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Preparation method of spinel-type LiMn2O4 cathode material coated by cobalt-aluminum composite metal oxide

A spinel type, composite metal technology, applied in battery electrodes, structural parts, electrical components, etc., can solve problems such as poor coating effect, and achieve the effect of good electrochemical cycle stability

Active Publication Date: 2010-09-29
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, our further research also found that the coating method in the literature (1) is not suitable for LiMn with larger grains. 2 o 4 Has a good coating effect, but for LiMn with fine grains 2 o 4 Accumulated secondary particles, poor coating effect

Method used

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  • Preparation method of spinel-type LiMn2O4 cathode material coated by cobalt-aluminum composite metal oxide
  • Preparation method of spinel-type LiMn2O4 cathode material coated by cobalt-aluminum composite metal oxide
  • Preparation method of spinel-type LiMn2O4 cathode material coated by cobalt-aluminum composite metal oxide

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Weigh 4.44g Co(NO 3 ) 2 ·6H 2 O and 2.07g Al(NO 3 ) 3 9H 2 O was dissolved in 100mL deionized water to obtain 0.15mol / L Co(NO 3 ) 2 and 0.055mol / L Al(NO 3 ) 3 mixed salt solution; weigh 1.87g LiOH·H 2 O was dissolved in 100mL deionized water to obtain a 0.45mol / L LiOH solution; 30g LiMn 2 o 4 Add it into 100mL deionized water, stir mechanically to obtain a suspension; add 50mL Co(NO 3 ) 2 and Al(NO 3 ) 3 mixed salt solution, and LiOH solution was added dropwise to keep the pH of the suspension at 10.5; after crystallization for 1 hour, filter to obtain cobalt-aluminum hydrotalcite-coated LiMn 2 o 4 Precursor. The remaining 50mL Co(NO 3 ) 2 and Al(NO 3 ) 3 The mixed salt solution and the remaining LiOH solution were added to the colloid mill with a rotation speed of 3500 rpm and reacted for 3 minutes to obtain a cobalt-aluminum hydrotalcite suspension; the cobalt-aluminum hydrotalcite prepared above was coated with LiMn 2 o 4 The precursor was added...

Embodiment 2

[0029] Weigh 11.88g Co(NO 3 ) 2 ·6H 2 O and 7.65gAl(NO 3 ) 3 9H 2 O was dissolved in 60mL deionized water to obtain 0.68mol / L Co(NO 3 ) 2 and 0.34mol / L Al(NO 3 ) 3 mixed salt solution; weigh 5.45g LiOH·H 2 O was dissolved in 100mL deionized water to obtain a 1.3mol / L LiOH solution; 200g LiMn 2 o 4 Add it into 100mL deionized water, stir mechanically to obtain a suspension; add 30mL Co(NO 3 ) 2 and Al(NO 3 ) 3 mixed salt solution, and LiOH solution was added dropwise to keep the pH value of the suspension at 9.0; after crystallization for 0.5 hours, filter to obtain cobalt-aluminum hydrotalcite-coated LiMn 2 o 4 Precursor. The remaining 30mL Co(NO 3 ) 2 and Al(NO 3 ) 3 The mixed salt solution and the remaining LiOH solution were added to the colloid mill with a rotation speed of 3000 rpm and reacted for 5 minutes to obtain a cobalt-aluminum hydrotalcite suspension; the cobalt-aluminum hydrotalcite prepared above was coated with LiMn 2 o 4 The precursor was...

Embodiment 3

[0032] Weigh 5.93g Co(NO 3 ) 2 ·6H 2 O and 2.75g Al(NO 3 ) 3 9H 2 O was dissolved in 50mL deionized water to obtain 0.41mol / L Co(NO 3 ) 2 and 0.15mol / L Al(NO 3 ) 3 mixed salt solution; weigh 2.50g LiOH·H 2 O was dissolved in 50mL deionized water to obtain a 1.2mol / L LiOH solution; 60g LiMn2 o 4 Added into 50mL deionized water, mechanically stirred to obtain a suspension; dropwise added 20mL Co(NO 3 ) 2 and Al(NO 3 ) 3 mixed salt solution, and LiOH solution was added dropwise to keep the pH of the suspension at 12.0; after crystallization for 3 hours, filter to obtain cobalt-aluminum hydrotalcite-coated LiMn 2 o 4 Precursor. The remaining 30mL Co(NO 3 ) 2 and Al(NO 3 ) 3 The mixed salt solution and the remaining LiOH solution were added to the colloid mill with a rotation speed of 4000 rpm and reacted for 1 minute to obtain a cobalt-aluminum hydrotalcite suspension; the cobalt-aluminum hydrotalcite prepared above was coated with LiMn 2 o 4 The precursor is ...

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Abstract

The invention relates to a preparation method of a spinel-type LiMn2O4 cathode material coated by a cobalt-aluminum composite metal oxide, belonging to the technical field of electrode materials of a lithium ion battery. The preparation method comprises the following steps of: simultaneously dripping a cobalt-aluminum mixed salt solution and an LiOH solution to an LiMn2O4 suspension to obtain an LiMn2O4 precursor coated by cobalt-aluminum houghite; simultaneously adding cobalt-aluminum mixed salt solution and the LiOH solution to a colloid mill to obtain a cobalt-aluminum houghite suspension; adding the prepared LiMn2O4 precursor coated by the cobalt-aluminum houghite to the cobalt-aluminum houghite suspension; and crystallizing, filtering, drying and roasting to obtain an LiMn2O4 cathode material coated by the cobalt-aluminum composite metal oxide. The invention has the advantages that not only larger LiMn2O4 crystal grains are evenly coated, secondary grains formed by piling fine LiMn2O4 crystal grains can also be evenly coated so that the coated LiMn2O4 cathode material has better electrochemical cyclical stability.

Description

technical field [0001] The invention belongs to the technical field of lithium-ion battery electrode material preparation, and in particular provides a spinel-type LiMn coated with a cobalt-aluminum composite metal oxide. 2 o 4 Preparation method of cathode material. Background technique [0002] Spinel LiMn 2 o 4 It has the advantages of abundant raw materials, low toxicity, low cost and easy preparation, and is regarded as one of the most promising cathode materials for lithium-ion batteries. But LiMn 2 o 4 The poor electrochemical cycle performance, especially the high temperature cycle performance, restricts its development. LiMn 2 o 4 The main reasons for capacity fading are the dissolution of Mn, the Jahn-Teller effect, and the corrosion of cathode materials by HF. [0003] For LiMn 2 o 4 Due to the problem of cycle stability, people have carried out a lot of modification research on it, and the modification methods mainly include bulk phase doping and surfa...

Claims

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Application Information

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IPC IPC(8): H01M4/1391H01M4/505
CPCY02E60/122Y02E60/10
Inventor 杨文胜汤展峰邱天
Owner BEIJING UNIV OF CHEM TECH
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