CN106920968A - Lithium ion battery negative batch mixing, negative pole and lithium ion battery - Google Patents
Lithium ion battery negative batch mixing, negative pole and lithium ion battery Download PDFInfo
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- CN106920968A CN106920968A CN201510993172.8A CN201510993172A CN106920968A CN 106920968 A CN106920968 A CN 106920968A CN 201510993172 A CN201510993172 A CN 201510993172A CN 106920968 A CN106920968 A CN 106920968A
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/62—Selection of inactive substances as ingredients for active masses, e.g. binders, fillers
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/052—Li-accumulators
- H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/13—Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
- H01M4/131—Electrodes based on mixed oxides or hydroxides, or on mixtures of oxides or hydroxides, e.g. LiCoOx
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/13—Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
- H01M4/133—Electrodes based on carbonaceous material, e.g. graphite-intercalation compounds or CFx
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/13—Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
- H01M4/134—Electrodes based on metals, Si or alloys
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M2004/026—Electrodes composed of, or comprising, active material characterised by the polarity
- H01M2004/027—Negative electrodes
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Abstract
The invention belongs to technical field of lithium ion, a kind of lithium ion battery negative batch mixing, negative pole and lithium ion battery are specifically disclosed.The lithium ion battery negative batch mixing, including negative active core-shell material, conductive agent, thickener and binding agent, the thickener are graft modification konjak glucomannan.Lithium ion battery negative batch mixing provided in an embodiment of the present invention, thickener uses graft modification konjak glucomannan, because the thickener has superior submissive performance and can improve the conducting power of lithium ion in lithium ion battery, therefore available less graft modification konjak glucomannan and binding agent replace NaCMC/SBR composite binders, content of the negative electrode active material in negative pole can not only be improved, and because graft modification konjak glucomannan itself has lithium ion transport ability, so cryogenic property and high rate performance are obviously more preferable, finally cause that lithium ion battery chemical property is further enhanced.
Description
Technical field
It is the invention belongs to technical field of lithium ion more particularly to a kind of lithium ion battery negative batch mixing, negative
Pole and lithium ion battery.
Background technology
The both positive and negative polarity of lithium ion battery is mainly made up of active material, binding agent, conductive agent and collector.Its
In, common binding agent is macromolecular compound, is mainly used in for electrode active material adhering to afflux body surface
Face, plays bonding and keeps active material, strengthens electrode active material and conductive agent and active material and afflux
Electronics contact between body, the structure of final preferably stabilization pole piece.
Expansion/the contraction of electrode can occur due to lithium ion battery plus-negative plate in charge and discharge process.Therefore,
Seeking binding agent can play certain cushioning effect to the expansion/contraction of battery plus-negative plate.Although binding agent is in lithium
Consumption in ion battery both positive and negative polarity is not a lot, but its caking property and pliability often directly affect lithium
The end-use properties of ion battery.Therefore, to cause the performance of lithium ion battery more superior, selection is closed
Suitable binding agent seems particularly significant.
Current commercialized lithium ion battery generally uses Kynoar (English abbreviation：PVDF) as bonding
Agent, this mainly has benefited from PVDF has cohesive force higher to electrode material and collector, while to slurry
Peptizaiton is also thickened well.But, needed to use when the use of PVDF being binding agent certain
NMP is used as dispersant, but NMP pollutes the environment, while cost is not low.
Meanwhile, in the market also has the binder system with NaCMC/SBR as binding agent.The bonding of this type
Agent system is more environmentally friendly with respect to PVDF in process of production with water as dispersant, and price advantage is substantially,
So negative material binding agent is increasingly turned to based on water-based system.
But, in NaCMC/SBR composite binders, the mainly SBR of cementation is played in pole piece
Component can just make the active material in slurry be in the suspended dispersion of stabilization, it is necessary to be introduced into NaCMC.
