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Lithium ion secondary battery positive electrode material and preparation method thereof

A technology for secondary batteries and positive electrode materials, applied in the field of positive electrode materials for lithium ion secondary batteries and their preparation, can solve the problems of insufficiently satisfying cycle performance, safe electrochemical performance, etc., achieve excellent cycle performance, and satisfy high discharge voltage. Platform, Effect of Protecting Integrity

Active Publication Date: 2015-12-02
QINGHAI TAIFENG XIANXING LITHIUM ENERGY TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] However, the above-mentioned patent application only emphasizes the doping of one or more elements and the surface distribution of doping elements or the inhibition of the formation of spinel-like phases, which cannot fully meet the requirements of the lithium secondary battery using lithium-cobalt composite oxide. Requirements for performance, safety, and especially electrochemical performance at high charge cut-off voltages

Method used

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  • Lithium ion secondary battery positive electrode material and preparation method thereof
  • Lithium ion secondary battery positive electrode material and preparation method thereof
  • Lithium ion secondary battery positive electrode material and preparation method thereof

Examples

Experimental program
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Embodiment 1

[0025] 1) Lithium, cobalt, magnesium, nickel, and manganese are carried out ball milling and mixing lithium carbonate, cobalt tetroxide, magnesium acetate, nickel acetate, and manganese acetate in a molar ratio of 1.20:0.98:0.005:0.005:0.01; The above materials are placed in a muffle furnace and calcined at 1000°C for 10 hours in an air atmosphere to obtain a single crystal lithium cobaltate doped with magnesium, nickel, and manganese in the bulk; the sintered materials are coarsely crushed and then crushed and sieved by a jet mill , and finally a primary doped lithium cobaltate material is obtained.

[0026] 2) According to the molar ratio of aluminum and cobalt of 0.015:1.00, aluminum isopropoxide and lithium cobaltate material doped once obtained in step 1) were wet mixed and evaporated to dryness with stirring. The evaporated material is placed in a muffle furnace and calcined at 750°C for 5 hours in an air atmosphere to obtain a single crystal lithium cobaltate doped with...

Embodiment 2

[0029] 1) Cobalt, magnesium, nickel, and manganese are prepared in a ratio of 0.97:0.005:0.005:0.02 by cobalt sulfate, magnesium sulfate, nickel sulfate, and manganese sulfate into hydroxide precipitates by co-precipitation method, and the It is placed in a muffle furnace at 550°C and sintered for 5 hours to make doped cobalt oxide. Lithium and cobalt are mixed with lithium carbonate and the prepared doped cobalt oxide in a molar ratio of 1.02:1 by ball milling. After the mixing is completed, the above materials are placed in a muffle furnace and calcined at 1000°C for 10 hours in an air atmosphere to obtain a single crystal lithium cobaltate doped with magnesium, nickel, and manganese in the bulk; the sintered materials are coarsely crushed and then air-flow Grind, crush and sieve to obtain a primary doped lithium cobalt oxide material.

[0030] 2) Place aluminum isopropoxide and lithium cobaltate material doped once in step 1) in ethanol solution according to the ratio of alu...

Embodiment 3-4

[0033] The method for preparing the positive electrode active material in Example 1 was followed, except that the aluminum isopropoxide was replaced by zirconium n-butoxide and magnesium acetate respectively. The prepared active material was tested for electrochemical performance. Use the prepared electrode sheet as the working electrode of the half-cell, metal lithium as the counter electrode, and use 1mol / LLiPF 6 / Ethylene carbonate (EC)-dimethyl carbonate (DMC) (mass ratio of EC and DMC 1:1) is used as electrolyte, is assembled into battery in glove box and carries out charge and discharge test to its battery, and the voltage range is 3.0-4.6V, charge and discharge current density is 0.2C.

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Abstract

The invention discloses a lithium ion secondary battery positive electrode material and a preparation method thereof. Doping of a lithium secondary battery positive electrode active substance is carried out by virtue of the synergistic effect among specific elements so as to realize simultaneous protection for a lithium-oxygen layer and a transitional metal-oxygen layer in a lithium cobalt oxide layered structure. By virtue of the optimal design of a secondary sintering technology, gradient doping or wrapping of the specific elements can be realized, so that the structural stability of large-particle lithium cobalt oxide of the material in a circulating process, particularly under a high-voltage condition, is better protected, and more excellent electrochemical performance is obtained; therefore, the lithium ion secondary battery positive electrode material can simultaneously meet the requirements on a high-discharge-voltage platform, high capacity and good circulating performance.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and relates to a lithium ion secondary battery cathode material and a preparation method thereof. Background technique [0002] Lithium-ion batteries have been widely used in notebooks, cameras and other products because of their advantages such as high energy density, long cycle life and safety. In recent years, with the portability of digital electronic products and the development of technology, people have put forward higher demands on the energy density of batteries. At present, the commonly used positive electrode active materials for lithium ion secondary batteries include lithium cobaltate, ternary, lithium manganate and lithium nickel manganese oxide and other lithium and transition metal composite oxides. Among them, the theoretical capacity of lithium cobalt oxide is 274mAhg -1 , when charging and discharging at 3.0-4.2V, about half of the lithium ions can be intercalat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/525H01M4/131H01M4/1391
CPCH01M4/131H01M4/1391H01M4/525H01M2004/028H01M2220/30Y02E60/10
Inventor 申兰耀徐世国武斌李淼张继泉周恒辉杨新河
Owner QINGHAI TAIFENG XIANXING LITHIUM ENERGY TECH CO LTD
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