CN106159269B - A kind of preparation method of high-voltage lithium ion batteries cathode pole piece - Google Patents
A kind of preparation method of high-voltage lithium ion batteries cathode pole piece Download PDFInfo
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- CN106159269B CN106159269B CN201610855255.5A CN201610855255A CN106159269B CN 106159269 B CN106159269 B CN 106159269B CN 201610855255 A CN201610855255 A CN 201610855255A CN 106159269 B CN106159269 B CN 106159269B
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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
- H01M4/36—Selection of substances as active materials, active masses, active liquids
- H01M4/58—Selection of substances as active materials, active masses, active liquids of inorganic compounds other than oxides or hydroxides, e.g. sulfides, selenides, tellurides, halogenides or LiCoFy; of polyanionic structures, e.g. phosphates, silicates or borates
- H01M4/583—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
- 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
- H01M4/139—Processes of manufacture
- H01M4/1393—Processes of manufacture of electrodes based on carbonaceous material, e.g. graphite-intercalation compounds or CFx
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Abstract
The invention discloses a kind of preparation methods of high-voltage lithium ion batteries cathode pole piece, it is that acylate is added in the negative electrode slurry of traditional lithium ion battery, the SEI film of initial state is artificially formed in negative terminal surface, it is participated directly in when cell activation in the reaction to form SEI film, modify the Interface Construction of electrolyte and negative electrode material, SEI membrane component is reformed to improve its SEI membrane stability and lithium ion transport, reaches and electrolyte under high voltage is prevented to generate in side reactions such as the continual decomposition of negative terminal surface.The negative pole piece of battery can be very good to be applied in high-voltage lithium ion batteries, improve the cycle performance of full battery under high voltage, solve the problems, such as that novel high voltage positive electrode lacks the good graphite cathode material of compatibility, the bottleneck that lithium ion battery with high energy density under high voltage is difficult to industrialized development is more importantly broken through, so that becoming a reality from level angle is improved to promote the energy density of current lithium ion battery.
Description
Technical field
The present invention relates to lithium ion battery, the preparation method of specifically a kind of high-voltage lithium ion batteries cathode pole piece.
Background technique
Since nineteen ninety Sony, company produces first generation commercial Li-ion batteries, just occupies on existing market very big
Share, and growth momentum rapidly increases, the especially excessive exploitation due to people to non-renewable energy resources such as petroleum, coals in recent years
Using the speed for accelerating fossil resource exhaustion, and severe Global Environmental Problems are thus brought, people have to send out energetically
Renewable energy as electric energy is opened up, wherein electric energy most study is how effectively to be stored and reasonable utilization.
Compared with traditional secondary cell (plumbic acid, ni-Cd, nickel-metal hydride battery etc.), lithium ion battery has higher energy density and work electricity
Pressure has low pollution and longer service life, already takes up more and more markets, be efficient energy-storage travelling wave tube and electric energy
Release system.However, development and industry requirement relative to modernization, such as artificial intelligence, mobile phone, video camera, notes
The portable electronic devices such as sheet, mobile phone, lower energy density hinder its development space and application range significantly, especially
More there is an urgent need to the lithium ion batteries of high-energy density for the development of electric car.The energy density of lithium ion by operating voltage and
The capacity of material determines that improving its operating voltage is to improve a simple possible method of battery energy density.For example, existing quotient
Use LiCoO2Charge cutoff voltage be 4.2V, corresponding specific capacity be 140 mAh g-1.Improve its charge cutoff voltage extremely
About 190 mAh g can be obtained when 4.5V-1Specific capacity, significantly improve its energy density.However, corresponding under high voltage
Battery side reaction aggravates, electrolyte decomposition, and full battery is difficult to accomplish actuals, service society under high voltage.Equally, with
LiNi0.5Mn1.5O4It (LNMO) is the spinel structure high-voltage anode material of representative, there is 4.7V(Vs Li+/ Li) high voltage
Charge and discharge platform, 146.7 mAh g of specific capacity-1, actual energy density can achieve even more than 220wh/kg, and list at this stage
Body battery energy density is only 110 ~ 150whkg-1, and the cheap method of LNMO positive electrode preparation cost is simple, has excellent
Different high rate during charging-discharging and it is highly-safe the advantages that.Unfortunately, LNMO/ graphite full battery is based on existing skill
Art, chemical property are also not up to the specific capacity of actual application level, especially full battery as circulation is occurred substantially
The decaying of degree constrains the development of its high-voltage high-energy-density lithium ion battery significantly.Except, also there are many kinds of high electricity at present
Press positive electrode, such as phosphate-based LiCoPO4、LiMnPO4Deng there is also same problem, therefore realize under high voltage
Its key of the commercial Li-ion batteries system of high-energy density, which is that, develops matched negative electrode material and electrolyte.
