Soft and hard carbon composite porous negative electrode material for sodium-ion battery and preparation method thereof

A sodium-ion battery and negative electrode material technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve problems such as poor cycle stability, reversibility of rate performance, etc., to improve rate performance, facilitate deintercalation, and large ratio The effect of capacity
CN111293301AActive Publication Date: 2020-06-16JIANGSU UNIV OF SCI & TECH
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
JIANGSU UNIV OF SCI & TECH
Publication Date
2020-06-16

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Abstract

The invention discloses a soft and hard carbon composite porous negative electrode material for a sodium-ion battery and a preparation method thereof. The soft and hard carbon composite porous negative electrode material is prepared by regulating and controlling cobalt nitrate, dimethylimidazole and polyvinyl alcohol. The preparation method comprises the steps of dropwise adding an ethanol solution of dimethylimidazole into an ethanol solution of cobalt nitrate, and stirring at room temperature to form a precursor ZIF-67 solution; and adding polyvinyl alcohol into the solution, refluxing to form gel, naturally cooling, freeze-drying, and placing in an inert gas atmosphere at 700 to 1100 DEG C for 2 to 5 hours to obtain the negative electrode material. The composite negative electrode material prepared by the invention combines the advantages of excellent conductivity of soft carbon and high capacity of hard carbon, so that the stability of the battery is effectively improved, and the cycle performance and coulombic efficiency of the sodium-ion battery are improved. The method has the advantages of stable raw material components, simple process operation and high repeatability, andis beneficial to industrial production.
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Description

technical field

[0001] The invention relates to a soft and hard carbon composite porous negative electrode material for a sodium ion battery and a preparation method thereof, belonging to the technical field of new materials. Background technique

[0002] In recent years, rechargeable lithium-ion batteries (LIBs) have become the mainstream of electrochemical energy storage devices due to their high energy density and long service life, playing an important role in smart grids, electric vehicles, and personal electronic devices. However, due to the scarcity and high safety of lithium resources, people are still looking for better substitutes [Nano Lett., 2012, 12, 3783.]. In contrast, sodium resources are less expensive, and rechargeable sodium-ion batteries (SIBs) have similar chemical / electrochemical properties to established lithium-ion batteries, so they can replace lithium-ion batteries (LIBs) and lead-acid batteries. For large-scale energy storage equipment [J. Electro...

Claims

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