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In-situ carbon coating preparation method for secondary lithium ion battery cathode material lithium nickel phosphate

A lithium-ion battery and cathode material technology, applied in battery electrodes, circuits, electrical components, etc., can solve problems such as rare secondary lithium-ion batteries, and achieve improved conductivity and active material utilization, uniform particle size distribution, The effect of improving cycle performance

Inactive Publication Date: 2013-10-02
HARBIN ENG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the above two reasons, although the LiNiPO 4 There are many studies on the structure of materials, but there are few studies on LiNiPO 4 Research report on the application of materials in secondary lithium-ion batteries

Method used

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  • In-situ carbon coating preparation method for secondary lithium ion battery cathode material lithium nickel phosphate

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Experimental program
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Effect test

Embodiment 1

[0025] (1) Will (NH 4 ) 3 PO 4 ·3H 2 O, NiSO 4 ·6H 2 O, LiOH·H 2 O was fully dissolved in benzyl alcohol aqueous solution (benzyl alcohol accounted for 50% by volume) according to the molar ratio of 1:1:3, and magnetically stirred for 30 minutes;

[0026] (2) Pour the fully stirred benzyl alcohol solution into a stainless steel reactor lined with polytetrafluoroethylene for hydrothermal reaction. The hydrothermal reaction temperature is 150°C and the hydrothermal time is 12 hours;

[0027] (3) Suction filter the product obtained by the hydrothermal reaction, and wash the impurities contained in it with distilled water and absolute ethanol;

[0028] (4) Put the cleaned material into a blast drying oven at 80°C to dry;

[0029] (5) Fully grind the dried powder, put it into a tube furnace, pretreat at 400°C for 2h in an argon atmosphere, and then calcinate at 750°C for 2h to obtain the final product;

[0030] (6) Preparation of electrode sheets and battery assembly: The e...

Embodiment 2

[0033] (1) Will (NH 4 ) 3 PO 4 ·3H 2 O, NiSO 4 ·6H2 O, LiOH·H 2 O, glucose is fully dissolved in distilled water according to the molar ratio of 1:1:3:0.5, and magnetically stirred for 30min;

[0034] (2) Pour the fully stirred benzyl alcohol solution into a stainless steel reactor lined with polytetrafluoroethylene for hydrothermal reaction. The hydrothermal reaction temperature is 150°C and the hydrothermal time is 12 hours;

[0035] (3) Suction filter the product obtained by the hydrothermal reaction, and wash the impurities contained in it with distilled water and absolute ethanol;

[0036] (4) Put the cleaned material into a blast drying oven at 80°C to dry;

[0037] (5) Fully grind the dried powder, put it into a tube furnace, pretreat at 400°C for 2h in an argon atmosphere, and then calcinate at 750°C for 2h to obtain the final product;

[0038] (6) Preparation of electrode sheets and battery assembly: The electrode paste is made of binder LA132, Ketjen black KB,...

Embodiment 3

[0041] (1) Will (NH 4 ) 3 PO 4 ·3H 2 O, NiSO 4 ·6H 2 O, LiOH·H 2 O. Glucose is fully dissolved in benzyl alcohol aqueous solution (benzyl alcohol accounts for 50% by volume) according to the molar ratio of 1:1:3:0.5, and magnetically stirred for 30 minutes;

[0042] (2) Pour the fully stirred benzyl alcohol solution into a stainless steel reactor lined with polytetrafluoroethylene for hydrothermal reaction. The hydrothermal reaction temperature is 180°C and the hydrothermal time is 12 hours;

[0043] (3) Suction filter the product obtained by the hydrothermal reaction, and wash the impurities contained in it with distilled water and absolute ethanol;

[0044] (4) Put the cleaned material into a blast drying oven at 80°C to dry;

[0045] (5) Fully grind the dried powder, put it into a tube furnace, pretreat at 400°C for 2h in an argon atmosphere, and then calcinate at 750°C for 2h to obtain the final product;

[0046] (6) Preparation of electrode sheets and battery asse...

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Abstract

The invention provides an in-situ carbon coating preparation method for a secondary lithium ion battery cathode material lithium nickel phosphate. The method includes:(1) dissolving a lithium source compound, a divalent nickel source compound, phosphate and a carbon source in a benzyl alcohol water solution; (2) carrying out a hydrothermal reaction at 100DEG C-200DEG C for 4h-10h; (3) performing pumping filtering, conducting washing with distilled water and absolute ethanol; (4) conducting drying at 50DEG C-100 DEG C; (5) fully grinding the dried powder, firstly carrying out a pretreatment, and then performing calcinations at high temperature so as to obtain the final product. The invention makes use of the in-situ carbon coating method to prepare near-spherical nanoscale LiNiPO4 particles, the specific surface area of active particles is increased, the electrochemical contact between active substances and a conductive agent is strengthened, the conductivity of the LiNiPO4 material is enhanced, and the charge and discharge performance of secondary lithium ion batteries is improved. Therefore, the lithium nickel phosphate can be taken as a potential secondary lithium ion battery cathode material.

Description

technical field [0001] The invention relates to a preparation method of a secondary lithium ion battery cathode material. Background technique [0002] LiMPO with olivine structure 4 (M = Fe, Co, and Ni) material is a promising Li-ion intercalation material that has attracted extensive attention. Compared with traditional metal oxide materials LiCoO 2 、LiCo x Ni y mn z o 2 (x+y+z=1), LiMn 2 o 4 Compared to LiMPO 4 PO in the material 4 3- The inductive effect of α increases the energy level of the redox couple in the cathode material, making the lattice structure more stable. This material also has the following characteristics: low cost, high safety, environmental friendliness and considerable specific capacity. [0003] Currently, LiFePO 4 Power batteries have been mass-produced in various countries and provide power for new electric buses and hybrid electric cars. with LiFePO 4 material compared to LiNiPO 4 The material has the following characteristics: 1)...

Claims

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Application Information

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IPC IPC(8): H01M4/583H01M4/1397
CPCY02E60/10
Inventor 曹殿学张莹王贵领
Owner HARBIN ENG UNIV
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