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A cathode material -- SiC for a lithium ion battery and a lithium ion secondary battery using such material

A negative electrode material and secondary battery technology, applied in the field of new energy materials, can solve the problems of limited lithium-ion battery capacity, poor cycle stability, high volume change rate, etc., and achieve good application prospects, stable cycle performance, and good safety performance. Effect

Inactive Publication Date: 2015-01-21
HUNAN ZHENGYUAN ENERGY STORAGE MATERIALS & DEVICE INST +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the theoretical specific capacity of graphite is only 372mAh / g, and its safety performance is poor, which limits the capacity of lithium-ion batteries
The specific capacity of tin-based and silicon-based materials is very high, and the specific capacity of single crystal silicon can be as high as 4200mAh / g, but the high volume change rate of the material itself makes the cycle stability poor during the charge and discharge process

Method used

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  • A cathode material -- SiC for a lithium ion battery and a lithium ion secondary battery using such material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0011] Example 1 SiC, conductive carbon black, and PVDF were mixed in a mass ratio of 80:10:10, coated on a current collector and dried in vacuum at 120°C for 12 hours to make a positive electrode of a lithium battery. A button battery is assembled with a lithium metal sheet as the negative electrode, 1M LiPF6 as the electrolyte, and a polypropylene microporous membrane as the diaphragm. The electrochemical performance test of the lithium-ion secondary battery made of SiC negative electrode material was carried out, and the charging and discharging voltage setting range was 0.1V~2.0V. The electrochemical performance of this example product is shown in Table 1.

Embodiment 2

[0012] Example 2 SiC, acetylene black, and polyvinyl alcohol were mixed in a mass ratio of 90:5:5, coated on a current collector and dried in vacuum at 120°C for 12 hours to make a lithium battery negative electrode. A button battery is assembled with lithium iron phosphate as the positive electrode, 1M LiPF6 as the electrolyte, and a polypropylene microporous membrane as the diaphragm. The electrochemical performance test of the lithium-ion secondary battery made of SiC negative electrode material was carried out, and the charging and discharging voltage setting range was 0.1V~2.0V. The electrochemical performance of this example product is shown in Table 1.

Embodiment 3

[0013] Example 3 SiC, activated carbon fiber, and polyethylene were mixed in a mass ratio of 85:10:5, coated on a current collector and dried in vacuum at 120°C for 12 hours to make a lithium battery negative electrode. A button battery is assembled with lithium manganate as the positive electrode, 1M LiPF6 as the electrolyte, and polypropylene microporous membrane as the separator. The electrochemical performance test of the lithium-ion secondary battery made of SiC negative electrode material was carried out, and the charging and discharging voltage setting range was 0.1V~2.0V. The electrochemical performance of this example product is shown in Table 1.

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Abstract

The invention relates to a new-type cathode material -- SiC used in a lithium ion secondary battery. The lithium ion secondary battery, which is manufactured from a material containing such active substance SiC and a lithium plate, is characterized in that the lithium ion secondary battery has a charging voltage platform of 0.6V and a discharging voltage platform of 0.4V respectively, and a theoretical specific capacity of up to 2680 mAh / g, and has a good charge-discharge cycle performance and environmentally-friendly and pollution-free characterizations. The SiC is a new-type, high capacity and high safety lithium ion battery cathode material with promising applications.

Description

technical field [0001] The invention relates to a novel lithium ion battery negative electrode material and a lithium ion secondary battery using the negative electrode material, belonging to the field of new energy materials. Background technique [0002] Lithium-ion batteries have been widely used in portable electronic devices such as notebook computers, digital cameras, and mobile phones since the 1990s. At the same time, it is also widely used in energy storage devices. With the gradual commercialization of lithium-ion batteries, anode materials, as the key materials of lithium-ion batteries, play an important role in the energy, safety, and cycle life of lithium-ion batteries. [0003] At present, widely used anode materials for lithium-ion batteries include graphite-like carbon materials, lithium-titanium oxides, tin-based materials, silicon-based materials, and transition metal oxides. However, the theoretical specific capacity of graphite is only 372mAh / g, and its...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/58H01M4/136H01M10/0525
CPCH01M4/136H01M4/58H01M10/0525Y02E60/10
Inventor 李荐刘雯雯周宏明
Owner HUNAN ZHENGYUAN ENERGY STORAGE MATERIALS & DEVICE INST
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