Preparation method for manganese-lithium phosphate and carbon nano tube nanocomposite

A nano-composite material, lithium manganese phosphate technology, applied in the field of positive electrode materials of lithium ion batteries, can solve the problems that the conductivity of lithium manganese phosphate cannot be effectively improved, the degree of graphitization has not been reported, carbon nanotubes, and the catalytic activity of transition metal compounds is low. , to achieve the effect of low preparation cost, simple and easy process, and high degree of graphitization

Inactive Publication Date: 2014-01-15
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Patent 200410051045.8 discloses a method of directly adding carbon nanotubes to lithium iron phosphate cathode material to improve electrical conductivity, but carbon nanotubes have the disadvantages of serious agglomeration and extremely difficult dispersion, and cannot be effectively and uniformly mixed with lithium iron phosphate
Patent 201110397625.2 discloses a method of using Fe, Co or Ni compounds as catalysts and doping elements to catalyze pyrolyzed hydrocarbon gas to prepare in-situ carb

Method used

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  • Preparation method for manganese-lithium phosphate and carbon nano tube nanocomposite
  • Preparation method for manganese-lithium phosphate and carbon nano tube nanocomposite
  • Preparation method for manganese-lithium phosphate and carbon nano tube nanocomposite

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Embodiment 1

[0022] Dissolve 1.26g of lithium hydroxide in 12mL of deionized water and stir, add 1.153g of phosphoric acid with a mass concentration of 85% dropwise and stir for 1h, filter, wash, dry in a vacuum oven at 80°C for 10h, and grind to obtain lithium phosphate , redisperse lithium phosphate in 12mL of deionized water and ultrasonically for 1h, weigh 0.5560g of ferrous sulfate heptahydrate, 1.9607g of manganese acetate tetrahydrate, dissolve in 8mL of deionized water and stir for 30min, then add dropwise to the stirred lithium phosphate suspension After stirring for 1 hour, put it into the reactor and react at 200°C for 10 hours, then remove the supernatant of the reactant, wash the precipitate with deionized water until the pH of the washing solution is 7, filter it with suction, and dry it at 80°C for 10 hours. After grinding, the powder was spread in a quartz boat, and the quartz boat was placed in the constant temperature zone of the tube furnace, and argon gas was introduced ...

Embodiment 2

[0025] The process of preparing lithium manganese phosphate and carbon nanotube nanocomposites in this embodiment is the same as that of Example 1, except that ferrous sulfate heptahydrate is not used in the process, and manganese acetate tetrahydrate is changed from 1.9607g to 2.4509 g was dissolved in 8mL deionized water to finally obtain LiMnPO 4 and carbon nanotube nanocomposites.

Embodiment 3

[0027] The process of preparing lithium manganese phosphate and carbon nanotube nanocomposites in this embodiment is the same as that of Example 1, except that the cobalt nitrate hexahydrate is changed from 0.02 g to 0.04 g and dissolved in 400 mL deionized water for 2 h, and the The same concentration of sodium hydroxide solution was changed from 40mL to 80mL, and was added dropwise to the iron-doped lithium manganese phosphate suspension in stirring to obtain LiMn 0.8 Fe 0.2 PO 4 and carbon nanotube nanocomposites.

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Abstract

The invention relates to a preparation method for a manganese-lithium phosphate and carbon nano tube nanocomposite. The method comprises the following processes: dripping phosphoric acid into a lithium hydroxide solution to prepare lithium phosphate, then adding manganese salt and ferric salt into a lithium phosphate dispersing solution and stirring uniformly to obtain a precursor solution, conducting a heat seal reaction to obtain manganese-lithium phosphate or iron-doped manganese-lithium phosphate, adding the manganese-lithium phosphate or iron-doped manganese-lithium phosphate and cobalt nitrate into deionized water, mixing, then dripping a sodium hydroxide solution, and washing, filtering in a suction manner, grinding, calcinating, reducing and growing a precipitate to obtain the manganese-lithium phosphate and carbon nano tube nanocomposite or an iron-doped manganese-lithium phosphate and carbon nano tube nanocomposite. According to the nanocomposite prepared with the method, a carbon nano tube grows uniformly on the manganese-lithium phosphate, the degree of graphitization is high, the process is simple, the defect of low electronic conductivity of manganese-lithium phosphate or iron-doped manganese-lithium phosphate is overcome, the charge and discharge properties of the nanocomposite are improved, and the application prospect is broad.

Description

technical field [0001] The invention relates to a preparation method of a lithium manganese phosphate and carbon nanotube nanocomposite material, belonging to the technical field of cathode materials for lithium ion batteries. Background technique [0002] With the rapid development of modern integrated circuits, electronic instruments continue to develop in the direction of small and light weight, which puts forward higher requirements for small chemical power supplies: higher capacity, smaller size, lighter weight and longer use Lifespan etc. Traditional secondary batteries, such as lead-acid batteries, nickel-metal hydride batteries, nickel-cadmium batteries, etc. are difficult to meet these requirements. Lithium-ion secondary batteries are favored by people because of their outstanding advantages such as high working voltage, high specific energy, large capacity, small self-discharge, good cycle performance, long service life, light weight, small size, no pollution, an...

Claims

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Application Information

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IPC IPC(8): H01M4/58H01M4/62B82Y30/00
CPCH01M4/5825H01M4/625Y02E60/10
Inventor 师春生王毅赵乃勤何春年刘恩佐李家俊
Owner TIANJIN UNIV
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