Preparation and application of lithium ion battery electrode material

A lithium-ion battery and electrode material technology, applied in battery electrodes, negative electrodes, secondary batteries, etc., can solve problems affecting lithium storage research, only reversible capacity, etc., and achieve the effect of simple preparation methods

Pending Publication Date: 2020-07-17
SHANGHAI UNIVERSITY OF ELECTRIC POWER
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Regarding the research on lithium batteries of niobium diselenide, Hitz first tried to apply niobium selenide to lithium batteries, but only had a reversible capacity of 372mAh / g
And, NbSe 2 The preparation process of NbSe lasted 84h, and the limitation of the length of the synthesis method also affected the NbSe 2 research on lithium storage

Method used

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  • Preparation and application of lithium ion battery electrode material
  • Preparation and application of lithium ion battery electrode material
  • Preparation and application of lithium ion battery electrode material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] 2.527g of selenium powder and 1.472g of niobium powder were mixed evenly by hand grinding in a mortar for 1 hour, and then packed in a vacuum quartz tube. After the quartz plug was sealed, the furnace plug was used for secondary sealing protection. Then, the tube furnace was pre-passed with nitrogen for half an hour, and after exhausting the air, the tube furnace was sealed. Then, in a tube furnace, the temperature was raised to 750°C at a rate of 5°C / min and kept at a constant temperature for 3 hours, and then naturally cooled to room temperature to obtain the product niobium diselenide material, which consists of a hexagonal material with a plane size of 1-5 μm and a thickness of 100 nm-1 μm. Lamellar composition, product purity 100%, product yield 93%

[0041] figure 1 It is the XRD pattern of the niobium diselenide material, and Fig. 2 is the SEM image of the prepared niobium diselenide material. As can be seen from the figure, the peak position of the XRD spectru...

Embodiment 2

[0043] 0.93g of niobium powder and 1.975g of selenium powder were mixed uniformly by wet ball milling, and after drying, they were packed in a vacuum quartz tube and vacuum-sealed using a vacuum sealing machine. Put it into a tube furnace and raise the temperature to 600°C at a rate of 10°C / min and keep it at a constant temperature for 3 hours, then cool it down to room temperature naturally to obtain the product niobium diselenide material. The purity of the product is 76%, with some impurity phase NbSe 3 , The product yield was 92%.

Embodiment 3

[0045] Mix 1.1g of niobium powder and 2.2g of selenium powder evenly by magnetic force, and after drying, put it in a vacuum quartz tube, seal it with a quartz plug, and then use a furnace plug for secondary sealing protection. Then, pre-pass the tube furnace with argon for half an hour, and then seal the tube furnace after exhausting the air. Raise the temperature of the tube furnace to 800°C at a rate of 15°C / min and keep it at a constant temperature for 10 hours, then naturally cool to room temperature to obtain the product niobium diselenide material. The product purity is 100%, and the product yield is 93%. happened in the process.

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Abstract

The invention discloses preparation and application of a lithium ion battery electrode material. The preparation method of electrode material niobium diselenide for the lithium ion battery comprises the following steps: uniformly mixing a selenium source and a niobium source; and sintering under a non-oxidizing atmosphere or a vacuum condition to obtain niobium diselenide. Wherein the selenium source comprises metal selenium, the niobium source comprises metal niobium, and the molar ratio of the niobium source to the selenium source is 1: 2-3. The invention explores the synthesis conditions ofthe NbSe2 electrode material which is more excellent, simple, diverse and economical, does not need to waste the non-oxidizing atmosphere and has the lithium storage performance. The crystal structure of the synthesized NbSe2 is a layered structure of a hexagonal crystal system, belongs to a P63/mmc space group, and shows excellent cycle performance and rate capability when being applied to a lithium ion battery.

Description

technical field [0001] The invention belongs to the technical field of battery electrode materials, and in particular relates to the preparation and application of a lithium-ion battery electrode material. Background technique [0002] With the rapid consumption of fossil fuels and the large-scale development of low-cost, clean, and stable electrical energy, electrochemical energy storage has become increasingly important. Compared with other energy storage methods, electrochemical energy storage technology has the characteristics of high efficiency, low investment, safe use, and flexible application, which is most in line with the development direction of today's energy. Lithium-ion batteries, as a typical electrochemical energy storage device, are widely used due to their high power density, no memory effect, and long cycle life. [0003] In the short term, lithium-ion batteries will remain the most widely used portable secondary batteries. The continuous expansion of th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B19/00H01M4/58H01M10/0525
CPCC01B19/007H01M4/581H01M10/0525H01M2004/027Y02E60/10
Inventor 王保峰吴茜凯汪浩立吴宝柱庄强强
Owner SHANGHAI UNIVERSITY OF ELECTRIC POWER
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