Because NaCMC has the effect of surfactant, wetability of the water to active material can be improved,
Meanwhile, also with the effect of dispersion thickening, reunion and the precipitation of active material can be prevented.And PVDF is then
Have two kinds of functions of NaCMC/SBR composite binders concurrently simultaneously, this causes that NaCMC/SBR is combined and bonds
Agent can cause the content of active material low relative to PVDF binding agents by 2%~3% in cathode formula, even more
It is low.And the reduction of negative electrode active material, the decline of lithium ion conduction ability can be caused.Therefore, using
NaCMC/SBR composite binders prepare negative plate, formed lithium ion battery when, low temperature, multiplying power and
Cycle performance aspect is not as the lithium ion battery of oleaginous system.
The content of the invention
The purpose of the embodiment of the present invention solve the meeting that above-mentioned existing aqueous binders are present make lithium ion battery lithium from
A kind of problem of sub- conducting power reduction, there is provided lithium ion battery negative batch mixing.
Another purpose of the embodiment of the present invention is, there is provided the lithium prepared by the lithium ion battery negative batch mixing
Ion battery negative pole and lithium ion battery.
To achieve the above object, the embodiment of the present invention employs following technical scheme：
A kind of lithium ion battery negative batch mixing, including negative active core-shell material, conductive agent, thickener and binding agent,
The thickener is graft modification konjak glucomannan.
Correspondingly, a kind of lithium ion battery negative, including negative electrode active layer, the negative electrode active layer is by above-mentioned
Described lithium ion battery negative batch mixing is formed.
And, correspondingly, the lithium ion battery provided by above-mentioned lithium ion battery negative.
The lithium ion battery negative batch mixing thickener that above-described embodiment is provided uses graft modification konjac mannan
Glycan.Because the weight average molecular weight of konjak glucomannan is millions of dalton, industrial commodity glue
Degree is dozens or even hundreds of times of NaCMC thickener viscosity under comparable sodium up to 20Pas, using compared with
Few konjak glucomannan can produce satisfied thickening effect, simultaneously because konjak glucomannan molecule
Contain great amount of hydroxy group in chain, through graft modification after, not only submissive performance is more superior, and other performances are such as
Lithium ion conduction ability etc. is also lifted accordingly, therefore is gathered using a small amount of graft modification konjac mannan
Sugar replaces the NaCMC in lithium ion battery negative batch mixing, so as to improve the ratio of active material in electrode slice.
Above-described embodiment provide lithium ion battery negative, for lithium ion battery in, due to negative pole batch mixing
Thickener usage amount reduction so that the shared proportion increase in negative material of negative electrode active material, and then make
Lithium ion battery energy density is obtained to be lifted, and because thickener uses modified konjaku glucomannans,
The conducting power of lithium ion is effectively raised, the performance of lithium ion battery is finally improved.
Brief description of the drawings
Fig. 1 is the lithium ion battery negative material that embodiment of the present invention 1-Cell1 and comparative example 1-Cell5 is provided
250 cycle performance contrast schematic diagrams of lithium ion battery normal temperature of preparation.
Specific embodiment
In order to make the purpose , technical scheme and advantage of the present invention be clearer, below in conjunction with accompanying drawing and reality
Example is applied, the present invention will be described in further detail.It should be appreciated that specific embodiment described herein is only
Only it is used to explain the present invention, is not intended to limit the present invention.
A kind of lithium ion battery negative batch mixing provided in an embodiment of the present invention, including negative active core-shell material, conduction
Agent, thickener and binding agent, the thickener are graft modification konjak glucomannan.
Wherein, in any embodiment, negative active core-shell material native graphite, Delanium, the modified day in surface
Right graphite, hard carbon, soft carbon, carbonaceous mesophase spherules, polysilicon micro wire, polysilicon nanometer particle, silicon substrate
At least one in alloy powder, the sub- silicon micron particles of oxidation.
Preferably, conductive agent is that conductive black, electrically conductive graphite, gas-phase growth of carbon fibre, many wall carbon are received
At least one in mitron, SWCN and Graphene.
