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Preparation method of high-nickel lithium battery with long cycle life

A cycle life, lithium battery technology, applied in the field of lithium-ion batteries, can solve the problems of increased internal resistance of the battery cell, increased polarization of the pole pieces, and affecting the infiltration effect of the electrolyte, so as to eliminate residual alkali, increase the content, eliminate The effect of the hidden danger of cell cycle degradation

Active Publication Date: 2019-03-12
HEFEI GUOXUAN HIGH TECH POWER ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] With the improvement of energy density requirements for lithium battery cells, high-nickel ternary cathode materials are widely used by battery manufacturers, but with the increase of nickel content, the residual alkali content on the surface of positive electrode particles will gradually increase in the process of product trial production , the HF reaction generated by the decomposition of residual alkali and electrolyte will produce a large amount of gas. During the battery cycle, the gas produced by the battery will cause the rupture between the positive electrode particles, the contact surface between the positive electrode particles and the electrolyte will increase, and the side reactions will increase. The side reaction products lead to an increase in the internal resistance of the battery cell and an increase in the heat generated by the battery cell; at the same time, gas production will also lead to an increase in the internal pressure of the battery cell, and the extrusion of the winding core will be too tight, which will affect the electrolyte infiltration effect and cause polarization between the pole pieces. increase, which also leads to increased heat production
These unfavorable factors will lead to deterioration of battery cycle performance

Method used

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  • Preparation method of high-nickel lithium battery with long cycle life

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Effect test

Embodiment 1

[0019] A method for preparing a high-nickel lithium battery with high cycle life, comprising winding core baking, liquid injection, chemical formation, and aging, the specific steps are as follows:

[0020] 1) The positive electrode sheet is made of lithium nickelate with a nickel content of 85wt%, and then the positive electrode sheet, separator and graphite are assembled into a core by winding;

[0021] 2) Put the winding core in continuous nitrogen circulation for baking, and make the moisture content to 300ppm after baking;

[0022] 3) Carry out chemical formation at room temperature of 25°C and negative pressure of -40KPa;

[0023] 4) Aging is carried out under the negative pressure of -40KPa and the temperature of 50°C. The aging time is more than 48h until the end of gas production. A high-sensitivity pressure sensor is used to determine whether the gas production is over. After the end of gas production.

Embodiment 2

[0025] A method for preparing a high-nickel lithium battery with high cycle life, comprising winding core baking, liquid injection, chemical formation, and aging, the specific steps are as follows:

[0026] 1) The positive electrode sheet is made of nickel-cobalt lithium manganese oxide with a nickel content of 90wt%, and then the positive electrode sheet, separator and graphite are assembled into a roll core by lamination;

[0027] 2) Put the winding core in continuous nitrogen circulation for baking, and make the moisture content to 600ppm after baking;

[0028] 3) Carry out chemical formation at room temperature at 20°C and negative pressure of -90KPa;

[0029] 4) Aging is carried out under the negative pressure of -90KPa and the temperature of 46°C. The aging time is more than 48h until the end of gas production. A high-sensitivity pressure sensor is used to determine whether the gas production is over;

Embodiment 3

[0031] A method for preparing a high-nickel lithium battery with high cycle life, comprising winding core baking, liquid injection, chemical formation, and aging, the specific steps are as follows:

[0032] 1) The positive electrode sheet is made of lithium nickel manganese oxide with a nickel content of 81wt%, and then the positive electrode sheet, separator and graphite are assembled into a core by winding;

[0033] 2) Put the winding core in continuous nitrogen circulation, bake at 85°C for 36 hours, and make the moisture content after baking to 500ppm; then put it aside at 55°C for 24 hours;

[0034] 3) Carry out chemical formation at room temperature 25°C and negative pressure of -60KPa;

[0035] 4) Aging is carried out under the negative pressure of -60KPa and the temperature of 55°C. The aging time is more than 48h until the end of gas production. A high-sensitivity pressure sensor is used to determine whether the gas production is over; after the end of gas production,...

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Abstract

The invention discloses a preparation method of a high-nickel lithium battery with a long cycle life. The preparation method comprises core baking, liquid injection, chemical formation and aging, thehigh nickel-lithium battery is made of a high-nickel positive electrode material, the moisture content of the roasted core is 300-600ppm, the chemical formation is carried out at a normal temperature,and the temperature of the aging is greater than 45 DEG C. The moisture requirements for the roasted core are reduced, the residual moisture in a pole piece reacts with the electrolyte, the generatedHF can react with the residual alkali on the surface of a high-nickel positive electrode, the normal temperature chemical formation is adopted to reduce the damage impact of HF on an SEI film, and atan aging stage, the temperature is increased and the generated gas is pumped out in time to facilitate the forward progress of the reaction, the reaction helps to reduce the amount of residual alkalion the surface of the positive electrode, so that the gas is eliminated at an early stage, and the cycle cracking of the battery is avoided in the later cycle of gas production.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, and relates to a preparation method of a high-nickel lithium battery with a high cycle life. Background technique [0002] With the improvement of energy density requirements for lithium battery cells, high-nickel ternary cathode materials are widely used by battery manufacturers, but with the increase of nickel content, the residual alkali content on the surface of positive electrode particles will gradually increase in the process of product trial production , the HF reaction generated by the decomposition of residual alkali and electrolyte will produce a large amount of gas. During the battery cycle, the gas produced by the battery will cause the rupture between the positive electrode particles, the contact surface between the positive electrode particles and the electrolyte will increase, and the side reactions will increase. The side reaction products lead to an increase in the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/058H01M10/44
CPCH01M10/058H01M10/446Y02E60/10Y02P70/50
Inventor 王祖华高二平张宏立
Owner HEFEI GUOXUAN HIGH TECH POWER ENERGY