Cation-anion codoped and modified layered lithium-rich anode material and preparation method thereof

A lithium-rich cathode material, anion and cation technology, applied in battery electrodes, electrical components, electrochemical generators, etc., can solve the problems of high discharge platform, poor rate performance of lithium-rich cathode materials, low initial Coulombic efficiency, etc., and achieve stability Material structure, improvement of first-time efficiency, safe and effective effect of battery

Inactive Publication Date: 2018-01-12
SHANGHAI UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] One of the purposes of the present invention is to overcome the deficiencies in the development of existing positive electrode materials, and propose a layered lithium-rich positive electrode material for lithium ion batteries modified by anion and cation co-doping. The positive electrode material of the present invention has uniform particles, high crystallinity, and high discharge ratio. High capacity, high discharge platform, and good cycle performance overcome the shortcomings of poor rate performance and low initial Coulombic efficiency of lithium-rich cathode materials

Method used

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  • Cation-anion codoped and modified layered lithium-rich anode material and preparation method thereof
  • Cation-anion codoped and modified layered lithium-rich anode material and preparation method thereof
  • Cation-anion codoped and modified layered lithium-rich anode material and preparation method thereof

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Embodiment 1

[0025] An anion and cation Cd 2+ , S 2- The preparation method of the co-doped lithium-rich positive electrode material, the specific embodiment is as follows:

[0026] A. Weigh quantitative nickel sulfate (NiSO 4 )6.6 g, manganese sulfate (MnSO 4 ) 12.7g was dissolved in deionized water to obtain a nickel-manganese sulfate solution, wherein the Ni:Mn molar ratio in the nickel-cobalt-manganese sulfate solution was 0.2:0.6;

[0027] B. Configure a NaOH solution with a concentration of 4%, adjust the pH value of the above solution to 9, and slowly add the NaOH solution to the above nickel-manganese sulfate solution under the protection of nitrogen, keep the temperature in a water bath at 80°C, and precipitate the reaction 6h, manganese and nickel precipitates were obtained, filtered, washed, and dried to obtain a certain proportion of nickel-manganese precursors;

[0028] C. Lithium carbonate powder and the above precursor are mixed according to the molar ratio of lithium ...

Embodiment 2

[0033] A. Weigh quantitative nickel sulfate (NiSO 4 ), cobalt sulfate (CoSO 4 ), manganese sulfate (MnSO 4 ) was dissolved in deionized water to obtain a nickel-cobalt-manganese sulfate solution, wherein the Ni:Co:Mn molar ratio in the nickel-cobalt-manganese sulfate solution was 0.54:0.13:0.13;

[0034] B. Configure a NaOH solution with a concentration of 4%, adjust the pH value of the above solution to 9, and slowly add the NaOH solution to the above nickel-cobalt-manganese sulfate solution under the protection of nitrogen, keep the temperature in a water bath at 80°C, and precipitate React for 6 hours to obtain manganese, nickel and cobalt precipitates, filter, wash and dry to obtain a certain proportion of nickel-cobalt-manganese precursors;

[0035] C. Lithium carbonate powder and the above precursor are mixed according to the molar ratio of lithium metal to the total metal in the precursor is 1.2:1, then 1% cadmium sulfide powder is added and mixed, ground for 30 minut...

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Abstract

The invention discloses a cation-anion codoped and modified layered lithium-rich anode material and a preparation method of the material. A chemical general formula of the anode material is Li[Li0.2MCdx]O2-ySy (M is one or a combination of any of Ni, Mn and Co); x is greater than or equal to 0 and less than or equal to 0.1; and y is greater than or equal to 0 and less than or equal to 0.1. The method is simple to operate; the obtained lithium-rich anode material has better cycling stability and rate discharge performance; a capacity retention rate is still 95% after 100 cycles of circulation at 1C heavy current density.

Description

technical field [0001] The invention relates to an anion-cation co-doped and modified layered lithium-rich positive electrode material and a preparation method thereof, belonging to the technical field of preparation of lithium-ion battery materials. Background technique [0002] With the promotion of lithium-ion batteries to the power battery market, higher and higher requirements are put forward for the energy density and power density of lithium-ion batteries. Among them, the most widely used commercial material is LiCoO 2 , but the material contains high-priced Co elements, making its cost much higher than that of negative electrode materials, which in turn leads to higher manufacturing costs of lithium-ion batteries. In addition, it will cause greater harm to the environment, which is to a large extent Restricted the development of lithium-ion batteries, especially in the promotion of electric vehicles. Lithium iron phosphate, as a currently commercialized product, ha...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/485H01M4/505H01M4/525H01M4/58H01M10/0525
CPCY02E60/10
Inventor 陈国荣施利毅张登松安娟
Owner SHANGHAI UNIV
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