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LiMnPO4/C lithium ion battery anode material prepared by template method and preparation method of anode material

A lithium-ion battery and cathode material technology, applied in the field of electrochemical energy, can solve the problems of low ionic conductivity and electronic conductivity, low diffusion coefficient, hindering industrialization, etc., and achieves short reaction time, simple reaction, and reaction temperature. mild effect

Inactive Publication Date: 2015-06-24
SOUTH CHINA NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] But LiMnPO 4 There are two fatal flaws: Li + In LiMnPO 4 The medium diffusion coefficient is not large, and the specific capacity is obviously exhausted when charging and discharging at a high rate; the ionic conductivity and electronic conductivity are both low, and it is only suitable for small current charging and discharging, thus hindering the process of its industrialization

Method used

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  • LiMnPO4/C lithium ion battery anode material prepared by template method and preparation method of anode material
  • LiMnPO4/C lithium ion battery anode material prepared by template method and preparation method of anode material
  • LiMnPO4/C lithium ion battery anode material prepared by template method and preparation method of anode material

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Effect test

Embodiment 1

[0031] (1) Take 1mol / L H 3 PO 4 solution and 1mol / L LiOH solution according to Li + : PO 4 3- The amount of substances is mixed in a beaker at a ratio of 3:1, according to Surfactant: Li + The ratio of the amount of substances is 1:20, add 1.5g CTAB (cetyltrimethylammonium bromide) to the corresponding volume of the above H 3 PO 4 solution and LiOH solution, mixed, stirred evenly, and then ultrasonically reacted at 35°C with an ultrasonic frequency of 40KHz for 20min to make Li 3 PO 4 Precipitate, collect Li by filtration 3 PO 4 Precipitate, wash Li with deionized water and then with absolute ethanol 3 PO 4 Precipitate until the washing solution is neutral, thus obtaining the washed Li 3 PO 4 precipitation, the washed Li 3 PO 4 The precipitate was dried at 80 °C for 6 h to obtain Li 3 PO 4 , then calcined in air atmosphere at 500 °C for 2 h, then slowly cooled to room temperature with the furnace, and then ground and pulverized to obtain crystalline Li 3 PO 4...

Embodiment 2

[0037] (1) Take 1mol / L H 3 PO 4 solution and 1mol / L LiOH solution according to Li + : PO 4 3- The amount of substances is mixed in a beaker at a ratio of 3:1, according to Surfactant: Li + The ratio of the amount of substances is 1:20, add 1.5g CTAB (cetyltrimethylammonium bromide) to the corresponding volume of the above H 3 PO 4 solution and LiOH solution, mix and stir evenly, and then ultrasonically react at 35°C with an ultrasonic frequency of 35KHz for 5min to make Li 3 PO 4 Precipitate, collect Li by filtration 3 PO 4 Precipitate, wash Li with deionized water and then with absolute ethanol 3 PO 4 Precipitate until the washing solution is neutral, thus obtaining the washed Li 3 PO 4 precipitation, the washed Li 3 PO 4 The precipitate was dried at 60 °C for 12 h to obtain Li 3 PO 4 , then calcined at 300°C in an air atmosphere for 3 hours, then slowly cooled to room temperature with the furnace, and then ground and pulverized to obtain crystalline Li 3 PO ...

Embodiment 3

[0042] (1) Take 1mol / L H 3 PO 4 solution and 1mol / L LiOH solution according to Li + :PO 4 3- The amount of substances is mixed in a beaker at a ratio of 3:1, according to Surfactant: Li + The ratio of the amount of substances is 1:20, add 1.5g CTAB (cetyltrimethylammonium bromide) to the corresponding volume of the above H 3 PO 4 solution and LiOH solution, mixed, stirred evenly, and then ultrasonically reacted at 35°C with an ultrasonic frequency of 40KHz for 20min to make Li 3 PO 4 Precipitate, collect Li by filtration 3 PO 4 Precipitate, wash Li with deionized water and then with absolute ethanol 3 PO 4 Precipitate until the washing solution is neutral, thus obtaining the washed Li 3 PO 4 precipitation, the washed Li 3 PO 4 The precipitate was dried at 110 °C for 2 h to obtain Li 3 PO 4 , then calcined in air atmosphere at 400 °C for 1 h, then slowly cooled to room temperature with the furnace, and then ground and pulverized to obtain crystalline Li 3 PO 4...

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Abstract

The invention discloses a LiMnPO4 / C lithium ion battery anode material prepared by a template method and a preparation method of the anode material. According to the preparation method, crystalline Li3PO4 is prepared by a certain method, LiMnPO4 nano granules are prepared by taking the crystalline Li3PO4 as a template and using a high-pressure reaction kettle one-step solvothermal method (the method has more advantages than other methods, including simple reaction, short reaction time, mild reaction temperature, favorable crystallinity and high purity) to form LiMnPO4 precursors, and then carbon coating is formed by pyrolysis of nitrogenous polymers so as to improve the electrochemical performance of LiMnPO4 / C. The LiMnPO4 / C prepared by the method provided by the invention adopts a simplex olivine structure; LiMnPO4 / C crystals are rod-shaped granules that are controllable in appearance, dispersed uniformly and about 70*300 nm in size, have favorable electrochemical performance, and achieve high specific capacity and favorable cycle performance under the conditions of indoor temperature and high-current density; under 0.1 C multiplying power, a discharge platform is about 4.0 V and the discharge specific capacity can reach 107 mAh / g.

Description

Technical field: [0001] The invention belongs to the field of electrochemical energy, in particular to LiMnPO prepared by a template method 4 / C Lithium-ion battery cathode material and preparation method thereof. Background technique: [0002] Lithium-ion batteries are widely used in various electronic devices, such as laptop computers, mobile phone batteries, digital cameras, portable lighting equipment, etc. At the same time, it is also used in electric tools, electric bicycles and electric vehicles. With the gradual consumption of the world's oil resources and the gradual improvement of society's requirements for environmental protection, electric vehicles have obtained unprecedented development opportunities. Using lithium-ion batteries as the power source of electric vehicles is the development direction of electric vehicles. [0003] In lithium-ion batteries, the cathode material occupies a very important position and is also the focus of the current development of...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/62H01M4/58C01B25/45B82Y30/00B82Y40/00
CPCY02E60/10
Inventor 左晓希汤思涵南俊民
Owner SOUTH CHINA NORMAL UNIVERSITY