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Preparing method for nickel tin-carbon-silicon electrode material

A silicon electrode, nickel-tin technology, applied in the direction of battery electrodes, circuits, electrical components, etc., can solve the problems of active material falling off, volume expansion, shrinkage, etc., and achieve the effect of convenient operation, industrial production, and simple process

Inactive Publication Date: 2016-02-24
CHINA JILIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the volume of silicon / carbon expands and shrinks during charging and discharging, which still causes the active material to fall off from the electrode sheet.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] The composition design of a kind of nickel tin-carbon-silicon electrode material is:

[0024] Silicon oxide (MCM-41, specific surface area > 700m 2 / g), 0.05mol; magnesium, 0.12mol; aniline, 0.15mol; nickel nitrate, 0.015mol; stannous chloride, 0.006mol;

[0025] A preparation method of nickel tin-carbon-silicon electrode material: comprising the following steps:

[0026] 1) Weigh a certain mass of silica MCM-41 and mechanically mix metal magnesium, and then thermally reduce at 700°C for 4 hours in an inert atmosphere;

[0027] 2) The product of step 1) is immersed in excess hydrochloric acid, reacted for 10 hours, filtered, washed and dried to obtain porous silicon;

[0028] 3) Mix the product of step 2) and the polymer precursor in an alcohol solution of hydrochloric acid, add a surfactant cetyltrimethylammonium bromide and stir for 5 hours: wherein: the mass fraction of HCl in hydrochloric acid is 5%; The volume ratio of hydrochloric acid to alcohol is 0.4;

[00...

Embodiment 2

[0034] The composition design of a kind of nickel tin-carbon-silicon electrode material is:

[0035] Silicon oxide (SBA-15, specific surface area > 700m 2 / g), 0.05mol; magnesium, 0.15mol; pyrrole, 0.2mol; nickel acetate, 0.02mol; stannous chloride, 0.02mol;

[0036] A preparation method of nickel tin-carbon-silicon electrode material: comprising the following steps:

[0037] 1) Weigh a certain mass of silica SBA-15 and mechanically mix metal magnesium, and then thermally reduce at 660°C for 6 hours in an inert atmosphere;

[0038] 2) Immerse the product of step 1) in excess hydrochloric acid, react for 5 hours, filter, wash and dry to obtain porous silicon;

[0039] 3) Weigh a certain mass of step 2) the product and pyrrole are mixed in a tetrahydrofuran solution of hydrochloric acid, add the surfactant polyvinylpyrrolidone and stir evenly for 3 hours: wherein: the mass fraction of HCl in hydrochloric acid is 3.5%; the volume ratio of hydrochloric acid to tetrahydrofuran is ...

Embodiment 3

[0045] The composition design of a kind of nickel tin-carbon-silicon electrode material is:

[0046] Silicon oxide (nanosphere, specific surface area > 700m 2 / g), 0.05mol; magnesium, 0.1mol; thiophene, 0.1mol; nickelous chloride, 0.005mol; tin acetate, 0.01mol;

[0047] Silicon oxide (nano powder, specific surface area > 700m 2 / g), 0.05mol; magnesium, 0.2mol; pyrrole, 0.25mol; nickel acetate, 0.05mol; tin acetate, 0.016mol;

[0048] The preparation method of a nickel-tin-carbon-silicon electrode material is the same as that of Example 1.

[0049] Preparation and performance test of the negative electrode; nickel-tin-carbon-silicon electrode material is used as the positive electrode, metal lithium is used as the negative electrode, 1mol / LLiPF6 is dissolved in EC:DMC:EMC (1:1:1)+5%FEC as the electrolyte, CELGARD2400 Assemble the coin cell for the separator as the separator. The Land battery test system is used for constant current charge and discharge tests. The charging...

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Abstract

The invention relates to a preparing method for a nickel tin-carbon-silicon electrode material. According to the material, silicon oxide with the high specific surface area is used as a raw material, mechanically mixed with magnesium, reduced in a high temperature thermal mode, treated in an acid mode, and coated with a conducting polymer, nickel oxide and tin oxide are deposited, and tabletting and high-temperature thermal reducing are carried out, so that the nickel tin-carbon-silicon electrode material is obtained; the specific surface area of silicon oxide is larger than 700 m<2> / g, and silicon oxide is one of silicon oxide nanometer powder, silicon oxide nanospheres, silicon oxide SBA-15, silicon oxide MCM-41 and silicon oxide KIT-6; the conducting polymer is one of polyaniline, polypyrrole, polythiophene and polyacetylene; the molar ratio of silicon oxide to magnesium is 1:(2-4), the molar ratio of silicon oxide to the conducting polymer precursor is 1:(1-5), the molar ratio of nickel oxide to the conducting polymer precursor is 1:(1-20), and the molar ratio of nickel oxide to tin oxide is 3:(1-8). The composite material has the advantages of being stable in structure and good in conductivity, having high specific capacity and excellent cycle performance when being used in a negative pole of a lithium battery, and having a good application prospect in the field of the batteries.

Description

technical field [0001] The invention relates to a preparation method of an electrode material, in particular to a preparation method of a nickel-tin-carbon-silicon electrode material. Background technique [0002] The energy issue is a key issue related to the sustainable development of the world, and seeking and developing alternative secondary energy is an important national policy of all countries in the world. Lithium-ion battery is a new generation of green high-energy battery that has been developed rapidly in the past ten years. It has the advantages of high voltage, high specific energy, long cycle period, and low environmental pollution. It has become the first choice for secondary energy. Lithium-ion batteries are widely used in mobile phones, notebook computers, portable electric tools and electric vehicles, etc., so they have broad application prospects. [0003] Compared with other components of lithium-ion batteries, the development of cathode and anode materi...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/38H01M10/0525
CPCH01M4/364H01M4/381H01M4/386H01M10/0525Y02E60/10
Inventor 姚炉锡范美强常珈菘宋璐涛陈哲
Owner CHINA JILIANG UNIV
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