In any embodiment, thickener is graft modification konjak glucomannan.And graft modification konjaku Portugal
Mannosan carries out graft modification by konjak glucomannan, and the molecular weight of konjak glucomannan is number
Megadalton, industrial commercial viscosimetry can reach 20Pas, be that the plant for being found at present is practical
A kind of material of viscosity highest in glue, under same concentrations, its viscosity is the tens of NaCMC gelatin viscosities
Even hundreds of times, it means that the konjak glucomannan glue of very low concentrations in actual applications, just can produce
Raw satisfied thickening effect.Contain substantial amounts of hydroxyl in the strand of konjak glucomannan simultaneously, it is convenient to
It is carried out the modification such as to be grafted, can assign it has the New function being fit for various uses, so as to expand it
Range of application.
Preferably, graft modification konjak glucomannan is polyethylene glycol oxide graft modification konjac mannan
Glycan, PPOX graft modification konjak glucomannan, polyethylene glycol graft modification konjac mannan gather
Sugared, polysiloxane-grafted modified konjaku glucomannans, polyethylene glycol succinate graft modification Amorphophallus rivieri glucomannan
Dew glycan, grafting polyethylene imine modified konjaku glucomannans and polyacrylonitrile-grafted modified konjac mannan
At least one in glycan.
Konjak glucomannan it is modified as the graft modification konjak glucomannan after, strand is more
With good lithium ion conduction ability while submissive, energy while active material ratio in raising electrode slice
The energy density of electrode is enough improved, helps to lift every chemical property of battery product.
Preferably, the weight average molecular weight of graft modification konjak glucomannan is 1 × 106~2 × 106.This
Content both can guarantee that obvious thickening effect, and can guarantee that there is rate of dissolution higher in water again.
Preferably, thickener, i.e. graft modification konjak glucomannan account for the lithium ion battery negative
The 0%~1.0% of batch mixing gross mass percentage.This content is before compliance, lithium ion conduction ability is ensured
Put, it is possible to reduce the usage amount of thickener, and then greatly improve the ratio of active material in electrode slice.
Preferably, the binding agent is Kynoar (PVDF), butadiene-styrene rubber (SBR), polyethylene
It is alcohol, polyacrylate, polymethyl methacrylate, polyacrylamide, polyamic acid, polyimides, poly-
At least one in amide imide and sodium alginate.
Correspondingly, the present invention additionally provides a kind of lithium on the basis of above-mentioned lithium ion battery negative batch mixing
Ion battery negative pole.In one embodiment, lithium-ion negative pole includes negative current collector and is coated on the negative pole
The negative electrode active layer of collection liquid surface, the negative electrode active layer is formed by above-mentioned lithium ion battery negative batch mixing
Formed by techniques such as coating, roll-ins after slurry, that is, the lithium ion battery negative batch mixing forms slurry
Negative current collector surface is coated on according to traditional lithium-ion battery negative pole production technology form negative electrode active layer afterwards.
Correspondingly, in above-described embodiment offer lithium ion battery negative batch mixing, the base of lithium ion battery negative
On plinth, the embodiment of the present invention additionally provides corresponding lithium ion battery.
In one embodiment, the lithium ion battery includes positive plate, negative plate, is interval in adjacent positive piece
Barrier film and electrolyte and negative plate between, negative plate therein are the above embodiment of the present invention offer
Lithium ion battery negative, or be coated on negative current collector after forming slurry by above-mentioned lithium-ion negative pole batch mixing
Surface forms.
Preferably, the positive plate from the metal composite oxide containing lithium as positive electrode active materials, such as
LiFePO 4, cobalt acid lithium, nickle cobalt lithium manganate etc., but it is not limited only to this cited several positive-active material
Material.
Positive plate is formed by being coated in plus plate current-collecting body after positive electrode active materials formation slurry.
