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Manganese phosphate lithium and carbon nanometer pipe situ compounding anode material and preparation method thereof

A technology of carbon nanotubes and lithium manganese phosphate, which is applied in the field of electrochemistry, can solve problems such as uneven coating and material conductivity limitations, and achieve the effects of simple preparation process, excellent high-rate performance, and improved electronic conductivity

Active Publication Date: 2012-04-11
DONGFANG ELECTRIC CORP LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the carbon coated in the currently reported technology is mostly amorphous carbon and the coating is uneven, which limits the improvement of the material conductivity.

Method used

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  • Manganese phosphate lithium and carbon nanometer pipe situ compounding anode material and preparation method thereof
  • Manganese phosphate lithium and carbon nanometer pipe situ compounding anode material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Li 2 CO 3 , NH 4 h 2 PO 4 and MnCO 3 Lithium source, phosphorus source and manganese source, with Fe 2 o 3 as a catalyst. Weigh according to the stoichiometric ratio of Li, Mn, Fe, P 1.02:0.99:0.01:1, dissolve in a certain amount of ethanol solution to obtain a slurry with a solid content of 60%, according to the mass ratio of ball to material 5:1 The mixture was ball milled at a speed of 300 r / min for 17 hours, and then dried with stirring at 80°C. The powder material obtained by drying and grinding is placed in a rotary kiln. In a mixed atmosphere of 10% acetylene and 90% nitrogen with a gas flow rate of 10L / min, the temperature was raised to 700°C at 5°C / min and roasted at a constant temperature for 14 hours, and then slowly cooled to room temperature in the furnace to obtain gray-black LiMn. 0.99 Fe 0.01 PO 4 / carbon nanotube composites.

[0028] The lithium manganese phosphate material obtained in Example 1 was used to make electrodes according to the ...

Embodiment 2

[0032] Respectively with LiOH, NH 4 h 2 PO 4 and Mn(OH) 2 Lithium source, phosphorus source and manganese source, with Ni(OH) 2 as a catalyst. Weigh according to the ratio of Li, Mn, Ni, P stoichiometric ratio 1.02:0.99:0.01:1, dissolve in a certain amount of acetone solution to obtain a slurry with a solid content of 80%, according to the mass ratio of ball to material 10:1 The mixture was ball milled at 600 r / min for 10 hours, and then dried under stirring at 60°C. The powder material obtained by drying and grinding is placed in a rotary kiln. In a mixed atmosphere of 10% ethane and 90% nitrogen at a gas flow rate of 10L / min, the temperature was raised to 650°C at a rate of 5°C / min and roasted at a constant temperature for 16 hours, and then slowly cooled to room temperature in the furnace to obtain gray-black LiMn. 0.99 Ni 0.01 PO 4 / carbon nanotube composites. Its discharge curve at 0.05 C rate (1C=170 mAh / g) is as follows figure 1 Shown in b.

Embodiment 3

[0034] Li 2 CO 3 , (NH 4 ) 2 HPO 4 and Mn(OH) 2 Lithium source, phosphorus source and manganese source, Fe(OH) 3 as a catalyst. Weigh according to the stoichiometric ratio of Li, Mn, Fe, P 1.05:0.98:0.02:1, dissolve in a certain amount of ethanol solution to obtain a slurry with a solid content of 70%, according to the mass ratio of balls to materials 8:1 The mixture was ball milled at a speed of 400 r / min for 18 hours, and then dried with stirring at 70°C. The powder material obtained by drying and grinding is placed in a rotary kiln. In a mixed atmosphere of 10% ethylene and 90% nitrogen at a gas flow rate of 10L / min, the temperature was raised to 750°C at 5°C / min and roasted at a constant temperature for 12 hours, and then slowly cooled to room temperature in the furnace to obtain gray-black LiMn. 0.98 Fe 0.02 PO 4 / carbon nanotube composites.

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Abstract

The invention provides a manganese phosphate lithium and carbon nanometer pipe situ compounding anode material and a preparation method thereof. The chemical formula of the material is Li ( Mn 1-xMx) PO4, wherein the x is 0-0.1, M is a transition metal Fe, Co or Ni; a carbon nanometer pipe is uniformly distributed in manganese phosphate lithium grains in a synthetic process of the manganese phosphate lithium; a transition metal compound is adopted as a catalyzer and an alloying element so as to catalyze pyrolytic hydrocarbon gas and prepare a situ carbon nanometer pipe compound manganese phosphate lithium material; the preparation method provided by the invention has the advantages that the preparation method is simple, the cost is cheap, the manganese phosphate material purity is high, a structure is full, the conductivity is high, and the electrochemistry performance is excellent.

Description

technical field [0001] The invention relates to lithium manganese phosphate lithium ion battery cathode material and a preparation method thereof, in particular to an in-situ composite cathode material of lithium manganese phosphate and carbon nanotubes and a preparation method thereof, belonging to the field of electrochemistry. Background technique [0002] In 1997, Goodenough et al. reported for the first time the lithium iron phosphate material with the function of reversibly deintercalating lithium ions. Olivine-type polyanionic compound LiMPO 4 (M=Fe, Co, Ni, Mn) have attracted increasing attention as cathode materials for lithium-ion batteries due to their high structural and chemical stability. where LiMnPO 4 The material has a theoretical specific capacity of 170 mAh / g, and the charge-discharge curve of the material is very stable, and the discharge voltage is high (4.1 V vs. Li + / Li). At the same time, the material has the advantages of wide source of raw mat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/58B82Y30/00B82Y40/00
CPCY02E60/12Y02E60/10
Inventor 郑威梁孜王瑨王睿谢皎
Owner DONGFANG ELECTRIC CORP LTD
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