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Silicon oxide/carbon lithium ion battery negative electrode material with hollow structure, preparation method and application thereof

A lithium-ion battery and silicon oxide technology, which is applied in the direction of battery electrodes, active material electrodes, carbon preparation/purification, etc., can solve the problems of high SiOx equipment requirements, cumbersome preparation methods, poor cycle stability, etc., and achieve low price, The effect of good repeatability and high ball forming rate

Active Publication Date: 2021-02-02
HARBIN INST OF TECH +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to solve the problems that the existing method for suppressing the volume effect of SiO has high requirements for equipment, harsh conditions, complicated preparation methods and poor cycle stability, and provides a silicon oxide / carbon lithium-ion battery with a hollow structure Negative electrode material, preparation method and application

Method used

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  • Silicon oxide/carbon lithium ion battery negative electrode material with hollow structure, preparation method and application thereof
  • Silicon oxide/carbon lithium ion battery negative electrode material with hollow structure, preparation method and application thereof
  • Silicon oxide/carbon lithium ion battery negative electrode material with hollow structure, preparation method and application thereof

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specific Embodiment approach 1

[0031] Specific implementation mode 1: This implementation mode is a silicon oxide / carbon lithium ion battery negative electrode material with a hollow structure. The thickness is 50nm-250nm; in the spherical structure or bowl-shaped structure, C is evenly distributed in the SiOx clusters at the nanoscale, wherein the SiOx clusters are smaller than 5nm.

specific Embodiment approach 2

[0032] Specific Embodiment 2: This embodiment differs from Specific Embodiment 1 in that: the value range of x in SiOx is 0

specific Embodiment approach 3

[0033] Specific embodiment three: This embodiment is a method for preparing a silicon oxide / carbon lithium ion battery negative electrode material with a hollow structure, which is completed according to the following steps:

[0034] 1. Disperse the aldehyde in deionized water to obtain an aldehyde solution; drop the silicon source into the aldehyde solution, then stir and react to obtain a flocculent solution;

[0035] 2. Filter the flocculent solution obtained in step 1, discard the filtrate, and obtain a solid substance; use distilled water and absolute ethanol to alternately wash the solid substance, and then freeze-dry to obtain monodisperse hollow concave spheres;

[0036] 3. Place the monodisperse hollow concave spheres in a tube furnace, then pass an inert gas into the tube furnace, and calcine at a high temperature under the protection of the inert gas to obtain a SiOx / C lithium ion battery negative electrode material with a hollow structure.

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Abstract

The invention discloses a silicon oxide / carbon lithium ion battery negative electrode material with a hollow structure, a preparation method and an application thereof, and relates to a lithium ion battery negative electrode material, a preparation method and an application thereof. The invention aims to solve problems that an existing method for inhibiting a volume effect of SiOx has high requirements on equipment and harsh conditions, and the preparation method is tedious and poor in cycling stability. The interior of the silicon oxide / carbon lithium ion battery negative electrode material with the hollow structure is the hollow structure, a surface is a concave spherical structure or a bowl-shaped structure, and the size is 200-1200 nm. The method comprises the following steps: 1, dropwise adding a silicon source into an aldehyde solution, and stirring for reaction; 2, filtering, cleaning and freeze-drying; and 3, calcining monodisperse hollow concave spheres at a high temperature under the protection of an inert gas. The silicon oxide / carbon lithium ion battery negative electrode material with the hollow structure is used as a lithium ion battery negative electrode material. The method is simple to operate, low in cost and high in balling rate.

Description

technical field [0001] The invention relates to a lithium ion battery negative electrode material, a preparation method and an application. Background technique [0002] As a new generation of clean, environmentally friendly, and renewable secondary energy, lithium-ion batteries have been promoted to the practical agenda in the field of power vehicles due to their high energy density, high operating voltage, long cycle life, and low self-discharge. However, at present, lithium-ion batteries cannot meet the requirements of large-scale application of power batteries in terms of energy density, power density, safety performance, cycle life, and production cost. One of the main reasons is that they are limited by the electrode materials of lithium-ion batteries. At present, the anode materials used in commercial lithium-ion batteries are mainly graphite-based carbon materials, but they have the disadvantages of low specific capacity (372mAh / g), rapid charge and discharge, easy t...

Claims

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Application Information

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IPC IPC(8): H01M4/48H01M4/62H01M10/0525C01B32/05C01B33/113B82Y30/00
CPCH01M4/483H01M4/628H01M4/625H01M10/0525C01B33/113C01B32/05B82Y30/00C01P2004/01C01P2004/03C01P2004/04C01P2006/40C01P2004/62C01P2004/61C01P2004/32C01P2004/30H01M2004/021H01M2004/027Y02E60/10
Inventor 杜春雨周晓明刘杨任阳尹鸽平丰震河
Owner HARBIN INST OF TECH
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