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Positive electrode material for lithium ion secondary battery, positive electrode for lithium ion secondary battery, and lithium ion secondary battery

A technology of secondary battery and positive electrode material, applied in the field of lithium ion secondary battery, can solve the problem of low conductivity of lithium silicate, and achieve the effect of high energy density and high capacity

Active Publication Date: 2014-05-07
SHOEI CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] In addition, generally lithium silicates have low conductivity

Method used

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  • Positive electrode material for lithium ion secondary battery, positive electrode for lithium ion secondary battery, and lithium ion secondary battery
  • Positive electrode material for lithium ion secondary battery, positive electrode for lithium ion secondary battery, and lithium ion secondary battery
  • Positive electrode material for lithium ion secondary battery, positive electrode for lithium ion secondary battery, and lithium ion secondary battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0136]Lithium iron silicate (Li 2 FeSiO 4 ) composite material of crystal and carbon material.

[0137] As the raw material of lithium iron silicate, lithium nitrate (LiNO 3 ), iron(III) nitrate 9 hydrate (Fe(NO 3 ) 3 9H 2 O) and tetraethoxysilane (hereinafter, marked as TEOS) (Si(OC 2 h 4 ) 4 ). Include according to Li 2 FeSiO 4 Glucose was added as a carbon source to the aqueous solution of the above-mentioned lithium iron silicate raw material weighed in a stoichiometric composition manner. The amount of glucose added is equal to the molar number of lithium nitrate.

[0138] The obtained solution was formed into droplets using an ultrasonic nebulizer, and nitrogen gas was introduced as a carrier gas into an electric furnace heated to a set temperature of 800°C for thermal decomposition and reaction to obtain an intermediate of the composite material (spray pyrolysis process).

[0139] The obtained intermediate was wet pulverized using a planetary ball mill. The...

Embodiment 2

[0142] Except for the heat treatment process, it is the same as in Example 1 to make lithium iron silicate (Li 2 FeSiO 4 ) composite material of crystal and carbon material. The heat treatment conditions were 700° C. for 2 hours in an argon atmosphere containing 1% by volume of hydrogen.

Embodiment 3

[0144] Lithium iron silicate obtained by substituting a part of iron with magnesium (Li 2 (Fe 0.9 Mg 0.1 ) SiO 4 ) crystals and carbon materials to make composite materials. As raw materials for lithium iron silicate, lithium nitrate, iron (Ⅲ) 9 hydrate, TEOS and magnesium nitrate hexahydrate (Mg(NO 3 ) 2 ·6H 2 O). Include according to Li 2 (Fe 0.9 Mg 0.1 ) SiO 4 Dextrin (carbon source) equimolar to lithium nitrate was added to the aqueous solution of the above-mentioned lithium iron silicate raw material weighed in the manner of stoichiometric composition. Thereafter, in the same manner as in Example 1, a spray pyrolysis step, a pulverization step, and a heat treatment step were performed.

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Abstract

A positive electrode material for a lithium ion secondary battery: including a composite material comprising a lithium silicate crystal and a carbon material; having an infrared absorption spectrum peak for the composite material in the wavelength range of 1,400 cm<-1>-1,550 cm<-1>; and not having a Raman spectrum peak for the composite material in the wavelength range of 1,000 cm<-1>-1,150 cm<-1>.

Description

technical field [0001] The present invention relates to a positive electrode material for a lithium ion secondary battery, a positive electrode for a lithium ion secondary battery and a lithium ion secondary battery. technical background [0002] Lithium-ion secondary batteries are lighter in weight and larger in capacity than conventional lead secondary batteries, nickel-cadmium secondary batteries, and the like. Therefore, it is widely used as a power source for electronic equipment such as mobile phones and notebook computers. In recent years, it has also begun to be used as batteries for electric vehicles, plug-in hybrid vehicles, and electric motorcycles. [0003] A lithium ion secondary battery is basically composed of a positive electrode, a negative electrode, an electrolyte (electrolyte solution), and a separator. For example, metal lithium, carbon capable of intercalating and deintercalating lithium ions, lithium titanate, etc. are used as negative electrodes, an...

Claims

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Application Information

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IPC IPC(8): H01M4/58H01M4/136H01M4/36H01M10/052H01M10/0566H01M4/583
CPCH01M4/133H01M4/136H01M4/364H01M4/58H01M10/0525H01M4/5825H01M4/587H01M4/625Y02E60/10
Inventor 根本淳史守屋真纪佐佐木洋和
Owner SHOEI CHEM
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