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Method for synthesizing carbon-cladded ironic lithium phosphate

A technology of carbon-coated lithium iron phosphate and microwave synthesis, applied in phosphorus compounds, chemical instruments and methods, inorganic chemistry, etc., can solve problems such as poor thermal conductivity of raw materials, heterogeneous phases inside and outside materials, and affecting material control, etc., to achieve The effect of shortening the production cycle, heating quickly and evenly, and saving energy

Inactive Publication Date: 2006-05-24
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This method does not need inert gas protection, but due to the short heating time and the poor thermal conductivity of the raw materials, the heat cannot be quickly transferred from the outside to the inside of the raw materials, so when the raw material block is large, the internal and external heterogeneity of the material appears, which affects the material preparation. control

Method used

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  • Method for synthesizing carbon-cladded ironic lithium phosphate
  • Method for synthesizing carbon-cladded ironic lithium phosphate
  • Method for synthesizing carbon-cladded ironic lithium phosphate

Examples

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example 1

[0013] Example 1: Lithium carbonate, ferrous oxalate and ammonium dihydrogen phosphate were mixed according to the material ratio of 1:2:2 to obtain the basic raw materials. The above-mentioned basic raw materials, sucrose and heat-conducting agent acetylene black are mixed in a mass ratio of 10:1:0.5, fully ground and mixed with ethanol as a dispersant, and pressed into a block at 10Mpa after drying, with a block thickness of 1.4cm. In a crucible, place the crucible in a microwave oven and sinter on low heat for 5 min. Its XRD diagram is shown in figure 1 , see the second charge and discharge curve at 20mA / g current density figure 2 , the discharge capacity can reach 137mAh / g.

example 2

[0014] Example 2: Lithium carbonate, ferrous lactate and ammonium dihydrogen phosphate were mixed according to the material ratio of 1:2:2 to obtain basic raw materials. The above-mentioned basic raw materials, sucrose and heat-conducting agent acetylene black are mixed in a mass ratio of 10:0.3:1, fully ground and mixed with ethanol as a dispersant, and pressed into a block at 10Mpa after drying. In a crucible, place the crucible in a microwave oven and sinter on low heat for 3 minutes. Its XRD diagram is shown in image 3 , see the second charge and discharge curve at 200mA / g current density Figure 4 , the discharge capacity can reach 111mAh / g.

example 3

[0015] Example 3: Lithium hydroxide, ferrous oxalate and ammonium dihydrogen phosphate were mixed according to the material ratio of 1:1:1 to obtain the basic raw material. Mix the above-mentioned basic raw materials, starch, and activated carbon in a mass ratio of 10:0.3:1.5, use ethanol as a dispersant to fully grind and mix, and after drying, press it into a block at 10Mpa with a thickness of 2.2cm, and place it in a crucible with activated carbon , and then put the crucible in a microwave oven and sinter on low heat for 8 minutes. The fifth charge and discharge curve at 30mA / g current density is shown in Figure 5 , the discharge capacity can reach 144mAh / g.

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Abstract

The invention relates to a carbon coated lithium iron phosphate microwave-synthesizing method, relating to the preparation of anode material of a Li-ion battery. The invention weighs lithium carbonate, iron oxalate and ammonium diacid phosphate, proper amount of heat conduction agent and organic matter in chemical gauging ratio, using anhydrous alcohol as dispersant to fully grind and mix them, drying and pressing the mixture into blocks, placing the blocks in a pot holding activated carbon, and placing the pot in microwave field for irradiative heating so as to be able to make uniform- phase carbon coated lithium iron phosphate. The invention can realize carbon coating of lithium iron phosphate and more rapidly and uniformly heat the raw materials, beneficial to uniform and rapid reaction of massive raw materials. The method can shorten production cycle and reduce energy consumption.

Description

technical field [0001] The invention relates to a preparation method of energy functional materials, in particular to the preparation of positive electrode materials of lithium ion batteries. Background technique [0002] The currently widely used cathode material for lithium-ion batteries is LiCoO with a layered structure. 2 , but due to its high price and high toxicity, looking for an alternative to LiCoO 2 The requirements for cathode materials are getting stronger and stronger. LiFePO with olivine structure 4 Due to its low price, good thermal stability, and no pollution, it has become one of the most potential candidate cathode materials. LiFePO 4 The synthesis methods include solid-phase method and liquid-phase method. Patent CN1401559 mixes a certain proportion of lithium salt, ferrous salt and phosphate and heats it under an inert atmosphere for a certain period of time to obtain LiFePO 4 ; Patent CN1431147A makes a precursor from a solution or suspension of a ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B25/45H01M4/58H01M4/62
CPCY02E60/10
Inventor 王新东王志高李建玲
Owner UNIV OF SCI & TECH BEIJING
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