Method for preparing NH4V3O8 anode material for lithium ion battery

A technology for lithium-ion batteries and positive electrode materials, applied in battery electrodes, chemical instruments and methods, circuits, etc., can solve the problems of difficult control of the reaction process, occurrence of side reactions, long reaction time, etc., to improve electrochemical performance, heat Uniform, short preparation cycle results

Active Publication Date: 2015-06-10
安徽翰邦科技咨询有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] However, the precipitation method synthesizes NH 4 V 3 o 8 It has the disadvantages that the reaction process is not easy to control, side reactions occur, and the product purity is low. The hydrothermal method synthesizes NH 4 V 3 o 8 There are disadvantages such as relatively high reaction temperature and long reaction time, so we are looking for a low-temperature, easy-to-control, and rapid synthesis of NH 4 V 3 o 8 The method is of great significance to the research and development of high-performance lithium-ion battery cathode materials and sensor materials

Method used

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  • Method for preparing NH4V3O8 anode material for lithium ion battery
  • Method for preparing NH4V3O8 anode material for lithium ion battery

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Embodiment 1

[0028] A kind of NH for lithium ion battery 4 V 3 o 8 A method for preparing a positive electrode material, comprising the following steps:

[0029]1) Dissolve ammonium metavanadate in deionized water at 60°C to make NH 4 + The concentration of 0.15mol / L NH 4 VO 3 Solution, denoted as A solution;

[0030] 2) Use 6mol·L -1 The hydrochloric acid adjustment pH value of A solution is 2.0, obtains B solution;

[0031] 3) adding 1 to 3 mm of pre-oxidized chopped carbon fibers to solution B according to a mass ratio of 1:10 to obtain solution C;

[0032] 4) The C solution was mechanically stirred at room temperature for 10 min;

[0033] 5) Transfer the C solution into the reactor, and after the reactor is sealed, the inner lining of the reactor is polytetrafluoroethylene, and the filling ratio of the reactor is 50%; The frequency was raised from room temperature to 120°C and kept for 10 minutes, then cooled to 70°C and kept for 30 minutes to obtain a suspension;

[0034] 6...

Embodiment 2

[0038] A kind of NH for lithium ion battery 4 V 3 o 8 A method for preparing a positive electrode material, comprising the following steps:

[0039] 1) Dissolve ammonium metavanadate in deionized water at 80°C to make NH 4 + The concentration is 0.20mol / L of NH 4 VO 3 Solution, denoted as A solution;

[0040] 2) Use 4mol·L -1 The hydrochloric acid adjustment pH value of A solution is 2.4, obtains B solution;

[0041] 3) adding 1 to 3 mm of pre-oxidized chopped carbon fibers to solution B according to a mass ratio of 1:20 to obtain solution C;

[0042] 4) The C solution was mechanically stirred at room temperature for 15 minutes;

[0043] 5) Transfer the C solution into the reactor, and after the reactor is sealed, the inner lining of the reactor is polytetrafluoroethylene, and the filling ratio of the reactor is 50%; The frequency was raised from room temperature to 140°C and kept for 15 minutes, then cooled to 55°C and kept for 24 minutes to obtain a suspension;

...

Embodiment 3

[0046] A kind of NH for lithium ion battery 4 V 3 o 8 A method for preparing a positive electrode material, comprising the following steps:

[0047] 1) Dissolve ammonium metavanadate in deionized water at 70°C to make NH 4 + The concentration is 0.25mol / L of NH 4 VO 3 Solution, denoted as A solution;

[0048] 2) Use 6mol·L -1 The hydrochloric acid adjustment pH value of A solution is 2.8, obtains B solution;

[0049] 3) adding 1 to 3 mm of pre-oxidized chopped carbon fibers to solution B according to a mass ratio of 1:15 to obtain solution C;

[0050] 4) The C solution was mechanically stirred at room temperature for 20 minutes;

[0051] 5) Transfer the C solution into the reactor, and after the reactor is sealed, the inner lining of the reactor is polytetrafluoroethylene, and the filling ratio of the reactor is 50%; The frequency was raised from room temperature to 160°C and kept for 20 minutes, then cooled to 60°C and kept for 28 minutes to obtain a suspension;

...

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Abstract

The invention discloses a method for preparing an NH4V3O8 anode material for a lithium ion battery. The method comprises the steps that ammonium metavanadate is dissolved in deionized water, an NH4VO3 solution is prepared, pre-oxidization short carbon fibers of 1 mm to 3 mm are added, the NH4VO3 solution is transferred into a reaction still after the pH value is adjusted, forced mixing is carried out, after the reaction still is sealed, the reaction still is placed in a water and heat induction heater, and suspension liquid is obtained after a heating reaction; centrifugal separation is carried out on the suspension liquid to obtain a powder product, the powder product is soaked in the deionized water and the absolute ethyl alcohol, repeated washing is carried out, and then drying and grinding are carried out. The NH4V3O8 microcrystal prepared through the method is uniform in chemical component, high in purity and uniform in form, and the electrochemical performance of the material can be effectively improved. The preparation method is simple, low in reaction temperature, short in reaction period, high in productivity, free of any subsequent treatment, environmentally friendly and capable of being suitable for large-scale production.

Description

technical field [0001] The invention relates to a positive electrode material for a lithium ion battery, in particular to an NH material for a lithium ion battery 4 V 3 o 8 Preparation method of cathode material. Background technique [0002] Lithium-ion secondary batteries have the advantages of high voltage, high specific energy, long cycle life, stable discharge performance, good safety, no pollution, and wide operating temperature range. They have broad application prospects and become a research hotspot in recent years. At present, LiCoO is the most widely used cathode material for lithium-ion batteries on the market. 2 , but its actual specific capacity is only 140mAh·g -1 Only about 50% of the theoretical capacity. Other LiFePO such as olivine type 4 , LiMn with spinel structure 2 o 4 and LiNi 1 / 3 mn 1 / 3 co 1 / 3 o 2 The specific capacity of lithium-ion batteries such as positive electrode materials is also low (160mAh g -1 ). Vanadate has attracted much a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/48C01G31/00
CPCY02E60/10
Inventor 黄剑锋李瑞梓李嘉胤曹丽云许占位曹杉杉李文斌李多郭强李豆豆仵婉晨
Owner 安徽翰邦科技咨询有限公司
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