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Lithium ion battery anode material and preparation method thereof

A technology for lithium-ion batteries and cathode materials, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of poor chemical performance, low durability and cycle performance of lithium batteries, achieve excellent electronic conductivity, and improve charging. Potential, good compatibility effect

Active Publication Date: 2014-03-26
HUAWEI TECH CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In view of this, the first aspect of the embodiment of the present invention provides a lithium-ion battery positive electrode material to solve the problem that the positive electrode active material is prone to react with the electrolyte, and the lithium battery has poor electrochemical performance under high voltage, and has low durability and cycle performance issues

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  • Lithium ion battery anode material and preparation method thereof
  • Lithium ion battery anode material and preparation method thereof
  • Lithium ion battery anode material and preparation method thereof

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preparation example Construction

[0049] In a second aspect, an embodiment of the present invention provides a method for preparing the above-mentioned cathode material for a lithium-ion battery, comprising the following steps:

[0050] (1) Stir and disperse the coated raw material lithium source, N source, M source and the positive electrode active material to be coated in deionized water to make a precursor slurry;

[0051] The lithium source of the coating raw material is: one or more of lithium hydroxide, lithium carbonate, lithium nitrate, lithium chloride and lithium acetate;

[0052] The N source and M source are one or more of oxides, nitrates, chlorides and hydroxides containing N and M respectively;

[0053] The N is one or more of La, Al, Sr, Sc, Cr, Ba, Fe, Mo and Y; the M is one or more of Ta, Nb and V;

[0054] (2) roasting the obtained precursor slurry to obtain the lithium-ion battery cathode material coated with a fast ion conductor layer;

[0055] The composition of the fast ion conductor l...

Embodiment 1

[0071] A preparation method for lithium ion battery cathode material, comprising the following steps:

[0072] (1) Weigh lithium hydroxide 8g, lanthanum oxide 18.6g, tantalum oxide 8.5g, nickel cobalt lithium manganate (LiNi 0.5 co 0.2 mn 0.3 o 2 ) 2000g, the four are placed in a 10L stirring tank with 1500g deionized water and stirred evenly to form a precursor slurry;

[0073] (2) Calcining the above precursor slurry obtained, the roasting system is: heating up to 600 °C at 8 °C / min, holding the temperature for 8 hours, cooling with the furnace, and obtaining a fast ion conductor coated with a layer thickness of about 60 nm on the surface layer of lithium nickel cobalt manganese oxide (LiNi 0.5 co 0.2 mn 0.3 o 2 ), the molecular expression of its fast ion conductor is Li 5 La 3 Ta 2 o 12 ;

[0074] (3) Add the nickel cobalt lithium manganese oxide material coated with the fast ion conductor layer to 1.6 L of dilute hydrochloric acid with a concentration of 0.2 mo...

Embodiment 2

[0076] A preparation method for lithium ion battery cathode material, comprising the following steps:

[0077] (1) Weigh 10g of lithium hydroxide, 13g of lanthanum oxide, 8.8g of tantalum oxide, 5.3g of niobium oxide, 8.4g of strontium nitrate, lithium nickel cobalt manganate (LiNi 0.5 co 0.2 mn 0.3 o 2 ) 3000g, the four are placed in a 10L stirring tank with 2000g deionized water and stirred evenly to form a precursor slurry;

[0078] (2) Calcining the above precursor slurry obtained, the roasting system is: heating up to 600 °C at 8 °C / min, holding the temperature for 8 hours, cooling with the furnace, and obtaining a fast ion conductor coated with a layer thickness of about 100 nm on the surface layer of lithium nickel cobalt manganese oxide (LiNi 0.5 co 0.2 mn 0.3 o 2 ), the molecular expression of its fast ion conductor is Li 6 SrLa 2 CaNbO 12 ;

[0079] (3) Add the nickel cobalt lithium manganate material coated with the fast ion conductor layer to 1.8 L of di...

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Abstract

The embodiment of the invention relates to a lithium ion battery anode material. The lithium ion battery anode material comprises an anode active material and a fast ionic conductor layer and a conductive polymer layer which are coated on the surface of the anode active material, wherein the fast ion conductor layer comprises a fast ion conductor Li<5+x+y>N<3-x>M<2-y>O12 having a garnet structure, wherein N is one or more of La, Al, Sr, Sc, Cr, Ba, Fe and Mo; M is one or more of Ta, Nb And V, x is more than or equal to 0 and less than or equal to 2, and y is more than or equal to 0 and less than or equal to 1. The lithium ion battery anode material not only has relatively high charging potential so as to greatly promote the capacity of a lithium ion battery, but also is capable of effectively improving the cycle stability and prolonging the service life of the lithium ion battery, and realizing the rapid charging and discharging. The embodiment of the invention also provides a preparation method of the lithium ion battery anode material.

Description

technical field [0001] The invention relates to the field of lithium ion batteries, in particular to a lithium ion battery cathode material and a preparation method thereof. Background technique [0002] Among many battery products, lithium-ion batteries have attracted people's close attention due to their advantages such as light weight, small size, high working voltage, high energy density, high output power, high charging efficiency, no memory effect, and long cycle life. Mobile phones, notebook computers and other fields have been widely used. [0003] In recent years, due to the continuous improvement of the performance of mobile devices and communication devices, higher requirements have been placed on the energy density, cycle life, and high-current output and input performance of lithium-ion batteries. The actual specific capacity of the material is only about one-half of the theoretical specific capacity. This is mainly because the performance of the positive elect...

Claims

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Application Information

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IPC IPC(8): H01M4/62H01M4/131H01M4/1391
CPCY02E60/122H01M4/366H01M4/624H01M10/0525Y02E60/10
Inventor 叶海林张光辉
Owner HUAWEI TECH CO LTD
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