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Method for quickly preparing rapid-charging graphene-based positive electrode material

A graphene-based, cathode material technology, applied in battery electrodes, electrical components, circuits, etc., can solve the problems of unsuitable control of the purity of lithium iron phosphate, inability of graphene to be uniformly dispersed, and easy to grow and agglomerate grains. Stability, simple and reliable production process, environment-friendly effect

Inactive Publication Date: 2018-02-02
NANCHANG HANGKONG UNIVERSITY
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Problems solved by technology

However, there are still many problems in the traditional solid-phase synthesis method, such as: graphene cannot be uniformly dispersed on the active material; the purity of lithium iron phosphate is not suitable for control; high proportion of olefin

Method used

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  • Method for quickly preparing rapid-charging graphene-based positive electrode material
  • Method for quickly preparing rapid-charging graphene-based positive electrode material
  • Method for quickly preparing rapid-charging graphene-based positive electrode material

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Embodiment

[0016] 1. Batching process: use an electronic balance to accurately weigh 30.3 g of ferric nitrate nonahydrate, 10.0 g of citric acid monohydrate, and 7.8 g of lithium dihydrogen phosphate to prepare an orange-yellow solution, and then add the graphene oxide solution dropwise to the previous solution , sonicate for 0.5h, and stir for more than 1h to obtain a spray precursor.

[0017] 2. Spray pyrolysis process; turn on the tube furnace to heat to the specified temperature, with H 2 / Ar mixed gas is passed into the spray pyrolysis system as the reducing gas and carrier gas, and the micron-sized liquid droplets produced by the ultrasonic atomizer are brought into the pyrolysis reaction furnace by the carrier gas, and the drying and thermal decomposition are completed at high temperature. The physical and chemical reaction process forms regular spherical particles.

[0018] 3. Collection; the black powder collected at the collector is the final product. The collector must mai...

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Abstract

The invention discloses a method for quickly preparing a rapid-charging graphene-based positive electrode material. The method includes the steps of preparing a lithium iron phosphate precursor solution with specific concentration from iron nitrate nonahydrate as an iron source, lithium dihydrogen phosphate as a phosphorus source and a lithium source and citric acid monohydrate as a carbon source,adding a proper quantity of graphene oxide solution with ultrasonic operation and stirring sufficiently to ensure that graphene is dispersed in the solution evenly, adding the prepared solution intoa liquid storage tank, and subjecting the prepared solution to spray pyrolysis in the reduced atmosphere so as to obtain a black powder product. The method has the advantages that compared with traditional solid-phase mixing, the graphene is mixed with raw materials in the solution state, and even dispersion and coating of the graphene on an active material can be achieved to guarantee stability and uniformity of the black powder product; the black powder product is synthesized by one-step spray pyrolysis, and accordingly the method is simple and reliable in production technology, uniform in product stability, low in energy consumption, environment friendly and suitable for large-scale industrial production.

Description

technical field [0001] The invention relates to a simple method for preparing a fast-charging graphene-based positive electrode material. Background technique [0002] As a key link in lithium-ion batteries—cathode material technology is currently a key factor that seriously restricts the widespread application and development of lithium-ion batteries. The development of high-power, high-capacity, low-cost, safe and stable cathode materials has increasingly become a widespread market demand. recognition and urgency. Olivine-type lithium iron phosphate has become one of the positive electrode materials with the most application potential and development value due to its excellent cycle performance, outstanding safety performance, environmental friendliness, and low price. However, due to the structural characteristics of lithium iron phosphate itself, its electronic conductivity and ion migration rate are low, which greatly limits its application in high-current charging and...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/583
CPCH01M4/583Y02E60/10
Inventor 次素琴李豪邓雯陈静婷
Owner NANCHANG HANGKONG UNIVERSITY
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