Specifically, the plus plate current-collecting body is aluminium or the aluminium foil for being coated with conductive carbon.
Preferably, the electrolyte is made up of electrolyte solvent and electrolyte solute.
Wherein, the electrolyte solvent is ethylene carbonate (EC), propene carbonate (PC), carbonic acid fourth
Alkene ester (BC), dimethyl carbonate (DMC), diethyl carbonate (DEC), methyl ethyl carbonate (EMC),
At least one in methyl propyl carbonate (MPC)；
The solute of the electrolyte is lithium hexafluoro phosphate (LiPF6), LiBF4 (LiBF4), perchloric acid
Lithium (LiClO4), double (fluorine sulphonyl) imine lithium (LiN (SO2F)2), double (trimethyl fluoride sulfonyl) imine lithiums
(LiN(CF3SO2)2), di-oxalate lithium borate (LiBOB), in difluorine oxalic acid boracic acid lithium (LiDFOB)
At least one.
The lithium ion battery manufactured using negative material provided in an embodiment of the present invention or negative pole, is changed using grafting
The konjak glucomannan of property as negative material thickener combination Kynoar, butadiene-styrene rubber, poly- second
Enol, polyacrylate, polymethyl methacrylate, polyacrylamide, polyamic acid, polyimides,
At least one formation composite binder in polyamidoimide and sodium alginate, substituted for NaCMC/SBR
Composite binder, can cause that thickener and the consumption of binding agent decrease, so as to improve lithium-ion electric
The proportion of active material in the negative plate of pond, the raising of active material proportion, it is possible to increase the energy density of electrode.
Importantly, the konjak glucomannan of the graft modification for using not only has more compliant strand,
There is good lithium ion conduction ability to act on simultaneously, ultimately help to lift every electrochemistry of battery product
Performance.
In order to better illustrate the embodiment of the present invention, the embodiment of the present invention is illustrated below by way of multiple examples
The lithium-ion negative pole batch mixing of offer, negative pole and lithium ion battery.
Embodiment 1
The preparation of negative plate N1.Compared according to weight is native graphite：Polyethylene glycol oxide graft modification konjaku
Glucomannans：Butadiene-styrene rubber：Conductive black：Deionized water=98.5:0.1:0.4:1:80 ratio, weighs
Each component；Then high-speed stirred is carried out to each component for weighing, obtains finely dispersed cathode size；
The slurry is equably coated in Copper Foil two sides, is compacted by drying, roll squeezer, obtained negative plate and be designated as N1.
The preparation of positive plate P1.Compared according to weight is cobalt acid lithium：Kynoar：Conductive black：N-
Methyl pyrrolidone=90:5:5:40 ratio, weighs each component；Then each component for weighing is carried out
High-speed stirred, obtains finely dispersed anode sizing agent；The slurry is equably coated in aluminium foil two sides, through overdrying
Dry, roll squeezer compacting, obtains positive plate and is designated as P1.
The preparation of lithium ion battery Cell1.Conductive lug is welded on positive plate P1 and negative plate N1, will
Polypropylene, polyethylene composite isolated film is positioned in the middle of positive pole and negative pole, is wound to form naked battery core, parcel
In aluminum plastic film.The electrolyte that injection is made up of 1M lithium salts and mixed carbonic acid ester solvent.After being packaged
Battery is carried out to be melted into and aging, flexible-packed battery is obtained, Cell1 is designated as.
Embodiment 2
The preparation of negative plate N2.Compared according to weight is Delanium：Polyethylene glycol graft modification konjaku Portugal
Mannosan：Polyacrylate：Vapor-grown carbon fibers：Water=98:0.2:0.8:1:100 ratio, weighs each
Component；Then high-speed stirred is carried out to each component for weighing, finely dispersed negative slurry is obtained, by this
Slurry is equably coated in Copper Foil two sides, is compacted by drying, roll squeezer, obtains negative plate and is designated as N2.
