High-capacity carbon nanotube composite cobalt sulfide negative electrode material and preparation and application thereof

A carbon nanotube composite and negative electrode material technology, applied in the direction of nanotechnology, nanotechnology, nanotechnology for materials and surface science, etc., can solve the problem of reducing the reversible capacity and cycle stability of electrode materials, volume expansion of electrode materials, structure collapse and other problems, to achieve the effect of improving reaction kinetics performance, electrochemical performance, and capacity fading
CN107978745AActive Publication Date: 2018-05-01SOUTH CHINA NORMAL UNIVERSITY
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
SOUTH CHINA NORMAL UNIVERSITY
Publication Date
2018-05-01

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Abstract

The invention discloses a high-capacity carbon nanotube composite cobalt sulfide negative electrode material and preparation and application thereof, and belongs to the technical field of a lithium ion battery. A rod-shaped cobalt-containing precursor is generated by hydrolysis reaction of crystal water contained in cobalt acetate tetrahydrate and cobalt acetate, the size of the cobalt-containingprecursor is limited to obtain a nanometer rod-shaped precursor under an effect of PVP, TAA reacts with the precursor to generate nanometer rod-shaped cobalt sulfide, the crystallization property of the material can be improved during the subsequent sintering process, the nanometer material of a carbon nanotube is uniformly combined, the reduction of the internal resistance and the electron transmission are facilitated, and the electrochemical performance is greatly improved. A freeze drying technology is used, the problem that the carbon nanotube is easy to agglomerate is effectively prevented, the obtained carbon nanotube composite CoS negative electrode material has high specific capacity, high charge-discharge capacity and high initial coulombic efficiency, and the capacity attenuationsituation can be remarkably improved.
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Description

Technical field

[0001] The invention belongs to the technical field of lithium ion batteries, and specifically relates to a high-capacity carbon nanotube composite cobalt sulfide negative electrode material and a preparation method and application thereof. Background technique

[0002] Lithium-ion batteries have been widely used in many fields because of their high working voltage, high specific capacity, good cycle performance, fast charging, memory effect, and environmental protection. Commercial lithium-ion batteries still use carbon materials as negative electrode materials, but the capacity of this material in actual batteries is relatively low (theoretical capacity is only 372mAh / g), which can no longer meet people's needs. Therefore, the development of anode materials with higher capacity is of great significance to the development of lithium-ion batteries. Due to transition metal sulfides (MoS 2 , FeS, NiS, CoS 2 Etc.) has a very high specific capacity, and more and more...

Claims

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