Cathode active material for lithium ion secondary battery, its making method and lithium ion secondary battery including this cathode active material

A negative electrode active material, secondary battery technology, used in secondary batteries, electrode manufacturing, battery electrodes, etc.

Inactive Publication Date: 2008-05-28
吴乃立
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, so far there is still no technology that can successfully use silicon as the thick-film particle electrode configuration of traditional lithium-ion secondary batteries. The main reason is the large volume change of silicon during the charge / discharge cycle mentioned above.

Method used

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  • Cathode active material for lithium ion secondary battery, its making method and lithium ion secondary battery including this cathode active material
  • Cathode active material for lithium ion secondary battery, its making method and lithium ion secondary battery including this cathode active material
  • Cathode active material for lithium ion secondary battery, its making method and lithium ion secondary battery including this cathode active material

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Embodiment

[0031] Add high-purity elemental powder silicon (99%, -325 mesh, Aldrich Company) and nickel (5 μm, CERAC Company) to mechanical alloying to synthesize alloy powder, wherein the molar ratio of silicon and nickel is 1 : 2. Mechanical alloying was carried out using a planetary mill (Pulverisette P7, Fritsch company) and stainless steel ball mill jars and balls in an argon (Ar) atmosphere, where the weight ratio of balls to powder was 14:1, and 0.5 % by weight of stearic acid [CH 3 (CH 2 ) 16 COOH] was added as a lubricant. After milling at 400 rpm for 16 hours, an intermediate product containing nickel, silicon, and nickel silicide was formed. The product obtained by milling was placed in 0.5 M nitric acid aqueous solution for 1 hour to etch away the nickel. The amount of nickel dissolved in the nitric acid aqueous solution was measured with an inductively coupled plasma (ICP) spectrometer (Optima, model 3000XL). Finally, the powder was separated from the nitric acid aqueo...

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Abstract

The invention relates to a negative electrode active material which is used in lithium ion secondary batteries, in particular to the material which uses silicon as a main component. The negative electrode active material is used to improve the size stability of the negative of the lithium ion secondary batteries in charging / discharging cycles and reduce the loss of irreversible electric capacity. The material comprises porous particles. The porous particle is of a compound matter which is formed by the connection of primary particles of the silicon and metal silicide. The porous particle has 10 to 60 percent of the internal porosity and 10 to 5000 nanometers of inner-pores.

Description

technical field [0001] The invention relates to a negative electrode active material for a lithium ion secondary battery, in particular to a negative electrode active material with silicon as the main component. Background technique [0002] Graphite is a commonly used negative electrode active material for commercial lithium-ion secondary batteries because of its low cost, low and flat working pressure and excellent reversibility. However, graphite has the disadvantage of relatively low theoretical capacitance value, about 370mAh / g (or 830Ah / L). [0003] In the search for higher capacitance anode active materials, much effort has been focused on silicon-based materials. As the negative electrode active material of the lithium ion secondary battery, silicon has a theoretical capacitance value greater than 3000mAh / g. However, silicon has a large volume change (more than 300%) during the charge / discharge cycle, and silicon has poor electronic conductivity, so that its applic...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/02H01M4/36H01M4/04B22F9/00H01M10/40
CPCY02E60/122Y02E60/10
Inventor 吴乃立刘伟仁谢登存吴弘俊
Owner 吴乃立
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