CN103117392A

CN103117392A - Slurry compounding process of lithium ion battery slurry

Info

Publication number: CN103117392A
Application number: CN2013100612732A
Authority: CN
Inventors: 丁建民
Original assignee: JIANGSU LENENG BATTERY CO Ltd
Current assignee: JIANGSU LENENG BATTERY CO Ltd
Priority date: 2013-02-27
Filing date: 2013-02-27
Publication date: 2013-05-22
Anticipated expiration: 2033-02-27
Also published as: CN103117392B

Abstract

The invention relates to a slurry compounding process of a lithium ion battery slurry. In mass percent, the process comprises the following steps of: (1) beating an adhesive, (2) configuring a conductive adhesive, and (3) configuring the slurry. The lithium ion battery slurry prepared by adopting the process has the characteristics of uniformity, stability, long standing time and the like, and at the same time the preparation process is simple, flexible and especially suitable for large-scale lithium ion battery slurry compounding applications.

Description

A kind of slurry-stirring process of pulp of lithium ion battery

Technical field

The present invention relates to a kind of lithium ion slurry-stirring process, relate in particular to a kind of preparation method of slurry-stirring process of pulp of lithium ion battery.

Background technology

The conforming factor of restriction lithium ion battery has many at present: such as: closing slurry, coating, raw material and battery core preparation thereof, is the key factor that affects its battery consistency and close slurry.It is mainly by stirring binding agent and conductive agent that known negative material closes slurry, add afterwards negative material in batches, prepare at last cathode size, Chinese patent specification CN201110060625.3 for example, disclose successively by adding binding agent, conductive agent, add afterwards active material, and the stirring certain hour obtains cathode size in batches.Above-mentionedly close the slurry mode to exist in advance conductive agent to disperse in active material inhomogeneous or that add afterwards conductive agent to disperse inhomogeneous, affected the consistency of closing slurry.

Summary of the invention

For above problem, the object of the present invention is to provide a kind of slurry-stirring process of pulp of lithium ion battery, to improve the consistency of slurry.

Technical scheme of the present invention is achieved in the following ways: a kind of slurry-stirring process of pulp of lithium ion battery by percentage to the quality, comprises the following steps as follows: 1) play glue, 2) configuration conducting resinl, 3) the slurry configuration; It is characterized in that:

The CMC(sodium cellulose glycolate of (1-3 parts)) and the redistilled water of (100-120 parts) 1), play glue: proportioning:, the redistilled water that adds (45～55 parts) in CMC, at dispersion condition be: vacuum degree is-0.09Mpa ~-0.1 Mpa, mixing speed is for after revolution stirs 4～12 hours under 20～25 rev/mins, the redistilled water that adds remaining (55～65 parts), and continue to stir (4～12) hour, obtain CMC glue;

2), the configuration conducting resinl: will add (0.5-4 part) conductive agent in above-mentioned CMC glue, be to stir under the condition of-0.09 ~-0.1 Mpa in vacuum degree, and its mixing speed is: revolve round the sun 30～50 rev/mins, 4000～7000 rev/mins of rotations; Mixing time is 6～24 hours, obtains conductive agent content and is the conducting resinl of (0.5%-4%);

Described conductive agent is one or more compound of SP, CNT, KS6 conductive agent; The mass ratio of conductive agent is: conductive agent: CMC=0.5～1.5:1;

3), slurry configuration: get graphite powder (100 parts) and add the above-mentioned conducting resinl of 20 parts～40 parts, low whipping speed: revolution is 30～50 rev/mins, autobiography is to stir 2～4 hours under the condition of 4000～10000 rev/mins, the above-mentioned conducting resinl that adds again 40 parts～50 parts, low whipping speed: revolution is 30～50 rev/mins, autobiography is to stir 2～4 hours under the condition of 4000～10000 rev/mins, the conducting resinl that adds again afterwards remaining above-mentioned 10 parts～40 parts, low whipping speed: revolution is 30～50 rev/mins, autobiography is to stir 2～4 hours under the condition of 4000～10000 rev/mins, adding at last 4.5 parts-5.5 parts, admittedly to contain be 50% SBR(SBR emulsion) and in stirring at low speed: under revolving round the sun as (10～20) rev/min condition, and continue to stir 3 hours, rear counter-rotating 0.5-1 hour, adopt at last 100 purpose strainer filterings to obtain cathode size.

