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Cobalt-free lithium-rich positive electrode material as well as preparation method and application thereof

A lithium-rich cathode material, lithium source technology, applied in the direction of positive electrodes, chemical instruments and methods, inorganic chemistry, etc., can solve the problems of low capacity and troublesome preparation, and achieve the effect of improving cycle performance

Active Publication Date: 2022-01-28
SVOLT ENERGY TECHNOLOGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the cycle stability is improved to a certain extent, the preparation is cumbersome and the capacity is not high

Method used

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  • Cobalt-free lithium-rich positive electrode material as well as preparation method and application thereof
  • Cobalt-free lithium-rich positive electrode material as well as preparation method and application thereof
  • Cobalt-free lithium-rich positive electrode material as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0052] This embodiment provides a cobalt-free lithium-rich positive electrode material whose chemical formula is , the positive electrode material through Ni 0.35 mn 0.65 (OH) 2 It is obtained by sintering after compounding with lithium carbonate, wherein the doping amount of Ti is 2000ppm, the coating amount of Zr is 2000ppm, and the coating amount of Al is 1500ppm;

[0053] Ni 0.35 mn 0.65 (OH) 2 The specific surface area a is 25m 2 / g, the tap density b is 1.55g / cm 3 , which looks like figure 1 The spherical particles shown are spherical particles obtained from flake-like primary particles, with a median particle size of 5.5 μm;

[0054] The specific surface area c of the cobalt-free lithium-rich cathode material is 1.5m 2 / g, the tap density d is 1.7g / cm 3 , which looks like figure 2 The spherical structure shown has a median particle size of 5.5 μm;

[0055] a / c+b / d=17.6.

[0056] The preparation method of the cobalt-free lithium-rich cathode material is as...

Embodiment 2

[0061] This embodiment provides a cobalt-free lithium-rich positive electrode material whose chemical formula is , the positive electrode material through Ni 0.25 mn 0.75 (OH) 2 It is obtained by sintering after compounding with lithium carbonate, wherein the doping amount of Al is 1500ppm, the coating amount of Zr is 2000ppm, and the coating amount of Ti is 2000ppm;

[0062] Ni 0.25 mn 0.75(OH) 2 The specific surface area a is 20m 2 / g, the tap density b is 1.5g / cm 3 ;

[0063] The specific surface area c of the cobalt-free lithium-rich cathode material is 5.0m 2 / g, the tap density d is 1.5g / cm 3 ;

[0064] a / c+b / d=5.

[0065] The preparation method of the cobalt-free lithium-rich cathode material is as follows:

[0066] (1) NiSO 4 ·6H 2 O, MnSO 4 ·H 2 O is formulated into a 2mol / L aqueous solution according to the stoichiometric ratio, NaOH aqueous solution is used as a precipitating agent with a concentration of 4mol / L, and NH 3 ·H 2 O is used as a compl...

Embodiment 3

[0069] This embodiment provides a cobalt-free lithium-rich positive electrode material whose chemical formula is , the positive electrode material through Ni 0.30 mn 0.70 (OH) 2 It is obtained by sintering after compounding with lithium carbonate, wherein the doping amount of Nb is 2500ppm, the coating amount of Mg is 1000ppm, and the coating amount of Ti is 2500ppm;

[0070] Ni 0.30 mn 0.70 (OH) 2 The specific surface area a is 26m 2 / g, the tap density b is 1.4g / cm 3 ;

[0071] The specific surface area c of the cobalt-free lithium-rich cathode material is 1.1m 2 / g, the tap density d is 1.0g / cm 3 ;

[0072] a / c+b / d=25.

[0073] The preparation method of the cobalt-free lithium-rich cathode material is as follows:

[0074] (1) NiSO 4 ·6H 2 O, MnSO 4 ·H 2 O is formulated into a 4mol / L aqueous solution according to the stoichiometric ratio, NaOH aqueous solution is used as a precipitating agent, the concentration is 8mol / L, and NH 3 ·H 2 O is used as a compl...

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Abstract

The invention provides a cobalt-free lithium-rich positive electrode material as well as a preparation method and application thereof. The cobalt-free lithium-rich positive electrode material is obtained by compounding a nickel manganese hydroxide precursor and a lithium source and sintering an obtained compounded substance, wherein the nickel manganese hydroxide precursor meets the following conditions that: the specific surface area a is greater than 17m < 2 > / g and less than 27m < 2 > / g, and the tap density b is greater than 1.4 g / cm < 3 > and less than 1.6 g / cm < 3 >; the cobalt-free lithium-rich positive electrode material meets the following conditions of: the specific surface area c is more than 1m < 2 > / g and less than 5m < 2 > / g, and the tap density d is more than 1g / cm < 3 > and less than 2g / cm < 3 >; and a, c, b and d satisfy the relational expression that 5< = a / c + b / d <= 25. By regulating and controlling the specific surface area and tap density of the positive electrode material and the precursor thereof and establishing the relationship of the specific surface area and the tap density between the positive electrode material and the precursor thereof, the cycle performance of the positive electrode material is improved, and the voltage drop amplitude of the positive electrode material is reduced.

Description

technical field [0001] The invention belongs to the technical field of cobalt-free batteries, and relates to a cobalt-free lithium-rich positive electrode material and a preparation method and application thereof. Background technique [0002] Lithium-ion batteries have the advantages of high voltage platform, good cycle performance, no memory effect and high specific energy, and are currently the most widely used power batteries. With the development of smart grid energy storage and the continuous promotion of new energy vehicles, lithium-ion batteries have developed rapidly, and the market's performance requirements for lithium-ion batteries are also getting higher and higher. [0003] The energy density of lithium-ion batteries is mainly determined by the electrode materials, and the current commercial cathode materials (for example, LiCoO 2 、LiFePO 4 and the ternary material Li[Ni 1 / 3 co 1 / 3 mn 1 / 3 ]O 2 (NCM-111) etc.) the actual discharge specific capacity (<18...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/525H01M4/505H01M4/36H01M4/62H01M10/0525C01G53/00C01G45/12
CPCH01M4/525H01M4/505H01M4/366H01M4/628H01M10/0525C01G53/50C01G45/1257H01M2004/021H01M2004/028C01P2006/12C01P2006/11C01P2004/03C01P2006/40C01P2004/82Y02E60/10
Inventor 乔齐齐刘月园王鹏飞施泽涛郭丰李子郯杨红新
Owner SVOLT ENERGY TECHNOLOGY CO LTD
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