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Lithium ion battery based on TiO2/MoS2 negative electrode material and preparation method of lithium ion battery

A technology of lithium-ion batteries and negative electrode materials, which is applied in the manufacture of electrolyte batteries, negative electrodes, battery electrodes, etc., can solve the problems of low theoretical lithium storage capacity, poor double charge performance, and difficulty in meeting the needs of use, so as to improve cycle performance, Good double charging performance and the effect of meeting the performance requirements

Pending Publication Date: 2021-02-23
TIANNENG SAFT ENERGY JOINT CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, graphite, which has been widely used as a negative electrode material for lithium-ion batteries, is becoming more and more difficult to satisfy people's expectations for this product because of its relatively low theoretical lithium storage capacity (372mAh / g) and poor double charge performance. usage requirements

Method used

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  • Lithium ion battery based on TiO2/MoS2 negative electrode material and preparation method of lithium ion battery
  • Lithium ion battery based on TiO2/MoS2 negative electrode material and preparation method of lithium ion battery
  • Lithium ion battery based on TiO2/MoS2 negative electrode material and preparation method of lithium ion battery

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Embodiment 1

[0039] A layered stacked TiO 2 / MoS 2 The preparation method of core-shell structure composite material comprises the following steps:

[0040] S1. Dissolve titanium tetrafluoride in benzyl alcohol to prepare a solution of 2.5g / L;

[0041] S2. Pour the solution obtained in step S1 into a hydrothermal kettle, heat up to 180°C, and keep for 12h;

[0042] S3. After centrifuging and washing the product obtained in step S2, drying at 60° C. to obtain TiO 2 And annealed at 500℃ for 2h;

[0043] S4. The TiO 2 Hydrothermal reaction with oxalic acid, thioacetamide and sodium molybdate at 200℃ for 20h;

[0044] S5. The product obtained in step S4 is washed with water and ethanol, and then dried in the air at a temperature of 60 ° C to obtain TiO 2 / MoS 2 Core-shell structure composites.

Embodiment 2

[0046] A kind of TiO based on embodiment 1 2 / MoS 2 The preparation method of the lithium ion battery of the negative electrode material comprises the following steps:

[0047]S1. Preparation of positive electrode sheet: Stir lithium iron phosphate, conductive carbon black, graphene, carbon nanotubes and polyvinylidene fluoride in N-methylpyrrolidone in a mass ratio of 95:2:2:1:2, and pump Vacuum defoaming, adjust viscosity, sieve with a 150-mesh sieve, apply the sieved slurry evenly to the front and back sides of 12μm aluminum foil, and then roll it (compact density 2.67g / cc), mold Cut and place in the oven to bake;

[0048] Among them, the cathode material preparation process is as follows:

[0049] (1) stirring the polyvinylidene fluoride in N-methylpyrrolidone for 2.5h until the polyvinylidene fluoride is completely dissolved;

[0050] (2) adding conductive carbon black and vacuuming and stirring for 35min, then adding graphene and carbon nanotubes, vacuuming and stirr...

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Abstract

The invention belongs to the technical field of lithium ion batteries, and particularly relates to a preparation method of a lithium ion battery based on a TiO2 / MoS2 negative electrode material. The method comprises the following steps of S1, preparing a positive plate; S2, preparing a negative plate, namely uniformly stirring the laminated TiO2 / MoS2 core-shell structure composite material, a conductive agent III, a thickening agent and a negative electrode binder in a dispersing agent II, vacuumizing, defoaming, sieving, uniformly coating the positive surface and the negative surface of a copper foil with the mixture, rolling, die-cutting, and baking in an oven; and S3, assembling the positive plate, the negative plate and a diaphragm into a battery cell in a winding or laminating manner,then injecting an electrolyte, sealing, forming, and grading capacity to obtain the lithium ion battery based on the TiO2 / MoS2 negative electrode material. Compared with a traditional graphite negative electrode, the battery negative electrode prepared from the laminated TiO2 / MoS2 core-shell structure composite material has the advantage that the cycle performance of the lithium ion battery can be effectively improved.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to a TiO-based 2 / MoS 2 Lithium-ion battery of negative electrode material and preparation method thereof. Background technique [0002] As a widely used secondary battery on the market, lithium-ion batteries are being valued by governments around the world because of their non-toxicity, long life, and good weather resistance. The lithium-ion battery market is bound to have a more sustainable development. [0003] However, graphite, which has been widely used as a negative electrode material for lithium-ion batteries, is becoming more and more difficult to meet people's needs for this product because of its relatively low theoretical lithium storage capacity (372mAh / g) and poor double charge performance. usage requirements. In order to promote a broader development future for lithium-ion batteries, we 2 Nanosheets with nano-microspheres of TiO by a sim...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/058H01M4/36H01M4/58H01M10/0525
CPCH01M10/058H01M4/366H01M4/5815H01M10/0525H01M2004/021H01M2004/027Y02E60/10Y02P70/50
Inventor 许伟秦作路周翠芳李明钧周建中张萍毛鸥
Owner TIANNENG SAFT ENERGY JOINT CO