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Surface composite coated anode material, preparation method thereof and lithium ion battery

A technology for lithium ion batteries and positive electrode materials, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of positive electrode material structure damage, safety accidents, and high temperature cycle performance to be improved, and achieve excellent high temperature cycle performance and rate performance. excellent effect

Active Publication Date: 2013-03-06
QINGHAI TAIFENG XIANXING LITHIUM ENERGY TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Whether it is the high-voltage lithium-ion battery cathode material being developed or the commonly used lithium-ion battery cathode material, they face a common problem in the charged state: they are highly oxidizing to the electrolyte and easily react with the electrolyte. On the one hand, the structure of the positive electrode material itself will be destroyed, and on the other hand, it will also cause safety accidents.
Using aluminum phosphate to coat the positive electrode material can improve the rate performance of the positive electrode material, but the high temperature cycle performance needs to be improved

Method used

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  • Surface composite coated anode material, preparation method thereof and lithium ion battery
  • Surface composite coated anode material, preparation method thereof and lithium ion battery
  • Surface composite coated anode material, preparation method thereof and lithium ion battery

Examples

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Effect test

Embodiment 1

[0037] Weigh 2.09g Al(NO 3 ) 3 9H 2 O was dissolved in 20mL water; weighed 0.45g NaOH and 0.21g (NH 4 ) 2 HPO 4 , mixed, dissolved in 20mL of water; NaOH and (NH 4 ) 2 HPO 4 The resulting solution was slowly added dropwise to Al(NO 3 ) 3 9H 2In the O solution, control the pH at 4.5 to obtain a sol; weigh 200g of a layered lithium intercalation compound lithium cobaltate sample, add 120mL of water as a dispersion medium, and stir and disperse; slowly add the formed sol to the stirred and dispersed lithium cobaltate In the sample, react for 2 hours; stand still, filter, and dry the obtained filter cake; roast the dried material at 550°C for 5 hours to obtain Al 2 o 3 -AlPO 4 Composite coated lithium cobalt oxide cathode material, wherein the mass percentage of Al element and lithium cobalt oxide is 0.075%; 2 o 3 -AlPO 4 Al in composite layer 2 o 3 The mass ratio fraction that accounts for is 51.14%.

[0038] Al 2 o 3 -AlPO 4 Composite-coated lithium cobalt o...

Embodiment 2

[0041] Weigh 1.65g Al 2 (SO4) 3 Dissolve in 20mL water; weigh 0.55g KOH and 0.19g (NH 4 ) 2 HPO 4 , mixed, dissolved in 20mL of water; KOH and (NH 4 ) 2 HPO 4 The resulting solution was slowly added dropwise to the Al 2 (SO4) 3 In the solution, control the pH at 7.0 to obtain a sol; weigh 200g of a layered lithium intercalation compound lithium cobaltate sample, add 120mL of water as a dispersion medium, and stir and disperse; add the formed sol dropwise to the stirred and dispersed lithium cobaltate sample , reacted for 2 hours; stood still, filtered, and dried the obtained filter cake; roasted the dried material at 650°C for 5 hours to obtain Al 2 o 3 -AlPO 4 Composite-coated lithium cobalt oxide cathode material, wherein the mass percentage of Al element and lithium cobalt oxide is 0.065%, in Al 2 o 3 -AlPO 4 Al in composite layer 2 o 3 The mass ratio fraction that accounts for is 70%.

[0042] Al prepared by 2 o 3 -AlPO 4 The composite coated lithium cob...

Embodiment 3

[0047] Weigh 2.03g Al 2 (SO 4 ) 3 Dissolve in 20mL water; weigh 0.67g KOH and 0.45g K 2 HPO 4 , mixed, dissolved in 20mL of water; KOH and K 2 HPO 4 The resulting solution was slowly added dropwise to the Al 2 (SO 4 ) 3 In the solution, control the pH at 4.8 to obtain a sol; weigh 200g of layered lithium intercalation compound Li(Ni 0.5 co 0.2 mn 0.3 )O 2 For battery cathode material, add 120mL water as the dispersion medium, and stir and disperse; add the formed sol dropwise to the stirred and dispersed lithium cobalt oxide sample, and react for 3 hours; let stand, filter, and dry the obtained filter cake; dry The material was calcined at 800°C for 5h to obtain Al 2 o 3 -AlPO 4 Composite coated Li(Ni 0.5 co 0.2 mn 0.3 )O 2 Lithium-ion battery cathode material, in which Al element and lithium intercalation compound Li(Ni 0.5 co 0.2 mn 0.3 )O 2 The mass percentage is 0.080%, in Al 2 o 3 -AlPO 4 Al in composite layer 2 o 3 The mass ratio fraction that ...

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Abstract

The invention provides a surface composite coated lithium ion battery anode material, a preparation method thereof and a lithium ion battery. The anode material comprises a lithium intercalation compound basal body and an Al2O3-AlPO4 composite layer which is coated on the basal body. The mass ratio of Al elements to lithium intercalation compounds is 0.04-0.15 percent. The mass percent of Al2O3 in the composite layer is 10-90 percent. The preparation method comprises the following steps of: dissolving easily soluble aluminum salt in solvent to form solution A; dissolving easily soluble alkaline substances and easily soluble phosphate in solvent to form solution B; dispersing the lithium intercalation compounds in a dispersing medium to obtain a dispersion system M; enabling the solution B and the solution A to form sol substances, adding the sol substances into the dispersion system M and enabling sol particles to be evenly adsorbed on the surfaces of the lithium intercalation compounds; and finally conducting solid-liquid separation and subsequent treatment. By adopting the technical scheme, the defects of sole coating can be effectively overcome, and the lithium ion battery with excellent rate capability and high-temperature circulating performance can be prepared.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to a lithium ion battery positive electrode material with a surface composite coating, a preparation method thereof, and a lithium ion battery using the positive electrode material. Background technique [0002] As a new type of secondary battery, lithium-ion battery has the characteristics of high specific capacity, high voltage and good safety, and is widely used in portable electronic products. Commonly used cathode materials for lithium-ion batteries are LiCoO 2 、LiNiCoO 2 , LiNiCoMnO 2 and LiMn 2 o 4 Wait. At present, researchers in various countries are also developing high-voltage materials, such as LiNi 0.5 mn 1.5 o 4 、LiCoPO 4 Wait. With the continuous upgrading of electronic products, the market needs to continuously increase the volumetric energy density of the battery, so the commonly used lithium-ion battery cathode materials are grad...

Claims

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Application Information

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IPC IPC(8): H01M4/62H01M4/48H01M10/0525
CPCY02E60/122Y02E60/10
Inventor 徐世国张继泉王丹李淼周恒辉
Owner QINGHAI TAIFENG XIANXING LITHIUM ENERGY TECH CO LTD
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