In order to improve the chemical property of lithium ion full battery under high voltage, high-voltage electrolyte additive, optimization are explored
Electrolyte prescription is also an important channel, but additive itself also can the performance of resistance and capacity to battery have an impact.
Starting point of the invention is explored in terms of cathode, proposes solid electrolyte film directly most violent from cell reaction
(SEI) set about, for trying to be modified and be modified on SEI film under high voltage condition；In addition, being based on graphite material through statistics
It is resourceful, preparation is simple and inexpensive etc., and in present lithium ion battery practical, commercial, graphitic carbon material is still accounted for
The leading position of the negative electrode material of lithium ion battery.Therefore, high-voltage lithium of the invention is also in graphite with negative electrode material
It is carried out on material, there is direct commercial value, production can be direct plungeed into.
Summary of the invention
To solve current high-voltage lithium ion full battery poor circulation, capacity attenuation serious problems, the present invention provides one
The preparation method of kind high-voltage lithium ion batteries cathode pole piece, it is complete to promote high-voltage lithium ion in terms of negative electrode of lithium ion battery
The cycle performance of battery, to realize its commercial value.
Realizing the technical solution of the object of the invention is:
A kind of preparation method of high-voltage lithium ion batteries cathode pole piece, comprising the following steps:
(1) first a certain amount of binder is dissolved in deionized water, uniform aqueous viscous syrup mother liquor is made；
(2) then conductive agent and negative electrode material are added in slurry mother liquor, after evenly dispersed, organic acid esters mixing is added
Mashing, is made negative electrode slurry；
(3) negative electrode slurry made from step (2) is placed in vacuum state -0.08MPa ~ -0.1MPa, keeps vacuum time
0.5h ~ 20h, true temp are controlled at 20 ~ 50 DEG C, guarantee that acylate is distributed to negative electrode material surface；
(4) step (3) slurry is sieved to obtain fineness to be 15 ~ 45um, is coated in using roller coating or spraying method negative
The cathode pole piece that surface has initial state SEI membrane structure is obtained on the copper-foil conducting electricity of pole, after drying, is assembled into battery with anode pole piece
System finally is melted into obtain and stablizes SEI film using constant current 0.02C ~ 0.5C；
The ingredient of the cathode is made of negative electrode material, conductive agent, binder and organic acid esters, and ratio is respectively:
Negative electrode material 75 ~ 90%
Binder 1 ~ 5%
Conductive agent 2 ~ 5%
Organic acid esters 1 ~ 20%
It being dissolved in deionized water after the completion of ingredient and obtains negative electrode slurry, slurry solid content is 25 ~ 55%, viscosity is 1000 ~
5000 mPa.s。
In above-mentioned preparation method, step (2) the mashing temperature is 20 ~ 50 DEG C, and humidity is 5 ~ 20%.
The coating speed of step (4) described roll coating model is 3 ~ 10m/min, and baking temperature is 70 ~ 110 DEG C；Spraying method
Coating speed be 5 ~ 13m/min, oven temperature be 70 ~ 110 DEG C；Be made cathode pole piece with a thickness of 0.02 ~ 0.2mm.
The negative electrode material is at least one of natural graphite, artificial graphite, composite graphite, soft carbon, hard carbon.
The conductive agent is electrically conductive graphite (including SP, KS-6, carbon nanotube)；At least one of carbon fiber (CF).
