A kind of si/tio2 composite material with multi-sphere packing structure and its preparation method

A composite material and dense stacking technology, which is applied in the negative electrode material of lithium ion secondary battery, Si/TiO2 composite material with multi-sphere stacked structure for lithium ion battery and its preparation field, can solve unfavorable industrial amplification, escape, and material sintering Poor performance and other problems, to achieve the effect of convenient operation, improved durability, and improved tap density

Active Publication Date: 2018-12-04
SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

CN1855586A discloses a negative electrode material for a secondary lithium ion battery, which includes silicon particles and a titanium oxide coating layer coated on the surface of the silicon particles, but the pulsed chemical vapor deposition method in this patent is not conducive to industrial amplification, while sol-gel The sinterability of the material prepared by this method is poor, and a lot of gas and organic matter will escape during the drying process, and shrinkage will occur, which is also not conducive to industrial scale-up.

Method used

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  • A kind of si/tio2 composite material with multi-sphere packing structure and its preparation method
  • A kind of si/tio2 composite material with multi-sphere packing structure and its preparation method
  • A kind of si/tio2 composite material with multi-sphere packing structure and its preparation method

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preparation example Construction

[0036] In one example, the preparation method of the present invention comprises the following steps:

[0037] (1) silicon powder (such as nano-silicon, micro-silicon) is pretreated;

[0038] (2) Disperse the treated silicon powder in a certain solvent;

[0039] (3) Add additives, adjust the pH, add titanium source and trace distilled water, and mix evenly;

[0040] (4) the mixed solution is transferred to the reactor to carry out solvothermal reaction;

[0041] (5) The resulting product is centrifugally washed after solvothermal, and dried for subsequent use;

[0042] (6) Transfer to an inert atmosphere furnace for high temperature treatment.

[0043] The pretreatment in step (1) is used to activate the surface of the silicon powder. The pretreatment method includes an appropriate hydrogen peroxide solution, a mixed solution of sulfuric acid and hydrogen peroxide (volume ratio 2-3:1), and other methods capable of activating nano Solution treatment of silicon powder surfac...

Embodiment 1

[0060] Preparation H 2 SO 4 :H 2 o 2 = 2:1 solution, soak nano-silicon in it, put it in an oven at 85°C for 30 minutes, take it out and centrifuge, wash with deionized water several times, and put it in an oven at 80°C to dry. Place 0.1 g of nano-silicon powder obtained from the treatment in 50 mL of ethanol and sonicate for 30 min, add CTAB dropwise, add tetrabutyl titanate dropwise according to the ratio (molar ratio) of silicon: titanium dioxide = 1:0.35, and simultaneously press tetrabutyl titanate Add deionized water to the ratio of ester hydrolysis, solvent heating at 150°C for 24h; centrifuge and wash the obtained precipitate, and dry it in an oven at 80°C. Transfer the obtained powder to an atmosphere furnace at 500°C for 3 hours in an air atmosphere. After the furnace cools down to room temperature, take out the powder and grind it for use. The obtained powder material, SuperP and sodium alginate were made into a slurry at a mass ratio of 3:1:1, coated on a copper...

Embodiment 2

[0062] Add tetrabutyl titanate dropwise according to the ratio of silicon: titanium dioxide = 1:0.7, and add deionized water according to the hydrolysis ratio of tetrabutyl titanate, and other conditions are the same as above. see test results image 3 .

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Abstract

The invention relates to a multi-sphere stack-structured Si / TiO2 composite material and a preparation method therefor. The Si / TiO2 composite material comprises Si spheres, and a plurality of TiO2 spheres densely stacked around the Si spheres; and the grain diameter of the Si spheres is larger than that of the TiO2 spheres. In the multi-sphere stack-structured Si / TiO2 composite negative electrode material, silicon active granules are protected by a titanium dioxide nano-particles dense stacked layer; the internal stress generated from volume expansion is fully relieved by taking advantage of the dense stacking characteristic of the Si / TiO2 composite negative electrode material, so that the electrochemical performance and the stacking density of the silicon negative electrode material can be improved, the circulation reversibility of the electrode and the utilization rate of active materials are effectively improved, and the cycle life of the battery is prolonged.

Description

technical field [0001] The invention relates to lithium-ion secondary battery negative electrode materials, belongs to the field of chemical power sources, and particularly relates to a Si / TiO with multi-sphere stacking structure for lithium-ion batteries 2 Composite materials and methods for their preparation. Background technique [0002] With the development of electric vehicles and smart grids, the energy field is developing towards power batteries, so higher requirements are placed on the energy density and power density of lithium batteries. Among the available negative electrode materials, Si can form Li 22 Si 5 Lithium storage products have a very high lithium storage specific capacity (4200mAh g -1 ), is a class of anode materials for lithium storage with great development prospects. However, there is a serious volume effect (>300%) in the process of electrochemically deintercalating lithium, resulting in a decrease in the electrochemical stability of the elec...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/48H01M4/139H01M10/0525
CPCH01M4/139H01M4/362H01M4/386H01M4/483H01M10/0525Y02E60/10
Inventor 刘宇张娜贺诗阳贺健赵宽张书明
Owner SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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