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Negative electrode active material, negative electrode, and method for producing negative electrode active material

A technology of negative electrode active material and manufacturing method, which is applied in the direction of active material electrode, negative electrode, battery electrode, etc., can solve the problems of consumption of electrolyte and easy degradation of cycle characteristics, and achieves increasing battery capacity, improving lithium diffusivity, and improving initial Effect of charge and discharge characteristics

Pending Publication Date: 2022-05-13
SHIN ETSU CHEM IND CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At this time, since the decomposition reaction of the electrolyte solution occurs on the newly formed surface, and a film of decomposition products of the electrolyte solution is formed on the newly formed surface, the electrolyte solution is consumed.
Therefore, the cycle characteristic will become easy to degrade

Method used

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  • Negative electrode active material, negative electrode, and method for producing negative electrode active material
  • Negative electrode active material, negative electrode, and method for producing negative electrode active material
  • Negative electrode active material, negative electrode, and method for producing negative electrode active material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1-1

[0173] First, a negative electrode active material was produced in the following manner. The raw material mixed with metal silicon and silicon dioxide is introduced into the reaction furnace, and the material vaporized in a vacuum atmosphere of 10 Pa is deposited on the adsorption plate and cooled sufficiently, and the deposit is taken out and pulverized by a ball mill. The silicon compound particles thus obtained SiO x has an x-value of 1.0. Next, the particle diameter of the silicon compound particles is adjusted by classification. After that, thermal decomposition CVD is performed in the range of 700° C. to 1000° C., whereby the carbon material is covered on the surface of the silicon compound particles to form a conductive carbon layer.

[0174] Next, using diethyl ether with reduced water content as a solvent for solution A and solution B, silicon compound particles were modified by absorbing lithium by a redox method (lithium doping treatment). At this time, in order ...

Embodiment 1-2

[0193] The solvent (diethyl ether) of the solution used for absorption and modification of lithium was dehydrated, and the water content was controlled to 50 ppm or less with respect to diethyl ether, and it was carried out in the same manner as in Example 1-1.

Embodiment 1-3

[0195] Lithium doping was carried out in the same manner as in Example 1-2 except that silicon compound particles covered with a carbon layer before lithium doping treatment were dried at 150° C. for 5 hours.

[0196] In the above manner, in Examples 1-1 to 1-3, the control of Li 6 Si 2 o 7 NMR peak intensities.

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Abstract

The present invention is a negative electrode active material containing negative electrode active material particles, the negative electrode active material being characterized in that the negative electrode active material particles contain silicon compound particles containing an oxygen-containing silicon compound, at least a part of the surface of the silicon compound particles is covered with a carbon layer, and the silicon compound particles contain Li6Si2O7 and Li2SiO3. As a result, provided is a negative electrode active material which is capable of increasing battery capacity by improving initial efficiency, and which is capable of achieving sufficient battery cycle characteristics.

Description

technical field [0001] The invention relates to a negative electrode active material, a negative electrode and a method for manufacturing the negative electrode active material. Background technique [0002] In recent years, small electronic devices such as mobile terminals have been widely used, and further miniaturization, weight reduction, and long life are strongly demanded. In response to such market demands, the development of a particularly small and lightweight secondary battery that can achieve high energy density has been promoted. The application of this secondary battery is not limited to small electronic devices, and it is used in large-scale vehicles represented by automobiles and the like. Applications to electrical storage systems represented by electronic equipment and houses are also being studied. [0003] Among them, lithium-ion secondary batteries are expected to be easy to miniaturize and increase in capacity, and can obtain higher energy density than ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/485H01M4/62H01M4/131H01M10/0525C01B33/32
CPCH01M4/366H01M4/485H01M4/625H01M4/131H01M10/0525C01B33/32H01M2004/027Y02E60/10H01M4/483H01M2004/021C01P2002/72C01P2002/86C01P2004/61H01M4/48H01M4/583
Inventor 广濑贵一大泽祐介古屋昌浩酒井玲子高桥广太松野拓史
Owner SHIN ETSU CHEM IND CO LTD
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