Preparation method of iron oxide cathode material for lithium ion battery

A technology for lithium ion batteries and negative electrode materials, which is applied in the directions of iron oxide, battery electrodes, iron oxide/iron hydroxide, etc., to achieve the effects of simple preparation process, convenient large-scale production, and improved cycle stability

Active Publication Date: 2013-07-31
UNIV OF SCI & TECH BEIJING
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  • Abstract
  • Description
  • Claims
  • Application Information

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  • Preparation method of iron oxide cathode material for lithium ion battery
  • Preparation method of iron oxide cathode material for lithium ion battery
  • Preparation method of iron oxide cathode material for lithium ion battery

Examples

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Embodiment 1

[0027] Weigh 4.8663 g of inorganic iron salt, dissolve it in 100 ml of absolute ethanol, add 5.4 ml of deionized water, and stir evenly to form an orange-yellow solution; under stirring conditions, add 20.97 ml of propylene oxide dropwise to the solution, and stir evenly After a certain period of time, a gel was formed after standing; add absolute ethanol to the gel for aging, replace the absolute ethanol every 24 h, repeat 3 times; dry the gel at room temperature for 2 days, and then put it in 80 o C oven dried for 2 days to obtain the precursor product. Under the air atmosphere, the temperature of the precursor product was raised to 600 oC for 3 h, and cooled to room temperature with the furnace to prepare nano-iron oxide negative electrode material powder. The prepared 70 wt.% iron oxide material, 15 wt.% acetylene black and 15 wt.% PVdF were mixed evenly to make a slurry, which was uniformly coated on the copper foil, and punched into a circle after vacuum drying. Shaped...

Embodiment 2

[0030] Weigh 4.8663 g of inorganic iron salt, dissolve it in 60 ml of absolute ethanol, add 8.1 ml of deionized water, and stir evenly to form an orange-yellow solution; under stirring conditions, add 16.25 ml of propylene oxide dropwise to the solution, and stir evenly After a certain period of time, a gel was formed after standing; add absolute ethanol to the gel for aging, replace the absolute ethanol every 24 h, repeat 3 times; dry the gel at room temperature for 2 days, and then put it in 100 o C oven dried for 2 days to obtain the precursor product. Under the air atmosphere, the temperature of the precursor product was raised to 600 o C for 3 h, and cooled to room temperature with the furnace to prepare nano-iron oxide negative electrode material powder. The prepared 70 wt.% iron oxide material, 15 wt.% acetylene black and 15 wt.% PVdF were mixed evenly to make a slurry, which was uniformly coated on the copper foil, and punched into a circle after vacuum drying. Shape...

Embodiment 3

[0033] Weigh 4.8663 g of inorganic iron salt, dissolve it in 100 ml of absolute ethanol, add 5.4 ml of deionized water, and stir evenly to form an orange-yellow solution; under stirring conditions, add 24.12 ml of propylene oxide dropwise to the solution, and stir evenly After a certain period of time, a gel was formed after standing; add absolute ethanol to the gel for aging, replace the absolute ethanol every 24 h, repeat 3 times; dry the gel at room temperature for 2 days, and then put it in 80 o C oven dried for 2 days to obtain the precursor product. Under the air atmosphere, the temperature of the precursor product was raised to 800 o C for 3 h, and cooled to room temperature with the furnace to prepare nano-iron oxide negative electrode material powder. The prepared 70 wt.% iron oxide material, 15 wt.% acetylene black and 15 wt.% PVdF were mixed evenly to make a slurry, which was uniformly coated on the copper foil, and punched into a circle after vacuum drying. Shape...

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Abstract

The invention discloses a preparation method of an iron oxide cathode material for lithium ion battery, which belongs to the fields of new material and electrochemistry. The invention employs a sol-gel method and normal pressure drying technology for preparing an iron oxide precursor with xerogel or aerogel structure, and after a heat treatment technology, the iron oxide cathode material is parpared. The invention also employs a carbon cladding technology for preparing iron oxide / carbon composite material. The invention has the advantages that the prepared material is fine and uniform particle powder, and the preparation technology process is simple with mild condition and low cost, and is convenient for large scale preparation. The iron oxide cathode material and iron oxide / carbon composite cathode material has higher circulating ratio capacity and good circulating stability, and is used as an ideal lithium ion battery cathode material, and has latent application prospects in the fields of portable electronic equipment, electric automobile and aviation spaceflight, etc.

Description

[0001] technical field [0002] The invention belongs to the field of new materials and electrochemistry, and in particular relates to a novel rechargeable and dischargeable lithium ion battery iron oxide negative electrode material and a preparation method thereof. technical background [0003] With the rapid development of portable electronic devices and electric vehicles, research on high-performance lithium-ion batteries has become the focus of global attention. At present, the negative electrode of commercial lithium-ion batteries uses graphite negative electrode material. After a lot of improvement work, the actual lithium storage capacity of graphite is getting closer and closer to its theoretical capacity (the theoretical capacity of graphite is 372 mAh / g, 855 mAh / cm 3 ), so the potential to further increase its specific capacity is very limited. In order to meet the demand for high-capacity anode materials for high-performance lithium-ion batteries, it is necessa...

Claims

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Application Information

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IPC IPC(8): H01M4/52C01G49/06B82Y30/00
CPCY02E60/12Y02E60/10
Inventor 赵海雷吕鹏鹏李兴旺王捷曾志鹏刘欣
Owner UNIV OF SCI & TECH BEIJING
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