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Preparation method of Na-doped lithium iron phosphate composite anode material for coating surface of metal

A composite positive electrode material, lithium iron phosphate technology, applied in the direction of battery electrodes, electrical components, circuits, etc., can solve the problem of low conductivity, achieve high specific capacity, good conductivity and cycle stability, and improve ion diffusion performance Effect

Inactive Publication Date: 2013-10-23
上海德朗能动力电池有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, LiFePO 4 The key problem is that the conductivity is very low

Method used

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] According to the chemical formula Li 0.83 Na 0.17 FePO 4 The molar amounts of Li, Na, Fe, P in Li, Li, ferrous oxalate, ammonium dihydrogen phosphate and sodium bicarbonate are weighed, and mixed mechanically to form mixture one; after mixture one and acetone are mixed in a weight ratio of 1:1 Mill in a planetary ball mill at a rotational speed of 400r / min for 15h, place the ball-milled mixture 2 in a vacuum dryer and dry at a temperature of 100°C for 18h to obtain a powder, and pulverize the obtained powder with a crushing device.

[0018] The pulverized powder was placed in a reducing atmosphere furnace and pretreated at a temperature of 500° C. for 12 hours to obtain a Na-doped lithium iron phosphate precursor; the nano-lithium iron phosphate precursor was sintered under a reducing protective atmosphere to The temperature was raised at a rate of °C / min, sintered at a constant temperature of 750 °C for 15 hours, and the temperature was lowered at 10 °C / min to prepar...

Embodiment 2

[0021] According to the chemical formula Li 0.75 Na 0.25 FePO 4 The molar amounts of Li, Na, Fe, P in Li, Fe oxalate, ammonium dihydrogen phosphate and sodium bicarbonate are weighed, and mixed mechanically to form mixture one; after mixture one and acetone are mixed in a weight ratio of 1:2 Mill in a planetary ball mill at a speed of 500r / min for 10h, place the ball-milled mixture 2 in a vacuum dryer and dry at 150°C for 12h to obtain a powder, and pulverize the obtained powder with a crushing device.

[0022] The pulverized powder was placed in a reducing atmosphere furnace and pretreated at a temperature of 600 ° C for 10 h to obtain a Na-doped lithium iron phosphate precursor; the nano-lithium iron phosphate precursor was sintered under a reducing protective atmosphere, and the The temperature was raised at a rate of °C / min, the temperature was sintered at a constant temperature of 800 °C for 10 h, and the temperature was lowered at 15 °C / min to prepare Na-doped lithium ...

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Abstract

The invention relates to a preparation method of a Na-doped lithium iron phosphate composite anode material for coating the surface of a metal. The preparation method comprises the following steps of: (1) weighing lithium carbonate, ferrous oxalate, ammonium dihydrogen phosphate and sodium bicarbonate according to the molar weights of Li, Na, Fe and P in a chemical formula Lil-xNaxFePO4, and preparing Na-doped lithium iron phosphate by a solid-phase method; and (2) hydrolyzing and precipitating to realize Na doping, namely drying the Na-doped lithium iron phosphate on which a hydrolysis product is adsorbed, roasting the dried Na-doped lithium iron phosphate, on the surface of which the hydrolysis product is adsorbed, so as to form the Na-doped lithium iron phosphate anode material coated by rubidium oxide. The potassium and manganese doped lithium iron phosphate composite anode material with high conductivity for a lithium ion battery, prepared by the method, has the advantages that the ion diffusion property of the anode material is improved by doping Na in the lithium iron phosphate for modification, and the anode material has good electrical conductivity and cycling stability by coating the anode material with the rubidium oxide.

Description

Technical field [0001] The invention relates to a method for preparing a metal surface-coated Na-doped lithium iron phosphate composite positive electrode material. Background technique [0002] With the rapid development of the battery industry, in order to solve many problems such as battery life, energy density, self-discharge or quality, various types of batteries have emerged. At present, due to the advantages of high energy density, long service life, light weight, and small self-discharge, lithium batteries have become the preferred power source for portable devices such as communication equipment and notebook computers, and have also begun to be applied to electric vehicles, national defense, etc. in large equipment. [0003] Lithium iron phosphate material is a cathode material for power lithium-ion batteries that has emerged in recent years and has been applied in large-scale industrialization. It has the property of intercalating and deintercalating lithium reve...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/58H01M4/62
CPCY02E60/12Y02E60/10
Inventor 王媛媛
Owner 上海德朗能动力电池有限公司
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