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Preparation method of transition metal oxide/graphene composite material, lithium ion battery negative pole and lithium ion battery

A lithium-ion battery and transition metal technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve problems such as uneven distribution of transition metal oxides, uneven distribution of nitrogen-doped graphene, and shedding of transition metal oxides , to achieve the effects of reducing volume change, low cost, and improving electrical and thermal conductivity

Inactive Publication Date: 2017-10-24
ANHUI NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Chinese invention patent (publication number CN105514363A) "Mn used as negative electrode of lithium ion battery 3 o 4 / RGO nanocomposite preparation method" announced a Mn 3 o 4 The synthesis method of / RGO nanocomposite needs to go through multi-step operation and hydrothermal reaction, and the Mn 3 o 4 The uniformity of distribution on graphene is poor, and it is difficult to synthesize in batches
For example, Co prepared by hydrothermal method in Zhang Mengmeng et al. 3 o 4 / Nitrogen-doped graphene composites, Co 3 o 4 Inhomogeneous distribution on nitrogen-doped graphene affects its performance in lithium-ion batteries
To sum up, most graphene composites are currently a mixed state of graphene and transition metal oxides. The distribution of transition metal oxides on graphene is uneven. During the process of lithium insertion / delithiation, transition metal oxides are easy to Graphene falls off, which reduces the conductivity and ultimately affects the performance of lithium-ion batteries

Method used

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  • Preparation method of transition metal oxide/graphene composite material, lithium ion battery negative pole and lithium ion battery
  • Preparation method of transition metal oxide/graphene composite material, lithium ion battery negative pole and lithium ion battery
  • Preparation method of transition metal oxide/graphene composite material, lithium ion battery negative pole and lithium ion battery

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Effect test

Embodiment 1

[0053] The preparation method of ferric oxide and graphene composite material comprises the following steps:

[0054] Hydrothermal process: weigh 5.0g graphite and 3.75g NaNO respectively 3 Put it into a 1L beaker, stir vigorously, slowly add 150mL of concentrated sulfuric acid, stir for 0.5 hours, then slowly add 20g of KMnO 4 , Added in 0.5 hours, and continued to stir for 20 hours, because the viscosity of the reactant increased, the stirring was stopped, and a paste-like purple-red substance was obtained. After standing for 5 days, slowly add 500mL deionized water and 30mL H 2 o 2 At this time, the color of the solution becomes more obvious bright yellow. After the solution is fully reacted, it is centrifuged and washed to obtain graphite oxide. Dissolve 70mg of graphite oxide in 80mL of deionized water, add 6mL of concentrated sulfuric acid (ρ=1.84g / cm 3 ), ultrasonically dispersed for 3 hours, the solution was moved into a small glass bottle, and then it was transfer...

Embodiment 2

[0057] The preparation method of nickel oxide and graphene composite material comprises the following steps:

[0058] Hydrothermal process: weigh 5.0g graphite and 3.75g NaNO respectively 3 Put it into a 1L beaker, stir vigorously, slowly add 150mL of concentrated sulfuric acid, stir for 0.5 hours, then slowly add 20g of KMnO 4 , Added in 0.5 hours, and continued to stir for 20 hours, because the viscosity of the reactant increased, the stirring was stopped, and a paste-like purple-red substance was obtained. After standing for 5 days, slowly add 500mL deionized water and 30mL H 2 o 2 At this time, the color of the solution becomes more obvious bright yellow. After the solution is fully reacted, it is centrifuged and washed to obtain graphite oxide. Dissolve 100mg of graphite oxide in 80mL of deionized water, add 8mL of concentrated sulfuric acid, ultrasonically disperse for 3 hours, transfer the solution into a small glass bottle, and then transfer it to 5 hydrothermal rea...

Embodiment 3

[0061] The preparation method of tricobalt tetroxide and graphene composite material comprises the following steps:

[0062] Hydrothermal process: weigh 5.0g graphite and 3.75g NaNO respectively 3 Put it into a 1L beaker, stir vigorously, slowly add 150mL of concentrated sulfuric acid, stir for 0.5 hours, then slowly add 20g of KMnO 4 , Added in 0.5 hours, and continued to stir for 20 hours, because the viscosity of the reactant increased, the stirring was stopped, and a paste-like purple-red substance was obtained. After standing for 5 days, slowly add 500mL deionized water and 30mL H 2 o 2 At this time, the color of the solution becomes more obvious bright yellow. After the solution is fully reacted, it is centrifuged and washed to obtain graphite oxide. Dissolve 120mg of graphite oxide in 80mL of deionized water, add 10mL of concentrated sulfuric acid, disperse ultrasonically for 3 hours, transfer the solution into a small glass bottle, then transfer it to 5 hydrothermal...

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Abstract

The invention relates to a preparation method of a transition metal oxide / graphene composite material, a lithium ion battery negative pole and a lithium ion battery. The preparation method comprises the following steps: soaking three-dimensional reduction-oxidation graphene in a soaking solution containing transition metal salt, and carrying out predecomposition and roasting after freeze drying. The transition metal oxide / graphene composite material prepared in the invention is applied to lithium ion batteries, and has the excellent performances such as high capacity, long cycle life, low cost and mass production.

Description

technical field [0001] The invention relates to the technical field of nanometer materials, in particular to a preparation method of several transition metal oxide / graphene composite materials, a negative electrode of a lithium ion battery, and a lithium ion battery. Background technique [0002] Since the 21st century, the reserves of non-renewable energy (such as oil, natural gas, etc.) have been declining and the cost of energy consumption has been rising. The energy crisis and environmental pollution have attracted widespread attention. Therefore, the development of green energy and the improvement of energy utilization have become important issues for the sustainable development of society. With people's increasing energy demand, electric energy has become the most widely used, most convenient and least polluting secondary energy in modern society. Among these numerous energy storage devices, electrochemical energy storage devices play an important role. Lead-acid bat...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/50H01M4/52H01M4/48H01M4/62H01M4/131H01M10/0525
CPCH01M4/131H01M4/364H01M4/48H01M4/50H01M4/52H01M4/625H01M10/0525Y02E60/10
Inventor 谷翠萍崔艳威黄家锐
Owner ANHUI NORMAL UNIV
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