Lithium ion battery positive plate using cobalt-free high-nickel positive electrode material

A technology for lithium ion batteries and positive electrode materials, which is applied in battery electrodes, positive electrodes, secondary batteries, etc., can solve the problems that the positive electrode sheet is difficult to meet the long cycle test, the rate cycle performance and the control of element composition are not satisfactory, etc. Good cycle performance, reduced material cost, strong adhesion

Active Publication Date: 2021-02-19
WANXIANG 123 CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to overcome the problem that the positive electrode material of cobalt-free lithium-ion batteries in the prior art is not satisfactory in terms of rate cycle performance and element composition regulation, and the positive electrode sheet made by using it is difficult to meet the long-cycle test that meets commercial standards. , provide a lithium-ion

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  • Lithium ion battery positive plate using cobalt-free high-nickel positive electrode material
  • Lithium ion battery positive plate using cobalt-free high-nickel positive electrode material
  • Lithium ion battery positive plate using cobalt-free high-nickel positive electrode material

Examples

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Embodiment 1

[0039] A lithium-ion battery cathode sheet using a cobalt-free high-nickel cathode material, comprising a cathode current collector copper foil and an anode active material layer loaded on the copper foil, the composition of the anode active material layer including a mass ratio of 19:1:1 Cobalt-free high-nickel cathode material, acetylene black and binder.

[0040] The molecular formula of the cobalt-free high-nickel cathode material is Li(Ni 0.9 mn 0.1 )Zr 0.0023 o 2 , the preparation method of cobalt-free high-nickel positive electrode material is:

[0041] (1) Mix deionized water with a volume ratio of 5:1 and concentrated ammonia water with a mass concentration of 26% into the coprecipitation reactor, and stir at 60°C at a speed of 600r / min to obtain a reaction bottom liquid;

[0042] (2) NiSO 4 ·6H 2 O, MnSO 4 ·5H 2 O and ZrCl 4 Dissolve in water according to the molar ratio of Ni, Mn, and Zr atoms to form a mixed salt solution, and the total concentration of ea...

Embodiment 2

[0052] A lithium-ion battery cathode sheet using a cobalt-free high-nickel cathode material, comprising a cathode current collector copper foil and an anode active material layer loaded on the copper foil, the composition of the anode active material layer including a mass ratio of 18:1:1 A cobalt-free high-nickel cathode material, a single-walled carbon nanotube and a binder.

[0053] The molecular formula of the cobalt-free high-nickel cathode material is Li(Ni 0.7 mn 0.3 )Zr 0.002 o 2 , the preparation method of cobalt-free high-nickel positive electrode material is:

[0054] (1) Mix deionized water with a volume ratio of 4.5:1 and concentrated ammonia water with a mass concentration of 25% into the co-precipitation reactor, and stir at 40°C at a speed of 900r / min to obtain a reaction bottom liquid;

[0055] (2) NiSO 4 ·6H 2 O, MnSO 4 ·5H 2 O and ZrCl 4 Dissolve in water according to the molar ratio of Ni, Mn, and Zr atoms to form a mixed salt solution, and the tot...

Embodiment 3

[0065] A lithium-ion battery positive electrode sheet using a cobalt-free high-nickel positive electrode material, comprising a positive electrode current collector copper foil and a positive electrode active material layer loaded on the copper foil, the composition of the positive electrode active material layer includes a mass ratio of 20:1:1 A cobalt-free high-nickel cathode material, a single-walled carbon nanotube and a binder.

[0066] The molecular formula of the cobalt-free high-nickel cathode material is Li(Ni 0.5 mn 0.5 )Zr 0.003 o 2 , the preparation method of cobalt-free high-nickel positive electrode material is:

[0067] (1) Mix deionized water with a volume ratio of 5.5:1 and concentrated ammonia water with a mass concentration of 28% into the co-precipitation reactor, and stir at 80°C at a speed of 500r / min to obtain a reaction bottom liquid;

[0068] (2) NiSO 4 ·6H 2 O, MnSO 4 ·5H 2 O and ZrCl 4 Dissolve in water according to the molar ratio of Ni, Mn...

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Abstract

The invention discloses a lithium ion battery positive plate using a cobalt-free high-nickel positive electrode material, and the positive electrode comprises a positive electrode current collector and a positive electrode active substance layer loaded on the positive electrode current collector; the positive electrode active substance layer comprises the cobalt-free high-nickel positive electrodematerial, a conductive agent and a binder, the molecular formula of the cobalt-free high-nickel positive electrode material is Li(Ni<1-x>Mnx) ZryO2, wherein 0.1<=x<=0.5, and 0.002<=y<=0.003. The preparation method of the cobalt-free high-nickel positive electrode material comprises the following steps: preparing a (Ni<1-x>Mnx)Zry(OH)2 precursor through a coprecipitation method; and mixing and calcining the precursor and LiOH.H2O. The zirconium-doped cobalt-free high-nickel layered positive electrode material is used, so the cycle performance and the rate capability of the positive plate can be effectively improved; the precursor prepared by using the coprecipitation method is complete in morphology and uniform in size, the tested Zr content is basically consistent with the doping amount,and the structural stability and the high-temperature stability are good.

Description

technical field [0001] The invention relates to the technical field of lithium-ion batteries, in particular to a lithium-ion battery positive electrode sheet using a cobalt-free high-nickel positive electrode material. Background technique [0002] Layered high-nickel ternary lithium-ion battery cathode material Li(Ni 1-x-y Mn x Co y )O 2 (x+y<0.5) has a high energy density and is currently one of the most promising cathode materials. Among them, cobalt is not only an active material, but also can effectively inhibit the mixing of cations (Li / Ni) and stabilize the material structure. Therefore, ternary materials containing cobalt generally have good deep discharge characteristics and good rate performance. However, due to the high price of cobalt and the lack of reserves, it is not conducive to large-scale use. It has gradually become the consensus of the industry to reduce the use of cobalt in cathode materials. [0003] Cobalt-free ternary cathode materials are usu...

Claims

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Application Information

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IPC IPC(8): H01M4/131H01M4/525H01M4/505H01M4/62H01M10/0525
CPCH01M4/131H01M4/505H01M4/525H01M4/623H01M10/0525H01M2004/028Y02E60/10
Inventor 肖彪彪陈瑶许梦清
Owner WANXIANG 123 CO LTD
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