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Positive electrode active material

A positive active material and electrode technology, applied in the field of positive active materials, can solve the problems of high capacity and unstable crystal structure, achieve high capacity, improve initial charge and discharge efficiency, discharge capacity retention rate, and maintain capacity. Effect

Inactive Publication Date: 2014-11-19
NISSAN MOTOR CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] However, in the non-aqueous electrolyte secondary battery described in the above-mentioned Patent Document 1, although the initial charge-discharge efficiency is improved by introducing oxygen vacancies, there is a problem that the crystal structure is unstable and high capacity cannot be obtained.

Method used

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Examples

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Embodiment

[0083] Hereinafter, the present invention will be described in more detail based on examples, but the present invention is not limited to these examples.

[0084] (1) Synthesis of positive active material

[0085] As the positive electrode active material, a composite carbonate method was used to synthesize a solid solution composed of a lithium-containing composite oxide.

[0086] First, as the starting material, use the sulfates of Ni, Co, Mn, Al, Fe, and Ti, and weigh them separately to make Ni, Co, Mn, Al, Fe, and Ti reach the specified molar ratio, Stir and mix in medium, and add 2M sodium carbonate dropwise to prepare the precursor of composite carbonate.

Embodiment 1

[0092] To form Li 1.14 Ni 0.17 Co 0.07 Al 0.02 Mn 0.56 O 2 , The molar ratios of Ni, Co, and Mn were set to 0.2125, 0.0875, and 0.7, respectively, and adjusted so that the molar ratio of Li relative to the metal composition M made up of Ni-Co-Mn was 1.425, and so that Al It is adjusted so that the metal composition M is 0.025, and mixed.

Embodiment 2

[0094] To form Li 1.14 Ni 0.17 Co 0.07 Fe 0.02 Mn 0.56 O 2 , The molar ratios of Ni, Co, and Mn are set to 0.2125, 0.0875, 0.7, respectively, and the molar ratio of Li is adjusted so that the metal composition M of the Ni-Co-Mn is 1.425, and the ratio is adjusted to make Fe It is adjusted and mixed so that the metal composition M is 0.025.

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Abstract

A solid-solution complex oxide represented by the compositional formula [Li1.5][Li{0.5{1-x}-ny}□(n-1)yM'nyMn1-xM1.5x]O3 (wherein x satisfies 0.1<=x<=0.5, M represents NialphaCobetaMngamma, in which 0<alpha<=0.5, 0<=beta<=0.33, and 0<gamma<=0.5, M' represents at least one element selected from the group consisting of Mg, Zn, Al, Fe, Ti and V, with the valence (n) thereof being 2-5 inclusive and satisfying 0<ny<0.5. □ represents an electron hole) is used as a positive electrode active material.

Description

Technical field [0001] The present invention relates to a positive electrode active material used in electrochemical devices such as lithium ion secondary batteries and lithium ion capacitors. Background technique [0002] In recent years, as a countermeasure against air pollution and global warming, CO 2 Displacement reduction, in the automotive industry, expect to reduce CO by introducing hybrid electric vehicles (HEV) and electric vehicles (EV) 2 Displacement, as a power source for driving motors of these vehicles, high-performance secondary batteries are being developed. [0003] As such secondary batteries for driving motors, high capacity and excellent cycle characteristics are particularly required. Therefore, lithium ion secondary batteries having high theoretical energy among various secondary batteries are attracting attention. [0004] Generally, a lithium ion secondary battery has a structure in which a positive electrode active material is coated on both sides of a posit...

Claims

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Application Information

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IPC IPC(8): H01M4/505H01M4/525
CPCH01M10/0525H01M4/505Y02E60/122Y02T10/6278H01M4/131Y02E60/10H01M4/525Y02T10/70
Inventor 伊藤淳史大泽康彦
Owner NISSAN MOTOR CO LTD
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