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Preparation method for novel negative electrode material of lithium ion battery

A technology for lithium-ion batteries and negative electrode materials, applied in battery electrodes, nanotechnology for materials and surface science, secondary batteries, etc., can solve the problem of material capacity decline, nano-particles that are easy to agglomerate and grow, easy to break and pulverize, etc. problem, to achieve the effect of maintaining stability, alleviating huge volume changes, and controlling size

Inactive Publication Date: 2016-07-06
SHANXI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

So the SnO obtained by the reaction 2 When nanoparticles are combined with carbon, nanoparticles are easy to agglomerate and grow up, while large particles of SnO 2 It is easy to crack and pulverize, so that the capacity of the material drops rapidly when it is cycled

Method used

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  • Preparation method for novel negative electrode material of lithium ion battery
  • Preparation method for novel negative electrode material of lithium ion battery

Examples

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Embodiment 1

[0023] A preparation method of a novel lithium-ion battery negative electrode material, taking 0.05g of SnCl 4 ·5H 2 O was dissolved in 10ml of acetone-water mixed system, in which the volume ratio of acetone and water was 1:10, and stirred until SnCl 4 ·5H 2 After the O is completely dissolved, add 0.3g of urea and 0.6g of polyvinylpyrrolidone (PVP), stir for 2 hours, add 0.03g of expanded graphite, then transfer the solution into a 100ml hydrothermal reaction kettle, and place it at 110°C for 4 hours of hydrothermal synthesis , after the reaction kettle was naturally cooled to room temperature, the obtained product was suction filtered, washed, dried, and calcined in an inert gas atmosphere at 600°C for 3h to obtain nano-SnO 2 / C Composite. The sample was observed by transmission electron microscopy and found that SnO 2 The size of nanoparticles is less than 10nm, and they are uniformly dispersed on the graphite carrier, such as figure 1 shown. The sample has been test...

Embodiment 2

[0025] A preparation method of a novel lithium-ion battery negative electrode material, taking 0.3g of SnCl 2 2H 2 O was dissolved in 50ml of acetone-water mixed system, wherein the volume ratio of acetone and water ranged from 10:3, stirred until SnCl 2 2H 2 After O is completely dissolved, add 1.5g of urea and 1.4g of polyvinylpyrrolidone (PVP), stir for 5 hours, add 0.1g of expanded graphite, then transfer the solution into a 100ml hydrothermal reaction kettle, and place it at 130°C for 2 hours of hydrothermal synthesis , after the reaction kettle was naturally cooled to room temperature, the obtained product was suction filtered, washed, dried, and calcined in an inert gas atmosphere at 600°C for 3h to obtain nano-SnO 2 / C Composite. The sample has been tested for charge and discharge performance, and the capacity after 100 cycles is 879mAh / g.

Embodiment 3

[0027] A preparation method of a novel lithium-ion battery negative electrode material, taking 0.5g of SnCl 4 ·5H 2 O is dissolved in 80ml of acetone-water mixed system, wherein the volume ratio of acetone and water is in the range of 10:1, and stirred until SnCl 4 ·5H 2 After O is completely dissolved, add 3.5g of urea and 2.5g of polyvinylpyrrolidone (PVP), stir for 5 hours, add 0.2g of expanded graphite, then transfer the solution into a 100ml hydrothermal reaction kettle, and place it at 90°C for 8 hours of hydrothermal synthesis , after the reaction kettle was naturally cooled to room temperature, the obtained product was suction filtered, washed, dried, and calcined in an inert gas atmosphere at 600°C for 3h to obtain nano-SnO 2 / C Composite. The sample has been tested for charge and discharge performance, and the capacity is 665mAh / g after 100 cycles.

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Abstract

The invention relates to a preparation method for a novel negative electrode material of a lithium ion battery, belongs to the technical field of a lithium ion battery material, and aims to provide a preparation method for a novel nanometer SnO<2> / C composite negative electrode material of the lithium ion battery. The preparation method for the novel negative electrode material of the lithium ion battery comprises the steps of dissolving a tin source into a mixed acetone water system, stirring until the tin source is fully dissolved, then adding urea and polyvinylpyrrolidone, stirring for 2-5h, then adding expanded graphite, next, moving the solution to a hydrothermal reaction kettle, and performing hydrothermal synthesis at a temperature of 90-130 DEG C for 2-10h, naturally cooling the reaction kettle to the room temperature, and performing suction filtration, washing and drying on the obtained product, and baking under an inert atmosphere at a temperature of 600 DEG C for 3h to obtain the nanometer SnO<2> / C composite negative electrode material of the lithium ion battery.

Description

technical field [0001] The invention relates to a preparation method of a novel lithium-ion battery negative electrode material, belonging to the technical field of lithium-ion battery materials. Background technique [0002] Compared with traditional secondary batteries (lead-acid, nickel-hydrogen, nickel-chromium), lithium-ion batteries are characterized by their high voltage, high energy density (volume specific energy and mass specific energy), low self-discharge rate, wide operating temperature range, long cycle Long life, environmental protection, no memory effect, and high current charging and discharging, etc., have been widely used in mobile communication equipment, portable electronic equipment, electric vehicles and other fields, and have become one of the important green energy in modern and future. Among them, the negative electrode material is one of the key factors that determine the overall performance of lithium-ion batteries. At present, commercial graphit...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/48H01M4/62H01M10/0525B82Y30/00B82Y40/00
CPCB82Y30/00B82Y40/00H01M4/364H01M4/48H01M4/625H01M4/628H01M10/0525Y02E60/10
Inventor 李勇赵云马灿良赵永祥
Owner SHANXI UNIV
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