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Positive electrode active material and non-aqueous electrolyte secondary battery

A positive electrode active material and secondary battery technology, which is applied in the direction of non-aqueous electrolyte batteries, active material electrodes, secondary batteries, etc., can solve the problems that cannot fully meet the cycle performance and rate performance, and cannot fully meet the energy density. Reduced size, excellent cycle performance and rate performance, and high energy density

Pending Publication Date: 2022-07-12
BASF TODA BATTERY MATERIALS LLC +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these positive electrode active materials cannot fully satisfy the energy density required for lithium-ion secondary batteries in recent years, nor can they fully satisfy the cycle performance and rate property.

Method used

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Embodiment

[0277] Hereinafter, the present invention will be specifically described with reference to representative examples and comparative examples of the present invention, but the present invention is not limited to these examples.

[0278] "Examples and Comparative Examples Relating to Present Invention I"

Embodiment I-1

[0280] A 0.1 mol / L nickel sulfate aqueous solution and a 0.1 mol / L manganese sulfate aqueous solution were prepared. The above-mentioned nickel sulfate aqueous solution and the above-mentioned manganese sulfate aqueous solution were mixed so that the molar ratio of nickel and manganese was Ni:Mn=0.35:0.65 to obtain a mixed solution. Prepare a 1 mol / L sodium carbonate aqueous solution. 8 L of water was added to the closed-type reaction tank, nitrogen gas was introduced, and the temperature was maintained at 40°C. The above-mentioned mixed solution and the above-mentioned sodium carbonate aqueous solution were continuously dropped into the above-mentioned reaction tank at a rate of 5 mL / min while stirring. At the same time, the above-mentioned sodium carbonate aqueous solution was added dropwise so that pH=8.00 (±0.01). During the reaction, only the filtrate was discharged out of the reaction system by the concentrator, and the solid content was left in the reaction tank, and ...

Embodiment I-2

[0293] In Example I-1, a mixed solution of nickel sulfate aqueous solution, cobalt sulfate aqueous solution and manganese sulfate aqueous solution was added, so that the molar ratio of nickel, cobalt and manganese was Ni:Co:Mn=0.35:0.05:0.60. Example I-1 also obtained the powder of the coprecipitated precursor.

[0294] The resulting co-precipitated precursor is (Ni 0.35 Co 0.05 Mn 0.60 )CO 3 (carbonate precursor compound). The lithium carbonate powder was weighed so that the ratio (molar ratio) Li / (Ni+Co+Mn) of lithium to the coprecipitated precursor was 1.25, and the coprecipitated precursor was thoroughly mixed. The mixture was calcined in an oxidizing atmosphere at 850° C. for 5 hours using an electric furnace to obtain a positive electrode active material.

[0295] Using the obtained positive electrode active material, a button battery was produced in the same manner as in Example I-1, and a graph was drawn with the voltage V on the horizontal axis and the dQ / dV valu...

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Abstract

Provided is a positive electrode active material containing a layered lithium composite oxide containing Li, Ni, Mn, and optionally Co, the positive electrode active material being characterized in that: in a powder X-ray diffraction pattern using Cu-K [alpha] rays, x is greater than or equal to 1, and x is greater than or equal to 1, and x is greater than or equal to 2, in the powder X-ray diffraction pattern using Cu-K [alpha] rays; the relative height intensity ratio of the height intensity (IIa) of the maximum diffraction peak at 2 [theta] = 20.8 + / -1 DEG to the height intensity (IIb) of the maximum diffraction peak at 2 [theta] = 18.6 + / -1 DEG = (IIa) / (IIb) is 0.015-0.035, and the crystallite size calculated from (104) diffraction lines using the Scherrer equation is 25-40 nm; and the BET specific surface area obtained by the BET method is 3.5-8.5 m2 / g.

Description

[0001] The present invention is a divisional application of a Chinese invention patent application whose application date is September 13, 2017, the application number is 201780057739.8, and the invention name is "positive electrode active material and its manufacturing method, and non-aqueous electrolyte secondary battery", the original application Japanese Application No. 2016-184479 filed on September 21, 2016, Japanese Application No. 2016-242982 filed on December 15, 2016, Japanese Application No. 2017-173269 filed on September 8, 2017, and Japanese Application No. 2017-173269 filed on September 8, 2017 The priority of Japanese application 2017-173299. technical field [0002] The present invention relates to a positive electrode active material for a nonaqueous electrolyte secondary battery and a nonaqueous electrolyte secondary battery. Background technique [0003] In recent years, electronic devices such as AV equipment and personal computers have been rapidly becom...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G53/00C01G45/12H01M4/505H01M4/525H01M10/0525
CPCC01G53/50C01G45/1257H01M4/505H01M4/525H01M10/0525H01M2004/028H01M2004/021C01P2002/20C01P2002/50C01P2002/60C01P2002/72C01P2002/74C01P2006/12C01P2006/40C01P2002/54C01G53/006H01M10/052Y02E60/10H01M4/366H01M10/446C01G53/00C01G53/44C01G53/56H01M4/36
Inventor 井上大诚西川大辅山本学武井之上勝哉
Owner BASF TODA BATTERY MATERIALS LLC
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