Lithium ion battery hard carbon negative electrode material and preparation method thereof

A lithium-ion battery and negative electrode material technology, applied in the direction of battery electrodes, negative electrodes, secondary batteries, etc., can solve the problems of poor cycle stability, voltage hysteresis, and low initial efficiency of hard carbon negative electrodes, and improve electrochemical performance. Avoid voltage hysteresis and improve energy density

Active Publication Date: 2021-09-24
QINGHAI KAIJIN NEW ENERGY MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The present invention aims to solve the problems of poor cycle stability, obvious voltage hysteresis, and low initial efficiency of existing hard carbon negative electrode materials, and provides a brand-new hard carbon negative electrode material for lithium-ion batteries and its preparation method

Method used

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  • Lithium ion battery hard carbon negative electrode material and preparation method thereof
  • Lithium ion battery hard carbon negative electrode material and preparation method thereof
  • Lithium ion battery hard carbon negative electrode material and preparation method thereof

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preparation example Construction

[0021] The preparation method of lithium ion battery hard carbon negative electrode material of the present invention is: make TiO 2 Ultrasonic dispersion with lithium salt mixture and metal lithium powder in solvent 1 to obtain dispersion 1; dissolve allyl phenolic resin in solvent 2 to obtain solution 2; slowly add dispersion 1 to solution 2 and stir evenly After heating and solidifying, a mixture is obtained; and the mixture is carbonized at a high temperature under the protection of an inert atmosphere to obtain a hard carbon negative electrode material for a lithium ion battery. In order to avoid the reaction between the metal lithium powder and the solvent, solvent one and solvent two in this application are all weakly polar organic solvents or non-polar organic solvents, including n-heptane, n-hexane, cyclohexane, carbon disulfide, tetrachloride One or more of carbon, xylene, toluene, benzene, ether, ethyl acetate, n-pentane, n-butanol, dioxane, acetone, and isopropanol...

Embodiment 1

[0026] Take 15g of lithium metal powder and ultrasonically disperse it in carbon disulfide to obtain dispersion solution 1; then take 85g of allyl phenolic resin and dissolve it in carbon disulfide to obtain solution 2. The input amount of carbon disulfide is advisable to fully disperse metal lithium powder and dissolve allyl phenolic resin. While stirring, pour the dispersion into Solution 2 to make it fully mixed. Then put the mixture into a mold, heat up to 195°C at a rate of 8°C / min, and keep warm for 2 hours; then heat up to 245°C at a speed of 3°C / min, and keep warm for 4 hours. The solidified mixture was transferred to a high-temperature carbonization furnace, fed with nitrogen for protection, then raised to 1000°C at a rate of 30°C / min, kept for 3 hours, and then naturally cooled to below 80°C under the condition of continuously feeding nitrogen, Open the oven to cool down naturally. That is, a hard carbon negative electrode material for a lithium ion battery is obta...

Embodiment 2

[0029]Melt a certain amount of lithium acetate into absolute ethanol, then calculate the amount of tetrabutyl titanate according to the Ti 0.72g, Ti:Li molar ratio of 1:0.83, add it to the previously prepared solution, stir well and turn it into a constant temperature Solvothermally react at 180°C for 24 hours in a drying oven; then centrifuge and wash the bottom sediment until the pH is neutral, and directly disperse metal lithium powder into carbon disulfide without drying to obtain dispersion 1. All the other steps are the same as in Example 1. Use the ground powder to assemble a button battery. The first charge and discharge specific capacity measured at 1C rate is 756.4mAh / g. After 100 cycles, the specific capacity is still as high as 580.9mAh / g. image 3 shown. Compared with Example 1, adding a small amount of lithium titanate can significantly improve the electrochemical performance of the hard carbon material synthesized by metal lithium and allyl phenolic resin, whic...

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Abstract

The invention discloses a lithium ion battery hard carbon negative electrode material and a preparation method thereof. The preparation method comprises the following steps: ultrasonically dispersing a TiO2 and lithium salt mixture and metal lithium powder in a solvent I to prepare dispersion liquid I; dissolving allyl phenolic resin in a solvent II to prepare a solution II; slowly adding the dispersion liquid I into the solution II, uniformly stirring, heating and curing to obtain a mixture; and performing high-temperature carbonization on the mixture under the protection of an inert atmosphere to obtain the lithium ion battery hard carbon negative electrode material. The lithium ion battery hard carbon negative electrode material prepared by the method provided by the invention has high initial charge-discharge specific capacity, a stable charge-discharge platform and good overall cycle stability, and the preparation method is simple and convenient and controllable to operate.

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 hard carbon negative electrode material for lithium ion batteries and a preparation method thereof. Background technique [0002] As an important energy storage device, lithium-ion batteries are widely used in new energy vehicles and portable electronic products. As an important part of lithium-ion batteries, anode materials have been reported in a variety of researches, mainly including carbon materials and non-carbon materials. Carbon materials include graphitized carbon materials (natural graphite and modified graphite) and amorphous carbon materials (hard carbon and soft carbon), and non-carbon materials include silicon-based materials, tin-based materials, transition metal oxides, metal nitrides and others Alloy anode materials. [0003] At present, graphitized carbon materials are commonly used commercially, but...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/587H01M4/62H01M10/0525
CPCH01M4/587H01M10/0525H01M4/628H01M2004/027H01M2004/021Y02E60/10
Inventor 仰韻霖吴武
Owner QINGHAI KAIJIN NEW ENERGY MATERIALS CO LTD
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