Positive electrode body for nonaqueous electrolyte battery, method for producing same, and nonaqueous electrolyte battery

A non-aqueous electrolyte and solid electrolyte technology, which is applied in the direction of non-aqueous electrolyte battery electrodes, non-aqueous electrolyte batteries, battery electrodes, etc., can solve the problems of poor output characteristics, increased resistance, and low capacity of all-solid-state Li-ion batteries, and achieve Li High ion conductivity and the effect of suppressing the increase of interface resistance

Inactive Publication Date: 2013-01-23
SUMITOMO ELECTRIC IND LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Compared with Li-ion batteries using organic electrolytes, all-solid-state Li-ion batteries using solid electrolytes suffer from low capacity and poor output characteristics
A possible cause of the problem is that at the contact interface between the positive electrode layer and the solid electrolyte layer, interdiffusion between these layers occurs to form a high-resistance layer, thereby causing an increase in resistance (hereinafter referred to as interface resistance)

Method used

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  • Positive electrode body for nonaqueous electrolyte battery, method for producing same, and nonaqueous electrolyte battery
  • Positive electrode body for nonaqueous electrolyte battery, method for producing same, and nonaqueous electrolyte battery

Examples

Experimental program
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Effect test

Embodiment approach

[0043] [overall composition]

[0044] Such as figure 2 As shown, the non-aqueous electrolyte battery 100 according to the present invention includes: a positive electrode body 1 (positive electrode body 1) for a non-aqueous electrolyte battery; a negative electrode body 2; a solid electrolyte layer 3 arranged between the two electrode bodies; 1 a positive electrode current collector 4 with a current collecting function; and a negative electrode current collector 5 with a negative electrode body 2 current collecting function. The most prominent feature of the present invention is the composition of the positive electrode body 1 . The following is first based on figure 1 The positive electrode body 1 and its manufacturing method according to the present invention will be described, followed by other configurations other than the positive electrode body 1 .

[0045] [positive body]

[0046] The positive electrode body 1 for a non-aqueous electrolyte battery according to the ...

Embodiment 1

[0081] Firstly, the cathode body 1 is prepared.

[0082] (1) Coating step

[0083] Equimolar amounts of LiOEt and Nb(OEt) 5 Dissolve in ethanol to prepare precursor coating solution. The precursor coating solution is coated on the entire surface of the positive electrode active material particle 10a, and the coating thickness is 8nm, wherein the positive electrode active material particle 10a is made of LiCoO with an average particle diameter of 5 μm. 2 Powder composition. At this time, under ultrasonic vibration, the precursor coating solution is applied to the positive electrode active material particles 10a by isomorphic spraying method. Subsequently, ethanol as a solvent was evaporated, thereby forming a precursor coating layer.

[0084] (2) Hypoxia formation step

[0085] In a hydrogen-containing atmosphere with a hydrogen concentration of 100% by volume, the positive electrode active material particles 10a coated with the precursor coating layer in the coating step ...

Embodiment 2

[0091] The positive electrode body 1 in Example 2 differs from the positive electrode body 1 in Example 1 in the degree of oxygen deficiency α formed in the coating layer 10b. Hereinafter, this difference will be mainly described, and other configurations that are the same as in Embodiment 1 will not be described.

[0092] The positive electrode body 1 in this example differs from the positive electrode body 1 in Example 1 in the conditions under which the oxygen deficiency is generated in the oxygen deficiency forming step. In a hydrogen-containing atmosphere with a hydrogen concentration of 50% by volume, the positive electrode active material particles 10a coated with the precursor coating layer are heat-treated at 300°C; as a result, oxygen deficiency occurs in the precursor coating layer, Thus, the cladding layer 10b is formed. At this time, the degree of hypoxia α is 0.01, and the conductivity is 10 -5 S / cm. As in Example 1, this value of conductivity may result from ...

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Abstract

Disclosed is a positive electrode body for a nonaqueous electrolyte battery, which suppresses increase in interface resistance by suppressing the formation of a high resistance layer at the contact interface between a positive electrode active material particle and a solid electrolyte particle. Specifically disclosed is a positive electrode body (1) for a nonaqueous electrolyte battery, wherein coated positive electrode active material particles (10), each of which is obtained by covering the surface of a positive electrode active material particle (10a) with a coating layer (10b) that has Li ion conductivity, and sulfide solid electrolyte particles (11) are mixed. The coating layer (10b) is formed from an amorphous oxide having oxygen deficiency. By having oxygen deficiency in the coating layer (10b), Li ion conductivity and electron conductivity sufficient for charge and discharge of a battery can be stably secured in the coating layer (10b).

Description

technical field [0001] The present invention relates to: a positive electrode body for a nonaqueous electrolyte battery, which is suitable for Li ion secondary batteries and the like; a method for manufacturing the positive electrode body; and a nonaqueous electrolyte battery. Background technique [0002] Nonaqueous electrolyte batteries have been used as power sources for smaller electrical devices such as portable devices. Such a nonaqueous electrolyte battery includes a positive electrode layer, a negative electrode layer, and an electrolyte layer disposed between these two electrode layers. A representative example of the nonaqueous electrolyte battery is a Li ion secondary battery that is charged and discharged by exchanging Li ions between a positive electrode layer and a negative electrode layer through an electrolyte layer. [0003] In recent years, a Li-ion secondary battery has been proposed, which is an all-solid-state Li-ion battery in which no organic electrol...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/13H01M4/139H01M10/052H01M10/0562
CPCY02E60/12Y02E60/122H01M4/5815H01M4/131H01M10/052H01M4/366H01M4/364H01M4/485Y10T29/49204Y02E60/10H01M4/36H01M4/13H01M4/139
Inventor 太田进启小川光靖神田良子
Owner SUMITOMO ELECTRIC IND LTD
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