The preparation of positive plate P2.According to weight compare for nickle cobalt lithium manganate, Kynoar, conductive black and
1-METHYLPYRROLIDONE is according to 92:4:4:45 ratios, weigh each component, then carry out height to each component for weighing
Speed stirring, obtains finely dispersed anode sizing agent.The slurry is equably coated in aluminium foil two sides, by drying,
Roll squeezer is compacted, and obtains positive plate and is designated as P2.
The preparation of lithium ion battery Cell2.Conductive lug is welded on positive plate P2 and negative plate N2, will
Polypropylene, polyethylene composite isolated film is positioned in the middle of positive pole and negative pole, is wound to form naked battery core, parcel
In aluminum plastic film.The electrolyte that injection is made up of 1M lithium salts and mixed carbonic acid ester solvent.After being packaged
Battery is carried out to be melted into and aging, flexible-packed battery is obtained, Cell2 is designated as.
Embodiment 3
The preparation of negative plate N3.Compared according to weight is silicon-base alloy powder：Polysiloxane-grafted modified evil spirit
Taro glucomannans：Polyacrylamide：Multi-walled carbon nano-tubes：Water=97.5:0.5:1.0:1:90 ratio, claims
Each component is taken, each component that will be weighed carries out high-speed stirred, obtains finely dispersed cathode size；Will
The slurry is equably coated in Copper Foil two sides, is compacted by drying, roll squeezer, obtains negative plate and is designated as N3.
The preparation of positive plate P3.Compared according to weight is nickel cobalt lithium aluminate：Kynoar：Conductive black：
1-METHYLPYRROLIDONE=93:3.5:3.5:50 ratio, weighs each component, each component that then will be weighed
High-speed stirred is carried out, finely dispersed anode sizing agent is obtained；The slurry is equably coated in aluminium foil two sides, is passed through
Dry, roll squeezer compacting is crossed, positive plate is obtained and is designated as P3.
The preparation of lithium ion battery Cell3.Conductive lug is welded on positive plate P3 and negative plate N3, will
Polypropylene, polyethylene composite isolated film is positioned in the middle of positive pole and negative pole, is wound to form naked battery core, parcel
In aluminum plastic film.The electrolyte that injection is made up of 1M lithium salts and mixed carbonic acid ester solvent.After being packaged
Battery is carried out to be melted into and aging, flexible-packed battery is obtained, Cell3 is designated as.
Embodiment 4
The preparation of negative plate N4.Compared according to weight is the sub- silicon micron particles of oxidation：Grafting polyethylene imine
Modified konjaku glucomannans：Polyimides：Conductive black：Water=97:1:11:1:80 ratio, weighs each
Component, each component that then will be weighed carries out high-speed stirred, obtains finely dispersed cathode size；Will
The slurry is equably coated in Copper Foil two sides, is compacted by drying, roll squeezer, obtains negative plate and is designated as N4.
The preparation of positive plate P4.Compared according to weight is LiFePO4：Kynoar：Conductive carbon black：
1-METHYLPYRROLIDONE=97:1.5:1.5:70 ratio, weighs each component, each component that then will be weighed
High-speed stirred is carried out, finely dispersed anode sizing agent is obtained；The slurry is equably coated in aluminium foil two sides, is passed through
Dry, roll squeezer compacting is crossed, positive plate is obtained and is designated as P4.
The preparation of lithium ion battery Cell4：Conductive lug is welded on positive plate P4 and negative plate N4, will
Polypropylene, polyethylene composite isolated film is positioned in the middle of positive pole and negative pole, is wound to form naked battery core, parcel
In aluminum plastic film.The electrolyte that injection is made up of 1M lithium salts and mixed carbonic acid ester solvent.After being packaged
Battery is carried out to be melted into and aging, flexible-packed battery is obtained, Cell4 is designated as.
