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Silicon-tin nano material as well as preparation method and application thereof

A nanomaterial, silicon-tin technology, applied in the field of material science, can solve the problems of difficult commercialization, many process variables, and high experimental costs, and achieve specific capacity advantages, improved cycle stability, and high repeatability.

Inactive Publication Date: 2022-08-02
NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the above-mentioned materials are all prepared through multi-step operations, the experimental cost is high, the process variables are many, the commercialization is difficult, and the cost is high.

Method used

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  • Silicon-tin nano material as well as preparation method and application thereof
  • Silicon-tin nano material as well as preparation method and application thereof
  • Silicon-tin nano material as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] This embodiment provides a preparation method of nano-silicon tin dioxide composite electrode material, wherein the preparation method includes the following specific steps:

[0047] Weigh 500 mg of nano-silicon particles (with a particle size of 50 to 100 nm) and 250 mg of anhydrous stannous chloride, and put them into a mixer for mixing. After the mixing is uniform and complete, it is put into a mortar for grinding; the mixed material is obtained;

[0048] After grinding until there is no graininess, in an inert atmosphere (argon, flow rate 150sccm), put it into a tube furnace for high temperature melting. Calcination conditions: keep at 300℃ for 2h;

[0049] The melted mixed material was put into a muffle furnace for calcination, and the calcination conditions were as follows: heat preservation at 300° C. for 2 h to obtain the sample to be tested.

[0050] Electrode preparation process: First, the sample to be tested is used as the active material, and the conducti...

Embodiment 2

[0058] The difference between this example and Example 1 is that in Example 2, the mass ratio of nano-silicon to anhydrous stannous chloride is 1:1. The rest of the preparation method and steps are the same as in Example 1, and the nano-silicon and tin dioxide composite negative electrode material is obtained, which is marked as N-Si@SnO 2 -1, made of material N-Si@SnO 2 -1 Prepare electrode materials for testing.

Embodiment 3

[0060] The difference between this example and Example 1 is that in Example 3, the mass ratio of nano-silicon to anhydrous stannous chloride is 3:1. The rest of the preparation method and steps are the same as in Example 1, and the micro-silicon and tin dioxide composite negative electrode material is obtained, which is marked as N-Si@SnO 2 -3, made of material N-Si@SnO 2 -3 Prepare electrode materials for testing.

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Abstract

The invention provides a silicon-tin nano material as well as a preparation method and application thereof. Comprising silicon particles and tin dioxide particles loaded on the surfaces of the silicon particles, the silicon particles comprise nano silicon and / or micron silicon; and the particle size of the silicon-tin nano material is 1-2 microns. The silicon serves as an inner core, the stannic oxide serves as a coating layer, the stannic oxide is a good conductive material, the specific capacity of the stannic oxide is as high as 782mAh / g, the lithium insertion potential is low, and lithium dendrites are not easy to form when the stannic oxide participates in an electrode reaction. In the cycle process of a battery, tin dioxide on the surface reacts with lithium in a system to become LixSn, and a formed lithium tin interface can better maintain the structural stability, reduce side reactions and reduce the thickness of an SEI film, so that the cycle performance of the composite material is effectively improved. And batch production can be realized, and industrial application is facilitated. Compared with pure silicon, the lithium ion battery prepared from the negative electrode material obtained by the method has excellent electrochemical properties such as high first efficiency, high specific capacity, good cycle performance and the like.

Description

technical field [0001] The invention relates to the field of material science, in particular to a silicon-tin nanometer material and a preparation method and application thereof. Background technique [0002] Lithium-ion batteries are widely used in portable electronic devices, electric vehicles and other fields due to their high energy density, long cycle life, and environmental friendliness. Among the many lithium-ion battery components, the negative electrode material is one of the main "murderers" to ensure the further improvement of the energy density and cycle stability of the lithium-ion battery and to dominate the cost of the battery. At present, the commercial anode materials for lithium-ion batteries are mainly graphite materials. Graphite is a cheap and stable anode material for batteries, and is currently the most widely commercialized anode material. However, the theoretical capacity of graphite is only 372mAh g -1 , the capacity of commercial graphite has rea...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/38H01M4/48H01M4/62B82Y30/00B82Y40/00
CPCH01M4/628H01M4/48H01M4/386H01M4/366B82Y30/00B82Y40/00Y02E60/10
Inventor 吴倩段浩杰朱琳徐宏强张羽婷何海勇
Owner NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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