Zirconium-doped modified nickel cobalt manganese lithium oxide/lithium titanate composite cathode material

A technology of nickel-cobalt-manganese-lithium oxide and composite cathode materials, which is applied in electrode manufacturing, battery electrodes, electrode heat treatment, etc., can solve the problems of poor repeatability of nickel-cobalt-manganese-lithium oxide, and reduce production processes, improve rate performance and cycle performance. , the effect of improving the first Coulomb efficiency

Inactive Publication Date: 2017-09-26
HEFEI UNIV OF TECH +1
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  • Abstract
  • Description
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Problems solved by technology

[0006] The present invention aims to provide a zirconium-doped nickel-cobalt-manganese-manganese-lithium positive electrode material, on the basis of which is coated with lithium titanate. The technical problem to be solved is that the repeatability of the ternary layered positive electrode material nickel-cobalt-manganese-lithium oxide is poor and rate performance, while providing a zirconium-doped nickel-cobalt-manganese-lithium cathode material coated with lithium titanate with simple process, high safety and good stability

Method used

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  • Zirconium-doped modified nickel cobalt manganese lithium oxide/lithium titanate composite cathode material
  • Zirconium-doped modified nickel cobalt manganese lithium oxide/lithium titanate composite cathode material
  • Zirconium-doped modified nickel cobalt manganese lithium oxide/lithium titanate composite cathode material

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Embodiment 1

[0042] In this embodiment, the lithium-ion battery nickel-cobalt-manganese-lithium positive electrode material is prepared according to the following steps:

[0043] Take by weighing 0.536g lithium acetate, 0.409g manganese acetate, 0.276g cobalt acetate, be dissolved in the mixed solution of 10ml water and 50ml ethanol, be recorded as A solution, in order to make up for the loss of lithium source in the calcining process, lithium acetate is excessive 5%; Weigh 0.415g of nickel acetate and 0.138g of cobalt acetate and dissolve them in a mixed solution of 10ml of water and 50ml of ethanol, and record it as solution B; weigh 1.1649g of dihydrate oxalic acid, dissolve it in a mixed solution of 10ml of water and 50ml of ethanol, and record it as C solution. Add solution A to solution C dropwise to make it precipitate. After 10 minutes, pour solution B into solution C and react at room temperature for 5 hours. Then it was dried in an oven at 80°C for 12 hours, and ground to obtain...

Embodiment 2

[0046] In this example, the nickel oxide cobalt manganese lithium positive electrode material modified by zirconium doping for lithium ion battery is prepared according to the following steps:

[0047] a, take by weighing 0.536g lithium acetate, 0.409g manganese acetate, 0.276g cobalt acetate, dissolve in the mixed solution of 10ml water and 50ml ethanol, record as A solution, in order to make up for the loss of lithium source in the calcining process, lithium acetate is excessive 5 %; Weigh 0.415g of nickel acetate, 0.138g of cobalt acetate and dissolve in a mixed solution of 10ml of water and 50ml of ethanol, which is referred to as solution B; weigh 1.1649g of dihydrate oxalic acid, dissolve in a mixed solution of 10ml of water and 50ml of ethanol, Recorded as C solution. Add solution A to solution C dropwise to make it precipitate. After 10 minutes, pour solution B into solution C and react at room temperature for 5 hours. Then it was dried in an oven at 80°C for 12 hours...

Embodiment 3

[0052] In this example, the nickel oxide cobalt manganese lithium positive electrode material modified by zirconium doping for lithium ion battery is prepared according to the following steps:

[0053]Weigh 0.536g lithium acetate, 0.381g manganese acetate, 0.276g cobalt acetate, 0.091g zirconium nitrate, dissolve in the mixed solution of 10ml water and 50ml ethanol, and record it as solution A. In order to make up for the loss of lithium source in the calcining process, acetic acid Lithium excess 5%; Weigh 0.415g of nickel acetate and 0.138g of cobalt acetate and dissolve in a mixed solution of 10ml of water and 50ml of ethanol, and record it as solution B; Weigh out 1.1649g of dihydrate oxalic acid, dissolve in a mixture of 10ml of water and 50ml of ethanol solution, denoted as C solution. Add solution A to solution C dropwise to make it precipitate. After 10 minutes, pour solution B into solution C and react at room temperature for 5 hours. Then it was dried in an oven at 8...

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Abstract

The invention discloses a zirconium-doped modified nickel cobalt manganese lithium oxide/lithium titanate composite cathode material. According to the cathode material, a zirconium-doped modified nickel cobalt manganese lithium oxide cathode material is synthesized by a coprecipitation method at first, and then a trinary material is coated by a lithium titanate active electrode material. On one hand, electronic conductivity and ionic conductivity are improved, the output power density of a cell is improved, and further structure stability of the trinary material is improved; on the other hand, advantages of the two materials can be combined through coating; thus, the composite cathode material having better circulation, higher cyclicity and larger energy density is obtained.

Description

technical field [0001] The invention belongs to the field of positive electrode materials for lithium ion batteries, in particular to a zirconium-doped modified nickel oxide cobalt manganese lithium / lithium titanate composite positive electrode material. Background technique [0002] Lithium-ion batteries are a new generation of secondary batteries developed rapidly in the 1990s, and are widely used in small portable electronic communication products and electric vehicles. At present, the anode materials of lithium-ion batteries that have been industrialized mainly include lithium cobalt oxide, modified lithium manganese oxide, ternary materials, and lithium iron phosphate. Lithium cobalt oxide is mainly used in the field of small-scale high-energy-density lithium-ion batteries, but cobalt is highly toxic, scarce resources, expensive, and its overcharge safety performance is poor. Spinel-type lithium manganate has low specific capacity, and poor high-temperature cycle and s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/04H01M4/36H01M4/505H01M4/525
CPCH01M4/0416H01M4/0471H01M4/362H01M4/505H01M4/525Y02E60/10
Inventor 朱继平王娟严家伟王杰徐金鑫
Owner HEFEI UNIV OF TECH
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