Sodium ion battery negative electrode material and preparation method thereof

A technology of sodium ion battery and negative electrode material, applied in battery electrodes, circuits, electrical components, etc., can solve the problems of high cost, difficulty in large-scale industrial production, and low capacity.

Inactive Publication Date: 2019-05-10
NINGBO RONBAY LITHIUM BATTERY MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] Chinese patent CN105185997A proposes a sodium ion battery negative electrode material prepared from coal and hard carbon precursors as raw materials, and its capacity is relatively low. The specific capacity of the negative electrode material obtained in the specific examples listed in this patent is mostly lower than 250mAh / g. The efficiency is about 80%; because it uses coal as a raw material, and coal is a soft carbon precursor, the carbon material obtained by pyrolysis has a low capacity, and it is difficult to obtain higher capacity sodium even if it is mixed with a hard carbon precursor and pyrolyzed at high temperature Ion battery anode material
However, purely using hard carbon precursors as raw materials for high-temperature pyrolysis can obtain anode materials with high capacity (>280mAh / g) and high first-cycle Coulombic efficiency (>85%), but the cost is high and it is difficult to produce on a large scale.

Method used

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  • Sodium ion battery negative electrode material and preparation method thereof
  • Sodium ion battery negative electrode material and preparation method thereof
  • Sodium ion battery negative electrode material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0120]First put 1 kg of anthracite particles in a high-temperature box-type carbonization furnace, with a particle size of about 1 mm. Under an argon atmosphere, raise the temperature to 1200 °C at a heating rate of 5 °C / min, and keep it at 1200 °C for 2 hours; then the obtained product After grinding through a 300-mesh screen, mix it with NaOH powder in a ball mill at a mass ratio of 1:1. The mixing time of the ball mill is 1 hour, and then place the mixed sample in a carbonization furnace again for high-temperature carbonization in an argon atmosphere. , the carbonization temperature is 800°C, the obtained carbonized product is soaked and cleaned with 3M / L hydrochloric acid for 0.5h, and then washed with a certain amount of deionized water until neutral, and then placed in a vacuum oven at 100°C Drying was carried out for 8 hours; another 1 kg of blocky corncobs was taken as a hard carbon precursor, and high-temperature carbonization was also carried out in a high-temperature...

Embodiment 2

[0126] First put 1 kg of anthracite particles in a high-temperature box-type carbonization furnace, with a particle size of about 1 mm. Under an argon atmosphere, raise the temperature to 1400 °C at a heating rate of 5 °C / min, and keep it at 1400 °C for 2 hours; then the obtained product After grinding through a 300-mesh sieve, the mass ratio of 1:1 and CaCO 3 The powders are mixed in a ball mill, and the mixing time of the ball mill is 1h, and then the mixed sample is placed in the carbonization furnace again, and high-temperature carbonization is carried out under an argon atmosphere, and the carbonization temperature is 700°C. Hydrochloric acid soaked and cleaned for 0.5h, then washed with a certain amount of deionized water until neutral, and then dried in a vacuum oven at 100°C for 8 hours; another piece of corn cob 1kg is used as the hard carbon precursor, and the high-temperature carbonization is carried out in the high-temperature carbonization furnace with argon as th...

Embodiment 3

[0129] First put 1 kg of anthracite particles in a high-temperature box-type carbonization furnace, with a particle size of about 1 mm. Under an argon atmosphere, raise the temperature to 1400 °C at a heating rate of 5 °C / min, and keep it at 1400 °C for 2 hours; then the obtained product After grinding through a 300-mesh sieve, mix it with sodium citrate powder in a ball mill at a mass ratio of 1:1. The mixing time of the ball mill is 1 hour, and then place the mixed sample in a carbonization furnace again, and carry out High-temperature carbonization, the carbonization temperature is 700°C, the obtained carbonized product is taken out and soaked and cleaned with 3M / L hydrochloric acid for 0.5h, then washed with a certain amount of deionized water until neutral, and then placed in a vacuum oven at 100°C The drying time was 8 hours under the same conditions; another 1 kg of blocky corncobs was used as a hard carbon precursor, and high-temperature carbonization was also carried o...

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Abstract

The invention discloses a sodium ion battery negative electrode material and a preparation method thereof, and the preparation method comprises a preparation method (1) or a preparation method (2). The preparation method (1) is: firstly activating the soft carbon and then coating the hard carbon; the preparation method (2) is: firstly activating the hard carbon and then coating the soft carbon. The preparation method firstly introduces a large number of developed pore structures by activating the soft carbon/hard carbon to provide more storage space for sodium ions, which is favorable for theincrease of material capacity; then the coating of a hard carbon/soft carbon precursor can effectively cover the defects and edge faces caused by the activation, reduce the irreversible capacity losscaused by the insertion and removal of sodium ions, and effectively improve the first-week coulomb efficiency. The sodium ion battery negative electrode material of the invention has the advantages oflow cost, high capacity and high first-week coulomb efficiency, and high cost performance; in addition, the preparation method of the invention is simple and suitable for commercial application.

Description

technical field [0001] The invention relates to the technical field of sodium ion batteries, in particular to a negative electrode material for a sodium ion battery and a preparation method thereof. Background technique [0002] The development and application of high-performance and low-cost anode materials is an important prerequisite for the commercialization of sodium-ion batteries. Graphite has been widely used as an anode material in lithium batteries, but graphite is difficult to use as an anode in sodium-ion batteries due to thermodynamic reasons and its inherent structure. [0003] The commonly used anodes for sodium-ion batteries that can be commercialized on a large scale are generally hard carbons, but the prepared hard carbon materials have poor electrochemical performance, the capacity is generally <300mAh / g, and the Coulombic efficiency in the first week is generally less than 80%, and it is difficult to obtain both the first and the first. Zhou Coulombic ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/62
CPCY02E60/10
Inventor 程博田光磊刘瑞佘圣贤
Owner NINGBO RONBAY LITHIUM BATTERY MATERIAL CO LTD
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