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Method for preparing manganese lithium phosphate/carbon composite material by manganese phosphate

A technology of carbon composite materials and lithium manganese phosphate, which is applied in the direction of electrode manufacturing, structural parts, electrical components, etc., can solve the problems of complex preparation process and difficult purity, achieve simple synthesis process, reduce material diffusion, and increase tap density Effect

Active Publication Date: 2010-03-17
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method only uses two kinds of raw materials, thus can obtain product at lower temperature and shorter time, but NH 4 PPML 4 ·H 2 The preparation process of O is more complicated and the purity is difficult to control

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] A method for preparing lithium manganese phosphate / carbon composite material with manganese phosphate, the method steps are as follows:

[0027] (1) Preparation of manganese phosphate: mix equal volumes of 0.4mol / L manganese nitrate and 0.2mol / L sodium phosphate solution (molar ratio Mn:P=2:1), stir, and adjust the pH with 1mol / L nitric acid solution to 4 (nitric acid is also used as an oxidizing agent to oxidize divalent manganese into trivalent manganese, and the amount of nitric acid used to adjust the pH value can ensure that the oxidizing agent is excessive), after stirring and reacting for 3 hours, suction filtration, washing with deionized water and ethanol successively, dried to obtain active manganese phosphate (MnPO 4 ), the manganese phosphate has water of crystallization;

[0028] (2) Preparation of lithium manganese phosphate / carbon composite material: take active manganese phosphate and lithium carbonate according to the molar ratio Li:Mn=1.05, mix, and a...

Embodiment 2

[0031] A method for preparing lithium manganese phosphate / carbon composite material with manganese phosphate, the method steps are as follows:

[0032] (1) prepare manganese phosphate: the preparation of manganese phosphate is with embodiment 1;

[0033] (2) Preparation of lithium manganese phosphate / carbon composite material: take active manganese phosphate and lithium carbonate according to the molar ratio Li:Mn=1.1, mix, and add phenolic resin-ethanol solution, the content of phenolic resin in the phenolic resin-ethanol solution that adds The amount is 20% of the total mass of active manganese phosphate and lithium carbonate. The above-mentioned substances are ball milled, and ethanol is used as a dispersion medium. After ball milling at a speed of 350rpm for 10 hours, spray drying is carried out, and the dried powder is carried out in a high-purity nitrogen flow. Heat treatment, heating up to 600°C at a heating rate of 5°C / min, and calcining for 12 hours. During the heat t...

Embodiment 3

[0036] A method for preparing lithium manganese phosphate / carbon composite material with manganese phosphate, the method steps are as follows:

[0037] (1) Preparation of manganese phosphate: mix equal volumes of 0.3mol / L manganese chloride and 0.2mol / L potassium phosphate solution (molar ratio Mn:P=1.5:1), stir, add hydrogen peroxide according to stoichiometric ratio, make two Manganese is oxidized to trivalent manganese, and the pH is adjusted to 2 with 1mol / L nitric acid solution, after stirring for 5 hours, suction filtration, washing with deionized water and ethanol successively, drying, to obtain active manganese phosphate (MnPO 4 ), the manganese phosphate has water of crystallization;

[0038] (2) Preparation of lithium manganese phosphate / carbon composite material: take active manganese phosphate and lithium carbonate according to the molar ratio Li: Mn=1.05, mix, and add glucose, the glucose addition is 40% of the total mass of active manganese phosphate and lithium ...

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Abstract

The invention discloses a method for preparing manganese lithium phosphate / carbon composite material by manganese phosphate, belonging to the technical field of energy material, comprising the following steps: firstly, preparing active manganese phosphate (MnPO4), secondly mixing the active manganese phosphate with lithium source and adding carbon source, ball milling and spray drying the materials, conducting heat treatment on the dried powder in the presence of protective atmosphere, heating to 300-850 DEG C and roasting for 2-12 hours and naturally cooling to obtain the manganese lithium phosphate / carbon composite material. The preparation method has low cost and simple synthesis technology, is applied to industrial production; the prepared manganese lithium phosphate / carbon composite material has a primary particle average diameter of 40-500 nm; the synthetic manganese lithium phosphate / carbon composite material has good electrochemical property when taken as the anode material ofthe lithium battery, high specific capacity and nice circulating performance at the conditions of room temperature and large current density; and the specific discharge capacity with 0.1 C multiplyingpower is more than 130 mAh / g.

Description

technical field [0001] The invention belongs to the technical field of energy materials, and in particular relates to a method for preparing lithium manganese phosphate / carbon composite material from manganese phosphate. Background technique [0002] Since the first report in 1997 that olivine-type lithium iron phosphate has the function of reversible lithium intercalation, LiMPO, an olivine-type phosphate-based lithium intercalation material, has 4 (M=Mn, Fe, Co, Ni) has attracted extensive attention as a cathode material for lithium-ion batteries due to its high structural stability. where LiMnPO 4 Relative to Li / Li + The electrode potential of the material is 4.1V, which is located in the stable electrochemical window of the existing electrolyte system, and this material has a theoretical specific capacity as high as 171mAh / g, and has a high energy density. In addition, the raw materials used are abundant, cheap, and environmentally friendly. LiMnPO 4 The material its...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/04H01M4/58H01M4/62
CPCY02E60/12Y02E60/10
Inventor 王莉何向明任建国高剑蒲薇华万春荣姜长印
Owner TSINGHUA UNIV
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