A production method of a power type lithium ion battery anode material

Abstract

A production method of a power type lithium ion battery anode material is provided. Needle coke is adopted as a main raw material. The method includes a step of crushing and grading the needle coke into micron-size particles; a step of adding asphalt into carbon disulfide liquid, stirring the mixture to dissolve the asphalt, then adding the needle coke micron-size particles, fully stirring the mixture, and performing evaporation to dryness at 70 DEG C; a step of adding graphene into an ethanol solution having a concentration of 70%, fully stirring the ethanol solution, then adding phenolic resin into the ethanol solution, stirring the mixture to obtain a suspension, filtering the suspension and performing evaporation to dryness; a step of subjected to two dried materials to mixing, heating and modification at 300-400 DEG C according to a certain ratio; and a step of performing carbonization at 1300-1400 DEG C, or performing carbonization at 1300-1400 DEG C, and then performing graphitization at 2800-3000 DEG C, or directly performing graphitization at 3000-3200 DEG C. The material prepared by the method has advantages of a high charge-discharge rate, good cyclic performance, good charge-discharge reaction reversibility, a high capacity, and the like.

Description

technical field

[0001] The invention relates to a production method for a negative electrode material of a power type lithium ion battery, belonging to the technical field of negative electrode materials for lithium ion batteries. Background technique

[0002] In the next five years, the average annual growth rate of the lithium-ion battery market for new energy vehicles will be around 50%. With the continuous development of the new energy vehicle industry, consumers have put forward higher requirements for new energy vehicles. New energy vehicle power batteries face problems such as high battery prices, long charging time, short cruising range, poor environmental versatility, and short service life during use. However, if new energy vehicles want to improve product quality and speed up technological breakthroughs, they are mainly limited to the development of power batteries. The progress of lithium-ion battery technology mainly comes from the innovative research and appl...

Examples

Embodiment 1

[0026] Weigh 200 kg of raw material A, pulverize, classify and adjust to a fine powder with a median particle size of 13 μm.

[0027] CS 2 Add 10g of raw material B into the liquid and stir to dissolve, then add 1000g of raw material A micropowder, stir evenly, heat to 70°C, and evaporate to dryness.

[0028] Add 80 g of raw material D to an appropriate amount of 70% ethanol solution, and after ultrasonically stirring evenly, add 8 g of raw material C, stir to form a uniform suspension, then filter and evaporate to dryness.

[0029] Weigh 1000g of the A+B mixture, add 80g of the C+D mixture, heat and mix and modify at 300-400°C after mixing, then carbonize at 1400°C, and finally graphitize at 3000°C.

[0030] A LIR2430 type button battery was used for the test, and the discharge capacity of the obtained negative electrode material was 350.2mAh / g, and the discharge efficiency was 94.6%, as shown in Table 1.

Embodiment 2

[0032] Weigh 200 kg of raw material A, pulverize, classify and adjust to a fine powder with a median particle size of 11 μm.

[0033] CS 2 Add 5g of raw material B into the liquid and stir to dissolve, then add 1000g of raw material A micropowder, stir evenly, heat to 70°C, and evaporate to dryness.

[0034] Add 60 g of raw material D to an appropriate amount of 70% ethanol solution, and after ultrasonic stirring, add 20 g of raw material C, stir to form a uniform suspension, then filter and evaporate to dryness.

[0035] Weigh 1000g of the A+B mixture, add 20g of the C+D mixture, heat and mix and modify at 300-400°C after mixing, and then graphitize at 3100°C.

[0036] A LIR2430 type button battery was used for the test, and the discharge capacity of the obtained negative electrode material was 351.8mAh / g, and the discharge efficiency was 94.1%, as shown in Table 1.

Embodiment 3

[0038] Weigh 200 kg of raw material A, pulverize, classify and adjust to a fine powder with a median particle size of 14 μm.

[0039] CS 2 Add 8g of raw material B to the liquid and stir to dissolve, then add 1000g of raw material A micropowder, stir evenly, heat to 70°C, and evaporate to dryness.

