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A kind of preparation method of cu/lif composite cathode material of lithium ion battery

A technology for composite cathode materials and lithium-ion batteries, which is applied in battery electrodes, secondary batteries, circuits, etc., can solve problems such as complex processes, difficulty in adapting to large-scale production, and high equipment requirements, and achieve simple preparation processes and avoid corrosive electrodes. The use of strong and highly toxic hydrofluoric acid, the effect of low sintering temperature

Active Publication Date: 2021-01-08
HUNAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Given CuF 2 Lithium-poor defects in cathode materials and preparation of CuF by high-energy ball milling and pulsed laser deposition 2 The existing equipment requirements are high, the process is complex, and it is difficult to adapt to large-scale production. The present invention provides a new method for preparing Cu / LiF composite positive electrodes.

Method used

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  • A kind of preparation method of cu/lif composite cathode material of lithium ion battery
  • A kind of preparation method of cu/lif composite cathode material of lithium ion battery
  • A kind of preparation method of cu/lif composite cathode material of lithium ion battery

Examples

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Effect test

Embodiment 1

[0027] The preparation method of Cu / LiF composite cathode material of the present invention, comprises the steps:

[0028] ⑴ 9.9884 grams of CuSO 4 ·5H 2 O, 5.6302 g Li 2 SO 4 ·H 2 O was dissolved in distilled water to prepare solution I, in which CuSO 4 The mass percent concentration is 30%.

[0029] ⑵Will 4.9640 grams (NH 4 ) 2 C 2 o 4 , 3.2595 g NH 4 F was dissolved in distilled water to prepare solution II, in which (NH 4 ) 2 C 2 o 4 The mass percentage concentration is 8%.

[0030] (3) Add solution I to solution II and carry out precipitation reaction at 50°C for 3 hours, then centrifuge and wash the suspension, and dry at 80°C to obtain a solid isolate;

[0031] (4) Sinter the solid isolate obtained in step (3) in an inert atmosphere furnace at 400° C. for 0.5 hour, and then cool to room temperature to obtain a Cu / LiF composite positive electrode material.

[0032] The samples of Example 1 were measured by a Brucker D8 Advance X-ray diffractometer. Its X...

Embodiment 2

[0035] ⑴ 6.8192 grams of CuCl 2 ·5H 2 O, 5.3161 g LiCl·H 2 O was dissolved in distilled water to prepare solution I, in which CuCl 2 The mass percentage concentration is 50%.

[0036] ⑵The 5.3600 grams of Na 2 C 2 o 4 , 3.2595 g NH 4 F was dissolved in distilled water to prepare solution II, in which Na 2 C 2 o 4 The mass percent concentration is 4%.

[0037] (3) Add solution I to solution II and carry out precipitation reaction at 80°C for 1 hour, then centrifuge and wash the suspension, and dry at 80°C to obtain a solid isolate;

[0038] (4) ball mill the solid isolate obtained in step (3) with an appropriate amount of acetylene black for 1 hour, then sinter in an inert atmosphere furnace at 350° C. for 2 hours, and then cool to room temperature to obtain a Cu / LiF composite positive electrode material with a carbon content of 5 wt%. .

[0039] The sample of Example 2 was measured by a Brucker D8 Advance X-ray diffractometer. The XRD pattern of the obtained produ...

Embodiment 3

[0041] ⑴ 7.5024 grams of Cu (NO 3 ) 2 , 5.7918 g LiNO 3 Dissolved in distilled water, prepared as solution I, in which Cu(NO 3 ) 2 The mass percentage concentration is 40%.

[0042] ⑵Will 4.9640 grams (NH 4 ) 2 C 2 o 4 , 3.1113 g NH 4 F was dissolved in distilled water to prepare solution II, in which (NH 4 ) 2 C 2 o 4 The mass percent concentration is 12%.

[0043] (3) Add solution I to solution II and carry out precipitation reaction at 60°C for 2 hours, then centrifuge and wash the suspension, and dry at 80°C to obtain a solid isolate;

[0044] (4) The solid isolate obtained in step (3) is ball-milled with an appropriate amount of conductive carbon black for 1 hour, then sintered in an inert atmosphere furnace at 600° C. for 0.5 hour, and then cooled to room temperature to obtain a Cu / LiF composite positive electrode with a carbon content of 10 wt%. Material.

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Abstract

The invention discloses a preparation method of a lithium ion battery Cu / LiF composite cathode material. The method comprises the following steps: firstly, dissolving soluble copper salt and lithium salt in distilled water to be prepared into a solution I and dissolving soluble oxalate and NH4F in distilled water to be prepared into a solution II; then, adding the solution I into the solution II to perform precipitation reaction and separating a suspension to obtain solid separated matter; finally, sintering the obtained solid separated matter in an inert atmosphere furnace to obtain a Cu / LiFcomposite cathode material. Compared with the prior art, the preparation method disclosed by the invention has the advantages of simple preparation technology, low sintering temperature and the like;furthermore, a process is easy to control, and the purity of an obtained product is high; the defect of poor lithium of a CuF2 cathode material is solved, use of hydrofluoric acid with strong corrosion and poison is avoided, and the defects of complex equipment, high energy consumption and the like of a high energy ball milling method and a pulsed laser deposition method are overcome.

Description

technical field [0001] The invention relates to a positive electrode material of a lithium ion battery, in particular to a preparation method of a Cu / LiF composite positive electrode material. Background technique [0002] Lithium-ion batteries with high energy density are one of the important technical directions for the development of new energy in the future. At present, the negative electrode materials of lithium-ion batteries have made great breakthroughs in silicon and alloy materials, and the reversible capacity is as high as 4200mAh·g. -1 . At present, commercialized lithium-ion batteries are mostly based on lithium deintercalation mechanism, generally using layered LiCoO 2 , spinel LiMn 2 o 4 and olivine LiFePO 4 Other lithium intercalation compounds are positive electrode materials. Since a 3d metal ion of these materials only exchanges one electron during the lithium deintercalation process, the theoretical mass specific capacity is low, such as LiCoO 2 , L...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/58H01M4/62H01M10/0525
CPCH01M4/362H01M4/582H01M4/62H01M10/0525Y02E60/10
Inventor 唐安平付洋洋陈崛东吴超郭畅郭育良徐国荣宋海申
Owner HUNAN UNIV OF SCI & TECH
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