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Multi-component composite negative electrode material, preparation method thereof and lithium ion battery

A negative electrode material, multi-component composite technology, applied in the direction of negative electrode, battery electrode, secondary battery, etc., can solve the problems of poor effect, achieve high first-time Coulombic efficiency, reduce the formation of SEI film, and increase the ion and electron transmission rate. Effect

Active Publication Date: 2020-09-18
BTR NEW MATERIAL GRP CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In the material prepared by this method, lithium titanate particles are dispersed inside the material, and nano-silicon is deposited on the surface of lithium titanate particles. The particles are single particles dispersed inside the material, there is no synergistic effect between the particles, and the skeleton structure it builds is less effective in alleviating the volume expansion of silicon particles

Method used

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  • Multi-component composite negative electrode material, preparation method thereof and lithium ion battery
  • Multi-component composite negative electrode material, preparation method thereof and lithium ion battery
  • Multi-component composite negative electrode material, preparation method thereof and lithium ion battery

Examples

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Effect test

Embodiment 1

[0074] In this embodiment, the multi-element composite negative electrode material is prepared according to the following method:

[0075] (1) Mechanically pulverize flake natural graphite to graphite particles with a median particle size of 10.0-30.0 μm, place it in a ball mill containing 0.01mm zirconia balls and ethylene glycol solvent, and perform ball milling to obtain the median Hollow graphite with a particle size of 1.0-15.0 μm.

[0076] (2) Disperse nano-silicon with a median particle size of 100nm and tetrabutyl titanate at a molar ratio of 4:1 in an ethanol solvent, and after ultrasonic stirring for 0.5h, slowly add the molar ratio of tetrabutyl titanate to the solution It is 1:4 deionized water, after continuing to stir for 20min, add lithium acetate and hollow graphite successively therein, control lithium acetate: tetrabutyl titanate: nano-silicon: the molar ratio of hollow graphite is 0.4:0.5:2: 2. Ultrasonic stirring for 0.5 hours to form a uniform suspension,...

Embodiment 2

[0083] In this embodiment, the multi-element composite negative electrode material is prepared according to the following method:

[0084] (1) Mechanically pulverize flake natural graphite to graphite particles with a median particle size of 10.0-30.0 μm, place it in a ball mill containing 0.01mm zirconia balls and ethylene glycol solvent, and perform ball milling to obtain the median Hollow graphite with a particle size of 1.0-15.0 μm;

[0085] (2) Disperse nano-silicon with a median particle size of 100nm and tetrabutyl titanate in a molar ratio of 4:1 in isopropanol solvent, stir ultrasonically for 0.5h, and slowly add tetrabutyl titanate dropwise into the solution Molar ratio is the deionized water of 1:4, after continuing to stir for 20min, add lithium hydroxide and hollow graphite successively wherein, control lithium hydroxide: tetrabutyl titanate: nano-silicon: the mol ratio of hollow graphite is 0.4: 0.5:2:2, ultrasonically stirred for 0.5h to form a uniform suspensi...

Embodiment 3

[0091] In this embodiment, the multi-element composite negative electrode material is prepared according to the following method:

[0092] (1) Mechanically pulverize flake natural graphite to graphite particles with a median particle size of 20.0-45.0 μm, place it in a ball mill containing 0.01 mm zirconia balls and ethylene glycol solvent, and perform ball milling to obtain the median Hollow graphite with a particle size of 5.0-20.0 μm.

[0093] (2) Disperse nano-silicon with a median particle size of 150nm and tetraisopropyl titanate in a molar ratio of 1:1 in ethylene glycol solvent, stir ultrasonically for 0.5h, and slowly add tetrabutyl titanate dropwise into the solution Deionized water with an ester molar ratio of 1:4, continue to stir for 20 minutes, and then add lithium hydroxide and hollowed graphite to it in turn, and control the molar ratio of lithium hydroxide: tetrabutyl titanate: nano-silicon: hollowed graphite to 0.4 :0.5:2:1.5, ultrasonically stirred for 0.5h...

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Abstract

The invention provides a multi-component composite negative electrode material, a preparation method thereof and a lithium ion battery. The multi-component composite negative electrode material provided by the invention comprises an inner core and a shell covering the surface of the inner core, the inner core comprises graphite and a composite component embedded in the graphite, and the compositecomponent comprises nano silicon, lithium titanate and a first non-graphite carbon material; the shell includes a second non-graphitic carbon material. The preparation method comprises the following steps: dispersing nano silicon and a titanium source in a solvent, mixing the nano silicon and titanium source with water, hydrolyzing the titanium source, adding a lithium source and graphite, and carrying out mixing, crushing and granulating to obtain a first precursor; calcining the first precursor to obtain a second precursor; and mixing the second precursor with a carbon source, and carrying out heating treatment to obtain the multi-component composite negative electrode material. The multi-component composite negative electrode material has relatively high specific capacity and initial coulombic efficiency, ultra-low volume expansion, and very excellent cycle performance and rate capability.

Description

technical field [0001] The invention belongs to the technical field of energy storage materials, and relates to a multi-element composite negative electrode material, a preparation method thereof and a lithium ion battery. Background technique [0002] Lithium-ion batteries have been widely used in portable electronic products and electric vehicles because of their advantages such as high working voltage, long cycle life, no memory effect, small self-discharge, and environmental friendliness. At present, commercial lithium-ion batteries mainly use graphite-based negative electrode materials, but its theoretical specific capacity is only 372mAh / g, which cannot meet the demand for high energy density of lithium-ion batteries in the future. As an anode material, silicon material has a high theoretical specific capacity (4200mA h / g) and a low delithiation potential platform, which is the most promising alternative to graphite as an ideal choice for a new generation of lithium ba...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/485H01M4/583H01M4/62H01M10/0525
CPCH01M4/366H01M4/362H01M4/583H01M4/386H01M4/485H01M4/625H01M10/0525H01M2004/027Y02E60/10H01M4/364H01M4/587H01M4/1393H01M4/1395H01M4/0471H01M4/0402H01M2004/021
Inventor 车宗洲何鹏任建国贺雪琴
Owner BTR NEW MATERIAL GRP CO LTD
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