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Graphene nano-ribbon-based lithium iron phosphate composite material and preparation method and application thereof

A technology based on lithium iron phosphate and nano strips, which is applied in the direction of nanotechnology, nanotechnology, nanotechnology for materials and surface science, etc., can solve the problem of limited improvement in the conductivity of amorphous carbon, decreased battery energy density, block Solve the problems of uneven heating of bulk materials, and achieve the effect of good ion and electronic conductivity, high conductivity, and uniform heating

Inactive Publication Date: 2019-08-02
SUZHOU INST OF NANO TECH & NANO BIONICS CHINESE ACEDEMY OF SCI +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In the process of preparing lithium iron phosphate by high-temperature solid-state carbon reduction, problems such as uneven distribution of carbon sources, limited improvement in the conductivity of amorphous carbon, a decrease in battery energy density due to excessive amorphous carbon, and uneven heating of bulk materials often occur.
Moreover, the existing carbon-coated lithium iron phosphate material is used as an active electrode material for a power lithium-ion battery, which has problems such as poor conductivity and low rate capacity.

Method used

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  • Graphene nano-ribbon-based lithium iron phosphate composite material and preparation method and application thereof
  • Graphene nano-ribbon-based lithium iron phosphate composite material and preparation method and application thereof
  • Graphene nano-ribbon-based lithium iron phosphate composite material and preparation method and application thereof

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preparation example Construction

[0032] As an aspect of the technical solution of the present invention, it relates to a graphene nanoribbon-based lithium iron phosphate composite material (also known as lithium iron phosphate / amorphous carbon / graphene nanoribbon composite active material) Preparation method, which comprises:

[0033] Mix ferric compound, lithium source, phosphorus source, carbon source, graphene oxide nanoribbons and solvent uniformly and dry to obtain precursor powder;

[0034] The precursor powder is sintered at a high temperature in a protective atmosphere to obtain a graphene nanoribbon-based lithium iron phosphate composite material.

[0035] In some embodiments, the molar ratio of ferric element, lithium element and phosphorus element in the graphene nanoribbon-based lithium iron phosphate composite material is 1:(1.01˜1.05):1.

[0036] Further, the content of carbon element in the graphene nanoribbon-based lithium iron phosphate composite material is 1-5 wt%.

[0037] Further, the m...

Embodiment 1

[0071] In this embodiment, the preparation process of graphene nanoribbon-based lithium iron phosphate composite material (hereinafter referred to as "lithium iron phosphate / amorphous carbon / graphene nanoribbon composite active material") comprises the following steps:

[0072] 1) Mix 0.21g of graphene oxide nanoribbons, 45.25g of iron phosphate, 11.42g of lithium carbonate, 6.94g of glucose monohydrate, and 160g of deionized water, and stir at a high speed of 1000r / min for 2h to obtain a uniformly mixed precursor slurry material;

[0073] 2) Spray-dry the precursor slurry (at an inlet temperature of 270°C) and dry it in a vacuum oven at 60°C overnight;

[0074] 3) Put the precursor powder into a tube furnace, raise the temperature to 750°C at a rate of 10°C / min in a nitrogen atmosphere, and then sinter at a constant temperature for 4 hours. After the powder is naturally cooled to room temperature, use a jet mill to pulverize the particles to obtain iron phosphate Lithium / amo...

Embodiment 2

[0077] In this embodiment, the preparation process of lithium iron phosphate / amorphous carbon / graphene nanoribbon composite active material comprises the following steps:

[0078] 1) Mix 0.57g of graphene oxide nanoribbons, 40g of iron oxide, 52.48g of lithium dihydrogen phosphate, 11.58g of glucose monohydrate, and 156g of deionized water, and stir at a high speed of 1000r / min for 2h to obtain a uniformly mixed precursor slurry;

[0079] 2) Spray-dry the precursor slurry (at an inlet temperature of 270°C) and dry it in a vacuum oven at 60°C overnight;

[0080] 3) Put the precursor powder into a tube furnace, raise the temperature to 900°C at a rate of 10°C / min in a nitrogen atmosphere, and then sinter at a constant temperature for 2 hours. After the powder is naturally cooled to room temperature, use a jet mill to pulverize the particles to obtain iron phosphate Lithium / amorphous carbon / graphene nanoribbon composite active materials.

[0081] The total carbon content in the...

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Abstract

The invention discloses a graphene nano-ribbon-based lithium iron phosphate composite material and a preparation method and an application thereof. The preparation method comprises steps that the graphene oxide nanoribbon, the ferric compound, a lithium source, a phosphorus source, a carbon source and the solvent are uniformly mixed and dried to obtain precursor powder; the precursor powder is sintered at the high temperature in the protective atmosphere, and the graphene nano-ribbon-based lithium iron phosphate composite material is obtained. The method is advantaged in that the process is simple, the graphene nanoribbon is utilized together with the amorphous carbon as a reducing agent to convert ferric iron into divalent iron, the formation of impurities can be reduced, the short time is taken, the method is safe, environmentally friendly and non-toxic, the graphene nano nanoribbon and the amorphous carbon are utilized to composite a conductive carbon shell, electronic conductivitycan be improved without hindering insertion and extraction of lithium ions, and the obtained graphene nano-ribbon-based lithium iron phosphate composite material has high specific capacity, superior electrical conductivity and electrochemical performance and good rate performance and has a wide range of applications in the battery field.

Description

technical field [0001] The present invention relates to a lithium ion battery cathode material and a preparation process thereof, in particular to a graphene nanoribbon-based lithium iron phosphate composite material, its preparation method and its application in lithium ion battery cathode materials and lithium ion batteries. It belongs to the technical field of lithium ion batteries. Background technique [0002] In 1800, Volta invented the world's first battery by using zinc and copper as electrodes and sulfuric acid as electrolyte. At the beginning of the 20th century, due to the maturity and wide application of internal combustion engine technology, the research and development and technical application of batteries were at a standstill. However, in order to meet the needs of high-power and heavy-duty applications, battery technology entered a period of rapid development. Lithium-ion batteries Appeared in 1990, due to its advantages of environmental protection, safety,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/58H01M4/62H01M10/0525B82Y30/00
CPCB82Y30/00H01M4/366H01M4/5825H01M4/625H01M10/0525H01M2004/021H01M2004/028Y02E60/10
Inventor 刘立伟钱雨婷李奇王汝冰郭玉芬李伟伟
Owner SUZHOU INST OF NANO TECH & NANO BIONICS CHINESE ACEDEMY OF SCI
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