Preparing method for submicron particles of nickel-manganese-base lithium ion battery anode material

A technology of submicron particles and ion batteries, applied in battery electrodes, nanotechnology for materials and surface science, secondary batteries, etc., can solve the problems of large particles and poor electrical properties, achieve uniform particle size, and improve discharge The effect of easy control of specific capacity and particle size

Inactive Publication Date: 2014-08-27
HARBIN INST OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The present invention aims to solve the technical problems of large particles and poor electrical properties obtained by the existing preparation method of lithium-ion battery cathode materials, and provides a method for preparing submicron particles of nickel-manganese-based lithium-ion battery cathode materials

Method used

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  • Preparing method for submicron particles of nickel-manganese-base lithium ion battery anode material
  • Preparing method for submicron particles of nickel-manganese-base lithium ion battery anode material
  • Preparing method for submicron particles of nickel-manganese-base lithium ion battery anode material

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specific Embodiment approach 1

[0016] Embodiment 1: A method for preparing submicron particles of a nickel-manganese-based lithium-ion battery positive electrode material according to this embodiment is carried out in the following steps:

[0017] 1. According to the stoichiometric formula Li(M x Ni y mn 1-x-y ) Ni, Mn and M mol ratio in O2 Nickel nitrate, manganese nitrate, M nitrate and excess lithium nitrate, first add nickel nitrate, manganese nitrate and M nitrate to N,N-dimethyl In formamide, stir magnetically at room temperature until all the inorganic salts are completely dissolved, add polyvinylpyrrolidone and lithium nitrate, and stir until the polyvinylpyrrolidone is completely dissolved to obtain an electrospinning precursor solution; wherein Li(M x Ni y mn 1-x-y )O 2 M is a combination of one or several elements in Co, Fe and Al, 0

[0018] 2. Inject the obtained spinning precursor liquid into the syringe with stainless steel needle of the electrospinning machin...

specific Embodiment approach 2

[0020] Embodiment 2: This embodiment differs from Embodiment 1 in that the amount of lithium nitrate added in step 1 is 1.02 to 1.15 times the stoichiometric ratio. Others are the same as in the first embodiment.

specific Embodiment approach 3

[0021] Specific embodiment three: the difference between this embodiment and specific embodiment one or two is that the total mass concentration of lithium nitrate, nickel nitrate, manganese nitrate and M nitrate in the electrospinning precursor solution in step one is 8% to 25%. , the mass concentration of polyvinylpyrrolidone is 8-15%. Others are the same as in the first or second embodiment.

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Abstract

The invention relates to a preparing method of a nickel-manganese-base lithium ion battery anode material, in particular to a preparing method for submicron particles for the nickel-manganese-base lithium ion battery anode material. The technical problems that a material obtained through an existing preparing method for the nickel-manganese-base lithium ion battery anode material is large in particle size and poor in electrical property are solved. The preparing method includes the steps that according to the chemical formula Li (MxNiyMn1-x-y) O2, a electrostatic spinning precursor solution is prepared through metal nitrates, N, N-dimethyl formamide and polyvinylpyrrolidone; the electrostatic spinning precursor solution is spun into nano-fibers through an electrostatic spinning machine, and the nano-fibers are calcinated to obtain the submicron particles for the nickel-manganese-base lithium ion battery anode material. The particle diameter of the submicron particles is 50 nm-200 nm, the specific discharge capacity under the condition of 1000 mA / g large current reaches 110 mAh / g, and only differs from that under the condition of 20 mA / g current by 39.3 mAh / g. The submicron particles for the nickel-manganese-base lithium ion battery anode material can be used in a high-power lithium ion battery.

Description

technical field [0001] The invention relates to a preparation method of a positive electrode material of a lithium ion battery. Background technique [0002] With the continuous prominence of energy and environmental issues, the rapid development of new energy has been created. Compared with secondary batteries such as traditional lead-acid batteries, nickel-cadmium batteries, and nickel-hydrogen batteries, lithium-ion batteries have the advantages of high working voltage, high energy density, long cycle life, low self-discharge rate, low pollution, and no memory effect. , which has received extensive attention and rapid development. The electrode material in the lithium-ion battery is the core part of the battery. Compared with the negative electrode material, the research on the positive electrode material of the lithium-ion battery is relatively lagging behind, which has become an important factor restricting the development of the lithium-ion battery. [0003] The trad...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/48D04H1/4382D04H1/728
CPCB82Y30/00D04H1/4382D04H1/728H01M4/485H01M4/505H01M4/525H01M10/0525Y02E60/10
Inventor 熊岳平梁成豪刘连宝杨路霍华戴长松
Owner HARBIN INST OF TECH
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