A high-magnification olivine-type phosphate nano-flake positive electrode material and its preparation method

A nano-flake and olivine-type technology, which is applied in the direction of nanotechnology, nanotechnology, nanotechnology for materials and surface science, etc., can solve the problem of shape, size unevenness, and rate performance that are difficult to meet the needs of new energy vehicle applications, etc. problem, to achieve the effect of uniform size, improved conductivity, and improved rate performance

Active Publication Date: 2018-05-18
ANHUI UNIVERSITY OF TECHNOLOGY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] The purpose of the present invention is to overcome existing olivine type LiMPO 4 The rate performance of the cathode material is difficult to meet the application requirements of new energy vehicles, and its shape and size are not uniform enough. A high-rate olivine-type phosphate nano-flake cathode material and its preparation method are provided.

Method used

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  • A high-magnification olivine-type phosphate nano-flake positive electrode material and its preparation method
  • A high-magnification olivine-type phosphate nano-flake positive electrode material and its preparation method
  • A high-magnification olivine-type phosphate nano-flake positive electrode material and its preparation method

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Embodiment 1

[0038] A high-magnification olivine-type phosphate nano-flake cathode material of this embodiment, the olivine-type phosphate cathode material LiMPO 4 (M stands for Fe, Mn or Co element) in nanosheet structure, nanosheet LiMPO 4 The thickness is 3-8nm, which can significantly improve the LiMPO 4 The rate performance of the positive electrode material can meet the high power demand of lithium-ion batteries for new energy vehicles. The aforementioned LiMPO 4 The surface is covered with a uniform carbon layer, which further improves its electrical conductivity, and its performance is relatively stable.

[0039] The preparation method of the above-mentioned high-magnification olivine-type phosphate nano-flake positive electrode material of the present embodiment, the steps are:

[0040] (1) Accurately weigh 50mg NH 4 FePO 4 ·H 2 O powder was dissolved in 100 mL of deionized water, and then sheared and stirred at room temperature using a shearing stirrer. The power of the she...

Embodiment 2

[0053] The preparation method of the above-mentioned high-magnification olivine-type phosphate nano-flake positive electrode material of the present embodiment, the steps are:

[0054] (1) Accurately weigh 100mg NH 4 CoPO 4 ·H 2 O powder was dissolved in 50 mL of deionized water, and then sheared and stirred at room temperature using a shearing stirrer. The power of the shearing stirrer was: 200 W, the rate of shearing and stirring was 10000 r / min, and the time was 24 h. Then take the supernatant and centrifuge at 500r / min for 5min to remove the large particles that have not been peeled off, then take the supernatant and centrifuge at 8000r / min for 60min. Then, the product obtained after the first step of centrifugation is centrifuged and washed with ethanol solvent, the centrifugation rate is 6000r / min, the time is 60min, the number of washings is 3 times, and finally placed in an oven and dried at 60°C for 12h to obtain NH 4 CoPO 4 ·H 2 O nanoflakes.

[0055] (2) Weigh...

Embodiment 3

[0058] The preparation method of the above-mentioned high-magnification olivine-type phosphate nano-flake positive electrode material of the present embodiment, the steps are:

[0059] (1) Accurately weigh 50mg NH 4 PPML 4 ·H 2 O powder was dissolved in 500mL deionized water, and then sheared and stirred at room temperature using a shearing stirrer. The power of the shearing stirrer was: 500W, the rate of shearing stirring was 20000r / min, and the time was 5h. Then take the supernatant and centrifuge at 300r / min for 15min to remove the large particles that have not been peeled off, then take the supernatant and centrifuge at 12000r / min for 20min. Then, the product obtained after the first step of centrifugation is centrifuged and washed with ethanol solvent, the centrifugation rate is 9000r / min, the time is 20min, the number of washings is 5 times, and finally placed in an oven and dried at 60°C for 12h to obtain NH 4 PPML 4 ·H 2 O nanoflakes.

[0060] (2) Weigh 744mg of ...

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Abstract

The invention discloses a high-rate olivine-type phosphate nanosheet positive electrode material and a preparation method thereof, belonging to the technical field of a battery material and preparation thereof. The phosphate nanosheet positive electrode material LiMPO4 is of a nanosheet structure, the thickness of the phosphate nanosheet positive electrode material is 3-8 nanometers, and the surface of the phosphate nanosheet positive electrode material is coated with a uniform carbon layer. The preparation method of the above phosphate nanosheet positive electrode material LiMPO4 comprises the following steps of adding NH<4>MPO<4>.H<2>O powder to deionized water, cutting and stirring the obtained product in a room temperature, and stripping the obtained product to form NH<4>MPO<4>.2H<2>O nanosheets; carrying out ultrasonic dispersing of the NH<4>MPO<4>.2H<2>O nanosheets and a macromolecule surfactant to obtain the surfactant coated NH<4>MPO<4>.2H<2>O nanosheets; and carrying out lithiation processing on the surfactant coated NH<4>MPO<4>.2H<2>O nanosheet and a lithium source. The LiMPO4 prepared according to the method has relatively high specific capacity, stable cycle performance and excellent rate performance, and the morphology and the size of the LiMPO4 are controllable.

Description

technical field [0001] The invention belongs to the technical field of battery materials and preparation thereof, and more specifically relates to a high-magnification olivine-type phosphate nano-flake cathode material and a preparation method thereof. Background technique [0002] The continuous development of new energy is an important basis for the sustainable development of human society. With the advancement of science and technology and the arrival of low-carbon economy, the comprehensive and efficient development and utilization of new green energy has attracted extensive attention from researchers at home and abroad. At present, people's demand for mobile energy is becoming stronger and stronger, especially the demand for pure electric vehicles is continuously strengthened with the intensification of oil and environmental crises. Electrochemical energy storage has the advantages of high energy density, fast response time, low maintenance cost, flexibility and conveni...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/58H01M4/62H01M10/0525B82Y30/00B82Y40/00
CPCB82Y30/00B82Y40/00H01M4/366H01M4/5825H01M4/625H01M10/0525Y02E60/10
Inventor 芮先宏徐莲花陈光徐进良孙运兰朱宝忠
Owner ANHUI UNIVERSITY OF TECHNOLOGY
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