Comparative example 1
Difference from Example 1 is that to be compared according to weight be native graphite：Butadiene-styrene rubber：Carboxymethyl
Sodium cellulosate：Conductive black：Water=94:2:2.6:1.4:100 ratio prepares negative plate, so obtained by
Negative plate is designated as N5.
With P1 as positive pole, N5 is negative pole, and other conditions obtain lithium ion battery, are designated as with embodiment 1
Cell5。
Further illustrated below by way of experimental data anode plate for lithium ionic cell provided in an embodiment of the present invention and
Use the various performances of the lithium ion battery of the negative plate.
(1) the cryogenic property contrast of .Cell1 and Cell5
Charged with the current versus cell of 0.5C at 25 DEG C until voltage is as 4.2V, to the battery that charges with 0.5C
Current discharge until 2.5V, this discharge capacity is designated as the discharge capacity at 25 DEG C；Equally at 25 DEG C with 0.5C
Current versus cell charge until voltage be 4.2V, respectively 0 DEG C, -10 DEG C and -20 DEG C to charge battery
With the current discharge of 0.5C up to 2.5V, this discharge capacity is designated as putting at 0 DEG C, -10 DEG C and -20 DEG C respectively
Capacitance.The discharge capacity percentage first of discharge capacity at 0 DEG C, -10 DEG C and -20 DEG C and battery at 25 DEG C
Used as 0 DEG C of battery, -10 DEG C and -20 DEG C of discharge capacity ratios, test result refers to table 1.
The lithium ion battery cryogenic property of the embodiment 1 of table 1 and comparative example 1
As shown in Table 1, the lithium ion battery of embodiment 1 is in -20 DEG C/25 DEG C low temperature capacity conservation rates
71.38%, and comparative example 1 is only 53.84% in -20 DEG C/25 DEG C of low temperature capacity conservation rate, in view of of the invention
The performance of the lithium ion battery that embodiment is provided has good homogeneity and stability, it is obvious that the present invention
The lithium ion battery that embodiment is provided has more preferable cryogenic property.
(2) the high rate performance contrast of .Cell1 and Cell5
Charged with the current versus cell of 0.5C until voltage is as 4.2V, to the battery that charges with the electric current of 0.5C
Electric discharge is designated as the discharge capacity of 0.5C up to 2.5V, this discharge capacity；The same current versus cell with 0.5C
Charge until voltage is 4.2V, respectively in the battery to charging with the current discharge of 1C, 2C and 3C until
2.5V, this discharge capacity is designated as the discharge capacity under 1C, 2C and 3C respectively.Under 1C, 2C and 3C
The discharge capacity percentage of 0.5C discharges as 1C, 2C and 3C of battery and holds first for discharge capacity and battery
Amount ratio, test result refers to table 2.
The lithium ion battery high rate performance of the embodiment 1 of table 2 and comparative example 1
As known from Table 2, the capability retention of the 3C/0.5C of the lithium ion battery of embodiment 1 is 84.27%,
And the capability retention of the 3C/0.5C of the lithium ion battery of comparative example 1 is only 71.56%.In view of the present invention is real
The performance for applying the lithium ion battery of example offer has good homogeneity and stability, it is obvious that embodiment 1
Lithium ion battery there is more preferable high rate performance, that is, lithium ion battery provided in an embodiment of the present invention tool
There is more preferable high rate performance.
(3) the normal-temperature circulating performance contrast of .Cell1 and Cell5
Charged with the current versus cell of 1C at 25 DEG C until voltage is as 4.2V, to the battery that charges with 1C
Current discharge until 2.5V, recharge discharge cycles 250 times；The electric discharge of battery is recorded in cyclic process
Capacity, using the discharge capacity of the 250th time and first time discharge capacity percentage as capability retention, tests
The results detailed in Figure of description 1.
