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Self-supporting functional interlayer for lithium sulfur battery and preparation method of self-supporting functional interlayer

A self-supporting film and copper sulfide technology, applied in the field of material chemistry, can solve the problems of low coulombic efficiency of sulfur cathode, low conductivity of sulfur and lithium sulfide, and damage to the electrode structure, so as to achieve improved cycle stability, excellent rate performance, and specific The effect of large surface area

Active Publication Date: 2019-03-15
INT ACAD OF OPTOELECTRONICS AT ZHAOQING SOUTH CHINA NORMAL UNIV
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Problems solved by technology

[0003] Although lithium-sulfur batteries have been studied for decades, and some research results have been obtained in recent years, there is still a certain distance from the realization of industrialization.
There are some serious problems in the charging and discharging process of lithium-sulfur batteries. First, the conductivity of sulfur and lithium sulfide is low, and the volume of sulfur particles changes greatly during the charging and discharging process. Such changes will destroy the electrode structure; second, The generated intermediate polysulfide is highly soluble in the organic electrolyte, resulting in the loss of active materials and energy consumption; third, the dissolved polysulfide will diffuse to the cathode and react with the lithium cathode, forming a discharge product Li 2 S or Li 2 S 2 It will form a precipitate on the surface of the lithium cathode; fourth, the dissolved polysulfide is prone to shuttle effect
The shuttle effect and precipitation on the surface of the lithium cathode lead to low sulfur utilization, low coulombic efficiency and fast capacity fading of the sulfur cathode
In order to solve these problems, researchers at home and abroad have adopted many methods. Among them, adding a functional interlayer to the lithium-sulfur battery is an effective and simple method. The functional interlayer is placed between the positive electrode and the separator. It can physically or chemically fix the shuttling effect of polysulfides, which improves the utilization rate of positive active materials, thereby improving the overall performance of lithium-sulfur batteries. However, the traditional coating method is not practical in practice. In the application process, there are problems such as complex preparation process, difficult operation, and effective component falling off

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Embodiment 1

[0026] (1) Preparation of nitrogen-doped MXene:

[0027] Immerse the ground MAX phase ceramic powder in HF solution with a mass concentration of 40%, the mass ratio of ceramic powder to HF solution is 1:20, heat up to 60°C, stir magnetically for 18 hours, then centrifuge to obtain the product, and use deionized water Wash until neutral, and dry in an oven at 70°C for 18 hours to obtain MXene. The obtained MXene was placed in a tube furnace, heated to 400°C under an argon atmosphere, passed through ammonia gas, and kept for 30 minutes, then the ammonia gas was turned off, and cooled with the furnace under an argon atmosphere to obtain nitrogen-doped MXene. Wherein the MAX phase ceramic is Ti 3 AlC 2 . Get MXene material as Ti 3 C 2 T x .

[0028] (2) Preparation of nitrogen-doped MXene composite copper sulfide self-supporting film:

[0029] 0.8 g of copper sulfate, 0.8 g of thioacetamide and 1.5 g of the nitrogen-doped MXene prepared in step (1) were dissolved in 80 mL ...

Embodiment 2

[0033] (1) Preparation of nitrogen-doped MXene:

[0034]Immerse the ground MAX phase ceramic powder in HF solution with a mass fraction of 30%, the mass ratio of ceramic powder to HF solution is 1:30, heat up to 50°C, stir magnetically for 12 hours, then centrifuge to obtain the product, and use deionized water Wash until neutral, and dry in an oven at 60°C for 12 hours to obtain MXene. The obtained MXene was placed in a tube furnace, heated to 300°C under an argon atmosphere, passed through ammonia gas, and kept for 20 minutes, then the ammonia gas was turned off, and cooled with the furnace under an argon atmosphere to obtain nitrogen-doped MXene. Wherein the MAX phase ceramic is Ti 3 AlC 2 ,. Get MXene material as Ti 3 C 2 T x (T x are -OH, -F and other functional groups).

[0035] (2) Preparation of nitrogen-doped MXene composite copper sulfide self-supporting film:

[0036] 0.5 g of copper sulfate, 0.5 g of thioacetamide and 1 g of the nitrogen-doped MXene prepar...

Embodiment 3

[0038] (1) Preparation of nitrogen-doped MXene:

[0039] Immerse the ground MAX phase ceramic powder in HF solution (mass fraction is 50%), the mass ratio of ceramic powder to HF solution is 1:10), heat up to 90°C, stir magnetically for 24 hours, then centrifuge to obtain the product, use The MXene was obtained by washing with ionized water to neutrality and drying in an oven at 80°C for 24 hours. The obtained MXene was placed in a tube furnace, heated to 500°C under an argon atmosphere, passed through ammonia gas, and kept for 40 minutes, then the ammonia gas was turned off, and cooled with the furnace under an argon atmosphere to obtain nitrogen-doped MXene. Wherein the MAX phase ceramic can be Ti 3 AlC 2 . The obtained MXene material can be Ti 3 C 2 T x (T x are -OH, -F and other functional groups).

[0040] (2) Preparation of nitrogen-doped MXene composite copper sulfide self-supporting film:

[0041] 1 g of copper sulfate, 1 g of thioacetamide and 2 g of the nitr...

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Abstract

The invention relates to a functional interlayer for a lithium sulfur battery and a preparation method of the functional interlayer. MAX phase ceramic powder is adopted as a raw material, nitrogen-doped MXene is prepared firstly and then hydrothermal reaction is carried out to prepare a nitrogen-doped MXene composite copper sulfide self-supporting film. According to the preparation method, a preparation process of the functional interlayer is simplified, and meanwhile, a problem that effective components are crushed and fall off from a diaphragm during a battery circulation process after coating in a traditional method is also avoided. The nitrogen-doped MXene composite copper sulfide self-supporting film is used as the functional interlayer of the lithium sulfur battery and has the characteristics of good electrical conductivity, large specific surface area, multiple storage sites and high rate performance, the lithium polysulfide can be adsorbed, and the loss of active substances canbe effectively reduced.

Description

technical field [0001] The technical solution of the present invention relates to a functional interlayer for lithium-sulfur batteries and a preparation method thereof, in particular to a nitrogen-doped MXene composite copper sulfide self-sulphide prepared by first preparing nitrogen-doped MXene and then utilizing hydrothermal reaction. A supported thin film and a method thereof belong to the field of materials chemistry. Background technique [0002] The development of new energy vehicles has put forward higher and higher requirements on the performance of batteries. It is of great significance to develop new lithium-ion secondary energy storage batteries with high specific energy and environmental friendliness. Elemental sulfur has the highest specific capacity, in lithium / sulfur (Li / S) batteries, its theoretical specific capacity is as high as 1675 mAh g -1 , the theoretical specific energy is 2600 Wh kg -1 , than LiCoO in conventional Li-ion batteries 2 Waiting for th...

Claims

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Application Information

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IPC IPC(8): H01M2/14H01M2/16H01M50/403H01M50/431
CPCH01M50/431H01M50/403Y02E60/10
Inventor 张永光王加义
Owner INT ACAD OF OPTOELECTRONICS AT ZHAOQING SOUTH CHINA NORMAL UNIV
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