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Short pore passage mesoporous cathode material for lithium ion battery and preparation method

A lithium-ion battery and cathode material technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of nano-material preparation process and high production cost, and alleviate the problems of poor low-temperature discharge performance, electrical conductivity and lithium ion diffusion rate The effect of increasing and increasing the diffusion rate

Active Publication Date: 2018-11-23
桑顿新能源科技(长沙)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, compared with market demand, lithium iron phosphate materials and their battery performance still need continuous improvement and improvement, such as ion doping to improve the conductivity of the material and the diffusion rate of lithium ions. There are still differences; the preparation process and production of nanomaterials The cost requirement is relatively high; in addition, in addition to considering the feasibility study under laboratory conditions, the production requirements of large-scale industrialization must also be considered, which need further research

Method used

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  • Short pore passage mesoporous cathode material for lithium ion battery and preparation method
  • Short pore passage mesoporous cathode material for lithium ion battery and preparation method

Examples

Experimental program
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Effect test

Embodiment 1

[0038]Add 4.4g of cetyltrimethylammonium bromide (CTAB), 147g of deionized water, and 10.3g of phosphoric acid into the reaction kettle, stir for 4 hours at 45°C, and then slowly add 2.14g of Zirconium oxychloride, 14.3g ferric chloride and 6.5g lithium acetate, after continuing to stir for 24h, transfer the reaction mixture into a polytetrafluoroethylene-lined stainless steel hydrothermal kettle, crystallize at 100°C for 24h, use Filter and wash with ionic water to obtain a precipitate, dry the precipitate, then raise the temperature to 600°C at a rate of 4°C / min under the protection of Ar atmosphere, and continue to bake for 6h to obtain the short-channel mesoporous positive electrode Material; the pore length of the short-channel mesoporous cathode material detected by scanning electron microscopy is 300nm, the thickness of the carbon coating is 3nm, and the conductivity measured by the probe method is 1.10×10 -2 S / cm.

[0039] The method of making the experimental battery...

Embodiment 2

[0042] Add 4.4g of cetyltrimethylammonium bromide (CTAB), 147g of deionized water, and 10.3g of phosphoric acid into the reaction kettle, stir for 4 hours at 45°C, and then slowly add 1.78g of Zirconium oxychloride, 14.6g ferric chloride and 6.5g lithium acetate, after continuing to stir for 24h, transfer the reaction mixture into a polytetrafluoroethylene-lined stainless steel hydrothermal kettle, crystallize at 100°C for 24h, use Filter and wash with ionic water to obtain a precipitate, dry the precipitate, and then raise the temperature to 600°C at a rate of 4°C / min under the protection of Ar atmosphere, and continue to bake for 6h to obtain the short-channel mesoporous positive electrode Material; the pore length of the short-channel mesoporous cathode material detected by scanning electron microscopy is 500nm, the thickness of the carbon coating is 2nm, and the conductivity measured by the probe method is 1.07×10 -3 S / cm.

[0043] An experimental battery was prepared acc...

Embodiment 3

[0046] Add 4.4g of octadecyldimethylbenzyl quaternary ammonium chloride, 147g of deionized water, and 10.3g of phosphoric acid into the reaction kettle, stir at 45°C for 4h, and then slowly add 2.67g of Zirconium oxychloride, 13.8g ferric chloride and 6.5g lithium acetate, after continuing to stir for 24h, transfer the reaction mixture into a polytetrafluoroethylene-lined stainless steel hydrothermal kettle, crystallize at 100°C for 24h, use Filter and wash with ionized water to obtain a precipitate, dry the precipitate, and then raise the temperature to 680°C at a rate of 4°C / min under the protection of an Ar atmosphere, and continue to bake for 6 hours to obtain the short-channel mesoporous cathode Material; the pore length of the short-channel mesoporous cathode material detected by scanning electron microscopy is 580nm, the thickness of the carbon coating is 4nm, and the conductivity measured by the probe method is 6.01×10 -4 S / cm.

[0047] An experimental battery was pre...

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Abstract

The invention discloses a short pore passage mesoporous cathode material for a lithium ion battery and a preparation method. The short pore passage mesoporous cathode material adopts a simple method to combine doping, coating and material nanocrystallization together. The short pore passage mesoporous cathode material is formed by double modification of carbon coating and Zr doping, and the pore passage length is between 200-400 nm. The preparation method adopts a cationic surface active agent as a carbon source and support, a Zr source is added, and the novel short pore passage mesoporous cathode material is prepared by adopting a one-step hydrothermal method. The short pore passage mesoporous cathode material prepared by the method can improve the conductivity of a LiFePO4 cathode material of the lithium ion battery and the diffusion rate of lithium ions, alleviates the poor low-temperature discharge performance to some extent, and expands the application to new energy vehicles.

Description

technical field [0001] The invention belongs to the technical field of lithium-ion batteries, and in particular relates to a short-channel mesoporous cathode material of a lithium-ion battery and a preparation method thereof. Background technique [0002] With the increasingly serious energy crisis in the world and the shortage of petroleum resources as the main power energy, it is imminent to research and develop a new generation of alternative products. At present, all countries have given strong financial investment and policy support in the field of new energy, including lithium-ion batteries. Lithium-ion batteries have high energy power density, no memory effect, long cycle life, and high working voltage platform. As a high-density energy storage technology, high-efficiency energy conversion technology, and relatively clean and environmentally friendly, it has gradually entered people's field of vision. , has become the focus of people's attention, has been developed t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/58H01M4/583H01M10/0525
CPCH01M4/366H01M4/5825H01M4/583H01M10/0525H01M2004/021Y02E60/10
Inventor 李蒙程兴邢伟伟王星星周艳兵王佳希李小兵
Owner 桑顿新能源科技(长沙)有限公司
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