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Element co-doping modified ternary lithium ion battery cathode material, and preparation method thereof

A technology for lithium-ion batteries and positive electrode materials, which is applied in the field of element co-doping modified ternary lithium-ion battery positive electrode materials and its preparation, can solve problems such as lattice structure distortion, unproportional changes in unit cell parameters, and influence on material performance. Achieve the effects of inhibiting erosion, synergistic changes in unit cell parameters, and reducing the risk of collapse

Active Publication Date: 2017-02-15
QINGHAI TAIFENG XIANXING LITHIUM ENERGY TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Because lithium layers and transition metal layers are arranged alternately along the (111) crystal plane, a single Me 1 ions or Me with a radius close to that of transition metal ions 2 Ions will cause disproportionate changes in unit cell parameters, resulting in lattice structure distortion and affecting the performance of materials.

Method used

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  • Element co-doping modified ternary lithium ion battery cathode material, and preparation method thereof
  • Element co-doping modified ternary lithium ion battery cathode material, and preparation method thereof
  • Element co-doping modified ternary lithium ion battery cathode material, and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Weigh 50 g Ni 0.5 co 0.2 mn 0.3 (OH) 2 , 20.9212 g of lithium carbonate, 0.6754 g of zirconium dioxide, and 1.1115 g of boehmite were added together by ball milling in the mixing tank and mixed evenly. Then put the mixed material into the crucible and put it into the muffle furnace for high temperature sintering, using air atmosphere, sintering at 900°C for 10 h. The sintered block is broken to obtain a primary product uniformly doped with Al and Zr.

[0020] Weigh 0.7570g of aluminum isopropoxide and add it to 50mL of absolute ethanol at 60°C and stir at a constant temperature. After the aluminum isopropoxide is completely dissolved, add the primary product obtained in the previous step, continue stirring until the solvent is completely evaporated, and transfer to 110°C Dry in a C oven for 10 h, and then place in a muffle furnace for sintering at 700 ° C for 6 h. After sintering, the material is passed through a 300-mesh sieve to obtain a modified ternary material....

Embodiment 2

[0024] Weigh 50 g Ni 0.35 co 0.35 mn 0.30 (OH) 2 , 20.9212 g lithium carbonate, 1.7532 g zirconium sulfate tetrahydrate, and 1.8526 g aluminum sulfate octadecahydrate were added together by ball milling in the mixing tank and mixed evenly. Then put the mixed material into the crucible and put it into the muffle furnace for high temperature sintering, using air atmosphere, sintering at 1000°C for 10 h. The sintered block is broken to obtain a primary product uniformly doped with Al and Zr.

[0025]Then weigh 0.7099 g of tetrabutyl titanate and add it to 50 mL of absolute ethanol at 60°C and stir for 10 min at a constant temperature, then add the primary product obtained in the previous step, continue stirring until the solvent is completely evaporated to dryness, and transfer to an oven at 110°C Dry for 10 h, then place it in a muffle furnace for sintering at 850°C for 5 h, and pass the sintered material through a 300-mesh sieve to obtain the modified ternary material.

Embodiment 3

[0027] Weigh 0.6309 g of zirconium n-butoxide and 0.3785 g of aluminum isopropoxide into 100 mL of absolute ethanol, heat and stir at 60°C for 20 min, then add 50 g of Ni 0.35 co 0.35 mn 0.30 (OH) 2 , continue to stir and mix at a constant temperature until evaporated to dryness, and then place it in an oven at 100°C for 10 h. Get the dried material and 13.5624 g lithium hydroxide ball mill and mix evenly. After mixing, the above materials were placed in a high-temperature furnace for sintering at 950°C in an air atmosphere for 12 h. The sintered block is broken to obtain a primary product uniformly doped with Al and Zr.

[0028] The primary product obtained in the previous step was mixed with 0.3377 g of zirconia ball mill and placed in a muffle furnace for sintering at a sintering temperature of 900 °C and a sintering time of 4 h. After sintering, the material is passed through a 300-mesh sieve to obtain a modified ternary material.

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Abstract

The invention discloses an element co-doping modified ternary lithium ion battery cathode material, and a preparation method thereof. According to the preparation method, compounds of two kinds of metals Me<1> and Me<2> are respectively selected based on the difference of ion radiuses of lithium ion and transition metal ions in the lithium nickel cobalt manganese ternary material, and are subjected to high temperature sintering with a nickel cobalt manganese precursor, wherein the ion radius of the metal Me<1> ion is close to that of lithium ion, and the metal Me<1> ion is one or a mixture of ions selected from Zn2+ and Zr4+, the radius of the metal Me<2> ion is close to that of transition metal ion Co3+ or Mn4+, and the metal Me<2> is one or a mixture of ions selected from Al3+, V5+, and Ge4+; and then a primary product obtained via high temperature sintering is subjected to second cladding so as to obtain the element co-doping modified ternary lithium ion battery cathode material. The element co-doping modified ternary lithium ion battery cathode material is capable of achieving synergistic effects of two metal elements fully, and improving cycle performance of lithium ion batteries effectively.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and relates to an element co-doped modified ternary lithium ion battery positive electrode material and a preparation method. Background technique [0002] Lithium-nickel-cobalt-manganese ternary material has become a common positive electrode material for power batteries because of its high energy density, low cost and relatively reliable safety. Different from the lithium iron phosphate olivine structure, the lithium nickel cobalt manganese ternary material has a layered α-NaFeO 2 structure, belonging to R In the m space group, the cubic close-packing of oxygen ions forms the basic octahedral skeleton, and lithium ions and transition metal ions occupy the gaps of the oxygen octahedra, and are alternately arranged along the (111) crystal plane to form lithium layers and transition metal layers. [0003] Furthermore, Li in the ternary material + With a radius of 0.076 nm, in Co ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G53/00H01M4/36H01M4/505H01M4/525H01M4/62H01M10/0525
CPCC01G53/006C01P2004/03C01P2004/61C01P2006/40H01M4/366H01M4/505H01M4/525H01M4/62H01M10/0525Y02E60/10
Inventor 王欢欢黄震雷陈全彬韩坤明周恒辉
Owner QINGHAI TAIFENG XIANXING LITHIUM ENERGY TECH CO LTD
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