The binder is aqueous hydroxymethyl cellulose (CMC), butadiene-styrene rubber (SBR), at least one in binder LA133
Kind.
The organic acid esters is at least one of organic titanate, organosilicon acid esters, organophosphorus ester
It can be with the anode of following high voltage type using high-voltage lithium ion batteries cathode pole piece prepared by the method for the present invention
Material, which matches, prepares business full battery: the LiMn of spinel structure2O4, LiNi0.5Mn1.5O4, LizNixMn1-xO2；
LizCo1-(x+y)NixMnyO2(wherein, x, y, x+y < 1, z >=1)；Olivine structural LiMPO4Or Li2MPO4F (M=Co, Mn, Ni)；
LiNiVO4, LiMeSO4F (Me=Co, Ni, Cu), high voltage stratiform LiCoO2(charge cutoff voltage >=4.3V).
The method of the present invention is to be modified in negative terminal surface using organic acid esters, and organic acid esters participates in charge and discharge process
To the formation of SEI film, the interfacial structure of electrolyte and negative electrode material is modified, reforms SEI membrane component to improve its SEI membrane stability
With lithium ion transport, reaches and electrolyte under high voltage is prevented to generate in side reactions such as the continual decomposition of negative terminal surface.
Cathode pole piece of the invention is mainly used as being higher than the lithium ion battery of 4.3V, traditional lithium-ion electric in operating voltage
Cell voltage is generally in 4.0V or less (LiCoO2/ carbon material, LiFePO4/ carbon material, LiMn2O4/ carbon material etc.), such as China
The cathode pole piece of patent CN201210221178 preparation is also to be applied in low-voltage lithium battery, to organic electrolyte under this voltage
Oxygenolysis is limited.For energy density angle, the voltage for promoting lithium battery necessarily brings the promotion of energy density, and voltage is got over
High-energy density is higher, but can cause the fast decoupled of electrolyte when voltage is higher than 4.3V, and decomposition product is attached to cathode table
Face forms thicker SEI film and hinders the transmission channel of lithium ion that cycle life of lithium ion battery reduction and the quick of capacity is caused to decline
Subtract, when charging voltage is to 4.8V, battery is substantially without circulation volume.
The preparation method of high-voltage lithium ion batteries cathode pole piece of the present invention is compared with present technology:
(1) present invention is grown up on traditional cathode material of lithium ion battery basis, is used as high voltage lithium
Ion battery cathode material, preparation method simple possible is at low cost to be easily achieved, be fully applicable to scale, high-volume,
Industrialized production.
(2) negative pole piece of battery obtained by the present invention can be very good to be applied in high-voltage lithium ion batteries, apply
To existing LiNi0.5Mn1.5O4, high voltage LiCoO2, Li3V2(PO4)3, LiCoPO4, Li2CoPO4F, Li2FeSiO4,
Li2FePO4The novel high voltages positive electrode such as F improves the cycle performance of full battery under high voltage, solves novel high voltage anode
The good graphite cathode material problem of material shortage compatibility, it is often more important that break through high energy density lithium ion electricity under high voltage
Pond is difficult to the bottleneck of industrialized development, so that the energy density for promoting current lithium ion battery from level angle is improved becomes existing
It is real.
(3) preparation method of the present invention compared that inorganic additive (Li is added2CO3) preparation cathode pole piece, the present invention preparation
Cathode pole piece can preferably be suitable for high voltage under battery system.Relative to the reaction under low-voltage, under high voltage
More stern challenge is proposed for lithium ion battery negative material, not only to guarantee first charge discharge efficiency and the electrochemistry such as specific capacity is big
Function admirable, but also to guarantee minimum to the heterocatalysis of electrolyte effect under its high voltage, experiment shows relative to inorganic
Object cathode additive agent, organic acid esters participate in preferably in charge and discharge process in situ in the formation of SEI film, solidification and modification
SEI film construction prevents the further decomposition of electrolyte.
