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Three-layer core-shell structure positive electrode material, preparation method thereof and lithium ion battery

A technology for lithium-ion batteries and positive electrode materials, applied in battery electrodes, secondary batteries, structural parts, etc., can solve problems such as low capacity retention rate, fast decay of battery discharge capacity, unfavorable charge and discharge process, etc., to improve ion conductivity , the effect of reducing the contact area

Active Publication Date: 2018-09-28
SOUNDON NEW ENERGY TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, since alumina is an ion / electron insulator, the coating of alumina on the surface of the ternary positive electrode material has a certain hindering effect on the transmission of lithium ions, which is not conducive to the charge and discharge process at high rates. Under the high rate, the discharge capacity of the battery decays faster and the capacity retention rate is low

Method used

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  • Three-layer core-shell structure positive electrode material, preparation method thereof and lithium ion battery
  • Three-layer core-shell structure positive electrode material, preparation method thereof and lithium ion battery
  • Three-layer core-shell structure positive electrode material, preparation method thereof and lithium ion battery

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preparation example Construction

[0058] According to the above thinking, the preparation method of the three-layer core-shell structure cathode material of the present invention can be designed as the following experimental operation steps:

[0059] Step S1: Preparation of the precursor of the ternary positive electrode material: Weigh a certain amount of soluble Ni, Co, Mn salt, add it to the alcohol solution, and then add a certain amount of ammonium bicarbonate solution dropwise to the weak alkaline environment of the solution. Then put it in a reaction kettle for solvothermal reaction at 150-180° C. for 5-20 hours, and then filter and wash to obtain a ternary cathode material precursor.

[0060] Preferably, the soluble Ni salt is any one of nickel nitrate, nickel sulfate, and nickel chloride; preferably, the soluble Co salt is any one of cobalt nitrate, cobalt sulfate, and cobalt chloride; preferably, the soluble Mn salt It is any one of manganese nitrate, manganese sulfate and manganese chloride. Prefer...

Embodiment 1

[0077] In the three-layer core-shell composite positive electrode material of the present embodiment, the inner core is LiNi 0.6 co 0.2 mn 0.2 o 2 , the shell includes the interlayer Al 2 o 3 and outer Li 1.3 Al 0.3 Ti 1.7 (PO 4 ) 3 , where LiNi 0.6 co 0.2 mn 0.2 o 2 with Al 2 o 3 and Li 1.3 Al 0.3 Ti 1.7 (PO 4 ) 3 The mass ratio of is 50:1:1, and the preparation method of its core-shell structure comprises the following steps:

[0078] S1: Nickel cobalt lithium manganese oxide LiNi 0.6 co 0.2 mn 0.2 o 2 Preparation of precursors:

[0079] 109.620g nickel nitrate Ni(NO 3 ) 2 , 58.211g cobalt nitrate Co(NO 3 ) 2 ·6H 2 O, 35.790g manganese nitrate Mn(NO 3 ) 2 Add it to 700ml of butanol, and then add 1mol / L ammonium bicarbonate solution dropwise thereto until the pH of the solution is 10-12. Then place it in a polytetrafluoroethylene reactor for solvothermal reaction at 150° C. for 12 hours, and then filter and wash to obtain a positive electrode m...

Embodiment 2

[0085] In the three-layer core-shell composite positive electrode material of the present embodiment, the inner core is LiNi 0.6 co 0.2 mn 0.2 o 2 , the shell includes the interlayer Al 2 o 3 and outer Li 1.3 Al 0.3 Ti 1.7 (PO 4 ) 3 , where LiNi 0.6 co 0.2 mn 0.2 o 2 with Al 2 o 3 and Li 1.3 Al 0.3 Ti 1.7 (PO 4 ) 3 The mass ratio of is 80:1:1, and the preparation method of its core-shell structure comprises the following steps:

[0086] S1: Nickel cobalt lithium manganese oxide LiNi 0.6 co 0.2 mn 0.2 o 2 Precursor preparation: 109.620g nickel nitrate Ni(NO 3 ) 2 , 58.211g cobalt nitrate Co(NO 3 ) 2 ·6H 2 O, 35.790g manganese nitrate Mn(NO 3 ) 2 Add it to 700ml of isopropanol, and then add 1mol / L ammonium bicarbonate solution dropwise thereto until the pH of the solution is 10-12. Then place it in a polytetrafluoroethylene reactor for solvothermal reaction at 150° C. for 12 hours, and then filter and wash to obtain a positive electrode material pr...

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Abstract

The invention relates to a three-layer core-shell structure positive electrode material. The three-layer core-shell structure positive electrode material comprises a three-layer structure, namely, a ternary positive electrode material inner core, an aluminum oxide layer and a rapid ion conductor layer, wherein the aluminum oxide layer wraps the ternary positive electrode material inner core, and the rapid ion conductor layer wraps the aluminum oxide layer. The invention also comprises a preparation method of the three-layer core-shell structure positive electrode material. Since the rapid ionconductor wrapping an outer layer of the three-layer core-shell structure positive electrode material has super strong ionic conductivity, the integral ionic conductivity of the Al2O3-coated positiveelectrode material can be improved, the electric energy loss is reduced, and the cycle property of a battery is improved; moreover, the aluminum oxide layer and the ternary positive electrode materialinner core form a Li-Al-Co-O co-melting body by high-temperature calcination during the preparation process, the ionic conductivity of the material can be further improved, and the electrical conductivity and the microstructure stability of the composite material are improved; and by the three-layer core-shell structure, the corrosion of an electrolyte to the ternary positive electrode material inner core can be reduced, and the battery safety is improved.

Description

technical field [0001] The invention relates to battery cathode materials and a preparation method, as well as lithium ion batteries containing the cathode materials. Background technique [0002] Lithium-ion batteries have the characteristics of high energy density, long cycle life, no memory effect, and no pollution to the environment. They have been widely used in portable electronic devices and power vehicles. Therefore, lithium-ion batteries and their related materials have become a hot research topic at present. At present, the most widely used cathode materials for commercial lithium-ion batteries are lithium cobaltate, lithium manganate, lithium iron phosphate, layered nickel-cobalt-manganese ternary materials, nickel-cobalt-aluminum ternary materials, etc. Lithium cobalt oxide was the first to realize industrial production, but due to the high price of cobalt resources, the cost of materials is high and it has a certain impact on the environment. Although the lith...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/505H01M4/525H01M4/485H01M4/62H01M10/0525
CPCH01M4/366H01M4/485H01M4/505H01M4/525H01M4/62H01M4/628H01M10/0525Y02E60/10
Inventor 靳岩娄忠良
Owner SOUNDON NEW ENERGY TECH CO LTD
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