Described cathode size is: graphite powder: conductive agent: CMC:SBR=93～95:0.5～1.5:0.5 ~ 1.5:4.5～5.5.

Adopt the pulp of lithium ion battery of technique of the present invention preparation, have the characteristics such as homogeneous, stable, standing time is long, its preparation technology is simple, flexibly simultaneously, is particularly suitable for large-scale lithium ion battery and closes slurry and use.

Embodiment

Embodiment 1:

A kind of slurry-stirring process of pulp of lithium ion battery by percentage to the quality, has following steps:

1, play glue: getting quality is 1.5 gram CMC(sodium cellulose glycolates) and add the redistilled water of 49 grams, be to disperse to stir 12 hours under the condition of 20 rev/mins afterwards for-0.1Mpa rate of dispersion in vacuum degree, add again afterwards the redistilled water of 73 grams, and continue in vacuum degree be-the 0.1Mpa condition under stirring 12 hours, obtain at last 100% glue, its quality is the conducting resinl of 123.5 grams;

2, configuration conducting resinl: with above-mentioned 100% glue that configures, add the SP conductive agent of 1.5 grams, be 30 rev/mins, certainly transfer under the condition of 5000 rev/mins and stir 5h in revolution afterwards, and must finely dispersed conductive gelatin;

3, slurry configuration: get that in step 1, quality is the conducting resinl of 37 grams, and add 93 gram graphite powders, in vacuum degree be-0.09Mpa afterwards, revolution speed is 35 rev/mins, rotational velocity is under the condition of 7000 rev/mins, stirred 2 hours, add again afterwards the conducting resinl of 61 grams, and stirred 2 hours, add again afterwards the conducting resinl of remaining 25 grams, and continue to stir 3 hours, adding at last 50% concentration is SBR 4 grams, and be counter-rotating 0.5 hour under the condition of 15 rev/mins in revolution, adopt at last 100 purpose strainer filterings to filter and obtain cathode size, cathode size content is: graphite powder: conductive agent: CMC:SBR=95:0.5:1.5:4.

Embodiment 2:

A kind of slurry-stirring process of pulp of lithium ion battery, by following steps:

1, play glue: getting quality is 1.0 gram CMC and the redistilled water that adds 61 grams, be to disperse to stir 4 hours under the condition of 25 rev/mins for-0.09Mpa rate of dispersion in vacuum degree, the redistilled water that adds again 61 grams, and continue in vacuum degree be-the 0.09Mpa condition under stirring 4 hours, obtain at last 100% glue, quality is the CMC glue of 123 grams;

2, configuration conducting resinl: with the above-mentioned 100 gram CMC glue that configure, adding SP conductive agent and the 0.2 gram CNT conductive agent of 0.3 gram, is that 50 rev/mins, autobiography are to stir 3h under the condition of 7000 rev/mins in revolution afterwards, and to obtain concentration be 0.5% conducting resinl;

3, slurry configuration: get that in step 2, quality is the conducting resinl of 40 grams, and add 95 gram graphite powders, in vacuum degree be-0.09Mpa afterwards, public biography speed is 50 rev/mins, autobiography speed is under the condition of 7000 rev/mins, stirred 2 hours, add again afterwards the conducting resinl of 45 grams, and stirred 2 hours, add again afterwards the conducting resinl of remaining 15 grams, and continue to stir 2 hours, adding at last concentration is 50% SBR 4.5 grams, and be counter-rotating 1 hour under the condition of 15 rev/mins in revolution, adopt at last 100 purpose strainer filterings to obtain cathode size, cathode size content is: graphite powder: conductive agent: CMC:SBR=95:0.5:1:4.