Detailed description of the invention
Fig. 1 is that negative pole piece of battery prepared by comparative example 1,2 and the embodiment of the present invention 1,2,3 matches 4.7V high-voltage anode
The full battery first charge-discharge correlation curve that LNMO is assembled into；
Fig. 2 is that negative pole piece of battery prepared by comparative example 1,2 and the embodiment of the present invention 1,2,3 matches 4.7V high-voltage anode
The full battery cycle performance correlation curve that LNMO is assembled into
Fig. 3 is that negative pole piece of battery prepared by comparative example 1 and the embodiment of the present invention 1,2,3 matches 4.7V high-voltage anode
The discharge curve for the full battery difference cycle-index that LNMO is assembled into, is the 1st, 5,10,20,50 discharge curve respectively
Figure.
Specific embodiment
The content of present invention is described in further detail with attached drawing combined with specific embodiments below, but the present invention does not limit to
In these following embodiments.
Comparative example 1
The conventional anode pole piece prepared using common graphite, is included the following steps:
(1) 3% CMC is dissolved in deionized water, viscous syrup mother liquor is made；
(2) conductive agent that 2% is added after slurry mother liquor is sufficiently mixed is mixed with electrocondution slurry；
(3) after evenly dispersed, 90% natural graphite material, 25 DEG C of temperature of control mashing, humidity 10% is added；
(4) after mixing to material, adjustment slurry viscosity is 4000mPa.s, solid content 48%；
(5) slurry is placed in vacuum state -0.08MPa, keeps this vacuum state 5h, 25 DEG C of true temp；
(6) after being 30um by fineness after the slurry made sieving, negative conductive copper foil is coated in by way of roller coating
Or on copper mesh, coating speed 5m/min, baking oven baking temperature is distributed wherein 95 DEG C of maximum temperature, both sides lowest temperature in ladder
85 DEG C of degree, obtains cathode with a thickness of 0.168mm, the surface density 104g/m of cathode single side after drying2。
Comparative example 2
Using conventional anode additive Li2CO3The graphite negative electrode of lithium ion battery pole piece of preparation, includes the following steps:
Step (1)-(2) are identical as comparative example 1, and it is that 1wt% is inorganic that content, which is added, in step (3) after natural graphite is added
Li2CO3Aqueous solution as a kind of cathode additive agent；Adjust slurry viscosity 4000mPa.s, solid content 48%；As comparative example 1 after
Continuous to carry out vacuumizing, sieving and coating, drying is obtained containing inorganic Li2CO3The cathode pole piece of additive, negative electrode tab thickness and
Single side surface density is identical as comparative example 1.
Inorganic Li2CO3As a kind of one of the main constituents of SEI film, it can effectively reduce electrolyte and formed
The degree of decomposition of SEI film improves the first charge discharge efficiency of lithium ion battery in Battery formation process stages, to the circulation longevity for improving battery
Life, which has in important role, and present battery system, is commonly used as additive common in negative electrode slurry ingredient.
Embodiment 1
High-voltage lithium ion batteries cathode pole piece is prepared using the method for the present invention, is included the following steps:
Step (1)-(2) are identical as comparative example 1, and the organic of mass fraction 10% is added in step (3) after natural graphite is added
Titanate esters；Adjust slurry viscosity 4000mPa.s, solid content 48%；As comparative example 1 continues vacuumizing, sieving and painting
Cover, drying later i.e. obtain surface have initial state organic titanate SEI membrane structure cathode pole piece, the thickness of cathode pole piece and
Single side surface density is identical as comparative example 1.After Battery formation, organic titanate participates in and modifies SEI film, reaches stable SEI film
Effect, more high voltage withstanding condition.
Embodiment 2
High-voltage lithium ion batteries cathode pole piece is prepared using preparation method of the present invention, is included the following steps:
Step (1)-(2) are identical as comparative example 1, and the organic of mass fraction 15% is added in step (3) after natural graphite is added
Titanate esters；Adjust slurry viscosity 4000mPa.s, solid content 48%；As comparative example 1 continues vacuumizing, sieving and painting
It covers, drying obtains the cathode pole piece that surface has initial state SEI membrane structure later.
