Nanometer lignin carbon-zinc oxidecomposite material as well as preparation method and application thereof

A nano-lignin and composite material technology is applied to nano-lignin zinc oxide carbon composite material and its preparation, and the application field of lithium ion battery negative electrode material, which can solve the problem of low load, pulverization and capacity attenuation, and poor rate performance. and other problems, to achieve the effect of speeding up insertion and extraction, inhibiting volume expansion, and improving energy density
CN112072085AActive Publication Date: 2020-12-11SOUTH CHINA UNIV OF TECH +1
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
SOUTH CHINA UNIV OF TECH
Publication Date
2020-12-11

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Abstract

The invention discloses a nanometer lignin carbon-zinc oxidecomposite material as well as a preparation method and application thereof. The method comprises the following steps: (1) dissolving ligninin an alkaline solution, carrying out hydrothermal pretreatment, conducting cooling, and adjusting a pH value to 3-5 to obtain an acid-soluble lignin solution; (2) adding a mixed solution of soluble zinc salt and soluble carbonate into the acid-soluble lignin solution, conducting a hydrothermal reaction, then adding aldehydes, and continuing the hydrothermal reaction to obtain a ploycondensed lignin / zinc oxide compound; and (3) carbonizing the polycondensed lignin / zinc oxide compound to obtain the nanometer lignin carbon-zinc oxidecomposite material. In the obtained nanometer lignin carbon-zinc oxidecomposite material, lignin carbon uniformly coats the surfaces of zinc oxide particles to form a uniform carbon layer with a continuous structure, so the problems of serious volume expansion and poor conductivity of zinc oxide serving as a lithium ion negative electrode material are solved, and the specific capacity, the initial coulombic efficiency and the rate capability of a lithium ionbattery are improved.
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Description

technical field

[0001] The invention belongs to the technical field of negative electrode materials for lithium ion batteries, and in particular relates to a nanometer lignin carbon oxide zinc composite material, a preparation method thereof and an application in lithium ion battery negative electrode materials. Background technique

[0002] Graphite, as a traditional lithium-ion battery (LIB) anode material, has a low theoretical specific capacity (372mAh g -1 ), the low ion diffusion coefficient caused by too narrow layer spacing, and the easy formation of lithium dendrites during high-rate charge and discharge, causing safety hazards and other issues. This forces us to develop a new lithium battery anode material with high energy density, high rate performance and high safety.

[0003] In recent years, transition metal oxides have been extensively studied as anode materials for lithium batteries. Zinc oxide (ZnO) has a high theoretical lithium storage capacity (978mAh g...

Claims

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