[0040] Add 50 g of raw material D to an appropriate amount of 70% ethanol solution, and after ultrasonically stirring evenly, add 30 g of raw material C, stir to form a uniform suspension, then filter and evaporate to dryness.

[0041] Weigh 1000g of the A+B mixture, add 30g of the C+D mixture, heat and mix and modify at 300-400°C after mixing, then carbonize at 1300°C, and finally graphitize at 2800°C.

[0042] A LIR2430 type button battery was used for the test, and the discharge capacity of the obtained negative electrode material was 351.6mAh / g, and the discharge efficiency was 94.3%, as shown in Table 1.

technical field

[0001] The invention relates to a production method for a negative electrode material of a power type lithium ion battery, belonging to the technical field of negative electrode materials for lithium ion batteries. Background technique

[0002] In the next five years, the average annual growth rate of the lithium-ion battery market for new energy vehicles will be around 50%. With the continuous development of the new energy vehicle industry, consumers have put forward higher requirements for new energy vehicles. New energy vehicle power batteries face problems such as high battery prices, long charging time, short cruising range, poor environmental versatility, and short service life during use. However, if new energy vehicles want to improve product quality and speed up technological breakthroughs, they are mainly limited to the development of power batteries. The progress of lithium-ion battery technology mainly comes from the innovative research and appl...

Examples

Embodiment 1

[0026] Weigh 200 kg of raw material A, pulverize, classify and adjust to a fine powder with a median particle size of 13 μm.

[0027] CS 2 Add 10g of raw material B into the liquid and stir to dissolve, then add 1000g of raw material A micropowder, stir evenly, heat to 70°C, and evaporate to dryness.

[0028] Add 80 g of raw material D to an appropriate amount of 70% ethanol solution, and after ultrasonically stirring evenly, add 8 g of raw material C, stir to form a uniform suspension, then filter and evaporate to dryness.

[0029] Weigh 1000g of the A+B mixture, add 80g of the C+D mixture, heat and mix and modify at 300-400°C after mixing, then carbonize at 1400°C, and finally graphitize at 3000°C.

[0030] A LIR2430 type button battery was used for the test, and the discharge capacity of the obtained negative electrode material was 350.2mAh / g, and the discharge efficiency was 94.6%, as shown in Table 1.

Embodiment 2

[0032] Weigh 200 kg of raw material A, pulverize, classify and adjust to a fine powder with a median particle size of 11 μm.

[0033] CS 2 Add 5g of raw material B into the liquid and stir to dissolve, then add 1000g of raw material A micropowder, stir evenly, heat to 70°C, and evaporate to dryness.

[0034] Add 60 g of raw material D to an appropriate amount of 70% ethanol solution, and after ultrasonic stirring, add 20 g of raw material C, stir to form a uniform suspension, then filter and evaporate to dryness.

[0035] Weigh 1000g of the A+B mixture, add 20g of the C+D mixture, heat and mix and modify at 300-400°C after mixing, and then graphitize at 3100°C.

[0036] A LIR2430 type button battery was used for the test, and the discharge capacity of the obtained negative electrode material was 351.8mAh / g, and the discharge efficiency was 94.1%, as shown in Table 1.

Embodiment 3

[0038] Weigh 200 kg of raw material A, pulverize, classify and adjust to a fine powder with a median particle size of 14 μm.

[0039] CS 2 Add 8g of raw material B to the liquid and stir to dissolve, then add 1000g of raw material A micropowder, stir evenly, heat to 70°C, and evaporate to dryness.

[0040] Add 50 g of raw material D to an appropriate amount of 70% ethanol solution, and after ultrasonically stirring evenly, add 30 g of raw material C, stir to form a uniform suspension, then filter and evaporate to dryness.

[0041] Weigh 1000g of the A+B mixture, add 30g of the C+D mixture, heat and mix and modify at 300-400°C after mixing, then carbonize at 1300°C, and finally graphitize at 2800°C.

[0042] A LIR2430 type button battery was used for the test, and the discharge capacity of the obtained negative electrode material was 351.6mAh / g, and the discharge efficiency was 94.3%, as shown in Table 1.

Images