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Anode active material of lithium ion battery and preparation method thereof

A lithium-ion battery and anode activity technology, which is applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of lack of space for anode active material particles, affecting the service life of lithium-ion batteries, and falling off of anode active materials. Chemical properties, slowing volume expansion, reducing the effect of damage

Active Publication Date: 2015-10-14
NINGDE AMPEREX TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these improvements cannot fundamentally change the volume change caused by the expansion of the anode active material particles, and there is no space for volume expansion inside the anode active material particles, which affects the service life of lithium-ion batteries
[0005] In view of this, it is necessary to provide a new type of lithium-ion battery anode active material to effectively improve the problems of anode active material falling off and anode sheet deformation due to large volume changes during charge and discharge cycles.

Method used

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  • Anode active material of lithium ion battery and preparation method thereof
  • Anode active material of lithium ion battery and preparation method thereof
  • Anode active material of lithium ion battery and preparation method thereof

Examples

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Embodiment 1

[0039] Si and Al are smelted with an electric arc in an inert atmosphere at a molar ratio of 10%: 90%. After 4 repeated smelting, the composition of the alloy is guaranteed to be uniform; 2 o 3 Covering, using an electromagnetic induction furnace to heat and melt, the degree of superheat is 300K; then, cool down and solidify, after 5 heating-cooling cycles, after the degree of supercooling reaches 200K, the supercooled Si-Al alloy melt is quickly blown with inert gas To achieve rapid solidification on a high-speed rotating copper roller with a line speed of 30m / s. Since the component Al belongs to a low-melting point metal, it is easy to gasify, and forms a gas nucleus under the interaction of internal and external gases, resulting in self-aeration. At the same time, the alloy melt is sprayed onto the high-speed rotating copper roller surface, which is strongly sheared by the roller surface. Force impact easily forms hollow Si-Al alloy particles. Under these conditions, the ...

Embodiment 2

[0043] Si and Sn are smelted with an electric arc in an inert atmosphere at a molar ratio of 50%:50%, and the composition of the alloy is guaranteed to be uniform after 10 times of repeated smelting; the smelted Si-Sn alloy is purified with anhydrous glass (70%B 2 o 3 +20%Na 2 B 4 o 7 +10%Na 2 SiO 3 ) covering, using an electromagnetic induction furnace to heat and melt, and the degree of superheat is 200K; then, cool down and solidify, and after 6 heating-cooling cycles, after the degree of supercooling reaches 200K, the supercooled Si-Sn alloy melt is rapidly cooled by inert gas Blow onto a high-speed rotating copper roll with a line speed of 40m / s to achieve rapid solidification. Since the component Sn is a low-melting point metal, it is easy to gasify, and forms gas nuclei under the interaction of internal and external gases, resulting in self-aeration. At the same time, the alloy melt is sprayed onto the high-speed rotating copper roller surface, which is strongly sh...

Embodiment 3

[0047] Si, Al and Sn are smelted by electric arc in an inert atmosphere at a molar ratio of 40%: 30%: 30%. After 7 times of repeated smelting, the composition of the alloy is guaranteed to be uniform. The smelted Si-Al-Sn alloy is purified with anhydrous glass (70%B 2 o 3 +20%Na 2 B 4 o 7 +10%Al 2 o 3 ) cover, using an electromagnetic induction furnace to heat and melt, the degree of superheat is 300K; then, cool down and solidify, after 4 heating-cooling cycles, after the degree of supercooling reaches 100K, use an inert gas to melt the supercooled Si-Al-Sn alloy The body is quickly blown onto a high-speed rotating copper roller at a line speed of 45m / s to achieve rapid solidification. Since the components Al and Sn are both low-melting point metals, they are easy to gasify and form gas nuclei under the interaction of internal and external gases, resulting in self-aeration. At the same time, the alloy melt is sprayed onto the high-speed rotating copper roller surface, w...

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Abstract

The invention discloses an anode active material of lithium ion batteries. The anode active material includes silicone alloy particles, wherein the interior of the silicone alloy particles is in a hollow honeycomb-like structure and the outer layer of the silicone alloy particles is coated with an amorphous carbon layer. The anode active material is in the structure that the interior is in the hollow honeycomb-like structure while the outer layer is coated with the amorphous carbon layer, so that not only is volume expansion during charging and discharging process alleviated through the pores in the honeycomb-like structure, but also the relative expansion of the particles can be reduced through the hollow honeycomb-like structure, so that damage on SEI films on the surface of the particle is reduced, and the anode active material can improve electrochemical performances of the lithium ion batteries and prolongs the service life of the lithium ion batteries. In addition, the invention also discloses a preparation method of the anode active material of the lithium ion batteries, and a lithium ion battery anode piece and a lithium ion battery manufactured with the anode active material.

Description

technical field [0001] The invention belongs to the field of lithium-ion batteries, and more specifically, the invention relates to a high-capacity lithium-ion battery anode active material and a preparation method thereof. Background technique [0002] At present, the anode active material of commercialized lithium-ion batteries is mainly graphite. However, graphite has limited mass specific capacity and very little room for volume specific capacity improvement, which cannot meet the needs of high-capacity and small-volume electronic devices. [0003] So far, through extensive research on metal anodes, it has been found that the most promising materials for lithium-ion battery anodes are silicon and tin, which allow a maximum lithium intercalation of about four times that of graphite, for example, Li 4.4 Si and Li 4.4 Sn, its theoretical gram capacity can be as high as 4200mA.h / g and 996mA.h / g respectively. Especially silicon, has a very high volume specific capacity (the...

Claims

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Application Information

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IPC IPC(8): H01M4/38H01M4/62H01M4/134H01M10/0525
CPCY02E60/10
Inventor 黄起森钟开富
Owner NINGDE AMPEREX TECH
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