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Nb-doped Ni-Co-Mn-Li ion battery positive electrode material

A nickel-cobalt-manganese-lithium, ion battery technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of unbalanced discharge specific capacity and conductivity, uneven distribution of doping elements, low discharge specific capacity, etc. Provide discharge specific capacity, high mechanical strength, and provide the effect of electrical conductivity

Inactive Publication Date: 2018-03-09
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 niobium-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 Nb 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 Niobium pentoxide (Nb 2 o 5 ) and lithium nitrate (LiNO 3 ); Among them, lithium nitrate (LiNO 3 ) to the sum of the molar amounts of nickel, cobalt, and manganese is 1:0.997; the weighing amount of nano-level niobium pentoxide is 0.002% of the sum of the molar amounts of nickel, cobalt, and manganese;

[0031] Step 2, the single crystal nickel-cobalt-manganese composite precursor in step 1 and nanoscale Nb 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 mix...

Embodiment 2

[0036] Preparation of LiNi 0.98 co 0.01 mn 1 / 150 Nb 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 Niobium pentoxide (Nb 2 o 5 ) and lithium carbonate (Li 2 CO 3 ); Among them, lithium carbonate (Li 2 CO3 ) to the sum of nickel, cobalt, and manganese moles is 1:0.92; the weighing amount of nano-level niobium 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 Nb 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 Nb 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 Niobium pentoxide (Nb 2 o 5 ) and lithium hydroxide (LiOH); wherein, the ratio of lithium hydroxide (LiOH) to the sum of the moles of nickel, cobalt, and manganese is 1:0.997; the weighing amount of nano-level niobium 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 Nb 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, the polycrystalline nickel-cobalt-manganese composite precursor and lithium hydroxide (LiOH) in step 1 to a high-speed mixer with a rotatio...

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Abstract

The invention discloses a Nb-doped Ni-Co-Mn-Li ion battery positive electrode material and a preparation method thereof. The chemical formula of the Nb-doped Ni-Co-Mn-Li ion battery positive electrodematerial is LiaNixCoyMnzNbbO2, wherein 1<=a<=1.2, 0.3<=x<=0.98, 0.01<=y<=0.6, 0.001<=z<=0.6, b=4 / 5-a / 5-3x / 5-3y / 5-3z / 5, and 0.00001<=b<=0.2. According to the Nb-doped Ni-Co-Mn-Li ion battery positiveelectrode material, monocrystalline Co / Mn composite precursor and Nb compound are premixed at ultrahigh speed, the mixture of the monocrystalline Co / Mn composite precursor and the Nb compound are mixed at high speed with common polycrystalline Ni / Co / Mn precursor to improve the mixed effects; due to the high mechanical strength, the crystalline composite precursor can be mixed at ultrahigh speed and avoid being shattered; meanwhile, the monocrystalline composite precursor can play the role of collision medium to fully scatter the Nb compound and accordingly to fully mix doping elements with major elements.

Description

technical field [0001] The invention belongs to the technical field of battery materials, and in particular relates to a niobium-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 i...

Claims

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Application Information

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IPC IPC(8): H01M4/505H01M4/525H01M10/0525
CPCH01M4/505H01M4/525H01M10/0525Y02E60/10
Inventor 许开华王家良张云河乐绪清
Owner JINGMEN GEM NEW MATERIAL
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