From Figure of description 1, the lithium ion battery of embodiment 1 in normal temperature circulation test, protect by capacity
Holdup is 92.17%, and the respective volume conservation rate of the lithium ion battery of comparative example 1 is only 80.17%.It is aobvious
So, the lithium ion battery of embodiment 1 has more preferable cycle performance.Further, in view of the present invention is implemented
The performance of the lithium ion battery that example is provided has good homogeneity and stability, provided in an embodiment of the present invention
Lithium ion battery has better cycle performance.
In sum, lithium ion battery negative batch mixing provided in an embodiment of the present invention and by the negative pole batch mixing prepare
Negative pole, and the lithium ion battery being further manufactured into, due to only have in negative plate active material have lithium from
Sub- conductive performance, and graft modification konjak glucomannan thickener not only have submissive strand but also
There is good lithium ion conduction ability, in conjunction with conventional binders so that total consumption of thickener and binding agent
Fewer than NaCMC/SBR composite binders, activity substance content is higher in negative plate, so low temperature and multiplying power
Performance is more preferable；Particularly in cyclic process, the possibility that side reaction occurs is greatly reduced, so battery
Capacity holding capacity is also obviously improved.Remaining embodiment equally has identical result, only because of the invention
Material property is sufficiently stable, to save space, here with regard to not carrying out performance test one by one to other embodiment
With analysis.
Presently preferred embodiments of the present invention is the foregoing is only, is not intended to limit the invention, it is all in this hair
Any modification, equivalent or improvement made within bright spirit and principle etc., should be included in the present invention
Protection domain within.
Claims (9)
1. a kind of lithium ion battery negative batch mixing, including negative active core-shell material, conductive agent, thickener and bonding
Agent, it is characterised in that：The thickener is graft modification konjak glucomannan.
2. lithium ion battery negative batch mixing as claimed in claim 1, it is characterised in that：The graft modification
Konjak glucomannan accounts for the 0%~1.0% of the lithium ion battery negative batch mixing gross mass percentage.
3. the lithium ion battery negative batch mixing as described in claim 1~2 is any, it is characterised in that：It is described to connect
Branch modified konjaku glucomannans is polyethylene glycol oxide graft modification konjak glucomannan, PPOX connects
Branch modified konjaku glucomannans, polyethylene glycol graft modification konjak glucomannan, polysiloxane-grafted change
Property konjak glucomannan, polyethylene glycol succinate graft modification konjak glucomannan, polyethyleneimine
At least one in graft modification konjak glucomannan and polyacrylonitrile-grafted modified konjak glucomannan.
4. the lithium ion battery negative batch mixing as described in claim 1~2 is any, it is characterised in that：It is described to connect
The weight average molecular weight of branch modified konjaku glucomannans is 1 × 106~2 × 106。
5. the lithium ion battery negative batch mixing as described in claim 1~2 is any, it is characterised in that：It is described viscous
Knot agent be Kynoar, butadiene-styrene rubber, polyvinyl alcohol, polyacrylate, polymethyl methacrylate,
At least one in polyacrylamide, polyamic acid, polyimides, polyamidoimide and sodium alginate.
6. the lithium ion battery negative batch mixing as described in claim 1~2 is any, it is characterised in that：It is described negative
Pole active material is native graphite, Delanium, surface modified natural graphite, hard carbon, soft carbon, interphase
Carbosphere, polysilicon micro wire, polysilicon nanometer particle, silicon-base alloy powder, the sub- silicon micron particles of oxidation
In at least one.
7. the lithium ion battery negative batch mixing as described in claim 1~2 is any, it is characterised in that：It is described to lead
Electric agent is conductive black, electrically conductive graphite, vapor-grown carbon fibers, multi-walled carbon nano-tubes, SWCN
And at least one in Graphene.
8. a kind of lithium ion battery negative, including negative electrode active layer, it is characterised in that：The negative electrode active layer
Lithium ion battery negative batch mixing as described in as any such as claim 1~7 is formed.
9. a kind of lithium ion battery, it is characterised in that：The negative pole of the lithium ion battery is claim 8 institute
The lithium ion battery negative stated.
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