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Positive electrode active material

A positive electrode active material and composite oxide technology, applied in the direction of active material electrodes, positive electrodes, nickel compounds, etc., can solve the problem of insufficient discharge capacity, achieve the effect of improving cycle characteristics and increasing discharge capacity

Active Publication Date: 2016-01-13
SUMITOMO CHEM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the positive electrode active material is not a lithium-manganese-rich positive electrode active material, so the discharge capacity is not high enough

Method used

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Examples

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Effect test

Embodiment

[0132] The present invention will be described in detail through examples below, but the present invention is not limited by the following description. Examples 1 to 11 are examples of the present invention, and examples 12 to 16 are comparative examples.

[0133] [specific surface area]

[0134] The specific surface area of ​​the co-precipitate and the positive electrode active material was measured by the nitrogen adsorption BET (Brunauer-Emmett-Teller) method using a specific surface area measuring device manufactured by Mountec Corporation (device name: HMmodel-1208). In the case of a coprecipitate, the degassing was performed at 105° C. for 30 minutes, and in the case of a positive electrode active material, the degassing was performed at 200° C. for 20 minutes.

[0135] In addition, what dried the coprecipitate at 120 degreeC for 15 hours was used for the measurement of the specific surface area of ​​a coprecipitate.

[0136] [particle size]

[0137] Co-precipitate or...

example 1

[0161] Nickel(II) sulfate hexahydrate, cobalt(II) sulfate heptahydrate, and manganese(II) sulfate pentahydrate were dissolved in distilled water so that the ratios of Ni, Co, and Mn were as shown in Table 2, and such that The total concentration of Ni, Co and Mn was 1.5 mol / L to obtain an aqueous sulfate solution. Ammonium sulfate was dissolved in distilled water so as to have a concentration of 0.75 mol / L to obtain an ammonium sulfate aqueous solution.

[0162] Next, add distilled water to a 2L glass reaction tank with a baffle, heat it to 50°C with a mantle heater, and add The above aqueous sulfate solution and the above aqueous ammonium sulfate solution. The aqueous sulfate solution was added at a rate of 5.0 g / min. In the ammonium sulfate aqueous solution, the molar ratio of ammonium ions to the total amount of transition metal elements (X) composed of Ni, Co and Mn in the reaction tank (NH 4 + / X) as shown in Table 2. In addition, the initial pH of the reaction solut...

example 2～11、14～16

[0166]In addition to changing the feeding ratio of sulfate as shown in table 2, the reaction time (the addition time of sulfate aqueous solution), the pH of the reaction solution, the reaction temperature, the NH 4 + Except for the conditions of / X and Li / X, a positive electrode active material was obtained in the same manner as in Example 1.

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Abstract

The purpose of the present invention is to provide a positive electrode active material to be used for the positive electrodes of lithium-ion secondary batteries having a high discharge capacity and good cycle characteristics. The positive electrode active material comprises a lithium-containing composite oxide containing lithium (Li) and at least one type of transition metal element (X) selected from a group comprising nickel, cobalt, and manganese (however, the molar ratio (Li / X) of lithium to the total amount of the transition metal element (X) is 1.1 to 1.7). The aspect ratio of primary particles is 2.5 to 10. In X-ray diffraction patterns, a ratio (I020 / I003) of the integrated intensity of the peak of a (020) plane (I020) belonging to the crystal structure of a C2 / m space group to the integrated intensity of the peak of a (003) plane (I003) belonging to the crystal structure of an R-3m space group is 0.02 to 0.3.

Description

technical field [0001] The present invention relates to a positive electrode active material used in a positive electrode of a lithium ion secondary battery with high discharge capacity and good cycle characteristics. Background technique [0002] Lithium-ion secondary batteries are widely used in portable electronic devices such as mobile phones and notebook computers. As a lithium ion secondary battery, it is known, for example, to use LiCoO 2 A lithium ion secondary battery that uses a lithium alloy, graphite, carbon fiber, etc. as a negative electrode as a positive electrode active material. Although this lithium ion secondary battery has high energy density, it has a problem of high cost because Co element is expensive. [0003] Therefore, it is now proposed to reduce the amount of Co element, use Ni element, Co element and Mn element as the positive electrode active material of the replacement metal of Co element, as well as the crystal structure of the space group R...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/505H01M4/525
CPCH01M4/525C01G45/1228C01G51/42C01G53/42C01G53/50C01P2002/72C01P2004/03C01P2004/04C01P2004/61C01P2006/12H01M4/505H01M2004/028Y02E60/10
Inventor 酒井智弘池田定达高杉翼寺谷拓也
Owner SUMITOMO CHEM CO LTD
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