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Hard carbon-metal lithium nitride composite cathode materials and method for preparing same

A negative electrode material, lithium metal technology, applied in the direction of alkali metal compounds, mixing methods, lithium compounds, etc., can solve the problems of high temperature, limited stability, highly sensitive electrolyte, etc., to achieve high density, large application value, irreversible capacity small effect

Inactive Publication Date: 2006-12-13
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The main problems of graphite negative electrode materials are: (1) Artificial graphite needs to be prepared by high-temperature graphitization at 1900°C to 2800°C, and the temperature is too high; (2) The theoretical specific capacity is 372mAh / g, which is relatively low; (3) Fragile structure leads to very limited stability and is also highly sensitive to electrolyte
However, since lithium metal nitride itself is a lithium-rich material, the negative electrode cannot be directly combined with the usual high-potential positive electrode such as LiCoO 2 and LiMn 2 o 4 Paired to form a lithium-ion battery

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Embodiment 1: Weigh 2g of metal Co powder and put it into a tube furnace, under 20% H 2 / N 2Heating at 600°C for 16h under atmosphere to remove oxides on the surface, and then gradually cooling to room temperature. 1 g of Li in a glove box filled with argon 3 N powder and pretreated 0.78g metal Co powder were mixed evenly, pre-pressed at 3MPa, high-purity N 2 Heating at 850°C for 15 hours under the protection of atmosphere (99.999%), and then gradually cooling to room temperature, Li 2.6 co 0.4 N. It was pulverized in an argon-filled glove box. The measured Li 2.6 co 0.4 N sample at a current density of 0.2mA / cm 2 When the charge specific capacity of the first cycle is 100mAh / g, the discharge specific capacity is 900mAh / g; and a hard carbon sample is measured at a current density of 0.2mA / cm 2 When the charge specific capacity of the first cycle is 500mAh / g, the discharge specific capacity is 300mAh / g, so Li 2.6 co 0.4 The discharge specific capacity of exces...

Embodiment 2

[0029] Embodiment two: take by weighing 1g metal Cu powder and insert in the tube furnace, under 20%H 2 / N 2 Heating at 600°C for 16h under atmosphere to remove oxides on the surface, and then gradually cooling to room temperature. 1 g of Li in a glove box filled with argon 3 N powder and pretreated 0.84g metallic Cu powder were mixed evenly, pre-pressed at 3MPa, high-purity N 2 Heating at 800°C for 12 hours under the protection of atmosphere (99.999%), and then gradually cooling to room temperature, Li 2.6 Cu 0.4 N. It was pulverized in an argon-filled glove box. The measured Li 2.6 Cu 0.4 N sample at a current density of 0.2mA / cm 2 When the charge specific capacity of the first cycle is 200mAh / g, the discharge specific capacity is 700mAh / g; and a hard carbon sample is measured at a current density of 0.2mA / cm 2 The charge specific capacity of the first cycle is 750mAh / g, and the discharge specific capacity is 500mAh / g. Therefore it is possible to use Li 2.6 Cu 0....

Embodiment 3

[0030] Embodiment three: in the glove box that is full of nitrogen, 1g Li 3 N powder and 1g of pretreated metal Ni powder were placed in a 100ml stainless steel ball milling container with stainless steel balls built in. After sealing, the ball milling speed was adjusted to 500r / min on the mill, with 90min intervals of 20min intervals and 10h milling time. Available Li 2.5 Ni 0.5 N powder. The measured Li 2.5 Ni 0.5 N sample at a current density of 0.2mA / cm 2 The charge specific capacity of the first cycle is 200mAh / g, and the discharge specific capacity is 600mAh / g; and a hard carbon sample is measured at a current density of 0.2mA / cm 2 The charge specific capacity of the 1st cycle is 800mAh / g, and the discharge specific capacity is 400mAh / g. Therefore it is possible to use Li 2.5 Ni 0.5 The discharge specific capacity of excess N is 400mAh / g to compensate the first irreversible specific capacity of hard carbon 400mAh / g, and the ratio is 1:1. Weigh the Li according t...

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Abstract

The invention discloses a hard carbon-Li metal nitride compound cathode material and making method in the chemical engineering and new source material technological domain, which is characterized by the following: preparing Li-metal nitride based on Li3 powder and metal powder of removing surface oxide; blending hard carbon and Li-metal nitride protected by inert gas atmosphere completely to produce hard carbon-Li metal nitride composite cathode material. The first surplus discharging capacitance can supplement the first irreversible capacitance of hard carbon. The invention possesses little irreversible capacitance, which improves coulomb efficiency and electric chemical activity.

Description

technical field [0001] The hard carbon-lithium metal nitride composite negative electrode material and its preparation method belong to the technical field of chemical engineering and new materials, and in particular relate to the technical field of preparation of lithium ion battery negative electrode materials. Background technique [0002] Lithium-ion battery is a new type of high-energy secondary battery that began to be put into practical use in the 1990s. It has outstanding advantages such as high voltage, high energy density, good cycle performance, small self-discharge, and no memory effect. It has been widely used in mobile phones and notebooks. Computers, digital products, electric tools and other portable equipment fields. As the power source of electric vehicles and hybrid vehicles, lithium-ion batteries have shown good application prospects and great application potential in many fields such as military equipment and aerospace. [0003] Since the advent of lith...

Claims

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Application Information

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IPC IPC(8): H01M4/58H01M4/04C01D15/00B01F3/18H01M4/38
CPCY02E60/10
Inventor 孙颢何向明姜长印万春荣李建军王莉任建国
Owner TSINGHUA UNIV
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