The present invention: first configure conducting resinl owing to adopting, its conductive agent can be dispersed in binding agent, to make the slurry that closes after it, conductive agent can be dispersed in active material; In the slurry layoutprocedure, first make glue and active material under high viscosity and high coagulant state (solid content is high) disperse to make during conductive agent is dispersed in active material, under high viscosity and high coagulant state, can shorten jitter time simultaneously; Affecting its slurry disperses the factor of evaluation of conforming quality to mainly contain: whether conductive agent disperses in active material whether homogeneous and active material obtain Uniform Dispersion, and the present invention program is owing to adopting first Uniform Dispersion conductive agent in binding agent, can guarantee that conductive agent obtains Uniform Dispersion, simultaneously because the slurry configuration is churned mechanically under high viscosity and high coagulant state, so disperse shearing force larger, can make active material obtain Uniform Dispersion and dispersant obtains Uniform Dispersion in active material; The present invention adopts that first to disperse binding agent can be that binding agent obtains Uniform Dispersion and do not destroy the structure of binding agent, make its after close the slurry process in eliminate bonding or the reunion of raw material, reduce the particle diameter of slurry, negative material is disperseed uniformly, and can not destroy the structure and characteristics of raw material itself, thereby improve the homogeneity of slurry and the utilization ratio of negative material; The present invention adopts the method for fed batch, in the middle of conducting resinl input active material slurries in batches, avoided the excessive and reunion that causes of local concentration, reduced the possibility that raw material is reunited from the source, the certain hour of slurry counter-rotating has simultaneously more been avoided the possibility of slurry reunion, has further improved the homogeneity of slurry.

Claims

1. the slurry-stirring process of a pulp of lithium ion battery, by percentage to the quality, comprise the following steps as follows: 1) play glue, 2) configuration conducting resinl, 3) the slurry configuration; It is characterized in that:

1), play glue: proportioning: 1-3 parts of sodium cellulose glycolate CMC and 100-120 parts of redistilled waters; Get and add the redistilled water of 45～55 parts in 1-3 parts of CMC, stir 4～12 hours under dispersion condition after, add the redistilled water of remaining 55～65 parts, and continue to stir 4～12 hours, obtain CMC glue;

2), the configuration conducting resinl: will add 0.5-4 part conductive agent in above-mentioned CMC glue, be to stir under the condition of-0.09 ~-0.1 Mpa in vacuum degree, and its mixing speed is: revolve round the sun 30～50 rev/mins, 4000～7000 rev/mins of rotations; Mixing time is 6～24 hours, obtains the conducting resinl that conductive agent content is 0.5%-4%;

3), cathode size configuration: get 100 parts of graphite powders and add the above-mentioned conducting resinl of 20 parts～40 parts, low whipping speed: revolution is 30～50 rev/mins, autobiography is to stir 2～4 hours under the condition of 4000～10000 rev/mins, the above-mentioned conducting resinl that adds again 40 parts～50 parts, low whipping speed: revolution is 30～50 rev/mins, autobiography is to stir 2～4 hours under the condition of 4000～10000 rev/mins, the conducting resinl that adds again afterwards remaining above-mentioned 10 parts～40 parts, low whipping speed: revolution is 30～50 rev/mins, autobiography is to stir 2～4 hours under the condition of 4000～10000 rev/mins, adding at last 4.5 parts-5.5 parts, admittedly to contain be 50% styrene butadiene rubber sbr emulsion and stirring at low speed: revolution is 10～20 rev/mins, and continues to stir 3 hours, and rear counter-rotating 0.5-1 hour adopts 100 purpose strainer filterings to obtain cathode size at last.

2. the slurry-stirring process of a kind of pulp of lithium ion battery according to claim 1, it is characterized in that: the dispersion condition in described step 1) is: vacuum degree is 20～25 rev/mins of revolution for-0.09Mpa ~-0.1 Mpa, mixing speed.

3. the slurry-stirring process of a kind of pulp of lithium ion battery according to claim 1 is characterized in that: the conductive agent described step 2) is one or more compound of SP, CNT, KS6 conductive agent; The mass ratio of conductive agent is: conductive agent: CMC=0.5～1.5:1.

4. the slurry-stirring process of a kind of pulp of lithium ion battery according to claim 1, it is characterized in that: the cathode size in described step 3) is: graphite powder: conductive agent: CMC:SBR=93～95:0.5～1.5:0.5 ~ 1.5:4.5～5.5.