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

A kind of negative electrode active material, negative electrode technology

Pending Publication Date: 2022-04-26
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 the decomposed product of the electrolyte solution is formed on the newly formed surface, the electrolyte solution is consumed.
Thus the cycle characteristic becomes easy to degrade

Method used

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1-1

[0228] First, a negative electrode active material was produced in the following manner. The raw material mixed with metal silicon, silicon dioxide, and Mn as the metal component is introduced into the reaction furnace, vaporized in an atmosphere with a vacuum degree of 10Pa, and then deposited on the adsorption plate, and the deposit is taken out after sufficient cooling, and is processed by a ball mill. To crush. Silicon compound particles obtained in such a way as SiO x has an x-value of 1.0. Next, the particle diameter of the silicon compound particles is adjusted by classification. Then, the surface of the silicon compound particles is covered with a carbon material by performing pyrolytic CVD.

[0229] Next, the silicon compound particles are modified by absorbing lithium into the silicon compound particles by a redox method. Then, heating is carried out in the range of 450°C to 750°C for modification. At this time, doping with lithium is performed slowly, and the r...

Embodiment 1-2

[0249] Set the concentration of biphenyl in the solution B used for lithium inhalation to 5% by mass, increase the concentration of biphenyl in the solution, and increase the raffinate component during filtration, thereby changing the carboxylic acid structure after heat treatment. coverage of the substance. Others are carried out in the same manner as in Example 1-1. Since it is difficult to quantify the amount of coverage of substances having a carboxylic acid structure, the increase or decrease is shown based on the peak intensity obtained by TOF-SIMS.

Embodiment 1-3

[0251] The procedure was performed in the same manner as in Example 1-1, except that the lithium doping amount was increased compared to Example 1-1.

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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, the silicon compound particles containing a silicon compound; the silicon compound particles contain Li2SiO3; at least a portion of the surface of the silicon compound particles is covered with a carbon layer; the surface layer of the negative electrode active material particles contains a substance having a carboxylic acid structure. As a result, the present invention provides a negative electrode active material capable of increasing battery capacity as the initial efficiency is improved, and achieving sufficient battery cycle characteristics.

Description

technical field [0001] The present invention relates to a negative electrode active material, a negative electrode and a method for producing them. Background technique [0002] In recent years, small electronic devices such as mobile terminals have been widely used, and further miniaturization, weight reduction, and longevity are strongly demanded. In response to such market demands, the development of a particularly small and lightweight secondary battery capable of achieving high energy density has been advanced. The application of this secondary battery is not limited to small electronic devices, and its application to large electronic devices represented by automobiles and power storage systems represented by houses and the like is 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 lead batteries and nickel-cadmium batteries. [0004] The ab...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/58H01M4/62H01M10/0525
CPCH01M4/366H01M4/5825H01M4/625H01M10/0525H01M2004/027C01B33/182C01B32/05H01M4/136C01B33/18H01M4/48H01M4/0402H01M4/0428H01M4/0459H01M4/587C01B33/32C01P2002/89H01M2004/021
Inventor 广濑贵一酒井玲子大泽祐介松野拓史高桥广太西浦克典房楠
Owner SHIN ETSU CHEM IND CO LTD
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