Positive electrode material, preparation method thereof and lithium ion battery

A cathode material and matrix material technology, applied in the field of lithium ion batteries, cathode materials and their preparation, can solve the problems that restrict the industrial application of ultra-high nickel layered single crystal cathode materials, the deterioration of first cycle capacity and cycle capacity, Li/Ni Mixed row and other problems, to achieve the effect of effective control of first efficiency and cycle stability, high capacity, and improved stability

Pending Publication Date: 2022-04-26
SHENZHEN CITY BATTERY NANOMETER TECH
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Problems solved by technology

However, in actual preparation, ultra-high Ni layered single crystal cathode materials tend to form non-stoichiometric Li 1-x Ni 1+x o 2 Compounds, where the value of x is closely related to the synthesis conditions, the reproducibility of the material is extremely poor, which seriously restricts the industrial application of ultra-high nickel layered single crystal cathode materials
There are two main reasons for the formation of non-stoichiometric ratio problems: first, Ni 2+ →Ni 3+ Oxidation barrier is high, making Ni 2+ remnant and into Li + Second, during the high-temperature calcination process, the volatilization of lithium salts leads to the lack of lithium in the material, and the problem of non-stoichiometric ratio not only brings certain challenges to the industrial and stable preparation of ultra-high nickel materials, And it caused a sharp deterioration in first week capacity and cycle capacity

Method used

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  • Positive electrode material, preparation method thereof and lithium ion battery
  • Positive electrode material, preparation method thereof and lithium ion battery
  • Positive electrode material, preparation method thereof and lithium ion battery

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preparation example Construction

[0106] The application also provides a preparation method of positive electrode material, such as figure 1 As shown, it is a flow chart for the preparation of the positive electrode material of the present application, including the following steps:

[0107] Step S100, Ni m co n m 1-m-n (OH) 2 The precursor and the first lithium compound are mixed and subjected to a heat treatment to obtain a matrix material, wherein, 0.9≤m≤1.0, 0≤n≤0.1, M includes at least transition metal elements, II main group elements and III main group elements A sort of.

[0108] Step S200 , mixing the matrix material with the second lithium compound and performing a second heat treatment to obtain the positive electrode material.

[0109] This application is approved by Ni m co n m 1-m-n (OH) 2 The precursor and the first lithium compound are subjected to a heat treatment to realize the effective control of the lattice lithium in the matrix material and ensure that the material has a good laye...

Embodiment 1

[0155] In this embodiment, the positive electrode material is prepared according to the following method:

[0156] (1) The precursor LiNi 0.94 co 0.055 mn 0.005 o 2 , Lithium hydroxide and tungsten oxide were added to the high mixer, and mixed at high speed for 30 minutes; the molar ratio of precursor and lithium salt was Li / A=1.07 (A=Ni, Co and Mn), and tungsten oxide was 0.94 co 0.055 mn 0.005 o 2 The mass proportion in the mixture is 0.05%, and then heat-treated at 800°C for 10 hours, and after crushing and pulverizing, the matrix material is obtained;

[0157] (2) Weigh a certain proportion of distilled water and base material, wash with water for 0.1h, carry out suction filtration and vacuum drying to the washed material to obtain material M2;

[0158] (3) According to the mass ratio of 1:0.01:0.01, the material M2, lithium hydroxide and tungsten oxide were respectively weighed and added into a high-mixer, and after mixing evenly, they were kept at 500° C. for 5 ho...

Embodiment 2

[0160] In this embodiment, the positive electrode material is prepared according to the following method:

[0161] (1) The precursor LiNi 0.94 co 0.055 mn 0.005 o 2 , lithium hydroxide and zirconium oxide were added to the high mixer, and mixed at high speed for 30 minutes; the molar ratio of precursor and lithium salt was Li / A=1.07 (A=Ni, Co and Mn), strontium hydroxide 0.94 co 0.055 mn 0.005 o 2 The mass proportion in the mixture is 0.15%, and then heat-treated at 700°C for 8 hours, and after crushing and pulverizing, the matrix material is obtained;

[0162] (2) Weigh a certain proportion of distilled water and base material, wash with water for 0.1h, carry out suction filtration and vacuum drying to the washed material to obtain material M2;

[0163] (3) According to the mass ratio of 1:0.002:0.01, the material M2, lithium hydroxide and tungsten oxide were respectively weighed and added into a high-mixer, and after mixing evenly, they were kept at 350° C. for 5 hour...

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Abstract

The invention relates to a positive electrode material and a preparation method thereof, and a lithium ion battery, the chemical general formula of the positive electrode material is as shown in the formula (1): LiaNimConM1-m-nO2 (1), in the formula, 1.000 < = a < = 1.015, 0.9 < = m < = 1.0, 0 < = n < = 0.1, and a = x + y + z, M comprises at least one of transition metal elements, II main group elements and III main group elements, x represents the molar ratio of lattice lithium to metal elements in the positive electrode material, y represents the molar ratio of lattice lithium to metal elements in the positive electrode material, and z represents the molar ratio of lattice lithium to metal elements in the positive electrode material. X is equal to 0.984 to 0.990; y represents the molar ratio of active lithium to metal elements of the positive electrode material, and y is equal to 0.010-0.020; z represents the molar ratio of surface free lithium to metal elements in the positive electrode material, and z is equal to 0.010-0.015; wherein the metal element comprises the sum of Ni, Co and M. According to the invention, by regulating and controlling the structural composition of the stoichiometric ratio lithium content of the positive electrode material, effective regulation and control of the first efficiency and the cycle stability of the positive electrode material are realized.

Description

technical field [0001] The present application relates to the technical field of positive electrode materials, in particular to a positive electrode material, a preparation method thereof, and a lithium ion battery. Background technique [0002] Ultra-high nickel layered single crystal cathode material (LiNi x m y o 2 , x>0.9, x+y=1) is one of the candidates for the next-generation high specific energy density cathode material, which has a high capacity and can effectively avoid the formation of microcracks and maintain the structural stability of the material. However, in actual preparation, ultra-high Ni layered single crystal cathode materials tend to form non-stoichiometric Li 1-x Ni 1+x o 2 compound, where the value of x is closely related to the synthesis conditions, and the reproducibility of the material is extremely poor, which seriously restricts the industrial application of ultra-high nickel layered single crystal cathode materials. There are two main re...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/525H01M10/0525
CPCH01M4/525H01M10/0525
Inventor 胡文慧文洪超郑玉严武渭程林杨顺毅黄友元
Owner SHENZHEN CITY BATTERY NANOMETER TECH
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