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Preparation method of high-rate nickel-magnesium composite doped lithium manganate positive electrode material

A cathode material, lithium heteromanganate technology, applied in the field of high-rate nickel-magnesium composite doped lithium manganate cathode material, can solve the problems of high reaction temperature, complex processing technology, long reaction time and the like

Pending Publication Date: 2019-03-01
YUNNAN MINZU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The above methods all have defects such as complex processing technology, long reaction time, and high reaction temperature.

Method used

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  • Preparation method of high-rate nickel-magnesium composite doped lithium manganate positive electrode material
  • Preparation method of high-rate nickel-magnesium composite doped lithium manganate positive electrode material
  • Preparation method of high-rate nickel-magnesium composite doped lithium manganate positive electrode material

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Embodiment 1

[0033] Example 1: Synthesis of nickel-magnesium-doped lithium manganate cathode material of the present invention

[0034] The implementation steps of this embodiment are as follows:

[0035] This synthetic method is lithium source with lithium carbonate, manganese carbonate is manganese source, nickel acetate is nickel dopant and magnesium acetate is magnesium dopant, according to stoichiometric ratio Li: Mn: Ni: Mg =1: 1.89: 0.03: 0.08 ratio of raw materials, adding 5wt.% citric acid of the total mass of raw materials as fuel. It is characterized in that the steps of the method are as follows:

[0036] A. Preparation of dopant dispersion

[0037] Weigh solid nickel acetate and magnesium acetate according to the stoichiometric ratio Li:Mn:Ni:Mg =1:1.89:0.03:0.08, then accurately weigh the total mass of nickel acetate and magnesium acetate in grams, and deionized water in milliliters According to the mass-to-volume ratio of 1:6, nickel acetate and magnesium acetate are adde...

Embodiment 2

[0044] Embodiment 2: Synthesis of nickel and magnesium doped lithium manganate cathode material of the present invention

[0045] The implementation steps of this embodiment are as follows:

[0046] With lithium carbonate as the lithium source, manganese carbonate as the manganese source, nickel acetate as the nickel dopant and magnesium acetate as the magnesium dopant, according to the stoichiometric ratio Li: Mn: Ni: Mg =1: 1.87: 0.05: 0.08 ratio Raw materials, add 5 wt.% citric acid of the total mass of raw materials as fuel. It is characterized in that the steps of the method are as follows:

[0047] A. Preparation of dopant dispersion

[0048] Weigh solid nickel acetate and magnesium acetate according to the stoichiometric ratio Li:Mn:Ni:Mg =1:1.87:0.05:0.08, then accurately weigh the total mass of nickel acetate and magnesium acetate in grams, and deionized water in milliliters According to the mass-to-volume ratio of 1:7, nickel acetate and magnesium acetate are adde...

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Abstract

The invention relates to a preparation method of a high-rate nickel-magnesium composite doped spinel type lithium manganate LiNixMg0.08Mn1.92-xO4 (x being equal to 0.03-0.15) positive electrode material. The method concretely comprises the following steps: preparing dopant dispersion liquid, preparing fuel agent dispersion liquid, mixing, synthesizing the product, and the like; mechanically stirring uniformly to obtain reaction mixture slurry, then placing in a porcelain crucible, and then placing in a muffle furnace at a preset temperature of 500 DEG C; carrying out a combustion reaction for1h in an air atmosphere, taking out and cooling in the air, grinding and then placing in the muffle furnace at 650 DEG C, roasting for 6h, taking out and cooling in the air, and grinding to obtain thenickel-magnesium co-doped spinel type lithium manganate positive electrode material. The rate performance of the nickel-magnesium co-doped spinel type lithium manganate positive electrode material synthesized by the method is obviously superior to that of a LiMg0.08Mn1.92O4 material prepared by other methods. The method adopts a solid-liquid water mixing system, so that the mechanical mixing timeis short; the reaction mixture slurry does not need to be dried, and is directly heated for a combustion reaction; the preparation method is simple and rapid, and the electrochemical performance is excellent.

Description

technical field [0001] The invention relates to a high-rate nickel-magnesium composite doped lithium manganate positive electrode material and the nickel-magnesium co-doped lithium manganate LiNi x Mg 0.08 mn 1.92-x o 4 The preparation method of the material belongs to the technical field of lithium ion battery cathode materials. Background technique [0002] Lithium-ion batteries (LIB) are widely used in electric and hybrid electric vehicles (EV / HEV) and also in energy storage systems (ESS). Spinel-type LiMn with three-dimensional crystal structure 2 o 4 Due to its advantages of high specific capacity, low cost, environmental friendliness and no memory effect, it has attracted extensive attention. However, spinel LiMn 2 o 4 There is a Jahn-Teller effect, which leads to rapid capacity decay during the charge-discharge cycle, especially at high temperature (≧55°C), which restricts its development. At present, in order to solve the spinel LiMn 2 o 4 The studies on...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/485H01M4/505H01M4/525H01M10/0525
CPCH01M4/362H01M4/485H01M4/505H01M4/525H01M10/0525Y02E60/10
Inventor 郭俊明于月向明武白红丽苏长伟刘晓芳段开娇
Owner YUNNAN MINZU UNIV