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Preparation method of high-specific-capacity lithium-rich anode material

A lithium-rich positive electrode material with high specific capacity technology, applied in battery electrodes, electrical components, electrochemical generators, etc., can solve the problems of low discharge specific capacity, unstable cycle performance, complex preparation process, etc., and achieve large specific surface area , easy mass production, and simple synthesis steps

Inactive Publication Date: 2014-07-30
BEIJING INSTITUTE OF TECHNOLOGYGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to provide a method for preparing a lithium-rich cathode material with a high specific capacity in order to solve the problems of unstable cycle performance, complex preparation process and low discharge specific capacity of the existing layered lithium-rich cathode materials

Method used

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  • Preparation method of high-specific-capacity lithium-rich anode material
  • Preparation method of high-specific-capacity lithium-rich anode material
  • Preparation method of high-specific-capacity lithium-rich anode material

Examples

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Embodiment 1

[0022] A method for preparing a high-capacity lithium-rich positive electrode material, comprising dissolving manganese acetate, nickel acetate, cobalt acetate, and lithium acetate at a stoichiometric ratio of 0.54:0.13:0.13:1.26 (because the lithium element is volatile during the calcination process, an excess of 5% is required) In ethanol, stir to obtain a homogeneously mixed acetate solution. The solution was heated in a water bath at 80°C, and evaporated with electromagnetic stirring until the mixed liquid appeared as a purple-red viscous colloid, and placed in a drying oven at 80°C for 12 hours to obtain a precursor powder. Grind the dried mixture into powder, place it in a high-temperature furnace for calcination, and raise the temperature to 500° C. at a rate of 5° C. / min. The holding time is 5 hours. After cooling, drying and grinding, the temperature was raised at a heating rate of 5°C / min, and calcined at 850°C, and the holding time was 10h. After sintering, it was ...

Embodiment 2

[0028]A method for preparing a lithium-rich cathode material with a high specific capacity, comprising dissolving manganese acetate, nickel acetate, cobalt acetate and lithium acetate in deionized water at a stoichiometric ratio of 0.54:0.13:0.13:1.26, and stirring to obtain evenly mixed acetate solution. The solution was heated in a water bath at 80°C, and evaporated with electromagnetic stirring until the mixed liquid appeared as a purple-red viscous colloid, and placed in a drying oven at 80°C for 12 hours to obtain a precursor powder. Grind the dried mixture into powder, place it in a high-temperature furnace for calcination, and raise the temperature to 500° C. at a rate of 5° C. / min. The holding time is 5 hours. After cooling, drying and grinding, the temperature was raised at a heating rate of 5°C / min, and calcined at 850°C, and the holding time was 10h. After sintering, it was cooled down to room temperature by furnace cooling, and the brown lithium-rich material Li w...

Embodiment 3

[0031] A method for preparing a lithium-rich cathode material with a high specific capacity, comprising dissolving manganese acetate, nickel acetate, cobalt acetate and lithium acetate in ethanol at a stoichiometric ratio of 0.54:0.13:0.13:1.26, and stirring to obtain a uniformly mixed acetate solution . The solution was heated in a water bath at 80°C, and evaporated with electromagnetic stirring until the mixed liquid was viscous in purple, and placed in a drying oven at 80°C for 12 hours to obtain a precursor powder. Grind the dried mixture into powder, place it in a high-temperature furnace for calcination, and raise the temperature to 500° C. at a rate of 5° C. / min. The holding time is 5 hours. After cooling, drying and grinding, the temperature is raised at a heating rate of 5°C / min, and calcined at 900°C, and the holding time is 10h. After sintering, it was cooled down to room temperature by furnace cooling, and the brown lithium-rich material Li was obtained by grindin...

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Abstract

The invention relates to a preparation method of a high-specific-capacity lithium-rich anode material, belongs to the field of chemical power source material preparation and lithium ion battery anode materials. The preparation method comprises the following steps of dissolving manganese acetate, nickel acetate, cobaltous acetate and lithium acetate in a solvent, stirring the manganese acetate, the nickel acetate, the cobaltous acetate and the lithium acetate so as to obtain an acetate solution which is uniformly mixed, carrying out magnetic stirring and evaporating under heating of a water bath until a mixing liquid is thick colloid, and placing the mixing liquid in a drying box to dry so as to obtain precursor powder; warming the dried precursor powder to calcine twice, and reducing to room temperature by adopting a furnace cooling manner so as to obtain a multi-element lithium-rich material Li1.2Mn0.54Ni0.13 Co0.13O2. A material prepared by the preparation method provided by the invention is high in bulk phase crystallinity, the grain diameter of a material is small, the distribution is uniform, a transition metal element proportion approaches to a theoretical value, a synthesis step is simple, the material is easy for mass production, synthesizing nondeterminacy factors in a process are less, the characteristics give the high specific capacity and the cycling stability for the material, and an electrochemical property of the material is excellent.

Description

technical field [0001] The invention relates to a method for preparing a lithium-rich positive electrode material with high specific capacity, and belongs to the fields of preparation of chemical power source materials and lithium ion battery positive electrode materials. Background technique [0002] With the development of science and technology, the requirements for energy storage equipment in electronic products, aerospace fields, electric vehicles and other fields are increasing day by day, and gradually tend to develop in the direction of high energy density, small size and long cycle life. Lithium-ion batteries meet the above characteristics. has been widely used. The composition of lithium-ion batteries mainly includes positive and negative electrode materials, separators, electrolytes, etc. Among all the material compositions, the positive electrode material occupies the core position, which directly affects the cost, capacity, cycle life, safety and other important...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/505H01M4/525
CPCH01M4/505H01M4/525H01M10/0525Y02E60/10
Inventor 严乙铭邓晨刘明龙甄树瑜
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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