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Graphene oxide/polyaniline lithium ion battery anode material and preparation method thereof

A positive electrode material, polyaniline lithium technology, applied in battery electrodes, graphite, secondary batteries, etc., can solve the problems of polyaniline electrode materials such as poor cycle stability, poor adhesion, and large dispersion of polyaniline structures. Increased cycle stability, improved cycle performance, and improved specific capacity

Inactive Publication Date: 2014-02-26
TIANJIN POLYTECHNIC UNIV
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  • Application Information

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Problems solved by technology

[0004] Further studies have shown that polyaniline is prone to volume shrinkage and expansion during the charge-discharge cycle, which makes the cycle stability of polyaniline electrode materials worse.
At the same time, polyaniline has large dispersion and poor adhesion, which limit its application.

Method used

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  • Graphene oxide/polyaniline lithium ion battery anode material and preparation method thereof
  • Graphene oxide/polyaniline lithium ion battery anode material and preparation method thereof
  • Graphene oxide/polyaniline lithium ion battery anode material and preparation method thereof

Examples

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Embodiment 1

[0030] Step 1. Preparation of graphite oxide: put the natural flake graphite into 5% hydrochloric acid, heat and reflux for 24 hours, wash fully with water, and dry at 110° C. for 24 hours. Repeat once and save for later use. In an ice bath, mix 3g of graphite powder with 1.5g of NaNO 3 Add it to 69mL of concentrated sulfuric acid at 0°C, then slowly add 9g of potassium permanganate, then transfer it to an oil bath at 35°C and keep it for 2 hours, then slowly add 138mL of deionized water, and the temperature rises to 98°C to continue the reaction for 40min. Then add deionized water containing hydrogen peroxide until the color of the solution turns bright yellow, then suction filter while it is hot, then wash with 10% hydrochloric acid, suction filter, and vacuum dry at 60°C to obtain graphite oxide.

[0031] Step 2: Prepare a 1 mol / L graphite oxide solution, ultrasonically treat it for 1 hour, and control the temperature below 4°C to obtain a graphene oxide solution. At room...

Embodiment 2

[0035] The hydrochloric acid of 1mol / L among the embodiment one is converted into the oxalic acid of equivalent 1mol / L, other conditions remain unchanged.

Embodiment 3

[0037] The graphene oxide solution in Example 1 was changed from 93mL to 372mL, that is, the ratio of graphene oxide to aniline was changed from 1:100 to 1:25, and other conditions remained unchanged.

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Abstract

The invention discloses a preparation method of a graphene oxide / polyaniline composite material. The composite material is used as an anode material to be applied to a lithium ion battery. The composite material comprises 1 to 50 percent of graphene oxide and 50 to 99 percent of polyaniline, the graphene oxide dispersion solution is prepared in an ultrasonic way, and the graphene oxide / polyaniline composite material is obtained through an in-situ polymerization method. The polyaniline is uniformly distributed on a graphene oxide lamella. The prepared graphene oxide / polyaniline composite material has the characteristics of high electric conductivity and high specific area. When the graphene oxide / polyaniline composite material is used as the lithium ion battery anode material, the specific capacity is high, and the circulation stability is good. The preparation method is simple in process, low in cost and promising in application prospect.

Description

technical field [0001] The invention relates to a graphene oxide / polyaniline lithium ion battery cathode material and a preparation method thereof. The lithium-ion battery cathode material synthesized by this method has better cycle performance and charge-discharge capacity. Background technique [0002] Since the advent of lithium-ion secondary batteries in the 1990s, because of their advantages such as large specific energy, small self-discharge, long cycle life, light weight and environmental friendliness, they have become an ideal power source for portable electronic products, and also become an ideal power source for future electric vehicles, One of the preferred power sources for hybrid electric vehicles, space technology, and the defense industry. At present, in commercially produced lithium-ion batteries, the cost of cathode materials accounts for about 40% of the cost of the entire battery. Therefore, searching for high-performance cathode materials has become a r...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/60H01M10/0525
CPCY02E60/122H01M4/606H01M4/625H01M10/0525C01B32/23Y02E60/10
Inventor 阮艳莉齐平平王坤胡建新
Owner TIANJIN POLYTECHNIC UNIV
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