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Hollow negative electrode material and preparation method thereof and lithium ion battery containing hollow negative electrode material

A negative electrode material, hollow technology, applied in the field of hollow negative electrode materials, its preparation method and lithium-ion batteries containing it, can solve the problems of poor coating uniformity of the silicon carbon core-shell structure, easy peeling off of the coating layer, etc., and achieve an increase in magnification and cycle performance, reducing material structure damage, and accelerating ion transport

Pending Publication Date: 2021-03-16
YINLONG ENERGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The main purpose of the present invention is to provide a hollow negative electrode material, its preparation method and lithium ion battery containing it, so as to solve the problem of poor coating uniformity of the silicon carbon core-shell structure in the existing negative electrode material, and the coated The problem of easy peeling of layers

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  • Hollow negative electrode material and preparation method thereof and lithium ion battery containing hollow negative electrode material
  • Hollow negative electrode material and preparation method thereof and lithium ion battery containing hollow negative electrode material
  • Hollow negative electrode material and preparation method thereof and lithium ion battery containing hollow negative electrode material

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preparation example Construction

[0023] As described in the background technology, the existing negative electrode materials have the problem of poor coating uniformity of the silicon-carbon core-shell structure, and the coating layer is easy to fall off during repeated charging and discharging. In order to solve the above technical problems, the present application provides a method for preparing a hollow negative electrode material. The preparation method for the hollow negative electrode material includes: under an inert atmosphere, the template agent and the first carbon source are subjected to the first coating process to obtain carbon-coated template; make the carbon-coated template and polar solvent and tetraethyl orthosilicate carry out the second coating process to obtain a silica / carbon / template composite material; under an inert atmosphere, the Reducing the silicon dioxide / carbon / template composite material with a second carbon source to obtain a silicon / carbon / template composite material; removing ...

Embodiment 1

[0048] A carbon / silicon / carbon negative electrode material and a preparation method thereof, comprising:

[0049] Step 1: Add 50mg TiO to 45mL, 10mol / L sodium hydroxide aqueous solution 2 powder (P25 powder), stir until the P25 powder is evenly dispersed to obtain the mixed solution B;

[0050] Step 2: Transfer the mixed solution B to a polytetrafluoroethylene reactor, seal it and transfer it to an oven, and keep it warm at 180°C for 12 hours to obtain a suspension C;

[0051] Step 3: Filter the suspension C, wash it several times with deionized water, and then soak it in 0.1mol / L dilute hydrochloric acid until the supernatant becomes acidic. Filter, wash with deionized water until neutral, and dry at 70°C for 24 hours to obtain white powder D;

[0052] Step 4: Calcining the white powder D at 550°C for 2 hours in an air atmosphere to obtain the white powder E, which is TiO 2 Nanowire (diameter about 120nm, length about 10μm);

[0053] Step 5: Weigh 40mgTiO 2 nanowires, mi...

Embodiment 2

[0064] A carbon / silicon / carbon negative electrode material and a preparation method thereof, comprising:

[0065] Step 1: Add 50mg TiO to 45mL, 10mol / L sodium hydroxide aqueous solution 2 powder (P25 powder), stir until the P25 powder is evenly dispersed to obtain the mixed solution B;

[0066] Step 2: Transfer the mixed solution B to a polytetrafluoroethylene reactor, seal it and transfer it to an oven, and keep it warm at 200°C for 8 hours to obtain a suspension C;

[0067] Step 3: Filter the suspension C, wash it several times with deionized water, and then soak it in 0.15mol / L dilute hydrochloric acid until the supernatant becomes acidic. Filter, wash with deionized water until neutral, and dry at a certain temperature of 55°C for 22 hours to obtain white powder D;

[0068] Step 4: Calcining the white powder D at 500°C in an air atmosphere for 4 hours to obtain the white powder E, which is TiO 2 Nanowire (diameter about 150nm, length about 20μm);

[0069] Step 5: Weigh...

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Abstract

The invention provides a hollow negative electrode material and a preparation method thereof and a lithium ion battery containing the hollow negative electrode material. The preparation method of thehollow negative electrode material comprises the following steps: in an inert atmosphere, carrying out a first coating process on a template agent and a first carbon source to obtain a carbon-coated template agent; carrying out a second coating process on the carbon-coated template agent, a polar solvent and tetraethyl orthosilicate to obtain a silicon dioxide / carbon / template agent composite material; in an inert atmosphere, carrying out reduction reaction on the silicon dioxide / carbon / template agent composite material and a second carbon source to obtain a silicon / carbon / template agent composite material; removing the template agent in the silicon / carbon / template agent composite material to obtain a silicon / carbon nanotube; and coating the silicon / carbon nanotube and a third carbon sourcefor the third time in an inert atmosphere to obtain the carbon / silicon / carbon nanotube, namely the hollow negative electrode material. The hollow negative electrode material prepared by the preparation method is beneficial to greatly improving the cycle performance of the lithium ion battery.

Description

technical field [0001] The invention relates to the field of lithium ion battery manufacturing, in particular to a hollow negative electrode material, a preparation method thereof and a lithium ion battery containing the same. Background technique [0002] Silicon has a high theoretical specific capacity (4200mAh / g), has obvious performance advantages over graphite, and is expected to replace graphite as the choice of anode material for high energy density lithium-ion batteries. However, the volume of silicon changes as much as 300% during charge and discharge, the solid electrolyte membrane (SEI film) is easily broken, the electrolyte is consumed, and the battery capacity decays rapidly, making the cycle life of silicon unsatisfactory. [0003] The previous graphite or / and carbon-coated silicon structure can effectively alleviate the volume expansion of silicon during charging and discharging. However, due to the limited deformation space of the coating layer, the coating l...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/62H01M10/0525B82Y40/00B82Y30/00
CPCB82Y30/00B82Y40/00H01M4/366H01M4/386H01M4/62H01M4/625H01M4/628H01M10/0525Y02E60/10
Inventor 姚曼洪伟峰赵微张正李海军蔡惠群
Owner YINLONG ENERGY CO LTD
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