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Preparation of Mesoporous Lithium Iron Phosphate/Carbon Microribbon Cathode Material for Lithium Batteries by Electrospinning

A mesoporous lithium iron phosphate, electrospinning technology, applied in battery electrodes, circuits, electrical components, etc., can solve problems such as poor high-rate charge and discharge performance

Inactive Publication Date: 2019-04-16
XINJIANG UNIVERSITY
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Problems solved by technology

[0008] The purpose of the present invention is to provide a method for synthesizing the mesoporous lithium iron phosphate / carbon microribbon composite of the positive electrode material of lithium ion battery by electrospinning technology, so as to solve the poor high rate charge and discharge performance of the existing lithium iron phosphate positive electrode material Shortcomings

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  • Preparation of Mesoporous Lithium Iron Phosphate/Carbon Microribbon Cathode Material for Lithium Batteries by Electrospinning
  • Preparation of Mesoporous Lithium Iron Phosphate/Carbon Microribbon Cathode Material for Lithium Batteries by Electrospinning
  • Preparation of Mesoporous Lithium Iron Phosphate/Carbon Microribbon Cathode Material for Lithium Batteries by Electrospinning

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Embodiment Construction

[0018] (1) LiH 2 PO 4 , Fe(NO 3 ) 3 Add in distilled water, dissolve and add glycerol, stir for 10 min, then add N,N-dimethylformamide (DMF), stir for 20 min, add polyvinylpyrrolidone (PVP), stir for 10 h to obtain a transparent spinning solution.

[0019] (2) Electrospin the spinning solution prepared in (1). The positive high voltage is adjusted to about 18KV, the negative high voltage is adjusted to about -2KV, the distance between the receiver and the injector is about 18 cm, the relative humidity is 10%, and the temperature is 40 °C.

[0020] (3) Pre-oxidize the spun polymer membrane in air.

[0021] (4) The pre-oxidized precursor was mixed with H at a volume ratio of 5:95 2 / N 2 Calcination is carried out under protective gas.

[0022] (5) Naturally cool to room temperature in a tube furnace to prepare mesoporous ribbon-shaped lithium iron phosphate / carbon composite samples.

[0023] (6) The compound synthesized under the conditions described in the present inve...

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Abstract

The invention discloses a method for preparing a lithium battery mesoporous lithium iron phosphate / carbon micro-ribbon positive electrode material through an electrospinning method. The method comprises the following steps: adding LiH2PO4 and Fe(NO3)3 into distilled water according to a proportion of 1:1, adding glycerol after dissolving, adding N,N-dimethylformamide (DMF), stirring, adding polyvinylpyrrolidone (PVP), and stirring to obtain a transparent spinning solution; performing electrospinning on the prepared spinning solution; pre-oxidizing a spun high-molecular membrane in the air; calcining a pre-oxidized precursor under a reducing atmosphere; and naturally cooling to the room temperature in a tubular furnace to obtain a sample. A mesoporous material is synthesized by a non-template method, and has the advantages of low cost, simple method and environment-friendly process.

Description

technical field [0001] The invention belongs to the technical field of high-energy batteries, in particular to the technical field of synthesizing cathode materials for lithium-ion batteries. Background technique [0002] Lithium-ion battery cathode material olivine-type lithium iron phosphate (LiFePO 4 ) is cheap, non-toxic, good environmental compatibility, rich in mineral resources, high battery cycle capacity (theoretical capacity 170 mAh g -1 , energy density 550Wh g -1 ), good thermal stability, long service life, good overcharge resistance and other advantages, it is considered to be a more promising and safer anode material for a new generation of lithium-ion power batteries. However, low electronic conductivity and Li-ion diffusion rate limit their practical applications. [0003] Currently, for olivine LiFePO 4 The research on modification mainly focuses on (1) improving the synthesis process, (2) ion doping, and (3) surface coating. Electrospinning is a metho...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/58
CPCH01M4/364H01M4/5805Y02E60/10
Inventor 黄玉代张月贾殿赠
Owner XINJIANG UNIVERSITY
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