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Cathode active material for lithium secondary batteries with high safety and method of preparing for the same and lithium secondary batteries comprising the same

一种阴极活性材料、锂蓄电池的技术，应用在用于材料和表面科学的纳米技术、锂蓄电池、电极制造等方向，能够解决导电性破坏等问题

Active Publication Date: 2010-11-10
SOLE SOLAR TECH KOREA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the need to apply a dry coating process to coat the surface of lithium nickel oxide secondary particles with lithium cobalt zirconium oxide, although its effect is significantly improved, the conductivity is destroyed

Method used

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  • Cathode active material for lithium secondary batteries with high safety and method of preparing for the same and lithium secondary batteries comprising the same
  • Cathode active material for lithium secondary batteries with high safety and method of preparing for the same and lithium secondary batteries comprising the same
  • Cathode active material for lithium secondary batteries with high safety and method of preparing for the same and lithium secondary batteries comprising the same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0067]

[0068] nickel sulfate (NiSO 4 ·6H 2 O), magnesium sulfate (MnSO 4 ·H 2 O) and cobalt sulfate (CoSO 4 ·7H 2 O) was dissolved in purified ion-exchanged water so that the molar ratio of nickel, cobalt and magnesium was 0.5:0.2:0.3, thereby preparing a metal solution. Separately, prepare sodium hydroxide and ammonia solutions.

[0069] Using a co-precipitation reactor at pH 11.2 and 400 rpm, the metal solution was supplied at a rate of 5 L / hr and the ammonia solution was supplied at a rate of 0.5 L / hr by a quantitative pump under an inert nitrogen atmosphere. Add sodium hydroxide solution intermittently, so that the solution in the reactor can maintain a stable pH of 11.2.

[0070] The reaction was carried out over 48 hours to obtain a slurry comprising metal composite hydroxides of regular size. A centrifugal separator type filter was used to wash and filter the slurry until the filtrate had a pH of 9.0 or lower, and then the obtained metal composite hydroxide p...

Embodiment 2

[0076] A cathode active material was prepared in the same manner as in Example 1, but barium titanate was set at 0.2 parts by weight based on 100 parts by weight of the core.

Embodiment 3

[0078] The cathode active material was prepared in the same manner as in Example 1, but in addition to barium titanate and titanium oxide to construct the shell, an additional 1.5 parts by weight of the average diameter D was added based on 100 parts by weight of the core. 50 150nm olivine-type lithium iron phosphate oxide.

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Abstract

A cathode active material for a lithium secondary battery includes a lithium metal oxide secondary particle core formed by agglomerating lithium metal oxide primary particles; and a shell formed by coating the secondary particle core with barium titanate and metal oxide. This cathode active material allows making a lithium secondary battery having improved safety, particularly in thermal stability and overcharging characteristics.

Description

technical field [0001] The present invention relates to a cathode active material for a lithium secondary battery having a high degree of safety, a method for producing the material, and a lithium secondary battery comprising the material. In particular, the present invention relates to a cathode active material capable of improving safety, particularly thermal stability and overcharge characteristics for use in lithium ion secondary batteries or lithium ion polymer batteries, and a method for preparing the material. Background technique [0002] With the rapid development of electronics, communication and computer industries, portable video cameras, mobile phones, notebook computers, etc. have been significantly developed. Therefore, the demand for lithium storage batteries as a power source for driving the portable electronic communication equipment is increasing day by day. In particular, research and exploration of lithium secondary batteries as environmentally friendly...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/48
CPCH01M4/5825H01M4/505C01G45/1242H01M4/131H01M4/485C04B35/62805C04B2235/5454C04B2235/3222Y02E60/122C04B35/62821C04B2235/3279C01P2004/84C04B2235/3203C04B35/62892C01G51/42H01M4/366B82Y30/00C01G23/006C01G53/42C01G53/50H01M4/525Y02T10/7011H01M10/052C01P2006/40C01G51/50C01P2006/11C01G45/1228C04B2235/3268C01P2004/04C04B2235/5436C04B2235/3275Y02E60/10H01M4/02H01M4/04H01M4/48H01M10/36Y02T10/70
Inventor 金成培金佑成许允祯高成泰洪智俊
Owner SOLE SOLAR TECH KOREA CO LTD
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