Secondary battery material

A technology of carbon materials and negative electrode materials, applied in the field of secondary battery materials, can solve problems such as limiting the maximum capacity of lithium-ion batteries

Inactive Publication Date: 2009-07-29
FARASIS ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0018] In summary, so far, in practical use, no method has been developed to enable high-capacity rechargeable battery active materials to undergo large volume changes during cycling, thus limiting the capacity maximization of Li-ion batteries.

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0066] Expanded graphite-silicon composites with added pre-intercalated graphite

[0067] Expanded graphite-silicon composites were prepared using pre-expanded graphite by a conventional solid-state method. Silicon powder (Si, Aldrich, <30 μm) and carbon pitch powder (CP) were pre-mixed for 12 hours with specific weight ratios, respectively 88% Si and 12% CP, and 92% Si and 8% CP (Wheaton Modular Cell Production Roller Apparatus, Model III).

[0068] The above mixture was further divided into two groups and mixed with expanded graphite (EG, Asbury) in the following weight ratios, 10% EG and 3% EG (each relative to 100% by weight of Si-CP mixture). These four final Si-CP-EG mixtures (see Table 1 for details of samples 1-4) were held for 1 hour, i.e., (88% Si-12% CP) 3% EG, (88% Si -12% CP) 10% EG, (92% Si-8% CP) 3% EG, and (92% Si-8% CP) 10% EG. This step is called one-step firing.

[0069] The above calcined material was passed through a 53-90 μm sieve (Octagon 200 Test Si...

Embodiment 2

[0071] Expanded graphite silicon composites with added pre-expanded graphite

[0072] The expanded graphite-silicon composite material using pre-expanded graphite was prepared by a conventional solid-state method. Silicon powder (Si, Aldrich, <30 μm) and carbon pitch powder (CP) were premixed for 12 hours at specific weight percentages, 88% Si and 12% CP, and 92% Si and 8% CP, respectively (Wheaton Modular Cell Production Roller Apparatus, Model III).

[0073] Each of the above premixed Si-CPs was subjected to the first firing in Ar gas under the condition that the heating rate was increased from room temperature to 400 °C at a rate of 2 °C / min and kept for 1 h, and then cooled to room temperature. The preheated mixture of each Si-CP mixture was divided into two groups and then mixed with expanded graphite (EG) at the same weight percent of EG as the one-step fired sample in Example 1. These four Si-CP-EG mixtures (see Table 1 for details of samples 5-8) were subjected to fi...

Embodiment 3

[0078] Expanded graphite-silicon composites with added pre-intercalated graphite

[0079] Expanded graphite silicon composites were prepared using intercalated graphite by the same method as the solid phase method described in Example 1.

[0080] Silicon powder (Si, Alfa Aesar, 0.05–5 μm), pre-intercalated graphite (IG, Asbury) and carbon pitch powder (CP) were mixed for 12 hours at specific weight percentages, namely 92% Si, 8% CP and 10% IG, wherein the total weight of Si and CP is 100% (Wheaton Modular Cell Production Roller Apparatus, Model III). Then, the above-mentioned mixed mixture was divided into three groups, and preheated respectively under the condition that the heating rate was increased from room temperature to 300, 350, and 400° C. (respectively marked as sample 9, sample 10) at a rate of 4° C. / min. and sample 11), then cooled to room temperature. Then, the preheated mixture was subjected to a final calcination under Ar (CM Furnace 1218) gas from room tempera...

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Abstract

Embodiments of the invention relate to materials used in secondary batteries and the method for manufacturing the same. To address the problems of the prior art, an object of the present invention is to provide a negative electrode material for a non-aqueous Li-ion cell comprising active component particles capable of reversibly intercalating or alloying with lithium ions with a carbon coating layer containing an electronically conductive, elastic, carbon material capable of reversibly expanding and contracting to maintain electrical contact between the particles within an electrode matrix as the material is cycled electrochemically. Accordingly, several objects and advantages of embodiments of the invention include improved cycle life of high capacity active materials suitable for use in secondary batteries and the high capacity, long life cells.

Description

technical field [0001] The invention relates to a material for a secondary battery and a preparation method of the material. Background technique [0002] The development of low cost, safer, higher energy and power density rechargeable batteries is critical to the commercialization of new technologies that meet the needs of a wide range of markets within the automotive industry, the telecommunications industry, and the military of. Commercially, lithium-ion based rechargeable battery technology is able to provide the highest energy density available today, but has disadvantages in terms of cost, energy and power requirements in new applications, and cannot meet the needs of electric vehicles (EV / HEV's), Internet cellular phones, and other advanced portable power equipment needs. To address the limitations of current Li-ion systems, a great deal of research has focused on the development of alternative cathode and anode Li-intercalation materials (LiCoO 2 and graphitic car...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M10/36H01M4/04
CPCY02E60/122H01M10/052H01M4/625H01M4/366H01M4/38H01M4/386H01M4/387Y02E60/10
Inventor K·D·开普勒王瑀刘宏建
Owner FARASIS ENERGY
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