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Binary transition metal sulfide material and application thereof

A transition metal, sulfide technology, applied in chromium compounds, inorganic chemistry, electrical components, etc., can solve the problems of irreversible loss of active materials sulfur and lithium, limited effect, low conductivity of lithium sulfide, etc., to promote electrochemical reactions. , Improve the discharge specific capacity and reduce the effect of the impact

Pending Publication Date: 2022-01-18
TIANMU LAKE INST OF ADVANCED ENERGY STORAGE TECH CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, the following two main problems of the sulfur cathode limit the application of lithium-sulfur batteries:
[0004] ① The conductivity of elemental sulfur and its discharge product lithium sulfide is extremely low, which makes the kinetics of the electrode process slow, and there is an obvious energy barrier during charging, which ultimately leads to low utilization of the active material sulfur
[0005] ② Shuttle effect causes irreversible loss of active materials sulfur and lithium
[0009] However, the above methods can only restrict lithium polysulfide from the aspects of blocking and adsorption, and the inhibition of the shuttle effect can be delayed but not weakened, and the effect is limited.

Method used

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  • Binary transition metal sulfide material and application thereof
  • Binary transition metal sulfide material and application thereof
  • Binary transition metal sulfide material and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0077] This embodiment provides a novel binary transition metal sulfide material V 0.1 Cr 0.9 S 2 The preparation process, containing V 0.1 Cr 0.9 S 2 The preparation process of the sulfur electrode and the lithium-sulfur battery using the electrode, the preparation process comprises the following steps:

[0078] 1. According to the following equation, with 1g of product V 0.1 Cr 0.9 S 2 Calculate the mass of the reactant for the target.

[0079] Na 2 S+0.2V+1.8Cr+3S→2NaV 0.1 Cr 0.9 S 2

[0080] Put the reactant into an agate ball mill jar, and mill it on a ball mill (ball-to-material ratio: 2:1) for 1 hour to mix the reactant evenly. Then the ball-milled sample was pressed into a sheet and transferred to a corundum boat. In an argon-protected tube furnace, the temperature was raised to 200°C at 5°C / min, kept for 6h, and then the temperature was raised to 900°C at 5°C / min. , keep warm for 8h, after natural cooling, grind to get powdered NaV 0.1 Cr 0.9 S 2 . I...

Embodiment 2

[0091] This embodiment provides a novel binary transition metal sulfide material V 0.3 Cr 0.7 S 2 The preparation process, containing V 0.3 Cr 0.7 S 2 The preparation process of the sulfur electrode and the lithium-sulfur battery using the electrode, the preparation process comprises the following steps:

[0092] 1. According to the following equation, with 1g of product V 0.3 Cr 0.7 S 2 Calculate the mass of the reactant for the target.

[0093] Na 2 S+0.6V+1.4Cr+3S→2NaV 0.3 Cr 0.7 S 2

[0094] Put the reactant into an agate ball mill jar, and mill it on a ball mill (ball-to-material ratio: 2:1) for 1 hour to mix the reactant evenly. Then the ball-milled sample was pressed into a sheet and transferred to a corundum boat. In an argon-protected tube furnace, the temperature was raised to 200°C at 5°C / min, kept for 6h, and then the temperature was raised to 900°C at 5°C / min. , keep warm for 8h, after natural cooling, grind to get powdered NaV 0.3 Cr 0.7 S 2 . I...

Embodiment 3

[0105] This embodiment provides a novel binary transition metal sulfide material V 0.7 Cr 0.3 S 2 The preparation process, containing V 0.7 Cr 0.3 S 2 The preparation process of the sulfur electrode and the lithium-sulfur battery using the electrode, the preparation process comprises the following steps:

[0106] 1. According to the following equation, with 1g of product V 0.7 Cr 0.3 S 2 Calculate the mass of the reactant for the target.

[0107] Na 2 S+1.4V+0.6Cr+3S→2NaV 0.7 Cr 0.3 S 2

[0108] Put the reactant into an agate ball mill jar, and mill it on a ball mill (ball-to-material ratio: 2:1) for 1 hour to mix the reactant evenly. Then the ball-milled sample was pressed into a sheet and transferred to a corundum boat. In an argon-protected tube furnace, the temperature was raised to 200°C at 5°C / min, kept for 6h, and then the temperature was raised to 900°C at 5°C / min. , keep warm for 8h, after natural cooling, grind to get powdery NaV 0.7 Cr 0.3 S 2 .

...

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Abstract

The invention provides a binary transition metal sulfide material which is sulfide of transition metal vanadium and chromium, the chemical formula is VxCr1-xS2, and x is more than 0 and less than 1. The binary transition metal sulfide material can improve the conductivity of a sulfur positive electrode, is bonded with lithium polysulfide to realize chemical adsorption and catalytic electrochemical conversion reaction of lithium polysulfide, and realizes controllable deposition of Li2S2 / Li2S, so that the specific discharge capacity, the capacity retention ratio and the cycling stability of the lithium-sulfur battery are remarkably improved finally, and the material has a good application prospect in a sulfur positive electrode lithium-sulfur battery.

Description

technical field [0001] The invention relates to the technical field of electrode materials, in particular to a novel binary transition metal sulfide material and its application. Background technique [0002] The high-performance lithium-sulfur battery using lithium metal as the negative electrode and elemental sulfur as the positive electrode has extremely high energy density (2500Wh / kg) and theoretical specific capacity (1675mA h / g), and the positive electrode active material sulfur is cheap, easy to obtain and abundant in resources. In line with the requirements of renewable and clean energy development, lithium-sulfur batteries are therefore considered to be one of the most valuable next-generation high-energy-density energy storage devices. [0003] However, the following two main problems of the sulfur cathode limit the application of lithium-sulfur batteries: [0004] ① The conductivity of elemental sulfur and its discharge product lithium sulfide is extremely low, w...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G37/00H01M4/13H01M4/139H01M4/62H01M10/052
CPCC01G37/006H01M4/628H01M4/624H01M4/13H01M4/139H01M10/052C01P2002/72C01P2006/40Y02E60/10
Inventor 刘丽露
Owner TIANMU LAKE INST OF ADVANCED ENERGY STORAGE TECH CO LTD
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