A kind of negative electrode active material, negative electrode sheet and its preparation method and lithium ion battery

A technology of negative electrode active material and conductive agent, applied in the field of lithium battery, can solve the problems of limiting wide application, increasing battery manufacturing cost, affecting the rate charging and discharging performance of lithium battery, etc.

Active Publication Date: 2018-11-02
BTR NEW MATERIAL GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] Although the above method can improve the stability of the SEI film of high-energy-density batteries to a certain extent, and improve the cycle performance of the battery within a certain range, it will increase the manufacturing cost of the battery, and the manufacturing process is complicated, which is not conducive to mass production. , in the case of less liquid retention, the actual improvement effect is not significant
[0010] At the same time, with the continuous development of smart mobile devices, after putting forward higher requirements for the energy density and liquid retention capacity of lithium batteries, new requirements are also put forward for their fast charging capabilities. However, the improvement of energy density and electrolyte retention The reduction of liquid volume will seriously affect the rate charge and discharge performance of lithium batteries, thus limiting its wide application in the field of fast charging

Method used

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  • A kind of negative electrode active material, negative electrode sheet and its preparation method and lithium ion battery
  • A kind of negative electrode active material, negative electrode sheet and its preparation method and lithium ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0073] A method for preparing a lithium-ion battery negative pole piece, comprising:

[0074] (1) Physically and mechanically mix natural graphite, artificial graphite and conductive graphite at a mass ratio of 60:35:5 to form a composite carbon material, and then pass the composite carbon material into oxygen and nitrogen at 600°C for treatment, and after cooling the above materials Isostatic pressing treatment is performed to obtain a block-shaped pressed product, the treatment temperature is 200° C., the treatment pressure is 100.0 MPa, and the treatment time is 2.0 h. Put the above-mentioned square-shaped molded product at 950°C for 240 hours of thermal roasting treatment, and after cooling to room temperature, crush and sieve the above-mentioned molded product to form a product containing -COOH, =O, -OH oxygen-containing organic groups on the surface. Negative electrode active material; determined by XRD, the compacted density is 1.70g / cm 3 , the orientation index OI of ...

Embodiment 2

[0087] A method for preparing a lithium-ion battery negative pole piece, comprising:

[0088] (1) Physically and mechanically mix natural graphite, mesocarbon microspheres and artificial graphite at a mass ratio of 60:20:20 to form a composite carbon material, and then pass the composite carbon material into oxygen and argon at 580°C for cooling Afterwards, the above-mentioned material is subjected to hot molding treatment to obtain a cylindrical molded product. The treatment temperature is 400°C, the treatment pressure is 200.0MPa, and the treatment time is 0.5h. Put the above-mentioned cylindrical molded product at 500°C for 360 hours of thermal roasting treatment, and after cooling to room temperature, crush and sieve the above-mentioned molded product to form a surface containing -COOH, =O, -OH and -CHO oxygen-containing organic compounds The negative active material of the group; as determined by XRD, the compacted density is 1.65g / cm 3 , the orientation index OI of the ...

Embodiment 3

[0101] A method for preparing a lithium-ion battery negative pole piece, comprising:

[0102] (1) Natural graphite, artificial graphite and soft carbon are physically and mechanically mixed at a mass ratio of 35:55:10 and then mechanically fused with 5% silicon oxide to form a eutectic composite material, and the composite carbon material is passed through at 800°C Add chlorine gas for treatment, and after cooling, carry out isostatic pressing treatment on the above-mentioned material to obtain a square-shaped pressed product. The treatment temperature is 150°C, the treatment pressure is 300.0MPa, and the treatment time is 2.0h. Put the above-mentioned square-shaped molded product at 1200°C for 60 hours of thermal roasting treatment, and after cooling to room temperature, crush and sieve the above-mentioned molded product to form -COOH, =O, -OH oxygen-containing organic groups on the surface. Negative electrode active material; determined by XRD, the compacted density is 1.60g...

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Abstract

An active negative electrode material, a negative electrode pole piece, a preparation method thereof, and a lithium ion battery. Described negative electrode active material is the carbon material that the surface contains oxygen-containing organic functional group, or this carbon material and silicon or / and tin form by mechanical fusion one or at least two in carbon-silicon or / and carbon-tin composite material The combination. The negative electrode sheet comprising the active negative electrode material of the present invention can form a good compatibility with the electrolyte, and during the charging and discharging process, the oxygen-containing functional groups on the surface of the carbon material and the lithium salt and the solvent in the electrolyte can pass through carbon and oxygen. The chemical bonding action forms a dense and stable in-situ solid electrolyte membrane and a nano-scale microporous channel structure on the surface of the carbon material, so that the lithium-ion battery containing the negative electrode plate has low internal resistance, long cycle life and low liquid retention. Excellent rate capability.

Description

technical field [0001] The invention belongs to the field of lithium batteries. Specifically, the invention relates to a negative electrode active material, a negative electrode sheet, a preparation method thereof, and a lithium ion battery containing the negative electrode sheet. Background technique [0002] With the continuous development of the new energy industry, lithium-ion batteries, as a green and environmentally friendly new energy battery, have developed extremely rapidly. With the expansion of the application field of lithium batteries, people have put forward higher requirements for the energy density and safety performance of lithium batteries, and at the same time, the amount of electrolyte in the battery is also gradually reduced. [0003] However, there is a certain contradiction between the improvement of energy density and the reduction of liquid retention. In order to ensure the excellent comprehensive performance of high energy density lithium batteries,...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/13H01M4/139H01M10/0525H01M10/058
CPCY02E60/10Y02P70/50
Inventor 刘成闫慧青任建国
Owner BTR NEW MATERIAL GRP CO LTD
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