Positive electrode active material and non-aqueous electrolyte secondary cell

A positive electrode active material, anhydrous electrolyte technology, applied in non-aqueous electrolyte storage batteries, secondary batteries, active material electrodes, etc., can solve the problems of not being able to fully improve performance, difficult to improve operational performance and discharge performance at the same time, and achieve improved performance. High-temperature operation performance and high-current discharge performance, compensating for the decrease in ionic conductivity and electronic conductivity, and suppressing the effect of electrolyte decomposition

Active Publication Date: 2005-08-24
MURATA MFG CO LTD
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

However, according to studies conducted by the inventors of the present invention, it was found that the effect of sufficiently improving performance cannot be obtained by operating at a high temperature by the above-mentioned method (6)
[0008] As described above, according to the above method, it is difficult to simultaneously improve the operating performance at high temperature (hereinafter referred to as "high temperature operating performance") and the discharge performance of discharging a large current (hereinafter referred to as "large current discharging performance")

Method used

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  • Positive electrode active material and non-aqueous electrolyte secondary cell

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0067] (first lithium transition metal composite oxide)

[0068] An aqueous solution containing Ni to Mn in a molar ratio of 0.75 and 0.25, respectively, formed by using commercially available nickel nitrate and manganese nitrate is dropped to an aqueous ammonium solution (aqueous ammonium solution) while sufficiently stirring, thereby forming a composite hydroxide . This composite hydroxide was mixed with lithium hydroxide and sintered at 850° C. for 10 hours under oxygen flow, followed by pulverization, thereby forming a powdery lithium-nickel-manganese composite oxide, which was the first lithium transition metal composite oxide .

[0069] In addition, when the obtained first lithium transition metal composite oxide was analyzed by atomic absorption spectroscopy, the identified components consisted of LiNi 0.75 mn 0.25 o 2 express. Also, when the particle diameter was measured using a laser diffraction method, the average particle diameter was 12 micrometers. In addit...

Embodiment 2

[0090] A nonaqueous electrolyte secondary battery was formed in the same manner as in Example 1, except that the first composite oxide and the second composite oxide were mixed together thereby obtaining a weight ratio of A / B of 80 / 20, as in Example 1 In the case of , measure the cycle retention rate at 50°C and the retention rate under high current discharge.

Embodiment 3

[0092] A nonaqueous electrolyte secondary battery was formed in the same manner as in Example 1, except that the first composite oxide and the second composite oxide were mixed together thereby obtaining a weight ratio of A / B of 30 / 70, as in Example 1 In the case of , measure the cycle retention rate at 50°C and the retention rate under high current discharge.

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Abstract

A non-aqueous electrolyte secondary cell having superior high temperature-operation properties and excellent large current-discharge properties is provided. The non-aqueous electrolyte secondary cell has a positive electrode composed of a positive electrode collector and positive electrode active material layers formed thereon. A positive electrode active material contained in the above layer is formed of a first composite oxide and a second composite oxide mixed therewith. The first composite oxide is formed of grains of a first lithium transition metal composite oxide containing at least nickel as a transition metal and a cover layer formed on at least part of the surface of each of the grains for suppressing decomposition of an electrolyte caused by the first lithium transition metal composite oxide. The second composite oxide is composed of grains of a second lithium transition metal composite oxide.

Description

technical field [0001] The present invention relates to a positive electrode active material containing lithium and nickel as main components and a nonaqueous electrolyte secondary battery using the above positive electrode active material. Background technique [0002] In recent years, various portable electronic devices, such as video cameras, mobile phones, and notebook computers, have entered the market and demand is increasing. With the trend of compactness and light weight of electronic devices, in order to increase energy density, research and development of batteries used as portable power sources, especially research and development of secondary batteries, have been actively conducted. Compared with related aqueous electrolyte solution secondary batteries, such as lead batteries, nickel-cadmium batteries, and nickel-metal hydride batteries, lithium-ion batteries are in high demand because of their high energy density, and in addition, when the environmental toleranc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/16H01M4/02H01M4/36H01M4/485H01M4/525H01M10/05H01M10/38
CPCY02E60/122H01M4/525H01M4/505H01M10/0525H01M4/366H01M10/0587H01M4/364H01M4/485H01M4/131Y02E60/10Y02P70/50H01M4/02H01M4/58H01M10/05
Inventor 细谷洋介
Owner MURATA MFG CO LTD
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