Precursor for doped lithium ion battery, cathode material and preparation method of precursor and cathode material

A technology for lithium-ion batteries and cathode materials, applied in battery electrodes, circuits, electrical components, etc., can solve the problems of poor cycle performance and rate performance, low discharge specific capacity, etc., and achieve excellent electrochemical performance, stable particle structure, Effect of improving cycle performance

Pending Publication Date: 2021-03-05
JINGMEN GEM NEW MATERIAL
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Problems solved by technology

[0003] In view of this, the main purpose of the present invention is to provide a nickel-cobalt-manganese precursor for doped lithium-ion batteries, which solves the problems of existing material stability, poor cycle performance and rate performance, and low discharge specific capacity; The object of the invention is also to provide the preparation method of the precursor, the cathode material prepared from the precursor and the preparation method of the cathode material

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  • Precursor for doped lithium ion battery, cathode material and preparation method of precursor and cathode material
  • Precursor for doped lithium ion battery, cathode material and preparation method of precursor and cathode material
  • Precursor for doped lithium ion battery, cathode material and preparation method of precursor and cathode material

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preparation example Construction

[0023] Embodiments of the present invention also provide a method for preparing a nickel-doped lithium-ion battery for nickel-cobalt manganese precursors including the following steps:

[0024] Step 1, according to the molar ratio Ni: CO: (Mn + Mg) 7: 1: 2 and Mn: Mg of 0.2-x: x (0.02 ≤ x ≤ 0.04), nickelin salt, cobalt salt, manganese salt, Magnesium salt is thoroughly mixed to prepare mixed salt solutions, spare;

[0025] Among them, the nickel salt is at least one of nickel chloride, nickel sulfate, nitrate nickel nitrate; at least one of cobalt chloride, cobalt sulfate, cobalt nitrate; manganese salt is manganese chloride, manganese sulfate, manganese nitrate At least one of the medium; magnesium salt is magnesium chloride, magnesium sulfate, at least one of magnesium nitrate; nickel, cobalt, manganese and magnesium ions in the mixed salt solution of 1 to 3 mol / L;

[0026] Step 2, in the atmosphere of an inert gas, the mixed salt solution, the base solution, and the ammonia w...

Embodiment 1

[0032] 1) Nickel cobalt manganese precursor Ni for preparing doped lithium-doped ion battery 0.7 CO 0.1 Mn 0.18 Mg 0.02 (OH) 2 ;

[0033] Step 1, according to the ratio of molar ratio: CO: (Mn + mg) 7: 1: 2 and Mn: Mg is 0.18: 0.02 (9: 1), mixed sulfate, sulfate, sulfate, magnesium sulfate , A mixed salt solution of 2 mol / L is made of nickel, cobalt, manganese, and magnesium ions, spares;

[0034] Step 2, in the atmosphere of nitrogen, a mixed salt solution, a concentration of 4 mol / L, a concentration of ammonia water, and an ammonia concentration of 10 mol / L are added to the reactor, respectively, and the pH of the control system during the addition of the process. It was 11 to 12.5, and the coprecipitation reaction was performed at a stirring rate of 55 ° C and 200 rpm;

[0035] Step 3, when the particle size of the precursor particles in the reactor reaches the required size, the reaction is stopped, and the material in the reactor is transferred to the aging tank, then c...

Embodiment 2

[0040] 1) Nickel cobalt manganese precursor Ni for preparing doped lithium-doped ion battery 0.7 CO 0.1 Mn 0.18 Mg 0.02 (OH) 2 ;

[0041] Step 1, according to the ratio of molar ratio: CO: (Mn + mg) 7: 1: 2 and Mn: Mg is 0.18: 0.02 (9: 1), mixed sulfate, sulfate, sulfate, magnesium sulfate , Made into a mixed salt solution having a concentration of nickel, cobalt, manganese, and magnesium ions, a mixed salt solution, spare;

[0042] Step 2, in the atmosphere of an inert gas, the mixed salt solution, the concentration of 3 mol / L, a concentration of 8 mol / L is added to the reaction vessel, respectively, in the process of the process, respectively, the process of the process. The pH is 11 to 12.5, and the coprecipitation reaction is carried out at 40 ° C and a stirring rate of 150 rpm.

[0043] Step 3, when the particle size of the precursor particles in the reactor reaches the required size, the reaction is stopped, and the material in the reactor is transferred to the aging tan...

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Abstract

The invention discloses a nickel-cobalt-manganese precursor for a doped lithium ion battery. The precursor is a radial metal hydroxide, the chemical expression of the precursor is Ni0.7Co0.1Mn0.2-xMgx(OH)2, and the x is greater than or equal to 0.02 and less than or equal to 0.04. The invention also discloses a preparation method of the nickel-cobalt-manganese precursor. According to the preparation method, an Mg doping element is directly added in the coprecipitation process, so that the doping element can be uniformly distributed in precursor particles, the modification effect of the dopingelement is effectively exerted, and magnesium doping is beneficial to forming a good layered structure, enhancing the structural stability of the material and improving the cycle performance of the high-nickel ternary material.

Description

Technical field [0001] The present invention belongs to the technical field of battery material, and more particularly to a precursor, a positive electrode material and a precursor and a positive electrode material for a doped lithium ion battery. Background technique [0002] In the face of environmental problems due to continuous development due to continuous development of technology and using fossil energy, the lithium-ion battery (LIBS) is long, the self-discharge is small, the open circuit is high, no memory effect, and the cycle life is long. Environmental pollution is small, and it stands out; the positive material is a key composition of the lithium ion battery, which is not only used as electrode materials to participate in electrochemical reactions, but also acts as a lithium ion source, which largely determines the safety and performance of the battery. , Cost and life; with the continuous expansion and extension of lithium-ion battery application scenarios, the capac...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/48H01M4/505H01M4/525
CPCH01M4/505H01M4/525H01M4/48Y02E60/10
Inventor 许开华蒋振康张坤陈康李聪黎俊孙海波范亮姣
Owner JINGMEN GEM NEW MATERIAL
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