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A kind of high-nickel cathode material of modified lithium ion battery and preparation method thereof

A technology for lithium ion batteries and cathode materials, which is applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of unsatisfactory battery discharge capacity, poor cycle stability, and high residual lithium, and achieve good cycle stability and safety performance, The effect of improving discharge specific capacity and avoiding corrosion

Active Publication Date: 2020-05-12
GUANGDONG BRUNP RECYCLING TECH +3
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to overcome the disadvantages and deficiencies of high residual lithium in the high-nickel materials of the prior art, unsatisfactory battery discharge capacity, low first effect, and poor cycle stability, the primary purpose of the present invention is to provide a combination of water washing and tin coating. Preparation method of high-nickel positive electrode material for lithium-ion battery

Method used

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  • A kind of high-nickel cathode material of modified lithium ion battery and preparation method thereof
  • A kind of high-nickel cathode material of modified lithium ion battery and preparation method thereof
  • A kind of high-nickel cathode material of modified lithium ion battery and preparation method thereof

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Effect test

Embodiment 1

[0035] In terms of mass ratio, high nickel cathode material: deionized water is 1:2, tin source: high nickel cathode material is 1:1500. First weigh 100g LiNi 0.8 co 0.1 mn 0.1 o 2 The material was added to 200mL deionized water, stirred and washed at 1000r / min for 10min, filtered, dried in a vacuum oven at 120°C for 4h, and passed through a 400-mesh sieve to obtain a washed high-nickel cathode material. Grind the tin oxide again, pass through a 200-mesh sieve, weigh 0.067g of the sieved tin oxide powder and 100g of the washed positive electrode material into the ball mill jar at the same time, place on the ball mill and mix evenly, discharge, sieve, and Under 90% oxygen atmosphere, heat up to 500°C at a heating rate of 3°C / min, sinter at a constant temperature for 5 hours, cool, crush, and sieve to obtain a water-washed and tin-coated modified lithium-ion battery high-nickel cathode material. After testing, the mass of tin in the obtained high-nickel cathode material is L...

Embodiment 2

[0043] In terms of mass ratio, high nickel positive electrode material: deionized water is 1:2, tin source: high nickel positive electrode material is 1:750. First weigh 100g LiNi 0.8 co 0.1 mn 0.1 o 2 The material was added to 200mL deionized water, stirred and washed at 1000r / min for 10min, filtered, dried in a vacuum oven at 120°C for 4h, and passed through a 400-mesh sieve to obtain a washed high-nickel cathode material. Then grind the tin oxide, pass through a 200-mesh sieve, weigh 0.134g of the sieved tin oxide powder and 100g of the washed positive electrode material, and add them to the high-efficiency mixer to mix evenly, discharge, sieve, and mix in 80% oxygen Under the atmosphere, the temperature was raised to 500°C at a heating rate of 3°C / min, sintered at a constant temperature for 5 hours, cooled, crushed, and sieved to obtain a lithium-ion battery high-nickel positive electrode material with a uniform tin coating on the surface. After testing, the mass of ti...

Embodiment 3

[0045] In terms of mass ratio, high nickel positive electrode material: deionized water is 1:4, tin source: high nickel positive electrode material is 1:750. First weigh 100g LiNi 0.8 co 0.1 mn 0.1 o 2 The material was added to 400mL deionized water, stirred and washed at 1000r / min for 5min, filtered, dried in a vacuum oven at 120°C for 4h, and passed through a 400-mesh sieve to obtain a washed high-nickel cathode material. Grind the tin oxide again, pass through a 300-mesh sieve, weigh 0.134g of the sieved tin oxide powder and 100g of the washed positive electrode material into the ball mill jar at the same time, place on the ball mill and mix evenly, discharge, sieve, and Under an 80% oxygen atmosphere, heat up to 550°C at a heating rate of 3°C / min, sinter at a constant temperature for 4 hours, cool, crush, and sieve to obtain a lithium-ion battery high-nickel cathode material with evenly coated tin on the surface. After testing, the mass of tin in the obtained high-nick...

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Abstract

The invention belongs to the technical field of lithium ion battery materials and discloses a water washing and tin coating combined modified lithium ion battery high-nickel anode material and a preparation method thereof. The preparation method includes following steps: (1), adding a high-nickel anode material into water, quickly stirring and washing for 1-20min at a rotating speed of 500-2000r / min, filtering, and drying to obtain a water-washed high-nickel anode material; (2), mixing the water-washed high-nickel anode material with a tin source well, heating to 300-700 DEG C in an oxygen-containing atmosphere at a heating rate of 1-3 DEG C / min, sintering at constant temperature for 3-10h, discharging, and breaking to obtain the modified lithium ion battery high-nickel anode material. According to the method, the high-nickel anode material is quickly washed in the water, the tin source is utilized to absorb residual lithium, and a composite coating layer of lithium stannate and tin oxide is formed on the surface of the material, so that discharging capacity and first effect of a battery are improved, and circulating performance and safety performance are improved.

Description

technical field [0001] The invention belongs to the technical field of lithium-ion battery materials, and in particular relates to a modified lithium-ion battery high-nickel positive electrode material combined with water washing and tin coating and a preparation method thereof. Background technique [0002] In the application of lithium-ion battery cathode materials, the layered nickel-cobalt-manganese ternary composite material LiNi x co y mn z o 2 (where x+y+z=1, 0<x, y, z<1), through the synergistic effect of Ni-Co-Mn, it can combine LiCoO 2 , LiNiO 2 , LiMnO 2 The advantages of these three materials make the prepared lithium-ion battery have the characteristics of high specific capacity, good cycle performance, low cost, and low toxicity. It is currently a very promising positive electrode material. With the continuous expansion of the lithium-ion battery application market, the market has put forward higher and higher requirements for the specific capacity,...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/38H01M10/0525
CPCH01M4/366H01M4/38H01M4/387H01M10/0525Y02E60/10
Inventor 张莹娇阮丁山马文柱林波刘伟健
Owner GUANGDONG BRUNP RECYCLING TECH
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