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Method for synthesizing liquid phase of anode material LiFePO4/C powder of lithium ion battery

A technology for lithium-ion batteries and positive electrode materials, applied in battery electrodes, circuits, electrical components, etc., can solve the problems of easy oxidation of ferrous iron, achieve the effects of uniform particles, reduce energy consumption and oxidation, and simplify the experimental process

Active Publication Date: 2011-09-07
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The present invention solves the technical problem that divalent iron is easily oxidized in the process of existing liquid-phase synthesis of lithium-ion battery cathode materials; and provides lithium-ion battery cathode materials LiFePO 4 A new liquid-phase synthesis method for / C powder

Method used

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  • Method for synthesizing liquid phase of anode material LiFePO4/C powder of lithium ion battery
  • Method for synthesizing liquid phase of anode material LiFePO4/C powder of lithium ion battery
  • Method for synthesizing liquid phase of anode material LiFePO4/C powder of lithium ion battery

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specific Embodiment approach 1

[0013] Specific embodiment one: the liquid phase synthesis method of lithium iron phosphate lithium ion battery cathode material in the present embodiment is carried out according to the following steps:

[0014] 1. Weigh 0.2 mol of ferric nitrate and dissolve it in 200 mL of deionized water, add 0.1 mol of iron powder, and react in a closed container for 1-2 hours to obtain solution A;

[0015] 2. At room temperature, add the solution A obtained in step 1 into 0.3 mol of triphenyl phosphate, and add 0.3 mol to 0.36 mol of Li while stirring vigorously + and carbon source, the amount of carbon source added makes LiFePO 4 The carbon content in the / C powder is 5% to 15% (weight), and the mixture B is obtained;

[0016] 3. At room temperature and in an air atmosphere, use ammonia water to adjust the pH value of the mixture B obtained in step 2 to 2-3, and intermittently stir the reaction for 1-4 hours, and stir for 1 minute every 10 minutes; obtain the mixture C;

[0017] 4. Sp...

specific Embodiment approach 2

[0020] Specific embodiment two: the difference between this embodiment and specific embodiment one is that Li described in step two + Provided by lithium hydroxide solution, lithium acetate solution, lithium nitrate solution or lithium oxalate solution with a concentration of 1mol / L. Other steps and parameters are the same as in the first embodiment.

specific Embodiment approach 3

[0021] Specific embodiment three: the difference between this embodiment and specific embodiment one or two is: the carbon source described in step two is one of glucose, sucrose, polyethylene glycol, β-cyclodextrin, lauric acid and epoxy resin species or a mixture of them. Other steps and parameters are the same as those in Embodiment 1 or Embodiment 2.

[0022] In this embodiment, when the carbon source is a mixture, each carbon source is mixed in any ratio.

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Abstract

The invention provides a method for synthesizing a liquid phase of anode material LiFePO4 / C powder of a lithium ion battery, belonging to the manufacturing field of the anode materials of the lithium ion batteries. The method is used for solving the problem that ferrous irons are easy to oxide during the liquid phase is synthesized into the anode material of the lithium ion battery. The method comprises the following steps: 1, dissolving ferric nitrate into deionized water, adding iron powder and reacting in a closed container; 2, adding to triphenyl phosphate as well as severely stirring andadding Li<+> and a carbon source; 3, regulating the pH value and discontinuously stirring; 4, carrying out spray drying at the same time of discontinuously stirring; and 5, presintering and calciningto obtain LiFePO4 / C powder. In the method, the triphenyl phosphate is taken as a phosphate radical source, which is hydrolyzed to generate organic benzene; the organic benzene generated by the hydrolyzation is used to separate a liquid phase reaction system from air, thus preventing oxidizing the ferrous irons, thereby being in no need of inert gas shielding in the process of the liquid phase reaction; and in addition, the organic benzene generated by the hydrolyzation can form azeotrope with water, thus reducing the temperature of the spray drying and decreasing energy consumption and oxidization.

Description

technical field [0001] The invention belongs to the field of lithium ion battery cathode material preparation; in particular relates to lithium ion battery cathode material LiFePO 4 / C powder liquid phase synthesis method. Background technique [0002] LiFePO 4 Due to the advantages of stable platform, good safety, low cost, long service life and no environmental pollution, cathode materials are recognized as the cathode materials with the most development potential. The material synthesized by the liquid phase method has the advantages of uniform particles and stable performance. However, most of the current liquid phase synthesis uses expensive ferrous iron as the raw material, and it needs to be carried out under the protection of an inert gas. It is easy for industrial production; at the same time, during the spray drying process, due to the high temperature, the oxidation of divalent iron will also be caused, which seriously affects the electrochemical performance of ...

Claims

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Application Information

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IPC IPC(8): H01M4/139H01M4/1397
CPCY02E60/12Y02E60/122Y02E60/10
Inventor 顾大明隋旭磊王振波钱克俭张毅董怡辰
Owner HARBIN INST OF TECH
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