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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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] In addition, generally lith

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
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Example Embodiment

[0135] (Example 1)

[0136] Make lithium iron silicate (Li 2 FeSiO 4 ) Composite material of crystal and carbon material.

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

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

[0139] Using a planetary ball mill, the obtaine...

Example Embodiment

[0141] (Example 2)

[0142] Except for the heat treatment process, the same as in Example 1, the production of lithium iron silicate (Li 2 FeSiO 4 ) Composite material of crystal and carbon material. The heat treatment conditions were performed at 700° C. for 2 hours in an argon atmosphere containing 1 vol% of hydrogen.

Example Embodiment

[0143] (Example 3)

[0144] Using lithium iron silicate (Li 2 (Fe 0.9 Mg 0.1 )SiO 4 ) Crystal and carbon materials are used to make composite materials. As raw materials for lithium iron silicate, lithium nitrate, iron(Ⅲ) nitrate 9 hydrate, TEOS and magnesium nitrate 6 hydrate (Mg(NO) 3 ) 2 ·6H 2 O). Included in accordance with Li 2 (Fe 0.9 Mg 0.1 )SiO 4 In the aqueous solution of the above-mentioned lithium iron silicate raw material weighed in a stoichiometric composition, dextrin (carbon source) equimolar to lithium nitrate is added. Thereafter, in the same manner as in Example 1, the spray thermal decomposition step, the pulverization step, and the 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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