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A kind of method for preparing lithium manganese phosphate/graphene nanosheets in aqueous system

A graphene nanosheet, lithium manganese phosphate technology, applied in graphene, phosphate, nanocarbon and other directions, can solve the problems of difficult to achieve industrialization, high temperature and pressure, harsh reaction conditions, etc., to shorten the transmission distance, reduce Effect of surface tension, mild reaction conditions

Active Publication Date: 2021-12-24
HENAN NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The invention patent with the patent application number 201310278122.2 discloses an amorphous carbon that cracks graphene and organic carbon sources to form a conductive network to improve LiMnPO 4 The conductivity of the particles, but the method used in this method is a high temperature and high pressure hydrothermal reaction, which requires high temperature and pressure, and the reaction conditions are extremely harsh, making it difficult to realize industrialization

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  • A kind of method for preparing lithium manganese phosphate/graphene nanosheets in aqueous system
  • A kind of method for preparing lithium manganese phosphate/graphene nanosheets in aqueous system
  • A kind of method for preparing lithium manganese phosphate/graphene nanosheets in aqueous system

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Embodiment 1

[0025] Step S1: Dissolve 0.15 mol of lithium hydroxide in 30 mL of deionized water to obtain solution A, add 0.05 mol of manganese acetate and 0.05 mol of phosphoric acid into 70 mL of deionized water, then add 19.6 mg of graphene oxide and ultrasonically disperse to obtain a solution containing graphene oxide solution B, add 1mL of alkyl glucoside nonionic surfactant APG06 and solution A to solution B in sequence under stirring;

[0026] Step S2: Place the reaction solution obtained in step S1 in a reaction vessel with a reflux device, and place it under N 2 Under protection, reflux reaction at 100°C for 25h, and the obtained precipitate was centrifuged at 8000r / min, washed with deionized water and vacuum-dried at 80°C for 12h to obtain lithium manganese phosphate / graphene nanosheets. In the lithium manganese phosphate / graphene nanosheets The content of graphene is 1wt%.

[0027] XRD analysis proves that the lithium manganese phosphate in the target product is pure olivine p...

Embodiment 2

[0029] Step S1: Dissolve 0.15 mol of lithium hydroxide in 30 mL of deionized water to obtain solution A, add 0.05 mol of manganese acetate and 0.05 mol of phosphoric acid into 70 mL of deionized water, then add 9.8 mg of graphene oxide and ultrasonically disperse to obtain a solution containing graphene oxide solution B, add 3mL of alkyl glucoside non-ionic surfactant APG0810 and solution A to solution B in sequence under stirring;

[0030] Step S2: Place the reaction solution obtained in step S1 in a reaction vessel with a reflux device, and place it under N 2 Reflux reaction at 100°C for 36h under protection, and the resulting precipitate was centrifuged at 8000r / min, washed with deionized water and vacuum-dried at 80°C for 12h to obtain lithium manganese phosphate / graphene nanosheets. In the lithium manganese phosphate / graphene nanosheets The content of graphene is 0.5wt%.

[0031] XRD analysis proves that the lithium manganese phosphate in the target product is pure olivi...

Embodiment 3

[0033] Step S1: Dissolve 0.3 mol of lithium hydroxide in 30 mL of deionized water to obtain solution A, add 0.1 mol of manganese chloride and 0.1 mol of phosphoric acid into 70 mL of deionized water, then add 19.6 mg of graphene oxide and ultrasonically disperse to obtain a solution containing graphite oxide Solution B of alkenes, add 2mL of alkyl glucoside nonionic surfactant APG1214 and solution A to solution B in sequence under stirring;

[0034] Step S2: Place the reaction solution obtained in step S1 in a reaction vessel with a reflux device, and place it under N 2 Reflux reaction at 100°C for 48h under protection, and the resulting precipitate was centrifuged at 8000r / min, washed with deionized water and vacuum-dried at 100°C for 12h to obtain lithium manganese phosphate / graphene nanosheets. In the lithium manganese phosphate / graphene nanosheets The content of graphene is 0.5wt%.

[0035] XRD analysis proves that the lithium manganese phosphate in the target product is ...

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Abstract

The invention discloses a method for preparing lithium manganese phosphate / graphene nanosheets in an aqueous phase system. The specific process is as follows: using deionized water as a reaction medium, using lithium hydroxide, soluble manganese salt and phosphoric acid as raw materials, in the reaction Add a small amount of alkyl glucoside nonionic surfactant (the number of carbon atoms of the alkyl group is ≥6) and graphene oxide into the system, and reflux at 100°C for 25-48 hours under normal pressure to prepare lithium manganese phosphate / graphene nanosheets . The invention avoids the harsh conditions of high temperature and high pressure required by the solvothermal method and the subsequent high temperature purification treatment, the process is simple, the reaction conditions are mild, and the reagent used is deionized water, which is environmentally friendly.

Description

technical field [0001] The invention belongs to the technical field of preparation of lithium manganese phosphate, a cathode material of a lithium ion battery, and specifically relates to a method for preparing lithium manganese phosphate / graphene nanosheets in an aqueous phase system. Background technique [0002] Due to the advantages of safety, cleanliness and convenience, chemical energy storage power sources represented by lithium-ion batteries are not only widely used in portable electrical appliances such as mobile phones and notebooks, but also gradually in the fields of large electrical appliances such as electric tools and electric vehicles. More and more applications. While enjoying the modern communication and transportation powered by lithium-ion batteries, people also have to bear the environmental pollution caused by the production of these battery materials. Therefore, while researching and exploring high-energy, long-life, high-safety and cheap battery mate...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/58H01M4/583H01M4/62H01M10/42H01M10/0525C01B32/182C01B25/26C01B25/45C01B25/37
CPCH01M4/362H01M4/5825H01M4/583H01M4/625H01M10/4235H01M10/0525C01B32/182C01B25/26C01B25/45C01B25/377Y02E60/10
Inventor 常照荣付小宁汤宏伟李苞上官恩波
Owner HENAN NORMAL UNIV