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Positive electrode active substance for nonaqueous electrolyte secondary cell, method for producing positive electrode active substance for nonaqueous electrolyte secondary cell, and nonaqueous electrolyte secondary cell

A positive active material, non-aqueous electrolyte technology, applied in non-aqueous electrolyte storage batteries, active material electrodes, secondary batteries and other directions, can solve the problem of non-aqueous electrolyte secondary battery capacity reduction and other issues

Inactive Publication Date: 2015-06-10
NISSAN MOTOR CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It is known that there is the following problem in the positive electrode active material of this solid solution: in the process of repeatedly charging and discharging the secondary battery, the transition metal dissolves into the electrolyte solution
Due to the elution of transition metals, the crystal structure of the positive electrode active material changes, resulting in a decrease in the capacity of the non-aqueous electrolyte secondary battery

Method used

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  • Positive electrode active substance for nonaqueous electrolyte secondary cell, method for producing positive electrode active substance for nonaqueous electrolyte secondary cell, and nonaqueous electrolyte secondary cell
  • Positive electrode active substance for nonaqueous electrolyte secondary cell, method for producing positive electrode active substance for nonaqueous electrolyte secondary cell, and nonaqueous electrolyte secondary cell
  • Positive electrode active substance for nonaqueous electrolyte secondary cell, method for producing positive electrode active substance for nonaqueous electrolyte secondary cell, and nonaqueous electrolyte secondary cell

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0146] (Preparation of titanium-citric acid complex aqueous solution)

[0147] Add 60g (0.3mol) of citric anhydride (molecular weight: 192.12g / mol) into 400ml of acetone, and heat to 60°C for dissolution. Then, 56 g (0.2 mol) of titanium tetraisopropoxide (molecular weight 284.22 g / mol) was added to form a precipitate. The liquid was filtered with suction to obtain a precipitate (pale yellow).

[0148] Add H to the precipitate 2 O (200ml), heated to 50-60°C to dissolve. The solution was left to stand for more than one day to settle the insoluble matter, and then filtered to remove the insoluble matter to obtain a titanium-citric acid complex aqueous solution. Ti concentration as TiO 2 (Molecular weight: 79.87 g / mol) was calculated as 5.0 weight%.

[0149] (Preparation of positive electrode active material C1) Li 1.5 [Ni 0.375 mn 0.775 [Li] 0.25 Ti 0.10 ]O z

[0150] To 15.97g titanium-citric acid complex aqueous solution (with TiO 2 Add 15.93g manganese acetate te...

Embodiment 2

[0202] (Preparation of positive electrode active material C2) Li 1.5 [Ni 0.375 mn 0.775 [Li] 0.25 Ti 0.10 ]O z

[0203] To 15.97g titanium-citric acid complex aqueous solution (using TiO 2 Add 15.93g manganese acetate tetrahydrate (molecular weight 245.09g / mol), 6.22g nickel acetate tetrahydrate (molecular weight 248.84g / mol), 1.01 times the amount of 15.31g (15.46g) Lithium acetate dihydrate (molecular weight: 102.02 g / mol). The obtained mixture is heated to 200°C to 300°C to melt and dissolve. Then, using a spray drying apparatus, the obtained molten solution (slurry) is heated and sprayed at 200°C to 400°C, and dried. The obtained dry powder was calcined at 900° C. for 12 hours after pre-calcining at 600° C. for 4 hours. Add 10g of calcined powder into 100ml of pure water, stir and mix for two minutes, then quickly filter with suction. After drying the filtrate at 200°C, it was baked at 400°C for 1 hour.

[0204] The composition of the positive electrode active m...

Embodiment 3

[0209] The positive electrode active material C3 was prepared according to Example 2. In addition, an evaluation battery cell was manufactured according to Example 1, and after the initial charge treatment and activation treatment, performance evaluation and lifetime evaluation were performed. The evaluation results are shown in Table 1 and Table 3 below.

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Abstract

[Problem] To provide a means that can suppress elution of transition metals, particularly manganese, in a positive electrode active substance for a nonaqueous electrolyte secondary cell. [Solution] The present invention provides a positive electrode active substance for a nonaqueous electrolyte secondary cell that has the composition formula (1) Li1.5[NiaMnbCoc[Li]d[X]e]Oz (where X is at least one selected from Ti, Zr, and Nb, 0.01 ≤ e ≤ 0.7, a + b + c + d + e = 1.5, 0.1 ≤ d ≤ 0.4, 1.1 ≤ [a + b + c + e] ≤ 1.4, and z is the number of oxygen atoms that satisfies atomic valency), and that has a diffraction peak showing a halite-type layered structure at 20-23º, 35-40º (101), 42-45º (104), and 64-65 (108) / 65-66 (110) in X-ray diffraction (XRD) determination.

Description

technical field [0001] The present invention relates to a positive electrode active material for a nonaqueous electrolyte secondary battery, a method for producing the positive electrode active material for a nonaqueous electrolyte secondary battery, and a nonaqueous electrolyte secondary battery. Background technique [0002] Currently, non-aqueous electrolyte secondary batteries typified by lithium ion secondary batteries used for mobile devices such as mobile phones are being commercialized. A non-aqueous electrolyte secondary battery generally has a structure in which a positive electrode formed by applying a positive electrode active material and the like to a current collector, and a negative electrode formed by applying a negative electrode active material and the like to a current collector are sandwiched between a separator to maintain a non-aqueous battery. An electrolyte layer made of an aqueous electrolyte solution or a non-aqueous electrolyte gel is connected. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/505C01G53/00H01M4/36H01M4/525H01M4/587H01M10/052H01M10/0567H01M10/0568H01M10/0569
CPCC01G53/50H01M4/131H01M4/505H01M4/525H01M4/587H01M10/052H01M10/0567H01M10/0568H01M10/0569H01M2004/027H01M2004/028H01M2300/0037C01P2002/72C01P2004/61C01P2006/12C01P2006/40Y02E60/10Y02T10/70C01G53/006H01M4/133H01M10/0525
Inventor 山本伸司光山知宏
Owner NISSAN MOTOR CO LTD
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