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Single-crystal ternary cathode material containing microelements

A positive electrode material and trace element technology, which is applied in the direction of polycrystalline material growth, single crystal growth, single crystal growth, etc., can solve the problems of particle pulverization, less side reactions, and large primary particles.

Inactive Publication Date: 2020-01-17
LONG POWER SYST SUZHOU
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, nickel-cobalt-lithium manganese oxide cathode material faces problems such as poor structural stability and rapid capacity decay during high-voltage cycling, which limits its commercial application.
[0004] Nickel-cobalt-manganese ternary cathode materials mainly include secondary spherical type and single crystal type. Among them, the secondary spherical type ternary positive electrode material is easily broken under high pressure due to poor structural firmness, and has many side reactions under high voltage. , the structure collapses, leading to safety problems such as air inflation, while the single crystal ternary cathode material has a small specific surface area, large primary particles, few side reactions, and high compaction density, which can improve the capacity of the material under high voltage and prolong the battery cycle life. ; However, after long-term use, cation mixing is prone to occur, Ni 2+ , Li + Occupy each other and hinder Li + transport and disrupt material crystal structures, and the Li + The transmission ability between the grain boundaries is poor, resulting in great harm to the cycle life and capacity of the material, the cycle efficiency of the single crystal ternary cathode material is reduced, and the particles appear pulverization

Method used

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  • Single-crystal ternary cathode material containing microelements
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  • Single-crystal ternary cathode material containing microelements

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Single-crystal nickel-cobalt-manganese cathode material LiNi compound doped and coated with trace elements 5 co 2 mn 3 (MgAl) z o 2 The preparation method comprises the following steps:

[0033] 1) Preparation of magnesium-doped single crystal ternary cathode material C: the 5 μm523 ternary precursor Ni 5 co 2 mn 3 (OH) 2 , Lithium carbonate and basic magnesium carbonate are mixed, and the ball mill is used for 8 hours to mix evenly, and sintered to obtain a magnesium-doped single crystal 523 ternary positive electrode material C; wherein lithium carbonate and the ternary precursor Ni 5 co 2 mn 3 (OH) 2 The molar ratio is 1.1, the mass of basic magnesium carbonate is 0.5% of the mass of the precursor, the sintering atmosphere is 40% oxygen, and the sintering temperature is 980°C*17h;

[0034] 2) Take 200g of single crystal C, add the corresponding aluminum phosphate to the single crystal C according to 2 / 1000, 5 / 1000, and 10 / 1000 of the mass of the single cry...

Embodiment 2

[0036] Single-crystal nickel-cobalt-manganese cathode material LiNi compound doped and coated with trace elements 6 co 2 mn 2 (AlMn) z o 2 The preparation method comprises the following steps:

[0037] 1) Preparation of aluminum-doped single crystal ternary cathode material E: the 4 μm622 ternary precursor Ni 6 co 2 mn 2 (OH) 2 , Lithium Hydroxide and Aluminum Oxide, mixed with ball mill for 8 hours, and then sintered to obtain aluminum-doped single crystal 622 ternary positive electrode material E; Lithium Hydroxide and ternary precursor Ni 6 co 2 mn 2 (OH) 2 The molar ratio is 1.08, the mass of alumina is 0.3% of the mass of the precursor, the sintering atmosphere is 60% oxygen, and the sintering temperature is 940°C*10h;

[0038]2) Take 200g single crystal E, add the corresponding manganese phosphate to single crystal E according to one thousandth, three thousandths, and five thousandths of the mass of single crystal E, mix them with single crystal E, use a ball ...

Embodiment 3

[0040] Single-crystal nickel-cobalt-manganese cathode material LiNi compound doped and coated with trace elements 7 co 1.5 mn 1.5 (YZr) z o 2 The preparation method comprises the following steps:

[0041] 1) Preparation of aluminum-doped single crystal ternary cathode material G: the 5 μm 71515 ternary precursor Ni 7 co 1.5 mn 1.5 (OH) 2 , lithium hydroxide and yttrium oxide were mixed, and mixed evenly by ball milling for 8 hours, and sintered to obtain yttrium-doped single crystal 71515 ternary positive electrode material G; wherein lithium hydroxide and ternary precursor Ni 7 co 1.5 mn 1.5 (OH) 2 The molar ratio is 1.09, the mass of yttrium oxide is 0.1% of the mass of the precursor, the sintering atmosphere is 80% oxygen, and the sintering temperature is 870°C*15h;

[0042] 2) Take 200g of single crystal G, take 2 / 1000, 5 / 1000, and 8 / 1000 of the mass of single crystal G, respectively take the corresponding zirconium phosphate and add it to single crystal E to mi...

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Abstract

The invention belongs to the field of lithium ion battery materials, and provides a single-crystal ternary cathode material containing microelements and a preparation method thereof. A general formulaof the cathode material is LiNixCoyMn1-x-y(M+N)zO2, wherein 0.3 <=x<=0.75, 0.15<=y<=0.3, 0<=z<=0.1, and the M and N elements are respectively at least one selected from the group consisting of Mg, Ti, Al, Zr, La, Y, W, Mn and Ba, and the average particle size of the single-crystal ternary cathode material is 3.0-8.0 [mu]m. According to the cathode material, through compound doping and coating ofone or more of microelement compounds, lithium-nickel disordering of a ternary cathode can be effectively reduced, so that the cycle performance, discharge voltage and rate performance of the materialcan be further improved, and the advantages of high charging voltage and a high compaction density of the single-crystal ternary material are maintained.

Description

technical field [0001] The present invention relates to the technical field of lithium-ion batteries, more specifically, to a high-voltage single-crystal nickel-cobalt-lithium-manganese-oxide positive electrode material containing trace elements, in particular to a high-voltage single-crystal nickel-cobalt lithium-manganese oxide positive electrode doped and coated with trace elements Materials and their preparation methods. Background technique [0002] Lithium-ion battery is a new type of green power source, which has the advantages of high specific energy, small size, and strong cycle performance. Lithium-ion commercialized positive electrode materials mainly include lithium cobaltate, lithium manganate, lithium iron phosphate and nickel-cobalt-manganese Yuan cathode material. [0003] Among them, the nickel-cobalt lithium manganate ternary cathode material is favored by people because of its high energy density, especially the high-nickel-based ternary material, whose s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C30B1/10C30B29/22H01M4/485H01M4/505H01M4/525
CPCC30B1/10C30B29/22H01M4/485H01M4/505H01M4/525Y02E60/10
Inventor 卢定民徐伯雄郑风云同小博
Owner LONG POWER SYST SUZHOU
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