lini 0.8 co 0.15 al 0.05 o 2 Positive electrode material and preparation method thereof

Abstract

The invention relates to the field of lithium batteries and particularly relates to a positive-pole material LiNi0.8Co0.15Al0.05O2 and a preparation method thereof. PVP is added during the preparationof a NCA material, and electrochemical properties of the NCA material are improved through regulating and controlling the morphology of the obtained NCA material. The obtained material is subjected to morphology structure characterization by adopting an X-ray diffractometer and a scanning electron microscope, and button cells are assembled due to the electrochemical properties and are tested by using a cell programmed-control tester and an electrochemical workstation. Proven by research results, due to the spatial effect and electrostatic action of the PVP, the PVP modified NCA material has amore complete rod-shaped structure and develops a better layered structure, and electrochemical energy storage properties are relatively greatly improved.

Description

technical field

[0001] The invention relates to the field of lithium batteries, in particular to a LiNi 0.8 co 0.15 al 0.05 o 2 Positive electrode material and its preparation method. Background technique

[0002] LiNi 0.8 co 0.15 al 0.05 o 2 (NCA) materials have attracted much attention due to their advantages of high specific capacity, good structural stability and low cost. For the problems of low initial charge-discharge efficiency and poor rate performance, it is mainly modified by surface coating, element doping, and morphology improvement.

[0003] However, surface coating and elemental doping are often accompanied by increased irreversible capacity. Contents of the invention

[0004] The first object of the present invention is to provide a kind of LiNi 0.8 co 0.15 al 0.05 o 2 Preparation method of cathode material.

[0005] The second object of the present invention is to provide a kind of LiNi 0.8 co 0.15 al 0.05 o 2 Cathode material.

[0006] ...

Examples

Embodiment 1

[0044] A kind of LiNi that present embodiment provides 0.8 co 0.15 Al 0.05 o 2 The positive electrode material is prepared as follows:

[0045] Weigh 0.5mmol CoSO 4 ·7H 2 O was dissolved in 25ml deionized water, and the labeled solution was A. Weigh 24mmolNiSO 4 ·6H 2 O, 4.0mmol CoSO 4 ·7H 2 O, 0.75mmol Al 2 (SO 4 ) 3 18H 2 O was dissolved in 75ml deionized water, and the labeled solution was B. Weigh 36mmol H 2 C 2 o 4 2H 2 Dissolve O in 120ml deionized water, add 0.1324g PVP while stirring, and mark the solution as C. With continuous stirring, solution A was slowly added dropwise to solution C to obtain a suspension. Then solution B was added dropwise to the suspension at a certain speed. After the dropwise addition was completed, it was stirred for 2 hours, then filtered with suction, and the precipitate was washed, and finally vacuum-dried at 80°C for 12 hours. The obtained sample is the precursor of cathode material, marked as MC 2 o 4 2H 2 O-PVP. ...

Embodiment 2

[0047] A kind of LiNi that present embodiment provides 0.8 co 0.15 Al 0.05 o 2 The positive electrode material is prepared as follows:

[0048] Weigh 0.5mmol CoSO 4 ·7H 2 O was dissolved in 25ml deionized water, and the labeled solution was A. Weigh 24mmolNiSO 4 ·6H 2 O, 4.0mmol CoSO 4 ·7H 2 O, 0.75mmol Al 2 (SO 4 ) 3 18H 2 O was dissolved in 75ml deionized water, and the labeled solution was B. Weigh 36mmol H 2 C 2 o 4 2H 2 Dissolve O in 120ml of deionized water, add 0.662g of PVP while stirring, and mark the solution as C. With continuous stirring, solution A was slowly added dropwise to solution C to obtain a suspension. Then, solution B was added dropwise to the suspension at a certain speed. After the dropwise addition was completed, it was stirred for 3 hours, then suction filtered, and the precipitate was washed, and finally vacuum-dried at 75°C for 10 hours. The obtained sample is the precursor of cathode material, marked as MC 2 o 4 2H 2 O-PVP. ...

Embodiment 3

[0050] A kind of LiNi that present embodiment provides 0.8 co 0.15 Al 0.05 o 2 The positive electrode material is prepared as follows:

[0051] Weigh 0.5mmol CoSO 4 ·7H 2 O was dissolved in 25ml deionized water, and the labeled solution was A. Weigh 24mmolNiSO 4 ·6H 2 O, 4.0mmol CoSO 4 ·7H 2 O, 0.75mmol Al 2 (SO 4 ) 3 18H 2 O was dissolved in 75ml deionized water, and the labeled solution was B. Weigh 36mmol H 2 C 2 o 4 2H 2 Dissolve O in 120ml of deionized water, add 1.986g of PVP while stirring, and mark the solution as C. With continuous stirring, solution A was slowly added dropwise to solution C to obtain a suspension. Then, solution B was added dropwise to the suspension at a certain speed. After the dropwise addition was completed, it was stirred for 1 hour, then filtered with suction, and the precipitate was washed, and finally vacuum-dried at 85°C for 15 hours. The obtained sample is the precursor of cathode material, marked as MC 2 o 4 2H 2 O-P...

