High-voltage lithium cobalt positive electrode material and preparation method and application thereof

A positive electrode material, lithium cobalt oxide technology, applied in the field of high-voltage lithium cobalt oxide positive electrode material and its preparation, can solve the problems of doping, instability, high manganese doping content, etc., and achieve simple preparation method and process, good structure and stability Sexuality and controllable effect of the operation process

Active Publication Date: 2019-09-10
GUANGDONG BRUNP RECYCLING TECH +3
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Chinese patent document CN103490063A uses manganese doping to stabilize LiCoO 2 The stability of the structure under high voltage, the surface is coated with a thicker inert oxide layer; however, the thicker inert coating layer under high voltage hinders the transmission path of lithium ions, which reduces the capacity. The doping amount is too high, further reducing the capacity
But the above in LiCoO 2 Although the introduction of manganese into the battery improves safety, there are unstable factors to a certain extent due to changes in the valence state of manganese. At the same time, excessive doping of manganese will reduce the capacity of lithium cobalt oxide, thus affecting the actual performance of high-voltage lithium cobalt oxide. application

Method used

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  • High-voltage lithium cobalt positive electrode material and preparation method and application thereof
  • High-voltage lithium cobalt positive electrode material and preparation method and application thereof
  • High-voltage lithium cobalt positive electrode material and preparation method and application thereof

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Effect test

Embodiment 1

[0064] The preparation concentration is 200L of cobalt nitrate solution of 0.4mol / L, the preparation concentration is 6.25L of nickel nitrate solution of 0.2mol / L, the preparation concentration is 8.33L of aluminum nitrate of 0.2mol / L, do precipitant with 30% liquid caustic soda, with 25% analytical pure ammonia as complexing agent. Wherein, cobalt nitrate, aluminum nitrate, nickel nitrate, sodium hydroxide alkali solution and complexing agent are respectively put into different containers, wherein cobalt nitrate solution and nickel nitrate solution are respectively put into containers with stirring. refer to figure 1 At the same time, open the liquid inlet metering pump, the aluminum nitrate solution flows into the nickel nitrate solution with stirring at a flow rate of 167mL / h, the nickel nitrate solution flows into the reactor at a flow rate of 292mL / h, and the cobalt nitrate solution flows into the reactor at a flow rate of 4L / h Reactor, nitrogen gas is passed into the re...

Embodiment 2

[0072] The preparation concentration is 80L of cobalt sulfate solution of 1mol / L, the preparation concentration is 10.83L of nickel sulfate solution of 0.1mol / L, the preparation concentration is 33.3L of aluminum nitrate of 0.05mol / L, do precipitation agent with 30% liquid caustic soda, with 25 % analytically pure ammonia as complexing agent. Among them, the cobalt sulfate solution, the aluminum nitrate solution, the nickel sulfate solution, the sodium hydroxide alkali solution and the complexing agent are put into different containers respectively, wherein the cobalt sulfate solution and the nickel sulfate solution are respectively put into a container with stirring. At the same time, turn on the liquid inlet metering pump, the aluminum nitrate solution flows into the nickel sulfate solution with stirring at a flow rate of 832.5mL / h, the nickel sulfate solution flows into the reactor at a flow rate of 1.1L / h, and the cobalt sulfate solution flows at a flow rate of 2L / h It flo...

Embodiment 3

[0076] Prepare 100L of cobalt chloride solution with a concentration of 0.8mol / L, 10.47L of nickel chloride solution with a concentration of 0.2mol / L, 8.38L of aluminum chloride with a concentration of 0.2mol / L, and use 30% liquid caustic for precipitation As a complexing agent, use 25% analytically pure ammonia water as a complexing agent. Among them, cobalt chloride solution, aluminum chloride solution, nickel chloride solution, sodium hydroxide alkali solution and complexing agent are put into different containers respectively, wherein cobalt chloride and nickel chloride solution are put into a container with stirring middle. At the same time, open the liquid inlet metering pump, the aluminum chloride solution flows into the nickel chloride solution with stirring according to the flow rate of 167.6mL / h, the nickel chloride solution flows into the reactor at a flow rate of 377mL / h, and the cobalt chloride solution flows into the reactor at a flow rate of 2L / h. The flow rate...

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Abstract

The invention discloses a high-voltage lithium cobalt positive electrode material and preparation method and application thereof. The high-voltage lithium cobalt positive electrode material comprisesan inner layer and a coating layer, wherein the inner layer is lithium cobalt particle core gradiently doped with nickel and aluminum, the doping content of the nickel in lithium cobalt particle is gradually reduced from inside to outside, the doping content of the aluminum in the lithium cobalt particle is gradually increased from inside to outside, the coating layer is a lithium cobalt compositeoxide containing M' element, and M' is selected from one or more of Ni, Mn, Al, Ti, Y, Zr, La, P, Nb, Sb and Ce. Meanwhile, the preparation method and application thereof of the high-voltage lithiumcobalt positive electrode material is also provided. The lithium cobalt material has better structure stability under a high voltage, higher discharging specific capacity and excellent cycle property.The preparation method and process of the lithium cobalt material is simple, and the operation process is controllable.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to a high-voltage lithium cobalt oxide positive electrode material and a preparation method and application thereof. Background technique [0002] With the development of electronic technology, 3C products are updated more and more frequently. 3C products refer to information appliances including computers, communications and consumer electronics. The "thinning" of 3C products is a development trend, which puts forward higher requirements for the energy density of lithium-ion batteries. Among them, high-voltage lithium cobalt oxide (charging voltage ≥ 4.4V vs Li) is one of the most ideal positive electrode materials for 3C products; when the charging cut-off voltage of lithium cobalt oxide positive electrode material is less than 4.2V, the discharge point specific capacity is only about 140mAh / g, If the cut-off voltage is increased to 4.4V, the discharge ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/525H01M4/62H01M10/0525
CPCH01M4/366H01M4/525H01M4/628H01M10/0525H01M2004/021H01M2004/028Y02E60/10
Inventor 李斌阮丁山毛林林李伟权吴星宇林弘毅李长东
Owner GUANGDONG BRUNP RECYCLING TECH
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