Nitrogen-doped soft carbon-coated silicon-based lithium ion negative electrode material as well as preparation method and application thereof

A technology of negative electrode materials and doped materials, applied in negative electrodes, battery electrodes, active material electrodes, etc., can solve problems affecting material consistency, poor particle dispersion, and affecting material cycle performance, etc., to achieve excellent consistency, high The effect of cycle stability

Active Publication Date: 2021-12-17
LIYANG TIANMU PILOT BATTERY MATERIAL TECH CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since the solid particles are mixed in the liquid phase, the mass transfer contact is still carried out in the solid phase mode after drying, so there are still uneven reactions and poor particle dispersion, which will affect the consistency of the materials obtained by the preparation method, and May thus affect the cycle performance of the material

Method used

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  • Nitrogen-doped soft carbon-coated silicon-based lithium ion negative electrode material as well as preparation method and application thereof
  • Nitrogen-doped soft carbon-coated silicon-based lithium ion negative electrode material as well as preparation method and application thereof
  • Nitrogen-doped soft carbon-coated silicon-based lithium ion negative electrode material as well as preparation method and application thereof

Examples

Experimental program
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preparation example Construction

[0029] The preparation method of nitrogen-doped soft carbon coated silicon-based lithium ion negative electrode material of the present invention, its steps are as follows figure 1 shown, including:

[0030] Step 110, using a nitrogen-containing gas source or a high-boiling point nitrogen-containing compound as a doping material, performing a gas-phase mixing reaction between the vapor of the doping material and the pre-heated silicon source vapor at 1200°C-1700°C for 1-24 hours to obtain a nitrogen-doped Hybrid silicon oxide material;

[0031] Wherein, the vapor of the doping material is obtained by heating the doping material to 25°C-800°C.

[0032] In the dopant material, the nitrogen-containing gas source is a nitrogen-containing compound that is gaseous at normal temperature, and may specifically include one or more of nitrogen, ammonia, nitrous oxide or dimethylamine; the high-boiling nitrogen-containing compound is The following is a liquid or solid nitrogen-containin...

Embodiment 1

[0045] Put 1.4kg of silicon powder and 3kg of silicon dioxide in a high-temperature reaction furnace and heat it to turn it into steam. At the same time, slowly feed 1.6L (converted mass: 2g) of nitrogen gas under the protection of argon, react at 1400°C for 3 hours, and cool to room temperature. After the material is crushed, it is detected by a time-of-flight secondary ion mass spectrometer (TOF-SIMS). figure 2 The time-of-flight secondary ion mass spectrum of the nitrogen-doped silicon-based lithium-ion battery anode material provided in Example 1 of the present invention will be used later for comparison with the comparative example.

[0046]Put 2kg of the material that passed the test into a rotary furnace, raise the temperature to 1000°C under a protective argon atmosphere, and pass in argon and an organic mixed gas equal to that of argon at a volume ratio of 1:1 for chemical vapor deposition. The gas is a mixed gas of propylene and methane with a volume ratio of 1:1. ...

Embodiment 2

[0050] Put 4.2kg of silicon powder and 9kg of silicon dioxide in a high-temperature reaction furnace and heat it to turn it into steam. At the same time, 23.4L (converted mass is 18g) of ammonia gas is slowly introduced under the protection of argon, and the reaction is carried out at 1200°C for 8 hours. Cool to room temperature. After the material is broken, it is qualified by TOF-SIMS. Put 2kg of the material that passed the test into a rotary furnace, raise the temperature to 850°C under a protective argon atmosphere, and pass in argon and an organic mixed gas equivalent to argon at a volume ratio of 1:1 for chemical vapor deposition. The gas is a mixed gas of propylene and methane with a volume ratio of 2:3. After keeping the temperature for 3 hours and turning off the organic gas source to cool down, a uniform nitrogen-doped soft carbon-coated silicon-based lithium-ion battery negative electrode material is obtained. The nitrogen content in the obtained negative electrode...

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Abstract

The invention relates to a nitrogen-doped soft carbon coated silicon-based lithium ion negative electrode material as well as a preparation method and application thereof. The method comprises the following steps: by taking a nitrogen-containing gas source or a high-boiling-point nitrogen-containing compound as a doping material, carrying out gas-phase mixing reaction on vapor of the doping material and preheated silicon source vapor at 1200-1700 DEG C for 1-24 hours to obtain a nitrogen-doped silicon monoxide material, wherein the silicon source steam is mixed steam of silicon steam and silicon dioxide steam, the nitrogen-containing gas source is a nitrogen-containing compound which is gaseous at normal temperature, and the high-boiling-point nitrogen-containing compound is a nitrogen-containing compound which is liquid or solid at normal temperature; cooling the nitrogen-doped silicon monoxide material to room temperature, discharging, crushing and screening; carrying out a flight time secondary ion mass spectrometry analysis test on the crushed and screened material, and determining whether the doping uniformity of the nitrogen doped in the silicon monoxide meets a preset condition or not; and performing carbon coating on the material of which the doping uniformity meets a preset condition to obtain the nitrogen-doped silicon-based lithium ion battery negative electrode material.

Description

technical field [0001] The invention relates to the technical field of material preparation, in particular to a nitrogen-doped soft carbon-coated silicon-based lithium ion negative electrode material and a preparation method and application thereof. Background technique [0002] With the rapid development of new energy vehicles, the industry has put forward higher requirements for the performance of power batteries. The positive and negative electrode materials determine the energy density, power density, cycle life, high and low temperature performance, and the key components of safety performance of the power battery. Among them, the requirements for lithium-ion battery anode materials must at least meet the following points: 1. Low chemical potential; 2. Good conductivity; 3. Good cycle stability and safety; 4. Inexpensive raw materials, etc. . [0003] Anode materials are one of the most critical materials in lithium-ion battery technology. The current commercially av...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/38H01M4/62H01M10/0525
CPCH01M4/386H01M4/625H01M10/0525H01M2004/027Y02E60/10
Inventor 潘明军刘柏男罗飞
Owner LIYANG TIANMU PILOT BATTERY MATERIAL TECH CO LTD
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