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Lithium ionic cell cathode material of graphite-like structure and preparing process thereof

A lithium-ion battery and graphite structure technology, applied in battery electrodes, structural parts, chemical instruments and methods, etc., can solve the problems of cumbersome steps, high cost, and difficulty in industrialization, and achieve simple preparation methods and prevent dendrites The effect of generating and solving security problems

Active Publication Date: 2008-10-15
BTR NEW MATERIAL GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Compounds of B-C-N are mostly synthesized by chemical vapor deposition (J.AM.CHEM.SOC.2005, 127, 16354-16355), physical vapor deposition [App1.Sur.Sci.1998, (127-129): 692-696 ], the method of high-energy ball milling [Diamond & Related Materials 16 (2007) 1450-1454], these methods are cumbersome in steps, high in cost, and difficult to realize industrialization

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  • Lithium ionic cell cathode material of graphite-like structure and preparing process thereof
  • Lithium ionic cell cathode material of graphite-like structure and preparing process thereof
  • Lithium ionic cell cathode material of graphite-like structure and preparing process thereof

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preparation example Construction

[0023] The preparation method of the lithium-ion battery negative electrode material of graphite-like structure of the present invention comprises the following steps:

[0024] 1. Weigh the nitrogen-containing compound and boric acid respectively according to the amount ratio of substances 6-1:1-6, and the nitrogen-containing compound is any one of pyrrole, amine, oxazine, pyridine, urea and amino acid nitrogen-containing compound A mixture of two or more substances, respectively dissolve 1-6mol of nitrogen-containing compound in water at 25-100°C, dissolve 6-1mol of boric acid in water at 25-100°C, and then slowly inject boric acid into the dissolved nitrogen-containing compound solution , stirred for 0.1-10 h, cooled naturally to room temperature to obtain needle-shaped precursors, and detected with a scanning electron microscope, using a KYKY-2800B scanning electron microscope from Beijing Zhongke Keyi Technology Development Co., Ltd.

[0025] 2. Put the needle-shaped precu...

Embodiment 1

[0030] Example 1, according to the nitrogen-containing compound melamine: the boric acid substance ratio is 1: 3 and weighs 1 mol and 3 mol of the two compounds, respectively, the nitrogen-containing compound is dissolved in 250 ml of water at 30 ° C, and the boric acid is dissolved in 125 ml of 50 ° C water, and then slowly inject the boric acid solution into the dissolved nitrogen-containing compound solution, continue to stir for 0.5h, and naturally cool to room temperature to prepare the needle-like precursor, such as figure 1 As shown, the particles are fibrous, 20-200 μm long and 1-20 μm wide. Such as figure 2 As shown, the precursor is composed of compounds containing B, C, and N elements. The above-mentioned needle-shaped precursor and lithium hydroxide are mixed uniformly by ball milling with a ratio of 1 mol and 2 mol according to the amount of substances, and the temperature is raised to 800°C at a heating rate of 5°C / min and kept for 50h, and naturally cooled to ...

Embodiment 2

[0032] In Example 2, 3 mol and 1 mol of the two compounds were weighed according to the nitrogen-containing compound melamine: boric acid substance ratio of 3:1. The nitrogen-containing compound was dissolved in 1000ml at 95°C, and the boric acid was dissolved in 500ml at 80°C, and then the boric acid solution was slowly injected into the dissolved nitrogen-containing compound solution, stirred continuously for 10h, and naturally cooled to room temperature to prepare the needle-shaped precursor. The above-mentioned precursor and lithium hydroxide were mixed evenly by ball milling in a ratio of 1:6, 1mol and 6mol, and the temperature was raised to 1200°C at a heating rate of 10°C / min for 5 hours, and naturally cooled to room temperature. min; then place the obtained material in a heating device, heat it up to 2500°C at a heating rate of 5°C / min and keep it warm for 180 hours, and then carry out graphitization treatment. , to obtain a material with a fibrous crystal structure, w...

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Abstract

The invention discloses a material similar to graphite structure for the cathode of a lithium ion battery and a preparation method thereof and aims to solve the technical problem of improving the safety of the lithium ion battery. The material similar to graphite structure for the cathode of the lithium ion battery is a BCN compound with a fiber crystal structure. The distance between the layers of the crystal is between 0.300 to 0.400nm; the granularity is 1 to 75 Mum; the voltage of the lithium when embedded into the material is 0.2 to 0.8V; and the voltage of the lithium when pulled out of the material is 0.2 to 1.0V. The preparation method comprises the following steps: an acicular precursor is prepared by using a nitrogenous compound and boric acid; the acicular precursor is sintered to obtain the fiber crystal structure. Compared with prior art, the BCN material similar to graphite structure has a higher discharge tension platform than regular carbon materials, prevents dendritic crystal when used as the material for the cathode of the lithium ion battery, and solves the safety problem with the lithium ion battery. Furthermore, the preparation method is simple and able to realize large-scale industrial production.

Description

technical field [0001] The invention relates to a battery negative electrode material and a preparation method thereof, in particular to a lithium ion battery negative electrode material and a preparation method thereof. Background technique [0002] As anode materials for lithium-ion batteries, carbon-based materials have the advantages of high discharge capacity, long cycle life, and low cost. Therefore, the anode materials widely used in lithium-ion batteries are basically carbon materials, such as artificial graphite, natural graphite, mesocarbon microspheres (MCMB), petroleum coke, pyrolytic resin carbon, etc., but carbon-based materials also exist For example, poor compatibility with PC electrolyte, poor high-rate discharge performance, and potential safety hazards at high temperatures, researchers often use coating technology to improve the poor compatibility of materials and electrolytes, and improve the lithium ion and solvent. Co-embedding problems, such as: coati...

Claims

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Application Information

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IPC IPC(8): C01B21/082C01B35/14H01M4/58H01M4/587
CPCY02E60/10
Inventor 岳敏程林贺雪琴张万红
Owner BTR NEW MATERIAL GRP CO LTD
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