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Positive active substance for non-aqueous electrolyte secondary battery and manufacturing method of positive active substance

A positive electrode active material and non-aqueous electrolyte technology, applied in battery electrodes, circuits, electrical components, etc., can solve problems such as insufficient thermal stability and reduced discharge capacity, and achieve sufficient charge-discharge cycle characteristics, high practicability, and thermal stability good sex effect

Inactive Publication Date: 2013-09-11
NANTONG RESHINE NEW MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004]However, when lithium-cobalt composite oxide is used as the positive electrode active material, there are charge-discharge cycle characteristics in which the discharge capacity decreases due to repeated charge-discharge cycles, or when heating after charging The problem of insufficient thermal stability

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Mix NiSO4, CoSO4, and MnSO4 in a molar ratio of Ni:Co:Mn=5:2:3, dissolve in deionized water, and make a solution with a comprehensive ion concentration of 2mol / 1. Prepare 8mol / 1 sodium hydroxide solution, and add NH in the sodium hydroxide solution 3 :NaOH= 0.2 ammonia water. Put the two mixed solutions into the reaction kettle in parallel, under the protection of nitrogen or inert gas, control the reaction in a continuous reaction mode, control the pH between 10~12, and the temperature is 50~60°C, when the particle size reaches the requirement, filter and wash Until the pH value of the washed water is less than 8, dry it at 120°C to obtain Ni 0.5 co 0.2 mn 0.3 (OH) 2 Precursor.

[0016] Lithium carbonate and the aforementioned precursor were weighed according to the molar ratio of Li / (Ni+Co+Mn)=1.1, uniformly mixed for 4 hours, and the uniformly mixed material was put into a sintering furnace for sintering at a rate of 2°C / min. The temperature was raised at a hi...

Embodiment 2

[0021] Mix NiSO4, CoSO4, and MnSO4 in a molar ratio of Ni:Co:Mn=5:2:3, dissolve in deionized water, and make a solution with a comprehensive ion concentration of 2mol / 1. Prepare 8mol / 1 sodium hydroxide solution, and add NH in the sodium hydroxide solution 3 :NaOH= 0.2 ammonia water. Put the two mixed solutions into the reaction kettle in parallel, under the protection of nitrogen or inert gas, control the reaction in a continuous reaction mode, control the pH between 10~12, and the temperature is 50~60°C, when the particle size reaches the requirement, filter and wash Until the pH value of the washed water is less than 8, dry it at 120°C to obtain Ni 0.5 co 0.2 mn 0.3 (OH) 2 Precursor.

[0022] Lithium carbonate and the aforementioned precursor were weighed according to the molar ratio of Li / (Ni+Co+Mn)=1.1, uniformly mixed for 4 hours, and the uniformly mixed material was put into a sintering furnace for sintering at a rate of 2°C / min. The temperature was raised at a hi...

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Abstract

The invention discloses a positive active substance for a non-aqueous electrolyte secondary battery. The positive active substance is formed by lithium-containing composite oxide powder with the chemical formula of LipNxMyOzFa, a surface layer of the powder is coated with at least one of lithium zirconate, lithium silicate and lithium titanate, N in the chemical formula is at least one element of Ni, Co and Mn, and M in the chemical formula is at least one element of transitional metal elements except for the element N, Al and alkali earth metal elements. Compared with the prior art, the positive active substance for the non-aqueous electrolyte secondary battery has an adequate charging and discharging cycling property in the real application process, and the charging-discharging cycling property or the heat stability in heating after charging is good. The positive active substance is high in practicability and wide in application range.

Description

technical field [0001] The invention relates to a positive electrode active material used in nonaqueous electrolyte secondary batteries such as lithium ion secondary batteries and a manufacturing method thereof. Background technique [0002] At present, with the rapid development of information-related equipment such as personal computers and mobile phones or communication equipment in recent years, there is an increasing demand for non-aqueous electrolyte secondary batteries such as lithium secondary batteries that are small, lightweight, and have high energy density. . The known positive electrode active material of described non-aqueous electrolyte secondary battery has LiCoO2, LiNi0 2 , Li2MnO4, LiNi0.6Co0.2Mn0.2O2 and other lithium and transition metal composite oxides. [0003] Wherein, owing to use lithium-cobalt composite oxide as positive electrode active material, the lithium secondary battery that uses carbon materials such as lithium alloy, graphite, carbon fib...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/505H01M4/525
CPCY02E60/10
Inventor 王梁梁张新龙刘奇朱祥陈亮
Owner NANTONG RESHINE NEW MATERIAL
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