Lithium ion batteries cathode material and preparation method thereof

A lithium-ion battery, cathode material technology, applied in battery electrodes, circuits, electrical components, etc., can solve the problem of the safety performance of cathode materials not being effectively improved, achieve anti-overcharge performance and thermal stability improvement, avoid decomposition, The effect of improving the discharge capacity

Inactive Publication Date: 2015-07-01
BEIJING EASPRING MATERIAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Coating metal oxides such as Al on the surface of the positive electrode material 2 o 3 Although the electrochemical performance of the positive electrode material can be improved, the safety performance of the positive electrode material has not been effectively improved.

Method used

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  • Lithium ion batteries cathode material and preparation method thereof
  • Lithium ion batteries cathode material and preparation method thereof
  • Lithium ion batteries cathode material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] A lithium battery positive electrode material provided in this embodiment includes composite oxide particles and a coating layer, and the composite oxide particles are lithium cobaltate LiCoO 2 , the particle size is 15um, and the cladding layer structure is LiMnSiO 4 , accounting for 2% by mass of the entire positive electrode material, and the thickness of the coating layer is 0.2um.

[0040] The preparation method is as follows:

[0041] Dissolve manganese sulfate in water to obtain a 0.1mol / L salt solution, add 1.00g of tetraethyl orthosilicate to 10mL of the above manganese sulfate solution, stir for 10h, then add 30g of lithium cobaltate LiCoO 2 Add it in, then fully stir for 2 hours to form a suspension, dry at 100°C for 15 hours, and burn at 500°C for 5 hours to obtain LiMnSiO 4 Coated LiCoO 2 cathode materials for lithium batteries.

Embodiment 2

[0043] A lithium battery positive electrode material provided in this embodiment includes composite oxide particles and a coating layer, and the composite oxide particles are doped lithium cobaltate LiCo 0.8 Ni 0.2 o 2 , the particle size is 8um, and the cladding structure is LiMn 0.9 Fe 0.1 SiO 4 , accounting for 0.1% by mass of the entire positive electrode material, and the thickness of the coating layer is 0.01um.

[0044] The preparation method is as follows:

[0045] Manganese chloride and ferric chloride were formulated into a 1.0mol / L mixed salt solution according to the molar ratio of 0.9:0.1, and 0.50 g of tetraethylorthosilicate was added to 20 ml of the above mixed salt solution, and after stirring for 12 hours, 35 g Li co 0.8 Ni 0.2 o 2Add it, and then fully stir for 2 hours to form a suspension, dry at 200°C for 10 hours, and sinter at 1000°C for 1 hour to obtain LiMn 0.9 Fe 0.1 SiO 4 Coated Li Co 0.8 Ni 0.2 o 2 cathode materials for lithium batter...

Embodiment 3

[0047] This embodiment provides a lithium battery positive electrode material, which includes composite oxide particles and a coating layer, and the composite oxide particles are doped lithium cobaltate LiCo 0.95 Mg 0.05 o 2 , the particle size is 20um, and the cladding structure is LiMn 0.9 Mg 0.1 SiO 4 , accounting for 10% by mass of the entire positive electrode material, and the thickness of the cladding layer is 1um.

[0048] The preparation method is as follows:

[0049] Manganese acetate and magnesium chloride were formulated into a 2 mol / L mixed salt solution at a molar ratio of 0.95:0.05, and 1.6 g of methyl orthosilicate was added to 20 mL of the above mixed salt solution, and after stirring for 12 hours, 30 g of LiCo 0.95 Mg 0.05 o 2 Add it into it, and then fully stir for 4 hours to form a suspension, dry at 50°C for 20 hours, and sinter at 300°C for 3 hours to obtain LiMn 0.9 Mg 0.1 SiO 4 Coated LiCo 0.95 Mg 0.05 o 2 cathode materials for lithium batt...

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Abstract

The invention discloses a lithium ion batteries cathode material and a preparation method thereof, and more specifically relates to the lithium ion batteries cathode material coated by orthosilicate and the preparation method thereof. A coating layer comprises the chemical composition of Li1+aMnbMcSiO4(M=Co, Ni, Fe, Mg, Al, Ti, Zr, and a is greater than or equal to -0.1 and less than or equal to 0.1, b is greater than 0 and less than or equal to 1.0, c is greater than or equal to 0 and less than or equal to 1.0). The cathode material has good overcharge resistance performance and thermostability. The preparation method is characterized in that orthosilicate and a salting liquid containing Mn(and M) are mixed to form sol, then a cathode material core is added, an orthosilicate coating layer containing Mn(and M) is formed on at least part of the surface of the cathode material core, and the lithium ion batteries cathode material can be obtained after heat treatment.

Description

technical field [0001] The invention belongs to the technical field of lithium ion battery cathode materials, and in particular relates to a lithium ion battery cathode material coated with orthosilicate and a preparation method thereof. Background technique [0002] With the rapid development of portable electronic products, power tools and electric vehicles, the market demand for high-power, high-energy-density batteries is increasing. Lithium-ion batteries have the advantages of high working voltage, high energy density, long cycle life, no memory effect and environmental friendliness, and have very broad development prospects. [0003] LiCoO is widely used as a cathode material for lithium-ion batteries. 2 , but LiCoO 2 The price is expensive, the actual specific capacity is 120~140mAh / g, and the anti-overcharge performance is poor, and the specific capacity decreases rapidly at a higher charging voltage. On the one hand, this is due to the side reaction between the p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/131H01M4/1391H01M4/525
CPCH01M4/131H01M4/1391H01M4/48H01M4/62Y02E60/10
Inventor 王汝娜陈彦彬刘亚飞
Owner BEIJING EASPRING MATERIAL TECH CO LTD
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