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Nickel-based active material precursor, method of preparing same, nickel-based active material, and lithium secondary battery

A lithium secondary battery and active material technology, applied in the direction of secondary batteries, lithium batteries, active material electrodes, etc., can solve the problems of lithium secondary battery deterioration, long-term life, low charging/discharging efficiency, increased resistance, etc.

Pending Publication Date: 2020-01-03
SAMSUNG SDI CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when these cathode active materials are used, the migration distance of lithium ions is determined according to the size of secondary particles during charge and discharge, and the charge / discharge efficiency is not high due to such a physical distance
In addition, as the charge and discharge process is repeated, cracks occur in the primary particles, so lithium secondary batteries exhibit deteriorated long-term life, increased resistance, and unsatisfactory capacity characteristics, and therefore, there is still a need for improvement

Method used

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  • Nickel-based active material precursor, method of preparing same, nickel-based active material, and lithium secondary battery
  • Nickel-based active material precursor, method of preparing same, nickel-based active material, and lithium secondary battery
  • Nickel-based active material precursor, method of preparing same, nickel-based active material, and lithium secondary battery

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Embodiment approach

[0032] According to one embodiment, a nickel-based active material precursor for a lithium secondary battery includes a secondary particle comprising a plurality of granular structures, wherein each granular structure includes a porous core portion and a shell portion, wherein the The shell portion includes primary particles radially arranged on the porous core portion, and wherein the secondary particles have a plurality of radial centers.

[0033] refer to figure 1 , a nickel-based active material precursor for a lithium secondary battery includes secondary particles 200 including a plurality of granular structures 100 . refer to Figure 2A and 2B , the granular structures 100 each include a porous core portion 10 and a shell portion 20 including primary particles 30 radially arranged on the porous core portion 10 . refer to figure 1 , 2A and 2B, the secondary particle 200 includes the granular structures 100, and the granular structures 100 each have a radial center. ...

preparation Embodiment 1

[0103] Preparation Example 1: Preparation of nickel-based active material precursor (6:2:2): three-step method

[0104] Synthesis of nickel-based active material precursors (Ni 0.6 co 0.2 mn 0.2 (OH) 2 ). In the following preparation process, nickel sulfate (NiSO 4 ·6H 2 O), cobalt sulfate (CoSO 4 ·7H 2 O) and manganese sulfate (MnSO 4 ·H 2 O) Dissolved in distilled water as a solvent at a molar ratio of 6:2:2 to prepare a mixed solution. In addition, in order to form complex compounds, sodium hydroxide (NaOH) and ammonia water (NH 4 OH).

[0105] Step 1: 5.0L / hour feed rate, 1.5kW / m 3 stirring power, NH 4 OH 0.35M, 10.5 to 11.0 pH

[0106] Aqueous ammonia was added to a reactor equipped with a stirrer at a concentration of 0.35 mol / L (M). Maintaining 1.5kW / m 3 While the stirring power and the reaction temperature of 50 ℃, add the metal raw material (the mixed solution of nickel sulfate, cobalt sulfate and manganese sulfate) of 2mol / L (M) with the feed r...

preparation Embodiment 2

[0111] Preparation Example 2: Preparation of Nickel-Based Active Material Precursor (7:1.5:1.5)

[0112] A mixed solution was prepared in the same manner as in Preparation Example 1, except that nickel sulfate (NiSO 4 ·6H 2 O), cobalt sulfate (CoSO 4 ·7H 2 O) and manganese sulfate (MnSO 4 ·H 2 O) As the metal raw material, the molar ratio of 7:1.5:1.5 is mixed instead of 6:2:2, and the nickel-based active material precursor (Ni 0.7 co 0.15 mn 0.15 (OH) 2 ).

[0113] Step 1: 5.0L / hour feed rate, 3.0kW / m 3 stirring power, NH 4 OH 0.35M, 11.0 to 11.5 pH

[0114] Aqueous ammonia was added to a reactor equipped with a stirrer at a concentration of 0.35 mol / L (M). Maintaining 3.0kW / m 3While the stirring power and the reaction temperature of 50 ℃, add the metal raw material (the mixed solution of nickel sulfate, cobalt sulfate and manganese sulfate) of 2mol / L (M) with the feed rate of 5.0L / hour and 0.53L / hour respectively And 0.35mol / L (M) ammonia water. Subse...

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Abstract

The present invention relates to a nickel-based active material precursor, a method of preparing the same, a nickel-based active material, and a lithium secondary battery. The nickel-based active material precursor for the lithium secondary battery includes: a secondary particle including a plurality of particulate structures, wherein each particulate structure includes a porous core portion and ashell portion, the shell portion including primary particles radially arranged on the porous core portion; and the secondary particle has a plurality of radial centers. When the nickel-based active material precursor is used, a nickel-based positive active material having a short lithium ion diffusion distance, in which intercalation and deintercalation of lithium are facilitated, may be obtained. A lithium secondary battery manufactured using the nickel-based active material may exhibit enhanced lithium availability, and may exhibit enhanced capacity and lifespan due to suppression of crackformation in the active material during charging and discharging.

Description

[0001] Cross References to Related Applications [0002] This application claims the benefit of Korean Patent Application No. 10-2018-0073588 filed with the Korean Intellectual Property Office on June 26, 2018, the disclosure of which is incorporated herein by reference in its entirety. technical field [0003] One or more embodiments relate to a nickel-based active material precursor for a lithium secondary battery, a method for preparing the nickel-based active material precursor, a nickel-based active material precursor formed from the nickel-based active material precursor for A nickel-based active material for a lithium secondary battery, and a lithium secondary battery including a positive electrode including the nickel-based active material. Background technique [0004] With the development of portable electronic devices, communication devices, etc., there is an urgent need to develop lithium secondary batteries with high energy density. However, such a lithium seco...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G53/00C01B35/10H01M4/485H01M4/505H01M4/525H01M10/0525
CPCC01G53/006C01B35/10H01M4/525H01M4/505H01M4/485H01M10/0525C01P2004/03H01M4/366H01M4/1391C01G53/50C01G53/42C01P2004/61C01P2004/50C01P2004/54Y02E60/10H01M10/052C01P2004/20C01P2004/32H01M2004/028
Inventor 尹弼相玄章鉐梁祐荣
Owner SAMSUNG SDI CO LTD