Porous silicon based composite anode material, preparation method and lithium ion battery

A negative electrode material, porous silicon-based technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of poor reversible capacity and cycle performance

Active Publication Date: 2017-09-01
宁波富理电池材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] At present, the research on porosity is mostly based on silicon nanowires. Although it has e...

Method used

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  • Porous silicon based composite anode material, preparation method and lithium ion battery
  • Porous silicon based composite anode material, preparation method and lithium ion battery
  • Porous silicon based composite anode material, preparation method and lithium ion battery

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preparation example Construction

[0040] The present invention provides a method for preparing the porous silicon-based composite negative electrode material described in the above technical solution, comprising the following steps:

[0041] Mixing silicon-containing nanoparticles with a solvent and ball milling to obtain a slurry;

[0042]mixing the slurry with metal particles, carbon sources and additives, spray drying and sintering to obtain a porous silicon-based composite negative electrode material;

[0043] The metal particles include one or more of Sn, Cu and Mn.

[0044] In the invention, the silicon-containing nano particles are mixed with a solvent and ball milled to obtain a slurry. In the present invention, the silicon-containing nanoparticles preferably include silicon, SiO 2 and SiO x One or more of them; the SiO x The value of x is preferably 0

Embodiment 1

[0063] Put the silicon powder and 50mL aqueous solution under an inert atmosphere, 2000 rpm high-energy ball mill for 8 hours, and then transfer it to a sand mill for 4 hours at 1000 rpm ball mill; the obtained 2.5g of silicon with a particle size of 5-100nm Slurry, the mass ratio of silicon powder, glucose and Sn is 10:40:3, the mass ratio of silicon powder and sodium chloride is 1:1, after mixing, ultrasonically disperse for 5 hours, spray dry for granulation, atomizer speed 20000 In order to achieve the purpose of uniform particles, the temperature of the drying air inlet is 220°C, and the temperature of the air outlet is 110°C. The obtained spherical material is then placed in a resistance furnace for sintering at 800°C for 5 hours in an inert atmosphere, and the obtained spherical material is centrifugally washed with water. , dried, and sieved to obtain a porous spherical nanometer silicon-based negative electrode material for lithium ion batteries, that is, a porous sili...

Embodiment 2

[0067] Silicon powder and 50mL aqueous solution were milled by high-energy ball at 1800 rpm for 8 hours under an inert atmosphere, and then transferred to a sand mill for ball milling at 1500 rpm for 4 hours; Slurry, the mass ratio of silicon powder, phenolic resin and Sn is 70:90:10, silicon powder and (NH 4 ) 2 CO 3 The mass ratio of (ammonium carbonate) is 1:10, mixed ultrasonically for 5 hours, spray-dried for granulation, the atomizer speed is 20000 rpm to achieve uniform particles, the drying air inlet temperature is 220 °C, and the air outlet temperature It is 110°C. The obtained spherical material is then placed in a resistance furnace and sintered at 800°C for 10 hours in an inert atmosphere. The obtained spherical material is washed with centrifugal water, dried, and sieved to obtain a porous spherical nano-silicon-copper negative electrode material for lithium-ion batteries, that is, porous silicon-based Composite anode materials.

[0068] Electrochemical perfor...

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Abstract

The invention provides a porous silicon based composite anode material, a preparation method and a lithium ion battery. The porous material includes: a porous amorphous carbon matrix; silicon-containing nano particles and metal particles loaded on the porous amorphous carbon matrix, wherein the metal particles include one or more of Sn, Cu and Mn. The porous structure in the porous material is conducive to rapid exchange of lithium ions on a contact surface, and has good cycling stability; the metal particles and porous amorphous carbon serve as a support skeleton of the composite porous anode material, enable the formation of a stable SEI film on the anode composite material surface, can give full play to the advantage of high lithium storage capacity of silicon materials and make the electrode stably release reversible capacity. Therefore, the nano silicon based composite porous material has high reversible capacity and excellent cycling performance.

Description

technical field [0001] The invention relates to the technical field of negative electrode materials for lithium ion batteries, in particular to a porous silicon-based composite negative electrode material, a preparation method thereof and a lithium ion battery. Background technique [0002] Lithium-ion battery is a secondary battery (rechargeable battery) that mainly relies on the movement of lithium ions between the positive and negative electrodes to work. During the charging and discharging process, Li + Intercalation and deintercalation back and forth between two electrodes: when charged, Li + It is deintercalated from the positive electrode, inserted into the negative electrode through the electrolyte, and the negative electrode is in a lithium-rich state; the opposite is true during discharge. Batteries generally use materials containing lithium elements as electrodes, which are representatives of modern high-performance batteries. The basic composition of a lithium...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/62H01M10/0525
CPCH01M4/364H01M4/626H01M10/0525Y02E60/10
Inventor 季晶晶夏永高刘兆平
Owner 宁波富理电池材料科技有限公司
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