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Negative pole material for lithium ionic cell and preparation process thereof

A technology for lithium-ion batteries and negative electrode materials, applied in electrode manufacturing, battery electrodes, circuits, etc., can solve the problem of low charge and discharge performance of negative electrode materials

Inactive Publication Date: 2009-07-08
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the binding force between graphene nanosheets and tin dioxide is much weaker than that of the supported negative electrode material, resulting in poor charge and discharge performance of the negative electrode material.

Method used

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  • Negative pole material for lithium ionic cell and preparation process thereof
  • Negative pole material for lithium ionic cell and preparation process thereof
  • Negative pole material for lithium ionic cell and preparation process thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] 5 grams of flake graphite with a particle size of 30 microns, 4 grams of sodium nitrate and 25 grams of potassium permanganate were added to 600 grams of concentrated sulfuric acid with a mass fraction of 98%, stirred for 120 hours, filtered and washed, and placed in an aqueous solution to Ultrasonic at 200W power for 6 hours, add 10 grams of stannous chloride dihydrate and 1 gram of hydrazine hydrate, continue to stir for 24 hours, filter, wash, and dry to obtain a lithium ion battery negative electrode material.

[0026] figure 1 It is the X-ray diffraction pattern of the lithium-ion battery negative electrode material that example 1 obtains, that is, graphene nanosheets supported tin dioxide. Depend on figure 1 It can be seen from the diffraction peaks that the negative electrode material mainly contains tin dioxide.

[0027] figure 2 It is the atomic force micrograph of the lithium ion battery negative electrode material prepared by example 1. Depend on figur...

Embodiment 2

[0032] 5 grams of flake graphite with a particle size of 30 microns, 4 grams of sodium nitrate and 25 grams of potassium permanganate were added to 600 grams of concentrated sulfuric acid with a mass fraction of 98%, stirred for 120 hours, filtered and washed, and then placed in an aqueous solution. Ultrasonic at 200W for 6 hours, add 5 grams of stannous nitrate dihydrate and 1 gram of sodium borohydride, continue to stir for 24 hours, filter, wash, and dry to obtain a lithium-ion battery negative electrode material. The thickness of the graphene nanosheets in the obtained graphene nanosheets loaded tin dioxide is 1-30 nanometers, and the particle diameter of tin dioxide is 1-4 nanometers. -1 The reversible specific capacity of the current charge and discharge test is 520mAh·g -1 .

Embodiment 3

[0034] 5 grams of flake graphite with a particle size of 30 microns, 4 grams of sodium nitrate and 25 grams of potassium permanganate were added to 600 grams of concentrated sulfuric acid with a mass fraction of 98%, stirred for 120 hours, filtered and washed, and then placed in an aqueous solution. Ultrasonic at 200W power for 6 hours, add 1 gram of stannous sulfate and 1 gram of ascorbic acid, continue to stir for 24 hours, filter, wash and dry to obtain a lithium ion battery negative electrode material. The thickness of the graphene nanosheets in the obtained graphene nanosheets loaded tin dioxide is 1-30 nanometers, and the particle diameter of tin dioxide is 1-3 nanometers. -1 The reversible specific capacity of the current charge and discharge test is 480mAh·g -1 .

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Abstract

The invention discloses a negative electrode material of a Li-ion battery and a preparation method thereof. The negative electrode material is a load-type negative electrode material, i.e. tin dioxide loaded with grapheme nanometer sheet. The negative electrode material has the advantages of higher electron and ion conductivity, large reaction area, large free expansion space, adaptability to various environments with large charge / discharge rate, and can endow the battery with high cycle performance, high specific capacity and quick charge / discharge capability; and the reversible specific capacity of the battery can be kept at a value larger than 600 mAh.g during charge / discharge with a current of 300 mAh.g. The preparation method of the negative electrode material is simple and feasible and suits industrial production.

Description

technical field [0001] The invention relates to a battery electrode material and a preparation method thereof, in particular to a lithium ion battery negative electrode material and a preparation method thereof. Background technique [0002] Tin dioxide is a potential negative electrode material for lithium-ion batteries, with a theoretical capacity of 781mAhg -1 . However, the material will undergo a serious volume change during the process of lithium intercalation and deintercalation, resulting in a very low service life of the battery. Therefore, it is very important to manufacture composite materials containing tin dioxide to suppress its volume change. [0003] CN1885596 discloses a new type of tin-based composite oxide lithium-ion battery negative electrode material, but the carrier SiO2 and the like are insulators, so the conductivity of the negative electrode material is very low, which has a great impact on performance. [0004] CN1812167 discloses a preparation ...

Claims

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Application Information

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IPC IPC(8): H01M4/48H01M4/60H01M4/04
CPCY02E60/12Y02E60/10
Inventor 马紫峰杨晓伟何雨石
Owner SHANGHAI JIAO TONG UNIV
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