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Lithium nitride/ceramic base composite material with high activity lithiation/delithiation performance

A composite material and lithium nitride technology are applied in the field of reversible lithium deintercalation composite active material and its preparation, lithium nitride/ceramic matrix composite negative electrode material and its preparation field, to achieve good electrochemical cycle performance and rate performance, lithium storage The effect of high capacity and wide charge-discharge voltage window

Inactive Publication Date: 2009-06-17
DALIAN MARITIME UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Currently for Li transition metal nitrides Li x m y The research on N is still mainly limited to the use of transition metal M to replace Li 3 Part of the Li in N forms a ternary reversible deintercalation lithium material with an inverse fluorite structure or a layered structure with P6 symmetry, such as Li 7 MnN 4 , Li 3 FeN 2 , Li 3-x co x N. Li 3-x Ni x N. Li 3-x Cu x N etc.

Method used

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  • Lithium nitride/ceramic base composite material with high activity lithiation/delithiation performance

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] In a glove box filled with Ar gas, weigh an appropriate amount of Li at a molar ratio of 5:3 3 N and Si powder (<100 nanometers), mixed evenly, and placed in a stainless steel ball mill tank, sealed, and the tank was filled with Ar gas at this time. At room temperature, the ball mill was ball milled at a speed of 500 rpm for 5 hours to obtain the desired product.

[0017] The product after the reaction is made into an electrode sheet according to the pole piece preparation process, and the pole piece preparation method is as follows: take a certain amount of powdery ball mill product, add 20wt% acetylene black as a conductive agent, 10wt% PTFE (polytetrafluoroethylene) Ethylene) powder is used as a binder, and after being fully mixed, it is coated and pressed on a nickel foam substrate with a diameter of φ12mm as an electrode sheet for electrochemical testing. The prepared pole piece and metal Li are used as the counter electrode to make a button battery, and the elect...

Embodiment 2

[0019] In a glove box filled with Ar gas, weigh Li at a molar ratio of 1:3 3 N and nano-silicon nitride powder were mixed evenly, placed in a stainless steel ball mill jar in a glove box filled with argon, and sealed. At room temperature, the ball mill was milled at a frequency of 450 rpm for 10 hours to obtain the desired product. For the reacted product, the cut-off charge and discharge voltage of the electrochemical test process is 0-3V, and the others are the same as in Embodiment 1. The prepared composite negative electrode material has lithium intercalation activity, the first reversible capacity reaches more than 500mAh / g, and the first charge and discharge efficiency is more than 80%.

Embodiment 3

[0021] In a glove box filled with Ar gas, weigh an appropriate amount of Li at a molar ratio of 3:1 3 N and SiO 2 Powder, mixed evenly, and placed in a stainless steel ball mill jar, sealed, at this time the ball mill jar was full of Ar gas. At room temperature, the ball mill was milled at a frequency of 600 rpm for 5 hours. The desired product is obtained. The reaction product, the electrochemical test process is the same as in Example 1. The prepared composite anode material has a reversible capacity of more than 600mAh / g for the first time.

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Abstract

The invention belongs to the field of lithium ion batteries and super-capacitors, and in particular relates to a lithium nitride / ceramic-based composite anode material and a preparation method thereof, wherein the lithium nitride / ceramic-based composite anode material is prepared by a mechanochemical method and has high specific capacity, electrochemical lithium intercalation-detercalation reversibility and steady cycle performance. The composite material is a composite material which takes lithium nitride as an activity reinforced body and ceramic powder containing silicon element as a matrix; in the composite material, the chemical bonding is taken as a main interfacial bonding mode between the reinforced body and the matrix, the reinforced body and the matrix have good structural stability, and the mol ratio of the reinforcement body to the matrix is 1: 1-9: 1. The material has better electrochemical cycle performance and rate performance; and the material has a wider voltage window, has good ionic conductivity and cyclicity, and has potential application value in novel super-capacitor electrode materials. The preparation method is simple and easy to control, and the needed raw materials do not contain heavy metal elements and have the advantages of environmental protection and low cost.

Description

technical field [0001] The invention belongs to the field of lithium ion batteries and supercapacitors. The invention relates to a reversible deintercalation lithium composite active material which can be used as a lithium ion battery and a preparation method thereof. In particular, it relates to a lithium nitride / ceramic matrix composite negative electrode material with high specific capacity, reversible electrochemical lithium intercalation and stable cycle performance prepared by a mechanochemical method and a preparation method thereof. technical background [0002] Lithium-ion batteries have become a backup power source for mobile terminal electronic equipment due to their advantages such as high power, high cycle life, and environmental friendliness. High-capacity lithium-ion battery electrode materials have always been the focus and hotspot of research, lithium transition metal nitride Li x m y N (M is a metal element) is an important branch of high-capacity lithiu...

Claims

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Application Information

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IPC IPC(8): C04B35/78
Inventor 文钟晟李嵩孙俊才季世军
Owner DALIAN MARITIME UNIVERSITY
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