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Polyhedron-rich composite phase precursor, preparation method thereof and lithium-rich positive electrode material

A cathode material and polyhedron technology, which is applied in the field of lithium-rich cathode materials to achieve the effects of easy industrialization, short synthesis period, cheap and controllable price

Pending Publication Date: 2022-01-11
NINGBO RONBAY LITHIUM BATTERY MATERIAL CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] However, the above-mentioned patents inevitably increase the production difficulty, control precision, and industrial production cost while improving the performance of the matrix.

Method used

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  • Polyhedron-rich composite phase precursor, preparation method thereof and lithium-rich positive electrode material
  • Polyhedron-rich composite phase precursor, preparation method thereof and lithium-rich positive electrode material
  • Polyhedron-rich composite phase precursor, preparation method thereof and lithium-rich positive electrode material

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preparation example Construction

[0049] The present invention also provides a method for preparing a polyhedron-rich composite phase precursor, comprising the following steps:

[0050] A) preparing metal salt solution;

[0051] B) mixing one or more of oxalic acid and oxalate with carbonate and the metal salt solution, and performing a co-precipitation reaction to obtain a polyhedron-rich secondary spherical composite phase precursor;

[0052] The molar ratio of the oxalate in one or more of the oxalic acid and the oxalate to the carbonate in the carbonate is (0.03-0.3):1, and the pH of the co-precipitation reaction is 7.3-8.8.

[0053] The present invention first prepares a metal salt solution, and the metal salt is selected from nickel salt, cobalt salt and manganese salt, or, also includes one of titanium salt, zirconium salt, chromium salt, iron salt, aluminum salt, magnesium salt and vanadium salt one or more species.

[0054] The nickel salt is selected from one or more of nickel sulfate, nickel nitra...

Embodiment 1

[0078] Configure mixed salt solution A of nickel sulfate (1 / 3mol / L), cobalt sulfate (1 / 3mol / L), manganese sulfate (4 / 3mol / L), and sodium carbonate (2mol / L), oxalic acid (0.2mol / L) L) mixed alkali solution B, put solutions A and B into the reaction kettle at the same time, keep the reaction temperature at 50°C, pH=8.5, and stir at 800rpm, after reacting for 6h, filter the mixed solution in the kettle with suction, wash, and dry at 120°C Dry for 12 hours to obtain a composite precursor; mix the composite precursor and lithium hydroxide monohydrate evenly in a certain stoichiometric ratio, place it in a muffle furnace and sinter at 850°C for 12 hours to obtain a lithium-rich positive electrode Li 1.2 Ni 0.13 co 0.13 mn 0.54 o 2 . see figure 2 , figure 2 For the SEM figure of the composite precursor prepared in embodiment 1, by figure 2 It can be seen that the matrix prepared by this method is significantly different from the ordinary smooth carbonate secondary sphere ma...

Embodiment 2

[0080] Configure mixed salt solution A of nickel sulfate (0.5mol / L), cobalt sulfate (1 / 6mol / L), manganese sulfate (4 / 3mol / L), and sodium carbonate (2mol / L), oxalic acid (0.05mol / L ), sodium oxalate (0.1mol / L) mixed alkali solution B, put solutions A and B into the reaction kettle at the same time, keep the reaction temperature at 50°C, pH=8.5, stirring speed at 800rpm, after reacting for 6 hours, put the mixed solution in the kettle Suction filtration, washing, and drying at 120°C for 12 hours to obtain a composite precursor; mix the composite precursor with lithium hydroxide monohydrate in a certain stoichiometric ratio, place it in a muffle furnace and sinter at 850°C for 12 hours to obtain a lithium-rich positive electrode Li 1.2 Ni 0.2 co 0.067 mn 0.54 o 2 .

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Abstract

The invention provides a polyhedron-rich composite phase precursor. The composite phase precursor provided by the invention is a polyhedron-rich secondary spherical particle, a main phase on an XRD spectrogram is a carbonate phase, and a diffraction peak exists when 2 theta is 18-19.5 degrees; and the cycle performance of a lithium-rich positive electrode prepared on the basis of the polyhedron-rich composite phase precursor taking carbonate as the main phase is obviously superior to that of the lithium-rich positive electrode prepared on the basis of a pure-phase carbonate matrix. The synthesis method provided by the invention is simple, process parameters are easy to control, the synthesis period is short, and industrialization is easy to realize; and the used raw materials are low in price and controllable, so that the overall implementation cost is low.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to a polyhedron-rich composite phase precursor, a preparation method thereof, and a lithium-rich cathode material. Background technique [0002] The current level of energy density of power lithium-ion batteries still cannot eliminate consumers' anxiety about the range of electric vehicles. The energy density of lithium-rich cathodes is much higher than that of mass-produced ternary cathodes and lithium iron phosphate cathodes. Therefore, the development of lithium-rich cathodes with stable performance is expected to greatly improve the battery life of electric vehicles. At the same time, this material is also expected to be used in some Specific capacity demand scenarios. The current mainstream lithium-rich cathode production process is similar to that of the ternary cathode, that is, the precursor is first prepared by coprecipitation, and then mixed with...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G53/00C01G45/00C01G45/12H01M4/48H01M4/485H01M4/50H01M4/505H01M4/52H01M4/525H01M10/0525
CPCC01G53/00C01G45/00C01G53/50C01G45/1228H01M4/483H01M4/485H01M4/502H01M4/505H01M4/523H01M4/525H01M10/0525H01M2004/028C01P2004/32C01P2004/45C01P2004/61C01P2004/62C01P2006/40C01P2006/12C01P2006/11Y02E60/10
Inventor 董亮辰钱云龙刘瑞刘永鹏严旭丰陈宇冯道言李琮熙刘相烈
Owner NINGBO RONBAY LITHIUM BATTERY MATERIAL CO LTD
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