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Method for synthesizing manganese phosphate lithium sol-gel doped with other metal ions

A lithium manganese phosphate sol, metal ion technology, applied in electrical components, battery electrodes, circuits, etc., can solve the problems of shortening lithium ion diffusion channels, low electronic conductivity, shortening reaction time, etc., and achieves easy commercial production and operation. Simple, Inexpensive Effects

Inactive Publication Date: 2012-11-07
TIANJIN YOULIANG LITHIUM ENERGY TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0013] The purpose of the present invention is to overcome the deficiencies of the prior art, to provide a method for synthesizing lithium manganese phosphate sol-gel doped with other metal ions, to improve the large particle size and low electronic conductivity of existing lithium manganese phosphate particles, The problem of low discharge capacity, minimize the reaction time, shorten the lithium ion diffusion channel, and retain the stable olivine structure of lithium manganese phosphate

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  • Method for synthesizing manganese phosphate lithium sol-gel doped with other metal ions
  • Method for synthesizing manganese phosphate lithium sol-gel doped with other metal ions
  • Method for synthesizing manganese phosphate lithium sol-gel doped with other metal ions

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Embodiment 1

[0039] A kind of manganese phosphate lithium sol-gel synthesis method doped with other metal ions, the steps are as follows:

[0040](1) Preparation of sol: Lithium carbonate, manganese citrate, ferric citrate, phenolic resin, phosphoric acid and citric acid are dissolved in deionized water, wherein the molar ratio of lithium, manganese, iron and phosphorus in the mixture is 1.05:0.75:0.25: 1. The molar ratio of the added complexing agent to lithium source is 1:1, stir until the solution is clear.

[0041] (2) Gel preparation: Stir the clear solution obtained in step (1) vigorously at 60°C and evaporate the solvent until it becomes viscous, then dry the obtained viscous substance in a blast oven at 120°C, pulverize it, and then put it into a ball mill Ball milled for 1h to obtain the mixture powder.

[0042] (3) Calcining at high temperature: transfer the mixture powder obtained in step (2) to a porcelain boat, and calcining at 550°C for 6 hours under an inert atmosphere to o...

Embodiment 2

[0044] A kind of manganese phosphate lithium sol-gel synthesis method doped with other metal ions, the steps are:

[0045] (1) Preparation of sol: Dissolve lithium acetate, manganese acetate, magnesium acetate, glucose, phosphoric acid, and glycolic acid in deionized water, wherein the molar ratio of lithium, manganese, magnesium, and phosphorus in the mixture is 1.05:0.95:0.05:1. The molar ratio of the added complexing agent to lithium source is 1:1, and stirred until the solution is clear.

[0046] (2) Gel preparation: Stir the clear solution obtained in step (1) vigorously at 60°C and evaporate the solvent until it becomes viscous, dry the obtained viscous substance in a blast oven at 120°C, pulverize it and put it into a ball mill for ball milling 1h, the mixture powder was obtained.

[0047] (3) High-temperature calcination: transfer the mixture powder obtained in step (2) to a porcelain boat, and calcine at 600°C for 6 hours under an inert atmosphere to obtain a finishe...

Embodiment 3

[0049] A kind of manganese phosphate lithium sol-gel synthesis method doped with other metal ions, the steps are:

[0050] (1) Preparation of sol: Dissolve lithium carbonate, manganese citrate, ferric citrate, glucose, phosphoric acid and citric acid in deionized water, wherein the molar ratio of lithium, manganese, iron and phosphorus in the mixture is 1.025:0.90:0.10:1 , the molar ratio of the added complexing agent to lithium source is 1:1, stir until the solution is clear.

[0051] (2) Gel preparation: Stir the clear solution obtained in step (1) vigorously at 60°C and evaporate the solvent until it becomes viscous, dry the obtained viscous substance in a blast oven at 120°C, pulverize it and put it into a ball mill for ball milling 1h, the mixture powder was obtained.

[0052] (3) High-temperature calcination: transfer the mixture powder obtained in step (2) to a porcelain boat, and calcine at 650°C for 6 hours under an inert atmosphere to obtain the finished product of ...

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Abstract

The invention relates to a method for synthesizing manganese phosphate lithium sol-gel doped with other metal ions. The method comprises the following steps: (1) dissolving a lithium source compound, a manganese source compound, a metal ion compound, a carbon source compound, a phosphorus source compound and a complexing agent in deionized water, wherein the molar ratio of the complexing agent to the lithium source compound is 0.5-2.5; (2) stirring a settled solution strongly and evaporating the solution until a viscous substance is obtained, and performing drying and ball milling on the viscous substance in a blasting drying box to obtain a mixed powder; and (3) transferring the mixed powder into a ceramic boat, and performing calcinations under the atmosphere of indifferent gas under the temperature of 500-800 DEG C for 1-24 hours to obtain a manganese phosphate lithium product doped with other metal ions. The method provided by the invention has the advantgages of improving the electric conductivity of materials effectively and largely improving the cycle performance of materials, has also the advantages of good evenness of the synthesized manganese phosphate lithium sol-gel doped with the other metal ions, low production cost, simple operation and easiness to realize commercialized production.

Description

technical field [0001] The invention belongs to the technical field of new materials, and relates to a synthesis scheme of lithium manganese phosphate, in particular to a synthesis method of lithium manganese phosphate sol-gel doped with other metal ions. Background technique [0002] The continuous progress of electrode materials is the key to promoting the development of lithium-ion battery technology. Advanced electrode materials constitute the core technology for the current replacement of lithium-ion batteries. At present, the positive electrode materials mainly include lithium cobalt oxide, lithium manganese oxide, ternary materials and transition metal phosphates. Lithium cobalt oxide has been industrially produced, but cobalt resources are scarce, expensive, highly toxic, and poor in safety. The low electrochemical capacity and poor high temperature performance of lithium manganese oxide limit its application. [0003] Lithium-containing phosphate LiMPO4 has an oli...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/62H01M4/58
CPCY02E60/12Y02E60/10
Inventor 杨新
Owner TIANJIN YOULIANG LITHIUM ENERGY TECH
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