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Lithium manganate and preparation method and application thereof

A technology of lithium manganate and manganese metal, which is applied in the field of materials, can solve the problems of low capacity of lithium manganate, poor cycle performance, and a large amount of ammonia-containing wastewater, and achieve the effect of improving gram capacity and cycle stability

Active Publication Date: 2020-12-25
XTC NEW ENERGY MATERIALS(XIAMEN) LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to overcome the shortcomings of low capacity, poor cycle performance and a large amount of ammonia-containing waste water produced by the lithium manganate obtained by the existing method, and to provide a method that can obtain high capacity and cycle performance without generating waste water containing ammonia. Lithium manganate of ammonia wastewater and its preparation method and application

Method used

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  • Lithium manganate and preparation method and application thereof

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Effect test

Embodiment 1

[0028] Add sodium chloride into the reactor to prepare an aqueous sodium chloride solution with a conductivity of 2000uS / cm. Manganese powder, tantalum powder, and aluminum powder are mixed in a molar ratio of 1:0.001:0.003, and the resulting metal mixture, nitric acid, and high-purity water are simultaneously added to the above reactor in a molar ratio of 10:2:2 to carry out chemical corrosion crystallization reaction, Under normal pressure conditions, the ORP value of the reaction system is controlled at -400mv, the concentration of complexing agent is controlled at 5g / L, the conductivity is controlled at 2000uS / cm, and the stirring input power is controlled at 0.4kw / m 3 h, the metal ion concentration is controlled at 16g / L, the pH value is controlled at 10.5, and the reaction temperature is controlled at 50°C. In order to control the shape of the material, 5L / h nitrogen is introduced to control oxidation, and the material stays in the reactor for corrosion crystallization re...

Embodiment 2

[0032] Add sodium sulfate into the reactor to prepare an aqueous sodium sulfate solution with a conductivity of 200uS / cm. Manganese powder, tantalum powder, and titanium powder are mixed in a molar ratio of 1:0.001:0.003, and the resulting metal mixture, oxygen, and high-purity water are simultaneously added to the above reactor in a molar ratio of 10:2:2 to carry out chemical corrosion crystallization reaction, At the same time, 50g / L ammonium sulfate was added, and under normal pressure conditions, the ORP value of the reaction system was controlled at -100mv, the conductivity was controlled at 200uS / cm, and the stirring input power was controlled at 0.4kw / m 3 h, the metal ion concentration is controlled at 16g / L, the pH value is controlled at 10.5, and the reaction temperature is controlled at 30°C. In order to control the shape of the material, 5L / h nitrogen is introduced to control oxidation, and the material stays in the reactor for corrosion crystallization reaction The...

Embodiment 3

[0036] Add sodium nitrate into the reactor to prepare an aqueous sodium nitrate solution with a conductivity of 1000uS / cm. Manganese powder, tantalum powder, and niobium powder are mixed in a molar ratio of 1:0.001:0.003, and the resulting metal mixture, nitric acid, and high-purity water are simultaneously added to the above reactor in a molar ratio of 10:2:2 to carry out chemical corrosion crystallization reaction, At the same time, 5g / L ammonium sulfate was added, and under normal pressure conditions, the ORP value of the reaction system was controlled at -100mv, the concentration of complexing agent was controlled at 15g / L, the conductivity was controlled at 1000uS / cm, and the stirring input power Controlled at 0.4kw / m 3 h, the concentration of metal ions is controlled at 16g / L, the pH value is controlled at 10.5, and the reaction temperature is controlled at 30°C. In order to control the shape of the material, 5L / h nitrogen gas is introduced to control oxidation, and the ...

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Abstract

The invention belongs to the field of materials, and relates to lithium manganate and a preparation method and application thereof. The preparation method of the lithium manganate comprises the following steps: preparing metal salt into a metal salt solution with the conductivity of more than or equal to 200uS / cm, and then carrying out chemical corrosion crystallization reaction on manganese metalelementary substance and / or manganese metal oxide, a doping agent, an oxidant, water, an ammonia-containing solution and the metal salt solution under the conditions that the oxidation-reduction potential ORP value is less than or equal to -100mv, the complexing agent concentration is 3-50g / L and the conductivity is more than 200uS / cm; and sequentially carrying out magnetic separation, solid-liquid separation, washing and drying, mixing with a lithium source, and calcining. When the method provided by the invention is used for preparing the lithium manganate, no wastewater is generated in thedissolving and crystallizing process, and water is continuously consumed, so that the purpose of environmental friendliness can be achieved, and the obtained lithium manganate is used as a lithium ion battery positive electrode material, so that the gram capacity and the cycling stability of a lithium ion battery can be improved, and the method has a great industrial application prospect.

Description

technical field [0001] The invention belongs to the field of materials, and relates to a lithium manganate and its preparation method and application. Background technique [0002] Lithium-ion batteries are a new generation of green high-energy batteries. They have the advantages of high voltage, high energy density, good cycle performance, small self-discharge, no memory effect, and wide operating temperature range. They are widely used in various electronic equipment, especially power tools and electric The demand for lithium-ion batteries for scooters is increasing day by day. Lithium cobalt oxide material (LiCoO 2 ), multi-component materials, high-nickel materials, lithium manganese oxide materials (LiMn 2 o 4 ). Among them, lithium manganate is fully used in the 3C market due to its stable material and mature technology. LiMn 2 o 4 Considered as the most promising alternative LiCoO in the field of power tools 2 one of the materials. LiMn 2 o 4 As a cathode m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G45/12H01M4/505H01M10/0525
CPCC01G45/1242H01M4/505H01M10/0525C01P2004/03C01P2006/40Y02E60/10
Inventor 马跃飞李权洪礼训
Owner XTC NEW ENERGY MATERIALS(XIAMEN) LTD
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