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Negative electrode active material, negative electrode for secondary battery, and lithium ion secondary battery

A negative electrode active material, secondary battery technology, applied in the direction of active material electrodes, secondary batteries, non-aqueous electrolyte battery electrodes, etc., can solve the problems of reduced charge and discharge cycle performance, isolation of active material particles, etc. The effect of the cycle feature

Active Publication Date: 2021-04-23
MURATA MFG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, as the mixing amount of the non-carbon material increases, isolation of the active material particles tends to occur during the charge-discharge cycle, and there is a problem that the charge-discharge cycle performance decreases.

Method used

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  • Negative electrode active material, negative electrode for secondary battery, and lithium ion secondary battery
  • Negative electrode active material, negative electrode for secondary battery, and lithium ion secondary battery
  • Negative electrode active material, negative electrode for secondary battery, and lithium ion secondary battery

Examples

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Embodiment 1

[0033] 2. Embodiment 1 (negative pole active material of the present invention, the negative pole that is used for secondary battery and lithium ion secondary battery)

Embodiment 2

[0034] 3. Embodiment 2 (variation of Embodiment 1)

Embodiment 3

[0035] 4. Embodiment 3 ( application example of the secondary battery)

[0036] 5. Other

[0037]

[0038] In the negative electrode and the like for secondary batteries of the present invention,

[0039] The first silicon oxide particles consist of SiO X forming (where X≤2.5, specifically, for example, 0.3≤X≤2.5),

[0040] The second silicon oxide particles can be made of SiO Y (where Y≦2.5, specifically, for example, 0.3≦Y≦2.5) formed form.

[0041] In the negative electrode for secondary batteries and the like of the present invention including the above preferred embodiments, the first silicon oxide particles may have a particle diameter of 1×10 in the major axis direction. -6 m to 1.5×10 -5 form of m. If the particle size of the first silicon oxide particles in the long axis direction exceeds 1.5×10 -5 m, the expansion and contraction of the first silicon oxide particles become larger during the charge-discharge cycle, and the first particles may be isolated duri...

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Abstract

A negative electrode active material constituting a negative electrode, comprising a mixture of the following materials, namely: a carbon material, a plurality of first particles (1) composed of first silicon oxide particles (2) and a carbon layer (3) covering the surface thereof , and a plurality of second particles (4) composed of carbon particles (5) and second silica particles (6) and the second silica particles (6) are arranged on the surface of the carbon particles (5), etc., when each The mass of the first silicon oxide particles in grams of negative electrode active material is M 1 grams, the mass of the second silica particle is M 2 When gram, satisfy 0.40≤M 1 / (M 1 +M 2 )≤0.85, when the discharge capacity caused by carbon material and carbon particles (5) is set as Cp c , the discharge capacity caused by the first silicon oxide particles (2) and the second silicon dioxide particles (6) is Cp so , satisfy 0.15≤Cp so / (Cp c +Cp so )≤0.5.

Description

technical field [0001] The present invention relates to a negative electrode active material, a negative electrode for a secondary battery having the negative electrode active material, and a lithium ion secondary battery having the negative electrode. Background technique [0002] Use the secondary battery of nonaqueous electrolytic solution, particularly lithium ion secondary battery wherein, compared with the secondary battery that has aqueous electrolyte solution in the past, i.e. lead battery or nickel-cadmium battery, can obtain big energy density, therefore, Expectations are high and the market is growing significantly. Especially in recent years, due to the light weight and high energy density of lithium-ion secondary batteries, which are suitable for use in electric vehicles or hybrid vehicles, it is intended to increase the size of lithium-ion secondary batteries to increase their capacity and high energy density. Research on exportation is booming. However, amon...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/13H01M4/36H01M4/48H01M4/587H01M10/052H01M10/0566H01M50/534
CPCH01M4/587H01M4/131H01M4/133H01M4/364H01M4/366H01M4/625H01M2220/20H01M4/485H01M10/0525H01M2004/027Y02E60/10Y02P70/50H01M50/534Y02T10/70H01M50/44H01M50/4295H01M4/505H01M4/525H01M4/583H01M4/623H01M4/661H01M10/0587H01M2004/028
Inventor 松下忠史仓塚真树
Owner MURATA MFG CO LTD