Negative electrode active material, negative electrode, and secondary battery

A negative electrode active material and battery technology, applied in the direction of active material electrodes, secondary batteries, non-aqueous electrolyte battery electrodes, etc., can solve the problems of unobtainable cycle characteristics, achieve excellent initial charge and discharge efficiency, inhibit physical deterioration, and excellent cycle The effect of the characteristic

Pending Publication Date: 2022-05-13
MURATA MFG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the reductive decomposition of the electrolyte solution is promoted during charging, and a practical level of cycle characteristics cannot be obtained.

Method used

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  • Negative electrode active material, negative electrode, and secondary battery
  • Negative electrode active material, negative electrode, and secondary battery
  • Negative electrode active material, negative electrode, and secondary battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0232] (Manufacture of negative electrode active material)

[0233] 70 g of ethanol in which 10.0 g of 28% by weight ammonia water was dissolved was prepared. 60 g of SiO were added to this solution. Next, the first metal alkoxide and the second metal alkoxide were added so that the usage-amount with respect to 100 weight part of SiO added became the ratio of Table 3. Then, it stirred at room temperature (20 degreeC) for 120 minutes. The reaction solution was filtered, washed with acetone, and the coated powder was dried at 80° C. for 120 minutes to form a coating (thickness: 3 nm) on the surface of SiO. Thus, the fabrication of SiO (negative electrode active material) covered with the organic-inorganic hybrid film was completed.

[0234] (manufacturing of batteries)

[0235] · Negative electrode production process

[0236] A negative electrode was fabricated as follows. First, 28.79% by weight of the above negative electrode active material, 67.16% by weight of carbon-b...

Embodiment 2～20 and comparative example 1～3

[0275] Except that when manufacturing the negative electrode active material, the types and compounding amounts of the first metal alkoxide and the second metal alkoxide were changed as described in Table 3, by the same method as in Example 1, the manufacture of the battery and Evaluation of battery characteristics.

[0276] [table 3]

[0277]

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Abstract

Provided is a negative electrode active material for a battery, which exhibits sufficiently excellent initial charge / discharge efficiency and cycle characteristics by suppressing physical deterioration of a coating film caused by expansion and contraction of a core material. The present invention relates to a negative electrode active material (10) for a battery, the negative electrode active material comprising: a negative electrode active material core material (1); and a coating film (2) formed on the surface of the negative electrode active material core material (1), the coating film (2) being an organic-inorganic hybrid coating film comprising a reactant containing at least: a first metal alkoxide that does not contain a metal atom-carbon atom bond in one molecule; and a second metal alkoxide containing two or more metal atom-carbon atom bonds in one molecule.

Description

technical field [0001] The invention relates to a negative electrode active material, a negative electrode and a secondary battery. Background technique [0002] Conventionally, secondary batteries have been used as power sources for various electronic devices. A secondary battery generally has a structure in which an electrode assembly (electrode body) and an electrolyte are housed in an exterior body (case), and also includes external terminals (or electrode leads) for electrically connecting the secondary battery. The electrode assembly has a structure in which a positive electrode and a negative electrode are arranged with a separator interposed therebetween. [0003] The positive electrode and the negative electrode respectively have a positive electrode layer containing a positive electrode active material and a negative electrode layer containing a negative electrode active material. In the secondary battery, ions are introduced into the electrolyte due to "the posi...

Claims

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Application Information

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Patent Type & AuthorityApplications(China)
IPC IPC(8): H01M4/62H01M4/13H01M10/0525
CPCH01M4/628H01M4/13H01M10/0525Y04S30/12Y02T90/167H01M4/366H01M4/62Y02E60/10H01M4/0404H01M4/505H01M4/525H01M4/60H01M2004/027
Inventor久保田博信古池阳祐
OwnerMURATA MFG CO LTD