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Tungsten-doped boride-coated lithium battery anode material and preparation method thereof

A cathode material, tungsten doping technology, applied in battery electrodes, circuits, electrical components, etc., can solve the problem of unsatisfactory rate performance of nickel cobalt lithium manganate ternary material, achieve fast ion transmission properties, shorten transmission distance , the effect of improving safety performance

Active Publication Date: 2018-04-10
GEM (HUBEI) NEW ENERGY MATERIALS CO LTD
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  • Abstract
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Problems solved by technology

[0003] In view of the above problems, the object of the present invention is to provide a tungsten-doped boride-coated lithium battery positive electrode material and its preparation method, aiming at solving the technical problem that the rate performance of the existing nickel-cobalt lithium manganate ternary material is not very ideal

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  • Tungsten-doped boride-coated lithium battery anode material and preparation method thereof
  • Tungsten-doped boride-coated lithium battery anode material and preparation method thereof
  • Tungsten-doped boride-coated lithium battery anode material and preparation method thereof

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preparation example Construction

[0019] The preparation method of the tungsten-doped boride-coated lithium battery cathode material provided by the present invention comprises the following steps:

[0020] 1) Dissolve the tungsten source in water, spray it into the mixed raw material of the ternary precursor and the lithium source, stir for a period of time and evaporate to dryness to obtain a dry material.

[0021] The tungsten source mentioned here is ammonium metatungstate, the lithium source is lithium hydroxide or lithium carbonate, and the amount of tungsten element added is 500-7000ppm, that is, the tungsten element accounts for 5 / 10,000 to 70 / 10,000 of the ternary precursor by mass ratio. In the process of evaporating to dryness to obtain dry materials, the heating temperature is 50-100° C., and the heating time is 0.5-3 hours.

[0022] 2) Put the above dry material into a sagger and roast for a period of time to obtain a tungsten-doped ternary positive electrode material.

[0023] Here, the calcinat...

Embodiment 1

[0029] Mix and stir 150g of ternary nickel-cobalt-manganese precursor and 71.8g of lithium hydroxide evenly, add 1.4g of ammonium metatungstate into 10mL of water, spray it into the above mixed raw material, stir at 90°C for 0.5h to form a dry material, and transfer it to a horse Heat treatment at 800°C for 12 hours in a Furnace, and after cooling, a tungsten-doped ternary positive electrode material was obtained. Add 0.75g of magnesium boride to the above-mentioned tungsten-doped positive electrode material, stir evenly, and sinter at 600°C for 6 hours. After cooling, a tungsten-doped ternary material was obtained. The nickel-cobalt-manganese ternary cathode material coated with magnesium boride and its electron microscope photos are as follows: figure 1 shown.

Embodiment 2

[0031] Mix and stir 150g of nickel-cobalt-manganese ternary precursor and 63.25g of lithium carbonate evenly, add 0.5g of ammonium metatungstate into 10mL of water, spray it into the above mixed raw materials, stir at 80°C for 1 hour to form a dry material, and transfer it to a muffle furnace Heat treatment at 900°C for 10 hours, and after cooling to obtain a tungsten-doped ternary positive electrode material, add 0.5g of magnesium boride to the above-mentioned tungsten-doped positive electrode material, stir evenly and sinter at 700°C for 5 hours, and obtain tungsten-doped, Magnesium boride-coated nickel-cobalt-manganese ternary cathode material.

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Abstract

The invention is applicable to the technical field of lithium batteries and provides a tungsten-doped boride-coated lithium battery anode material and a preparation method thereof. Firstly, tungsten source is dissolved in water, sprayed onto a mixed material of a ternary precursor and lithium source and then stirred to obtain a dried material; the dried material is placed and baked in a saggar toobtain a tungsten-doped ternary anode material; finally, metal boride is added to the tungsten-doped ternary anode material, stirred uniformly and sintered at a certain temperature to obtain the tungsten-doped boride-coated lithium battery anode material. According to the tungsten-doped boride-coated lithium battery anode material, the synergistic effect between tungsten doping and the metal boride takes full advantage of the tungsten doping and the metal boride, the tungsten doping can significantly inhibit grain growth and shorten the transmission distance of Li+, MgB2 as a superconductor has fast ion transmission properties, and the tungsten doping and the metal boride improve rate capability of the tungsten-doped boride-coated lithium battery anode material. Meanwhile, the boride coating can inhibit the reaction between the surface of an electrode material and electrolyte, thereby improving the safety performance and cycle stability of the tungsten-doped boride-coated lithium battery anode material.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to a tungsten-doped boride-coated lithium battery cathode material and a preparation method thereof. Background technique [0002] Compared with other battery systems, lithium-ion batteries have the advantages of high energy density, good cycle performance and no memory effect. As an important energy storage device, lithium-ion batteries have been widely used in portable electronic devices, electric tools and electric vehicles, etc. field. With the rapid development of new energy vehicles, higher requirements are put forward for lithium-ion batteries that provide energy, especially the requirements for power performance and cycle performance are more stringent. Nickel-cobalt-manganese ternary lithium-ion battery cathode materials are widely used in portable electronic devices, electric tools, and electric vehicles due to their high energy density and relat...

Claims

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Application Information

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IPC IPC(8): H01M4/58
CPCH01M4/58Y02E60/10
Inventor 徐世国周晓燕惠科石任正田张明龙李新章
Owner GEM (HUBEI) NEW ENERGY MATERIALS CO LTD
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