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Method for preparing nano-carbon coated lithium battery anode material

A negative electrode material, lithium battery technology, applied in the direction of battery electrodes, circuits, electrical components, etc., can solve the problems of complex preparation process, limited mitigation effect, advanced preparation method, etc., and achieve the effects of enhanced stability, convenient transmission, and good conductivity

Active Publication Date: 2013-01-09
QINGDAO HAIYUAN IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although these attempts have improved the cycle stability of Sn-based anode materials to varying degrees, the high cost and difficulty in mass production determined by its complex preparation methods limit its industrial application.
[0004] Found through the retrieval to prior art document, " Advanced Materials " (" advanced material "), in 2009, 21 phases, "Designed Synthesis of Coaxial SnO" reported on page 2536 2 carbon Hollow Nanospheres for Highly Reversible Lithium Storage" ("the design and assembly of carbon-coated tin dioxide nano-hollow spheres for high-reversible lithium batteries): this method can prepare tin dioxide nano-hollow spheres coated with carbon layers, from a certain To a certain extent, the volume change of the tin dioxide material during the charging and discharging process is alleviated, but because its structure size is still large (above 300nm), its structure has a limited effect on alleviating the volume change of the electrode material, and more importantly, the silica ball The process of being a template makes the preparation process very complicated and difficult to industrialize

Method used

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  • Method for preparing nano-carbon coated lithium battery anode material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Take 1 portion of discarded crop chaff, wash it with deionized water and dry it at 90°C, put it into a vacuum sintering furnace at 5°C / min and raise the temperature to 650°C for 1 hour to carbonize; then use 0.2M ferric chloride solution Mix it with the sample evenly, place it in a vacuum sintering furnace and heat it to 800°C, keep it warm for 2 hours for graphitization treatment, stir the obtained sample with dilute hydrochloric acid, and then rinse the above sample with water repeatedly. A highly graphitized mesoporous activated carbon matrix was obtained.

[0025] The sample in step 1 was treated with 98% concentrated sulfuric acid under reflux for 3 hours, rinsed with water and then dried; the above sample was added to tin chloride aqueous solution for ultrasonic treatment for 5 hours, rinsed and dried to obtain tin dioxide particles / activated carbon with uniform particle distribution composite material.

[0026] Take 1 part of the above sample and 0.5M polyethyle...

Embodiment 2

[0028] Take 1 part of discarded crop straw, wash it with deionized water and dry it at 100°C, put it into a vacuum sintering furnace at 8°C / min and raise the temperature to 600°C for 2h to carbonize; then use 0.5M cobalt nitrate solution and sample Mix evenly, heat to 750°C in a vacuum sintering furnace, keep warm for 3 hours for graphitization treatment, stir the obtained sample with dilute hydrochloric acid, and then rinse the above sample with water repeatedly. A highly graphitized mesoporous activated carbon matrix was obtained.

[0029] Reflux the sample in step 1 with concentrated nitric acid for 3 hours, rinse it with water and dry it; add the above sample into an aqueous solution of tin chloride for ultrasonic treatment for 4 hours, rinse and dry it to obtain a tin dioxide particle / activated carbon composite material with uniform particle distribution .

[0030] Mix 1 part of the above sample with 0.8M starch solution by ultrasonic treatment; then transfer the suspens...

Embodiment 3

[0032] Take 1 waste coconut shell, wash it with deionized water and dry it at 95°C, put it into a vacuum sintering furnace at 10°C / min and raise the temperature to 600°C for 1h to carbonize; then use 0.4M nickel sulfate solution and sample Mix evenly, place in a vacuum sintering furnace and heat to 900°C, keep warm for 1 hour for graphitization treatment, stir the obtained sample with dilute hydrochloric acid, and then rinse the above sample with water repeatedly. A highly graphitized mesoporous activated carbon matrix was obtained.

[0033] Reflux the sample in step 1 with 98% concentrated sulfuric acid for 3 hours, rinse it with water and dry it; add the above sample into tin chloride aqueous solution for ultrasonic treatment for 5 hours, rinse and dry it to obtain tin dioxide particles / activated carbon with uniform particle distribution composite material.

[0034] Take 1 portion of the above sample and 1.2M polyisoprene solution and mix them uniformly by ultrasonic treatm...

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Abstract

The invention discloses a method for preparing a nano-carbon coated lithium battery anode material. An active carbon material which is highly graphitized and has a porous structure is prepared from waste crops, and serves as a substrate; uniformly dispersed nano tin dioxide particles are loaded on the substrate subjected to simple treatment, natural or synthetic polymer is used as a carbon source, and a carbon layer coats the nano tin dioxide particles so as to fulfill the aim of combining the regulation function of nano dispersion of the nano particles on volume expansion of the tin dioxide with the restraint and buffer function of the coated carbon layer on the tin dioxide particles; therefore, higher battery capacity and cycle stability can be achieved.

Description

technical field [0001] The present invention relates to a method for preparing negative electrode materials in the technical field of lithium batteries, in particular to a method for preparing lithium battery negative electrode materials coated with nano-carbon with high cycle stability. Background technique [0002] Graphite materials are widely used in the field of lithium-ion battery anode materials because of their good stability, considerable capacity, and easy availability. But its theoretical capacity is only 372mAh / g, such a limited capacity can no longer meet people's increasingly urgent demand for high energy density electrode materials. As a battery negative electrode material, tin dioxide has a theoretical capacity of 790mAh / g, which is more than twice that of graphite negative electrode material, which has attracted widespread attention. However, during the charging and discharging reaction process of the battery, due to the expansion (300%) of the reversible r...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/1393
CPCY02E60/12Y02E60/122Y02E60/10
Inventor 朱申敏李尧张荻刘庆雷李京波
Owner QINGDAO HAIYUAN IND
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