively 1:4, 1:2.6, 1:2.3, 1:2, for example 2 The negative electrode material of -5 was tested for half-cell electrochemical performance, and compared with Example 1, the test results are shown in Table 1.

[0069] Table 1

[0070]

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Abstract

The invention relates to the technical field of battery materials, in particular to a negative electrode material, a preparation method thereof and a sodium ion battery. The negative electrode material comprises a transition metal sulfide, and nitrogen ions and selenium ions doped in the transition metal sulfide. The intrinsic conductivity of the transition metal sulfide can be improved through nitrogen doping, an ion transmission channel can be expanded through introduction of selenium, and through the advantages of nitrogen and selenium anions, the rate capability and cycling stability of the transition metal sulfide negative electrode material are improved while the capacity of the transition metal sulfide negative electrode material is not reduced, so that the negative electrode material has a very good application prospect.

Description

technical field [0001] The application belongs to the technical field of battery materials, and in particular relates to a negative electrode material, a preparation method thereof and a sodium ion battery. Background technique [0002] Lithium-ion batteries are widely used in portable energy storage, electric vehicles and other fields because of their advantages such as high energy density, long life, high charge and discharge efficiency, and low pollution. However, due to the scarcity and uneven distribution of key materials for lithium-ion batteries, such as Li, the price has been rising year after year. In contrast, sodium is abundant and has the most similar chemical properties to lithium, so sodium-ion batteries have been extensively studied and considered to be the most likely energy storage system to replace lithium-ion batteries. Sodium-ion batteries are also mainly composed of positive electrodes, electrolytes and negative electrodes, and their electrode materials...

Claims

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Application Information

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IPC IPC(8): H01M4/58H01M4/62H01M10/054C01G51/00C01G53/11C01G3/12C01G49/12C01G45/00C01G39/06C01G31/00C01G23/00C01G9/08C01G41/00
CPCH01M4/5815H01M4/624H01M4/628H01M10/054C01G51/30C01G53/11C01G3/12C01G49/12C01G45/00C01G39/06C01G31/00C01G23/007C01G9/08C01G41/00C01P2004/03C01P2006/40H01M2004/021H01M2004/027Y02E60/10
Inventor 唐永炳张晓明薛松章罗江蒋春磊
Owner SHENZHEN INST OF ADVANCED TECH CHINESE ACAD OF SCI
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