technical field

[0001] The invention relates to the field of lithium batteries, in particular to a LiNi 0.8 co 0.15 al 0.05 o 2 Positive electrode material and its preparation method. Background technique

[0002] LiNi 0.8 co 0.15 al 0.05 o 2 (NCA) materials have attracted much attention due to their advantages of high specific capacity, good structural stability and low cost. For the problems of low initial charge-discharge efficiency and poor rate performance, it is mainly modified by surface coating, element doping, and morphology improvement.

[0003] However, surface coating and elemental doping are often accompanied by increased irreversible capacity. Contents of the invention

[0004] The first object of the present invention is to provide a kind of LiNi 0.8 co 0.15 al 0.05 o 2 Preparation method of cathode material.

[0005] The second object of the present invention is to provide a kind of LiNi 0.8 co 0.15 al 0.05 o 2 Cathode material.

[0006] ...

Examples

Embodiment 1

[0044] A kind of LiNi that present embodiment provides 0.8 co 0.15 Al 0.05 o 2 The positive electrode material is prepared as follows:

[0045] Weigh 0.5mmol CoSO 4 ·7H 2 O was dissolved in 25ml deionized water, and the labeled solution was A. Weigh 24mmolNiSO 4 ·6H 2 O, 4.0mmol CoSO 4 ·7H 2 O, 0.75mmol Al 2 (SO 4 ) 3 18H 2 O was dissolved in 75ml deionized water, and the labeled solution was B. Weigh 36mmol H 2 C 2 o 4 2H 2 Dissolve O in 120ml deionized water, add 0.1324g PVP while stirring, and mark the solution as C. With continuous stirring, solution A was slowly added dropwise to solution C to obtain a suspension. Then solution B was added dropwise to the suspension at a certain speed. After the dropwise addition was completed, it was stirred for 2 hours, then filtered with suction, and the precipitate was washed, and finally vacuum-dried at 80°C for 12 hours. The obtained sample is the precursor of cathode material, marked as MC 2 o 4 2H 2 O-PVP. ...

Embodiment 2

[0047] A kind of LiNi that present embodiment provides 0.8 co 0.15 Al 0.05 o 2 The positive electrode material is prepared as follows:

[0048] Weigh 0.5mmol CoSO 4 ·7H 2 O was dissolved in 25ml deionized water, and the labeled solution was A. Weigh 24mmolNiSO 4 ·6H 2 O, 4.0mmol CoSO 4 ·7H 2 O, 0.75mmol Al 2 (SO 4 ) 3 18H 2 O was dissolved in 75ml deionized water, and the labeled solution was B. Weigh 36mmol H 2 C 2 o 4 2H 2 Dissolve O in 120ml of deionized water, add 0.662g of PVP while stirring, and mark the solution as C. With continuous stirring, solution A was slowly added dropwise to solution C to obtain a suspension. Then, solution B was added dropwise to the suspension at a certain speed. After the dropwise addition was completed, it was stirred for 3 hours, then suction filtered, and the precipitate was washed, and finally vacuum-dried at 75°C for 10 hours. The obtained sample is the precursor of cathode material, marked as MC 2 o 4 2H 2 O-PVP. ...

Embodiment 3

[0050] A kind of LiNi that present embodiment provides 0.8 co 0.15 Al 0.05 o 2 The positive electrode material is prepared as follows:

[0051] Weigh 0.5mmol CoSO 4 ·7H 2 O was dissolved in 25ml deionized water, and the labeled solution was A. Weigh 24mmolNiSO 4 ·6H 2 O, 4.0mmol CoSO 4 ·7H 2 O, 0.75mmol Al 2 (SO 4 ) 3 18H 2 O was dissolved in 75ml deionized water, and the labeled solution was B. Weigh 36mmol H 2 C 2 o 4 2H 2 Dissolve O in 120ml of deionized water, add 1.986g of PVP while stirring, and mark the solution as C. With continuous stirring, solution A was slowly added dropwise to solution C to obtain a suspension. Then, solution B was added dropwise to the suspension at a certain speed. After the dropwise addition was completed, it was stirred for 1 hour, then filtered with suction, and the precipitate was washed, and finally vacuum-dried at 85°C for 15 hours. The obtained sample is the precursor of cathode material, marked as MC 2 o 4 2H 2 O-P...

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