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Lithium-ion battery anode material molybdenum disulfide/carbon and preparation method thereof

A lithium-ion battery and negative electrode material technology, applied in the field of lithium-ion battery negative electrode material molybdenum disulfide/carbon and its preparation, can solve the problems of low cycle stability, capacity loss, poor cycle stability, etc., and achieve strong operability, High specific capacity, simple and reliable method

Active Publication Date: 2015-11-11
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, its cycle stability is extremely low due to its low electronic / ionic conductivity and severe volume expansion during the lithium-deintercalation process.
In addition, during the battery reaction, MoS 2 with Li + A reaction occurs to form insoluble Li 2 S, Li 2 S also catalyzes the decomposition of the electrolyte to form a thick polymer layer leading to irreversible capacity loss, which is also the reason for its poor cycle stability.

Method used

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  • Lithium-ion battery anode material molybdenum disulfide/carbon and preparation method thereof
  • Lithium-ion battery anode material molybdenum disulfide/carbon and preparation method thereof
  • Lithium-ion battery anode material molybdenum disulfide/carbon and preparation method thereof

Examples

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Embodiment 1

[0041] A lithium ion battery negative electrode material molybdenum disulfide / carbon (MoS 2 / C), the reaction raw material consists of ammonium tetrathiomolybdate 0.250g, cetyltrimethylammonium bromide 0.050g, silicon dioxide nanosphere 0.100g (the ratio of the amount of the three substances is 1:0.143:1.733 ) and absolute ethanol 30ml to prepare MoS 2 / C reaction raw material;

[0042] 1) The MoS 2 The reaction raw materials of the / C composite material are stirred at room temperature until the solvent is completely evaporated, and the remaining powder is dried at 50-65°C;

[0043] 2) Place the dried powder described in step 1) in a mixed atmosphere with a volume ratio of argon and hydrogen of 9.5:0.5, heat it in a tube furnace at 700-800°C for 4 hours, and cool naturally to room temperature to obtain a black powder ;

[0044] 3) Treat the black powder described in step 3 with a concentration of 5 to 6% hydrofluoric acid to remove SiO 2 , the final product MoS was obtaine...

Embodiment 2

[0053] The difference between this embodiment and Example 1 is that the reaction raw materials are: ammonium tetrathiomolybdate 0.250g, cetyltrimethylammonium bromide 0.100g, silica nanospheres 0.100g (the amount of the three substances The ratio is 1:0.286:1.733) and absolute ethanol 30ml, and others are identical with embodiment 1.

Embodiment 3

[0055] This embodiment is different from Example 1 in that in step 1, ammonium tetrathiomolybdate 0.250g, cetyltrimethylammonium bromide 0.150g, silica nanosphere 0.100g (the amount of the three substances Ratio is 1:0.429:1.733) and absolute ethanol 30ml, other is identical with embodiment 1.

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Abstract

The invention discloses a lithium-ion battery anode material molybdenum disulfide / carbon and a preparation method thereof. A dry tremella-like MoS2 / C composite material is prepared by a thermal reduction method; a half-battery is prepared; the electrochemical property of the half-battery is tested; and the result shows that the half-battery is high in specific capacity and stable in cycle performance. The method is simple, reliable, good in process repeatability and high in operability, and can be widely popularized. The preparation method comprises the following steps: (1), taking a proper amount of ammonium tetrathiomolybdate, hexadecyl trimethyl ammonium bromide and silica nanospheres as raw materials; (2), preparing a sample by the thermal reduction method; and (3), removing silicon dioxide with hydrofluoric acid to obtain the required product.

Description

technical field [0001] The invention relates to a lithium ion battery negative electrode material and a preparation method thereof, in particular to a lithium ion battery negative electrode material molybdenum disulfide / carbon (MoS 2 / C) and its preparation method. Background technique [0002] The achievements of human progress and social development at the present stage mainly rely on traditional fossil energy such as oil and coal to a large extent. With the continuous consumption and incomplete use of these non-renewable energy sources, the whole world is facing energy crisis and serious environmental pollution problems. Words such as the global greenhouse effect, ecological imbalance, and smog have become familiar in recent years. How to solve these problems has become a huge challenge for the development of science and technology. Therefore, the development of clean and renewable new energy has become a research hotspot. Among them, renewable energy such as solar ene...

Claims

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Application Information

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IPC IPC(8): H01M4/58H01M10/0525
CPCH01M4/58H01M4/5815H01M10/0525Y02E60/10
Inventor 王增梅蔡亚菱
Owner SOUTHEAST UNIV
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