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Lithium ion battery positive electrode material ferric hydroxyphosphate and preparation method thereof

A technology of lithium ion battery and ferric hydroxyphosphate, applied in the field of electrochemistry, can solve the problems of high resistivity and large capacity attenuation, and achieve the effects of convenient operation, low preparation cost and simple preparation process

Inactive Publication Date: 2017-08-25
HENAN POLYTECHNIC UNIV
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  • Summary
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  • Description
  • Claims
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Problems solved by technology

[0003] But on the other hand LiFePO 4 The resistivity is large, and the electrochemical process is controlled by diffusion, so that the capacity attenuation is large during high-current discharge. Generally, the appropriate synthesis process is used to improve its conductivity, such as: coating carbon, adding carbon to make composite materials, doping Heterometallic ions and addition of metal powders to induce nucleation

Method used

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  • Lithium ion battery positive electrode material ferric hydroxyphosphate and preparation method thereof
  • Lithium ion battery positive electrode material ferric hydroxyphosphate and preparation method thereof
  • Lithium ion battery positive electrode material ferric hydroxyphosphate and preparation method thereof

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preparation example Construction

[0026] A method for preparing iron hydroxyphosphate as the cathode material for lithium-ion batteries, comprising the following steps:

[0027] 1) Take 2.39mol / L of H 3 PO 4 The solution is put into the polytetrafluoroethylene hydrothermal reaction kettle, and then the FeCl 3 Pour the solid powder into the reaction kettle, then add water, stir evenly, and the Fe in the obtained solution 3+ :PO 4 The molar ratio of the mixture is 1:3~1:5, and methyltriethylammonium chloride is continuously added to adjust the pH value during stirring, and the stirring is stopped when the pH is 2.0~3.5;

[0028] 2) Control the heating rate of 10°C / min, raise the temperature of the reactor to 150-200°C for hydrothermal synthesis reaction for 30 hours, and obtain the reaction solution;

[0029] 3) The reaction liquid obtained in step 2) was separated by centrifugation and washed by adding absolute ethanol, and the obtained filter cake was dried in the air environment to obtain the lithium-ion ...

Embodiment 1

[0032] A preparation method for lithium-ion battery cathode material iron hydroxyphosphate, comprising the following steps:

[0033] 1) Take 2.39mol / L of H 3 PO 4 Put 16.7ml of the solution into the polytetrafluoroethylene hydrothermal reaction kettle, then weigh 1.703g FeCl 3 Pour the solid powder into the reaction kettle, then add 20ml of water, stir the obtained solution evenly, continuously add methyltriethylammonium chloride to adjust the pH value during the stirring process, and stop stirring when the pH is 2.5;

[0034] 2) Control the heating rate of 10°C / min, raise the temperature of the reactor to 150°C for hydrothermal synthesis reaction for 30 hours, and obtain the reaction solution;

[0035] 3) The reaction solution obtained in step 2) was separated by centrifugation and washed with absolute ethanol, and the obtained filter cake was dried at 90°C in the air environment to obtain the lithium-ion battery cathode material Fe 2.95 (PO4) 2 (OH) 2 .

[0036] The re...

Embodiment 2

[0038] A preparation method for lithium-ion battery cathode material iron hydroxyphosphate, comprising the following steps:

[0039] 1) Take 2.39mol / L of H 3 PO 4 The solution is put into the polytetrafluoroethylene hydrothermal reaction kettle, and then the FeCl 3 Pour the solid powder into the reaction kettle, then add water, stir evenly, and the Fe in the obtained solution 3+ :PO 4 The mol ratio of the mixture is 1:3, constantly adding methyltriethylammonium chloride to adjust the pH value during stirring, and stopping stirring when the pH is 2.0;

[0040] 2) Control the heating rate of 10°C / min, raise the temperature of the reactor to 200°C for hydrothermal synthesis reaction for 30 hours, and obtain the reaction solution;

[0041] 3) The reaction liquid obtained in step 2) was separated by centrifugation and washed by adding absolute ethanol, and the obtained filter cake was dried at 80°C in the air environment to obtain the lithium-ion battery cathode material Fe 2....

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Abstract

The invention relates to a cathode material Fe<2.95>(PO4)2(OH)2 of a lithium ion battery and a preparation method thereof. The formula of the cathode material of the lithium ion battery is Fe<2.95>(PO4)2(OH)2. The preparation method comprises the following steps of: adding H3PO4 solution and FeCl3 solid powder to water and uniformly mixing; adding methyl triethyl ammonium chloride, adjusting pH to be 2.0-3.5, controlling a temperature to be 150-200 DEG C, and carrying out hydrothermal synthesis for 30 hours to obtain a reaction liquid; and centrifugally separating, cleaning and drying the reaction liquid to obtain Fe<2.95>(PO4)2(OH)2. The cathode material and the preparation method have the characteristics of process simplicity, safety, low cost and the like, and are suitable for production at a large scale, ferric ion is taken as a reactant, a protective atmosphere or reducing atmosphere is unnecessarily added, cost is reduced, and the product is dried in the air without adding the protective atmosphere.

Description

technical field [0001] The invention relates to the field of electrochemistry, in particular to a lithium ion battery anode material hydroxyferric phosphate and a preparation method thereof. Background technique [0002] Lithium iron phosphate is cheap, environmentally friendly, has good structural stability and thermal stability, is compatible with most electrolytes, and remains stable under overcharged conditions. Its theoretical capacity is 170mAh / g, and its operating voltage is about 3.45V. It has become a new generation of lithium-ion cathode material with the most potential for development and application, and is expected to be used in power batteries and energy storage batteries. [0003] But on the other hand LiFePO 4 The resistivity is large, and the electrochemical process is controlled by diffusion, so that the capacity attenuation is large during high-current discharge. Generally, the appropriate synthesis process is used to improve its conductivity, such as: co...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/58H01M4/139H01M10/0525
CPCH01M4/139H01M4/5825H01M10/0525Y02E60/10
Inventor 陈泽华麻鹏程孙广曹建亮王晓冬孟哈日巴拉张传祥张战营
Owner HENAN POLYTECHNIC UNIV