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Composite particle for electrode, its manufacturing method, and nonaqueous electrolyte secondary battery

A composite particle and manufacturing method technology, applied in secondary batteries, non-aqueous electrolyte batteries, battery electrodes, etc., can solve the problems of inability to obtain cycle characteristics, catalyst detachment, incomplete construction of electronic conduction network, etc.

Inactive Publication Date: 2007-05-16
PANASONIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the generation rate of carbon nanofibers is low, and the catalyst is easily detached from the surface of the active material
Therefore, even if the electrode is made of an active material grown with carbon nanofibers, the construction of the electronic conduction network is incomplete.
Therefore, in electrochemical devices such as capacitors and secondary batteries, the expected improvement in cycle characteristics cannot be obtained (Patent Document 9)

Method used

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  • Composite particle for electrode, its manufacturing method, and nonaqueous electrolyte secondary battery
  • Composite particle for electrode, its manufacturing method, and nonaqueous electrolyte secondary battery
  • Composite particle for electrode, its manufacturing method, and nonaqueous electrolyte secondary battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0167] Dissolve 1 g of nickel nitrate hexahydrate (special grade) produced by Kanto Chemical Co., Ltd. in 100 g of deionized water. The obtained solution was mixed with 100 g of silicon particles (Si) produced by Kosun Chemical Laboratories Co., Ltd. which had been pulverized to a size of 10 μm or less. After stirring the mixture for 1 hour, water was removed with an evaporator apparatus. As a result, active material particles composed of silicon particles as an electrochemically active phase and nickel nitrate supported on the surface were obtained.

[0168]The silicon particles carrying nickel nitrate were charged into a ceramic reaction vessel, and the temperature was raised to 550° C. in the presence of helium gas. Thereafter, the helium gas was replaced with a mixed gas of 50% by volume of hydrogen gas and 50% by volume of methane gas, and the reaction vessel was kept at 550° C. for 3 hours. As a result, tubular carbon nanofibers with a fiber diameter of about 80 nm and...

Embodiment 2

[0173] Cobalt nitrate hexahydrate (special grade) produced by 1g Kanto Chemical Co., Ltd. replaces 1g nickel nitrate hexahydrate and is dissolved in 100g deionized water; Electrode material B for an electrolyte secondary battery. The particle size of the cobalt particles carried on the silicon particles was substantially the same as that of the nickel particles in Example 1. The fiber diameter, fiber length, and weight ratio to the active material particles of the grown herringbone carbon nanofibers were almost the same as in Example 1. Here, in SEM observation, in addition to fibers having a fiber diameter of about 80 nm, the existence of fine fibers having a fiber diameter of 30 nm or less was also confirmed.

Embodiment 3

[0175] 20% by weight of silicon particles ground to 10 μm or less and 80% by weight of nickel particles produced by Kanto Chemical Co., Ltd. ground to 10 μm or less were mixed. A mechanical alloying method is used to apply a shear force to the obtained mixture to obtain NiSi alloy particles with an average particle diameter of 20 μm. Except having used the obtained NiSi alloy particle instead of a silicon particle, it carried out similarly to Example 1, and this was set as the electrode material C of a nonaqueous electrolyte secondary battery. The particle size of the nickel particles carried on the NiSi alloy particles was substantially the same as that of the nickel particles in Example 1. The fiber diameter, fiber length, and weight ratio of the grown tubular carbon nanofibers to the active material particles were almost the same as in Example 1. Here, in SEM observation, in addition to fibers having a fiber diameter of about 80 nm, the existence of fine fibers having a fi...

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Abstract

The invention relates to a composite particle for electrodes containing an active material particle, carbon nanofibers bonded to the surface of the active material particle, and a catalyst element for accelerating growth of the carbon nanofibers wherein the active material particle is composed of an electrochemically active phase. For example, Au, Ag, Pt, Ru, Ir, Cu, Fe, Co, Ni, Mo or Mn is used as the catalyst element. Such a composite particle for electrodes can be produced by a method which comprises a step for preparing an active material particle which contains a catalyst element for accelerating growth of carbon nanofibers in at least a surface portion, and a step for growing carbon nanofibers on the surface of the active material particle in an atmosphere containing a raw material gas.

Description

technical field [0001] The present invention relates to composite particles obtained by improving chargeable and dischargeable active material particles, and more specifically, to active material particles having carbon nanofibers bonded to the surface. In addition, the present invention also relates to a method for efficiently growing carbon nanofibers on the surface of an active material. Furthermore, the present invention further relates to a nonaqueous electrolyte secondary battery and capacitor having excellent initial charge and discharge characteristics or cycle characteristics. Background technique [0002] With the development of portable and cordless electronic devices, people are increasingly looking forward to small, lightweight and high energy density non-aqueous electrolyte secondary batteries. Currently, carbon materials such as graphite have been put into practical use as negative electrode active materials for nonaqueous electrolyte secondary batteries. In...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/58H01M10/40C01B31/02H01G9/00B01J23/74H01M4/131H01M4/139H01M4/50H01M4/505H01M4/52H01M4/525H01M10/052H01M10/36
CPCH01M4/505B01J21/08C01B2202/34B01J23/74C01B31/0233D01F9/1271C01B2202/36D01F9/127H01G11/46Y02E60/122Y02E60/13H01M4/625B01J23/75H01M10/052H01M4/366B01J21/185B01J23/755B82Y30/00H01G9/058B01J23/70H01M4/525B01J23/78H01G11/36D01F9/1273B01J35/0013B01J23/38B82Y40/00B01J23/8892H01G9/155D01F9/1272H01M4/139H01M4/131C01B32/162Y02E60/10H01G11/24H01G11/34H01M4/583H01G11/22H01M4/96H01G9/00Y02E60/50
Inventor 石田澄人芳泽浩司古结康隆松田博明浅利琢磨大塚隆
Owner PANASONIC CORP
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