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Lithium ion battery cathode material and preparation method thereof

A technology for lithium ion batteries and negative electrode materials, applied in the fields of electrochemistry and material synthesis, can solve the problems of inability to intercalate or deintercalate lithium ions, rapid volume expansion of intercalated lithium, poor cycle stability, etc., and achieve good cycle stability and rate performance. , Good crystallinity and high uniformity

Inactive Publication Date: 2018-10-30
CHINA JILIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when tin disulfide is used as the negative electrode material of lithium-ion batteries, the cycle stability is poor. The main reason is that the lithium intercalation volume expands rapidly and the structure decomposes, resulting in the inability of lithium ions to intercalate or deintercalate in subsequent reactions.

Method used

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  • Lithium ion battery cathode material and preparation method thereof
  • Lithium ion battery cathode material and preparation method thereof
  • Lithium ion battery cathode material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] 0.5mmol (72mg) MoO 3 Put into 60ml of absolute ethanol, ultrasonically shake for 10 minutes, then stir it magnetically, then add 0.5mmol (0.1755g) SnCl 4 ·5H 2 O and 2mmol (0.15g) CH 3 CSNH 2 , magnetically stirred for 20 minutes, then heated in a water bath at 80°C and kept magnetically stirred for 1 hour, washed several times by centrifugation with absolute ethanol and deionized water, and vacuum-dried at 50°C. Then it was calcined at 250° C. for 3 hours under an argon atmosphere to obtain molybdenum trioxide / tin disulfide core-shell nanowires.

Embodiment 2

[0036] 0.5mmol (72mg) MoO 3 Put into 60ml of absolute ethanol, ultrasonically shake for 10 minutes, then stir it magnetically, then add 1.5mmol (0.5265g) SnCl 4 ·5H 2 O and 6mmol (0.45g) CH 3 CSNH 2, magnetically stirred for 20 minutes, then heated in a water bath at 80°C and kept magnetically stirred for 2 hours, washed by centrifugation with absolute ethanol and deionized water for several times, and vacuum-dried at 50°C. Then it was calcined at 250° C. for 3 hours under an argon atmosphere to obtain molybdenum trioxide / tin disulfide core-shell nanowires.

Embodiment 3

[0038] 0.5mmol (72mg) MoO 3 Put in 60ml of absolute ethanol, ultrasonically shake for 10 minutes, then magnetically stir it, then add 2.5mmol (0.8775g) SnCl 4 ·5H 2 O and 10mmol (0.75g) CH 3 CSNH 2 , magnetically stirred for 20 minutes, then heated in a water bath at 80°C and kept magnetically stirred for 4 hours, washed by centrifugation with absolute ethanol and deionized water for several times, and dried in vacuum at 50°C. Then it was calcined at 250° C. for 3 hours under an argon atmosphere to obtain molybdenum trioxide / tin disulfide core-shell nanowires.

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Abstract

The invention discloses a lithium ion battery cathode material and a preparation method thereof, and the material involved is a molybdenum trioxide / tin disulfide core-shell structure nanowire. The material adopts a two-step synthetic method: using ammonium molybdate tetrahydrate as a molybdenum source, and synthesizing molybdenum trioxide through a hydrothermal method; then, dispersing molybdenumtrioxide with ethanol, and adding tin tetrachloride pentahydrate and thioacetamide therein; putting the mixture in water bath and heating, and keeping magnetic stirring; after that, using absolute ethyl alcohol and deionized water to centrifugally wash the product, vacuum drying the product, sintering the sample under the atmosphere of argon; and obtaining the cathode material. The molybdenum trioxide / tin disulfide core-shell structure nanowire prepared by the method has the characteristics of good crystallinity, high sample uniformity, simple process and the like and can be applied to the lithium ion battery cathode material on a large scale. The lithium ion battery test results show that the cathode material can maintain a reversible capacity of 478 mAh / g after 100 cycles, which is higher than the theoretical capacity of graphite (372 mAh / g).

Description

technical field [0001] The invention relates to a negative electrode material of a lithium ion battery and a preparation method thereof. The negative electrode material is a molybdenum trioxide / tin disulfide core-shell structure nanowire. The specific content relates to the negative electrode material and a preparation method thereof, belonging to electrochemistry and material synthesis technology field. Background technique [0002] Lithium-ion batteries have become the main energy storage devices for electric vehicles and portable electronic devices due to their high capacity, environmental friendliness and long life. The performance of lithium-ion batteries is greatly influenced by their electrode materials. At present, the anode materials of commercialized lithium-ion batteries are mainly graphite materials, which benefit from the layered structure of graphite, which is conducive to the intercalation and deintercalation of lithium ions during charging and discharging; o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/485H01M4/58H01M10/0525B82Y30/00
CPCB82Y30/00H01M4/366H01M4/485H01M4/5815H01M10/0525Y02E60/10
Inventor 沈子红舒海波胡陈力黄杰梁培赵天锋袁洪涛果馨
Owner CHINA JILIANG UNIV