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Precursor with double-layer structure for lithium ion battery, positive electrode material and preparation method

A lithium-ion battery, double-layer structure technology, applied in battery electrodes, secondary batteries, structural parts, etc., can solve the problems of reducing material tap density, unfavorable material compaction density, etc., to improve stability and improve cycle stability. performance, and the effect of increasing the specific capacity

Active Publication Date: 2021-04-13
JINGMEN GEM NEW MATERIAL
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Problems solved by technology

However, when the internal packing is loose, certain pores will appear inside, which will reduce the tap density of the material, which is not conducive to improving the compacted density of the material. Therefore, in order to increase the compacted density of the material, when preparing the material, it should be within a certain Improve the packing density inside the material particles to a certain extent

Method used

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  • Precursor with double-layer structure for lithium ion battery, positive electrode material and preparation method
  • Precursor with double-layer structure for lithium ion battery, positive electrode material and preparation method
  • Precursor with double-layer structure for lithium ion battery, positive electrode material and preparation method

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preparation example Construction

[0026] The preparation method of the precursor for the lithium-ion battery of double-layer structure comprises the following steps:

[0027] (1) Mix soluble nickel salt, soluble cobalt salt, soluble manganese salt, and soluble M salt corresponding to doping element M according to the ratio of molar ratio Ni: Co: Mn: M to x: y: (1-x-y-a): a , to obtain the first mixed salt solution, wherein, 0.3<x<1, 0<y<0.7, 0<a≤0.05, and the doping element M is one or more of Mg, Ti, Y. The sum of the concentrations of nickel ions, cobalt ions, manganese ions and M ions in the first mixed salt solution is 1mol / L˜3mol / L. Soluble nickel salt is one or more of nickel sulfate, nickel chloride and nickel nitrate; soluble cobalt salt is one or more of cobalt sulfate, cobalt chloride and cobalt nitrate; soluble manganese salt is manganese sulfate, chlorine One or more of manganese chloride and manganese nitrate; the soluble M salt is one or more of sulfate, chloride, and nitrate.

[0028] (2) Mix ...

Embodiment 1

[0034] Mix the mixed solution of nickel sulfate and nickel nitrate, the mixed solution of cobalt sulfate and cobalt nitrate, the mixed solution of manganese nitrate and manganese sulfate, magnesium sulfate, Fully mixed with the mixed solution of magnesium nitrate to prepare the first mixed salt solution with a total concentration of metal ions of 3 mol / L.

[0035] Fully mix nickel sulfate, cobalt sulfate, manganese sulfate and zirconium sulfate solutions according to the ratio of molar ratio Ni:Co:Mn:Zr of 0.8:0.1:0.05:0.05 to make the second mixture with a total concentration of metal ions of 3mol / L saline solution.

[0036] Under the protection of an inert gas, the first mixed salt solution, the sodium hydroxide solution with a concentration of 5mol / L, and the ammonia water with a concentration of 8mol / L were respectively added to the reaction kettle containing the bottom liquid through a metering pump. The flow rate that the solution is added into the reaction kettle conta...

Embodiment 2

[0041] Fully mix nickel sulfate, cobalt sulfate, manganese sulfate, and titanium sulfate solutions according to the molar ratio Ni: Co: Mn: Ti of 0.9: 0.03: 0.02: 0.05 to make the first solution with a total concentration of metal ions of 1mol / L. Mix the salt solution.

[0042] Mix the mixed solution of nickel sulfate and nickel nitrate, the mixed solution of cobalt sulfate and cobalt nitrate, manganese nitrate and manganese sulfate according to the ratio of molar ratio Ni: Co: Mn: W: Al 0.9: 0.03: 0.02: 0.025: 0.025 solution, a mixed solution of tungsten sulfate and tungsten nitrate, and a mixed solution of aluminum sulfate and aluminum nitrate are thoroughly mixed to prepare a second mixed salt solution with a total concentration of metal ions of 1 mol / L.

[0043] Under the protection of an inert gas, the first mixed salt solution, the sodium hydroxide solution with a concentration of 3mol / L, and the ammonia water with a concentration of 6mol / L were respectively added to the...

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Abstract

The invention discloses a precursor with a double-layer structure for a lithium ion battery, a positive electrode material and a preparation method, which aim to prepare a product of which primary particles are closely stacked inside and loosely stacked outside by using different reaction conditions. The tap density of the particles is guaranteed through internal close packing, and the loose outer part can exert better specific capacity and rate capability, so that the specific capacity, the rate capability and the energy density of the material can be improved at the same time; different elements are doped inside and outside the material in a targeted manner, and meanwhile, the rate capability inside the material and the cycling stability outside the material are improved; a doping element is directly added in the coprecipitation reaction process, so that the doping element can be uniformly distributed in the surface layer of precursor particles at the atomic level, and the doping modification effect is fully exerted. By utilizing different structures inside and outside the particles and using different doping elements, the comprehensive performance of the layered ternary material can be effectively improved.

Description

technical field [0001] The invention belongs to the field of lithium battery materials, and in particular relates to a double-layer structure lithium ion battery precursor, positive electrode material and preparation method. Background technique [0002] Lithium-ion batteries (LIBs) have been widely used in portable electronics, electric vehicles, and energy storage systems due to their many advantages such as high energy density, low self-discharge, no memory effect, long cycle life, and low environmental pollution. In the current lithium-ion battery technology, the cathode material is the key component of the lithium-ion battery. It not only participates in the electrochemical reaction as an electrode material, but also acts as a lithium ion source, which largely determines the safety and performance of the battery. , cost and lifetime. [0003] Among the commonly used cathode materials for lithium-ion batteries, ternary materials have become a research hotspot in recent ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/485H01M4/505H01M4/525H01M10/0525C01G53/00C01B35/12
CPCH01M4/366H01M4/485H01M4/505H01M4/525H01M10/0525C01G53/006C01G53/50C01B35/128C01P2004/80C01P2006/40C01P2004/61Y02E60/10
Inventor 许开华张坤陈康李聪杨幸薛晓斐黎俊孙海波范亮姣
Owner JINGMEN GEM NEW MATERIAL
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