Preparation method of lithium ion battery composite negative electrode material

A technology for lithium-ion batteries and negative electrode materials, applied in battery electrodes, negative electrodes, secondary batteries, etc., can solve problems affecting electrode conductivity and cycle performance, electrode structure damage, and low Coulombic efficiency, etc., to improve battery rate performance and high cycle performance, electronic conductivity and ion mobility

Inactive Publication Date: 2018-02-16
SHENZHEN ANDING NEW ENERGY TECH DEV CO LTD
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  • Application Information

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Problems solved by technology

However, the use of silicon as the negative electrode material of lithium-ion batteries has the following disadvantages: the volume change of silicon reaches three times the original during the process of lithium ion intercalation, the huge change in volume destroys the electrode structure, and the electrode material falls off on the copper foil. Affects the conductivity and cycleability of the electrode; silicon is a semiconductor, and its conductivity is much worse than that of graphite, resulting in a large degree of irreversibility in the lithium ion deintercalation process and a low initial Coulombic efficiency

Method used

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  • Preparation method of lithium ion battery composite negative electrode material
  • Preparation method of lithium ion battery composite negative electrode material
  • Preparation method of lithium ion battery composite negative electrode material

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preparation example Construction

[0024] The invention provides a preparation method of a lithium-ion battery composite negative electrode material, comprising the following steps:

[0025] Step 1: Take a certain amount of fatty acid and dissolve it in absolute ethanol, take a certain amount of p-toluenesulfonamide and dissolve it in absolute ethanol, mix the two evenly, add a catalyst or condensing agent to react and then purify to obtain p-toluenesulfonate Amide-modified fatty acid solution;

[0026] Step 2: Add concentrated sulfuric acid dropwise to the p-toluenesulfonamide-modified fatty acid solution prepared in Step 1, and stir; then add template agent mesoporous silicon, stir for a period of time, and dry the mixture in an oven at 85-100°C After 1-2 hours to obtain solid powder, put the solid powder in a tube furnace, under the protection of nitrogen, calcinate at 200-300°C for 6-8 hours, then cool and take it out to prepare nitrogen / sulfur-doped mesoporous carbon material;

[0027] Step 3: The nitroge...

Embodiment 1

[0035] (1) Dissolve 8.0-9.0g oleic acid in absolute ethanol, dissolve 0.6-0.7g p-toluenesulfonamide in absolute ethanol, mix the two evenly in a round bottom flask, add catalyst or condensing agent to react After purification, the oleic acid solution modified by p-toluenesulfonamide is obtained;

[0036] (2) Add 0.5-0.8 g of concentrated sulfuric acid dropwise to the p-toluenesulfonamide-modified oleic acid solution prepared in (1), stir for 10-15 min, then add template agent mesoporous silicon, stir for a period of time, and place the mixed solution in Dry in an oven at 85-95°C for 1.0-1.5h to obtain solid powder, place the solid powder in a tube furnace, under the protection of nitrogen, calcinate at 200-260°C for 6.0-7.0h, cool and take it out to obtain nitrogen / sulfur Doped mesoporous carbon materials;

[0037] (3) The nitrogen / sulfur-doped mesoporous carbon material prepared in step 2 was heat-treated at 1000-1100°C for 4.0-4.5 hours under the protection of nitrogen gas,...

Embodiment 2

[0042] (1) Dissolve 8.0-9.5g palmitic acid in absolute ethanol, dissolve 0.6-0.8g p-toluenesulfonamide in absolute ethanol, mix the two evenly in a round bottom flask, add catalyst or condensing agent to react After purification, the palmitic acid solution modified by p-toluenesulfonamide is obtained;

[0043] (2) Add 0.5-0.7 g of concentrated sulfuric acid dropwise to the palmitic acid solution modified by p-toluenesulfonamide prepared in (1), stir for 10-15 min, then add template agent mesoporous silicon, stir for a period of time, and place the mixed solution in Dry in an oven at 85-95°C for 1.0-1.5h to obtain a solid powder, put the solid powder in a tube furnace, under the protection of nitrogen, calcinate at a high temperature of 200-300°C for 6-7 hours, then cool and take it out to obtain a nitrogen / sulfur doped Miscellaneous mesoporous carbon materials;

[0044] (3) The nitrogen / sulfur-doped mesoporous carbon material prepared in step 2 is heat-treated at 1000-1200°C ...

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Abstract

The invention provides a preparation method of a lithium ion battery composite negative electrode material. A nitrogen / sulfur-doped graphitized ordered mesoporous carbon material is prepared by takingpara toluene sulfonamide modified fatty acid as a carbon source, doping a nitrogen element and a sulfur element and performing high-temperature carbonization, annealing and strong alkali processing,the nitrogen / sulfur-doped graphitized ordered mesoporous carbon material is ordered and uniform in aperture, and lithium ion mobility and transmission in the material is facilitated; after nitrogen / sulfur doping, lone pair electrons on nitrogen atoms are used for improving the electron density and the electron conductivity of a battery material; by doping the sulfur element, the interface propertyof the carbon material is changed, and the compatibility and the wettability of the material and an electrolyte are improved; and after nanometer silicon powder is coated by the nitrogen / sulfur-dopedmesoporous graphite material, silicon is prevented from being in direct contact with the electrolyte, moreover, the huge volume expansion of the silicon during the charge-discharge process is effectively reduced, the structural stability of the material is maintained, an SEI membrane is prevented from being continuously generated, and the initial discharging efficiency is improved.

Description

【Technical field】 [0001] The invention relates to the technical field of lithium ion batteries, in particular to a preparation method of a lithium ion battery composite negative electrode material. 【Background technique】 [0002] The wide application of portable electronic devices and the rapid development of hybrid electric vehicles and pure electric vehicles have put forward higher requirements on the specific energy and cycle life of lithium-ion batteries. Anode materials are one of the key factors to evaluate the comprehensive performance of lithium-ion batteries. At present, graphite anode is the most widely used in commercial lithium-ion batteries. Graphite negative electrode has the advantages of high safety, stable working voltage and long cycle life. However, the theoretical specific capacity of graphite negative electrode is only 372mAh / g. There is not much room for improving the specific capacity by optimizing the battery preparation process, which cannot meet th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/62H01M10/0525
CPCH01M4/366H01M4/386H01M4/625H01M10/0525H01M2004/021H01M2004/027H01M4/362H01M4/587Y02E60/10H01M4/1393H01M4/622
Inventor 焦奇方杨泛明
Owner SHENZHEN ANDING NEW ENERGY TECH DEV CO LTD
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