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Tantalum doped nickel-cobalt-manganese lithium iron battery positive material

A nickel-cobalt-manganese-lithium, ion battery technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of imbalance between discharge specific capacity and conductivity, low conductivity, low discharge specific capacity, etc. Capacity, improved uniform distribution effect, high mechanical strength effect

Inactive Publication Date: 2018-03-20
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 tantalum-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 Ta 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 Tantalum pentoxide (Ta 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-scale tantalum 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 Ta 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 m...

Embodiment 2

[0036] Preparation of LiNi 0.98 co 0.01 mn 1 / 150 Ta 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 Tantalum pentoxide (Ta 2 o 5 ) and lithium carbonate (Li 2 CO 3 ); Among them, lithium carbonate (Li 2 CO3 ) to the sum of the molar amounts of nickel, cobalt, and manganese is 1:0.92; the weighing amount of nano-scale tantalum pentoxide is 0.002% of the sum of the molar amounts of nickel, cobalt, and manganese;

[0038] Step 2, the single crystal nickel-cobalt-manganese composite precursor in step 1 and nanoscale Ta 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 l...

Embodiment 3

[0042] Preparation of LiNi 0.98 co 0.01 mn 1 / 150 Ta 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 Tantalum pentoxide (Ta 2 o 5 ) and lithium hydroxide (LiOH); wherein, the ratio of lithium hydroxide (LiOH) to the sum of the molar amounts of nickel, cobalt, and manganese is 1:0.997; the weighing amount of nanoscale tantalum 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 Ta 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 ...

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Abstract

The invention discloses a tantalum doped nickel-cobalt-manganese lithium iron battery positive material and a preparation method thereof. The chemical expression of the tantalum doped nickel-cobalt-manganese-lithium iron battery positive material is LiaNixCoyMnzTabO2, wherein a is more than or equal to 1 and less than or equal to 1.2, x is more than or equal to 0.3 and less than or equal to 0.98,y is more than or equal to 0.01 and less than or equal to 0.6, z is more than or equal to 0.001 and less than or equal to 0.6, b equals to 4 / 5-a / 5-3x / 5-3y / 5-3z / 5, and b is more than or equal to 0.00001 and less than or equal to 0.2. According to the invention, a single crystal nickel-cobalt-manganese compound precursor and a tantalum compound are premixed at a superhigh speed, and the mixture of the single crystal nickel-cobalt-manganese compound precursor and the tantalum compound are mixed with a common poly-crystal nickel-cobalt-manganese precursor, so as to improve the mixing effect; sincea single crystal compound precursor is high in mechanical strength, superhigh-speed mixing can be adopted instead of breaking, and the single crystal compound precursor can play a role of a collisionmedium, so as to sufficiently scatter the tantalum compound and sufficiently mix doped elements and main elements.

Description

technical field [0001] The invention belongs to the technical field of battery materials, and in particular relates to a tantalum-doped nickel-cobalt-manganese lithium-ion battery positive electrode 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 bat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/505H01M4/525H01M4/62H01M10/0525
CPCH01M4/364H01M4/505H01M4/525H01M4/626H01M10/0525Y02E60/10
Inventor 许开华王家良张云河乐绪清
Owner JINGMEN GEM NEW MATERIAL
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