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Negative electrode active material for nonaqueous electrolyte secondary batteries and method for producing same

一种负极活性物质、非水电解质的技术，应用在非水电解质二次电池领域，能够解决无法充分发挥特性等问题，达到不可逆容量小、电极崩坏缓和、良好循环性的效果

Active Publication Date: 2016-08-10
SHIN ETSU CHEM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, even these methods are still not fully featured for practical use

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  • Negative electrode active material for nonaqueous electrolyte secondary batteries and method for producing same
  • Negative electrode active material for nonaqueous electrolyte secondary batteries and method for producing same
  • Negative electrode active material for nonaqueous electrolyte secondary batteries and method for producing same

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no. 1 Embodiment approach

[0091] First, a first embodiment of the present invention will be described.

[0092] The negative electrode active material for the non-aqueous electrolyte secondary battery of the first embodiment of the present invention is composed of the element composition formula Met 1 -Si-O-C-H said. Met in the element composition formula 1 It is one or a mixture of alkali metal elements. This negative electrode active material contains a silicate composed of a silicon-based inorganic compound and an alkali metal, and microparticles composed of silicon, silicon alloy, or silicon oxide (hereinafter also simply referred to as "silicon-based particles") are dispersed in the silicate. The alkali metal element is preferably Li or Na. Preferably, the silicate further contains Group 3 to Group 13 metals. The Group 3 to Group 13 metal is more preferably a first transition metal or a second transition metal. In the negative electrode active material of the present invention, furthermore, c...

no. 2 Embodiment approach

[0123] Next, a second embodiment of the present invention will be described. Descriptions of the same items as in the first embodiment are omitted.

[0124] The negative electrode active material for the non-aqueous electrolyte secondary battery of the 2nd embodiment of the present invention is by element composition formula Met 2 -Si-O-C-H said. Met in the element composition formula 2 It is one or a mixture of alkaline earth metal elements. This negative electrode active material contains a silicate composed of a silicon-based inorganic compound and the alkaline earth metal. The alkaline earth metal element used here is preferably Mg or Ca. In addition, in the negative electrode active material of the present invention, it is preferable that the silicate further contains Group 3 to Group 13 metals. More preferably, the Group 3 to Group 13 metal is a first transition metal or a second transition metal. In the negative electrode active material of the present invention, ...

Embodiment 1-1

[0153] 10 g of polycrystalline metal silicon particles with an average particle diameter of 0.2 μm and 150 g of methyl vinyl siloxane having a viscosity of 60,000 cp represented by the following chemical formula (1) were charged into a 1 L container of a twin-shaft planetary mixer, And 10g of lithium carbonate, kneading for 1 hour with a rotation speed of 30rpm. Add 0.8 g of Shin-Etsu Chemical Co., Ltd. containing 80% by mass of 2,5-dimethyl-2,5 bis(t-butylperoxy)-hexane. ) using a vulcanizing agent (trade name: C-8A) as a vulcanizing agent, and a curing reaction was performed at 150° C. for 1 hour. The solidified product obtained after cooling was gray-brown resin, and the yield was 98.9%. Next, after pulverizing the obtained cured product to a diameter of about 1 mm, 100 g of the pulverized product was put into an alumina crucible with an internal volume of 280 mL, and calcined at 1000° C. in a muffle furnace for 1 Hour. The obtained calcined product is a black glass-like...

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Abstract

The present invention relates to: a negative electrode active material for nonaqueous electrolyte secondary batteries, which is represented by elemental composition formula Met1-Si-O-C-H (wherein Met1 represents one alkali metal element or a mixture of alkali metal elements), and which contains a silicate salt that is composed of a silicon-based inorganic compound and the alkali metal, while having fine particles that are composed of silicon, a silicon alloy or silicon oxide dispersed within the silicate salt; and a negative electrode active material for nonaqueous electrolyte secondary batteries, which is represented by elemental composition formula Met2-Si-O-C-H (wherein Met2 represents one alkaline earth metal element or a mixture of alkaline earth metal elements), and which contains a silicate salt that is composed of a silicon-based inorganic compound and the alkaline earth metal.

Description

technical field [0001] The invention relates to a negative electrode active material for a non-aqueous electrolyte secondary battery and a manufacturing method thereof. Furthermore, the present invention relates to a negative electrode for a nonaqueous electrolyte secondary battery using the negative electrode active material, and a nonaqueous electrolyte secondary battery using the negative electrode. Background technique [0002] In recent years, with the significant development of portable electronic equipment and communication equipment, a non-aqueous electrolyte secondary battery with high energy density is urgently needed from the viewpoint of economy, miniaturization and weight reduction of equipment. In the past, as a countermeasure for improving the capacity of this non-aqueous electrolyte secondary battery, the following methods are known, for example: the negative electrode material uses boron (B), titanium (Ti), vanadium (V), manganese (Mn), cobalt (Co ), iron (...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/58H01M4/36H01M4/38H01M4/48
CPCH01M4/364H01M4/386H01M4/483H01M10/0525H01M2004/027H01M4/5825Y02E60/10H01M4/134Y02P70/50H01M4/0471H01M4/625
Inventor 中西铁雄谷口一行青木良隆山田佳益
Owner SHIN ETSU CHEM CO LTD
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