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Vanadium-doped Ni-Co-Mn lithium ion battery positive electrode material

A nickel-cobalt-manganese-lithium, ion battery technology, applied in battery electrodes, secondary batteries, nanotechnology for materials and surface science, etc., can solve the imbalance between discharge specific capacity and conductivity, uneven distribution of doping elements, Problems such as low discharge specific capacity, to achieve the effect of providing discharge specific capacity, high mechanical strength, and providing electrical conductivity

Inactive Publication Date: 2018-03-13
JINGMEN GEM NEW MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In view of this, the main purpose of the present invention is to provide a kind of vanadium-doped nickel-cobalt-manganese lithium-ion battery positive electrode material, which solves the problems of low electrical conductivity and low discharge specific capacity of existing positive electrode materials; the purpose of the present invention is also to provide The preparation method of the positive electrode material, which solves the problem of uneven distribution of doping elements in the prior art, which leads to the imbalance of discharge specific capacity and electrical conductivity

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Preparation of LiNi 0.98 co 0.01 mn 1 / 150 V 0.002 o 2 Cathode material;

[0030] Step 1: Weigh the polycrystalline nickel-cobalt-manganese composite precursor, the single-crystal nickel-cobalt-manganese composite precursor, and a certain amount of nano-scale Vanadium pentoxide (V 2 o 5 ) and lithium nitrate (LiNO 3 ); Among them, lithium nitrate (LiNO 3 ) to the sum of nickel, cobalt and manganese moles is 1:0.997; the weighing amount of nano vanadium pentoxide is 0.002% of the sum of nickel, cobalt and manganese moles;

[0031] Step 2, the single-crystal nickel-cobalt-manganese composite precursor in step 1 and nanoscale V 2 o 5 Adding to an ultra-high speed mixer with a rotating speed of 10000r / min for mixing to obtain the first mixture;

[0032] Step 3, the first mixture obtained in step 2 and the polycrystalline nickel-cobalt-manganese composite precursor in step 1 and lithium nitrate (LiNO 3 ) into a high-speed mixer with a rotation speed of 3000r / min f...

Embodiment 2

[0036] Preparation of LiNi 0.98 co 0.01 mn 1 / 150 V 0.002 o 2 Cathode material;

[0037] Step 1, according to the mass ratio of 2:1, weigh the polycrystalline nickel-cobalt-manganese composite precursor, the single-crystal nickel-cobalt-manganese composite precursor, and a certain amount of nano-scale Vanadium pentoxide (V 2 o 5 ) and lithium carbonate (Li 2 CO 3 ); Among them, lithium carbonate (Li 2 CO 3) to the sum of nickel, cobalt, and manganese moles is 1:0.92; the weighing amount of nano-scale vanadium pentoxide is 0.002% of the sum of nickel, cobalt, and manganese moles;

[0038] Step 2, the single-crystal nickel-cobalt-manganese composite precursor in step 1 and nanoscale V 2 o 5 Adding to an ultra-high-speed mixer with a rotation speed of 20000r / min for mixing to obtain the first mixture;

[0039] Step 3, the first mixture obtained in step 2 and the polycrystalline nickel-cobalt-manganese composite precursor in step 1 and lithium carbonate (Li 2 CO 3 ) ...

Embodiment 3

[0042] Preparation of LiNi 0.98 co 0.01 mn 1 / 150 V 0.002 o 2 Cathode material;

[0043] Step 1, weigh the polycrystalline nickel-cobalt-manganese composite precursor, the single-crystal nickel-cobalt-manganese composite precursor and a certain amount of nano-scale Vanadium pentoxide (V 2 o 5 ) and lithium hydroxide (LiOH); wherein, the ratio of lithium hydroxide (LiOH) to the sum of nickel, cobalt, and manganese molar weights is 1:0.997; the weighing amount of nano-scale vanadium pentoxide is nickel, cobalt, and manganese 0.002% of the sum of moles;

[0044] Step 2, the single-crystal nickel-cobalt-manganese composite precursor in step 1 and nanoscale V 2 o 5 Adding to an ultra-high speed mixer with a rotating speed of 15000r / min for mixing to obtain the first mixture;

[0045] Step 3, adding the first mixture obtained in step 2 to the polycrystalline nickel-cobalt-manganese composite precursor and lithium hydroxide (LiOH) in step 1 into a high-speed mixer with a rot...

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Abstract

The invention discloses a vanadium-doped Ni-Co-Mn lithium ion battery positive electrode material and a preparation method thereof. The molecular formula of the vanadium-doped Ni-Co-Mn lithium ion battery positive electrode material is LiNi<x>Co<y>Mn<z>VO<2>, wherein a is more than or equal to 1 but less than or equal to 1.2, x is more than or equal to 0.3 but less than or equal to 0.98, y is more than or equal to 0.01 but less than or equal to 0.6, z is more than or equal to 0.001 but less than or equal to 0.6, b is equal to 4 / 5-a / 5-3x / 5-3y / 5-3z / 5, and b is more than or equal to 0.00001but less than or equal to 0.2. A single-crystal Ni-Co-Mn composite precursor and a vanadium compound are mixed in advance at an ultrahigh speed, a mixture of the single-crystal Ni-Co-Mn precursor andthe vanadium compound and a conventional poly-silicon Ni-Co-Mn precursor are mixed at a high speed, so that a mixing effect is improved; and since the single-crystal composite precursor is high in mechanical strength, can be mixed at an ultrahigh speed and cannot be broken, meanwhile, the single-crystal composite precursor simultaneously can have an effect of touching a medium, the vanadium compound is fully dispersed, and a doping element and a main element are fully mixed.

Description

technical field [0001] The invention belongs to the technical field of battery materials, and in particular relates to a vanadium-doped nickel-cobalt-manganese lithium-ion battery cathode material and a preparation method thereof. Background technique [0002] Lithium nickel cobalt manganese (LNCA) ion battery cathode material is widely used in IT products and new energy vehicles due to its high energy density and relatively low price, but pure nickel cobalt lithium manganese oxide is a semiconductor material, and its electronic conductivity The rate is very low; and the conduction of lithium ions is also very resisted by the transmission channel, resulting in a conductivity of only 10 -9 -10 -7 S / cm; while the conductivity of the positive electrode material directly affects the charging time of the IT product battery and the high-rate discharge performance of the power battery. With the increasing requirements for fast charging and discharging of lithium-ion batteries, it ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/505H01M4/525H01M4/62H01M10/0525B82Y30/00
CPCB82Y30/00H01M4/362H01M4/505H01M4/525H01M4/626H01M10/0525Y02E60/10
Inventor 许开华王家良张云河乐绪清
Owner JINGMEN GEM NEW MATERIAL
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