Embodiment 3
High-voltage lithium ion batteries cathode pole piece is prepared using preparation method of the present invention, is included the following steps:
Step (1)-(2) are identical as comparative example 1, and the organic of mass fraction 10% is added in step (3) after natural graphite is added
Phosphate；Adjust slurry viscosity 4000mPa.s, solid content 48%；As comparative example 1 continues vacuumizing, sieving and painting
It covers, drying obtains the cathode pole piece that surface has initial state SEI membrane structure later.
Lithium ion battery negative electrode prepared by the various embodiments described above and comparative example with high-voltage anode material LNMO
Full battery performance test parameter with composition, as shown in table 1.
This table test data is based on LAND electrochemical test system, test condition: full battery cycle performance test electricity
3.4 ~ 4.8V of range is pressed, first charge-discharge first twice, then with 1C constant current charge-discharge carries out 60 circulation (wherein 1C with 0.5C circulation
=146.7mAh/g).
Table 1
As can be seen from Table 1, the high voltage full battery first charge discharge efficiency of ordinary graphite cathode pole piece assembling is than the present invention
The full battery of the high voltage cathode pole piece assembling of preparation is all universal low, it is meant that its surface shape using common graphite as battery cathode
Decomposition that is unstable at SEI film and not can effectively prevent electrolyte, side reaction are higher by cathode pole piece prepared by the present invention significantly.
Equally, capacity retention ratio data also demonstrate cathode pole piece prepared by the present invention condition under high voltages after full battery 60 times circulations
Lower function admirable, capacity attenuation trend is slow as the cycle progresses, improves the actual use longevity of high-voltage lithium ion batteries
Life.In addition, full battery the 2nd time and the 60th time circulation electric discharge average voltage of ordinary graphite cathode pole piece assembling is significantly lower than this
Full battery prepared by the embodiment 1,2,3 of invention illustrates the complete of ordinary graphite cathode pole piece cathode pole piece composition more of the invention
The side reaction of inside battery serious polarization, generation is more.
Referring to Fig.1, the negative pole piece of battery that prepared by comparative example 1,2 and the embodiment of the present invention 1,2,3 matches 4.7V high voltage
The full battery first charge-discharge correlation curve that positive LNMO is assembled into, as can be seen from the figure: the embodiment of the present invention 1,2,3 is than general
Discharge platform maintains 4.6V or so to the LNMO full battery for the cathode pole piece assembling that logical graphite is prepared for the first time and platform is flatter,
The discharge platform of common graphite comparative example is unobvious, tilt and discharge voltage plateau is significantly lower than 4.6V.It is flat in conjunction with initial charge
Platform can may determine that the potential difference of comparative example 1 is substantially greater than the present invention according to the potential difference being charged and discharged between platform
Embodiment 1,2,3, illustrate that cathode pole piece that common graphite obtains is used as in high-voltage battery, battery polarization is serious, side reaction
It is more.In addition, side reaction embodiment be most obviously for the first time formed SEI film during, side reaction degree direct influence electricity
The first charge discharge efficiency in pond, first charge discharge efficiency is high, illustrates that side reaction is small；First charge discharge efficiency is low, it is meant that side reaction is violent.According to charge and discharge for the first time
Electric data and table 1 are this it appears that the full battery first charge discharge efficiency that the cathode pole piece comparative example 1 of common graphite preparation is assembled into
Only 59.82% is significantly lower than cathode pole piece prepared by the present invention, and the cathode pole piece for showing that the present invention obtains can be in high voltage
The lower generation for reducing side reaction.It is noted that tradition incorporation Li2CO3Obtained cathode pole piece also has higher imitates for the first time
Rate, this illustrates Li2CO3Addition also inhibit decomposition to electrolyte when forming SEI film for the first time.
Referring to Fig. 2, negative pole piece of battery prepared by comparative example 1,2 and the embodiment of the present invention 1,2,3 matches 4.7V high voltage
The full battery cycle performance correlation curve that positive LNMO is assembled into, as can be seen from the figure: cathode pole piece made from common graphite
In high voltage LNMO full battery, capacity attenuation is serious as the cycle progresses, and capacity is only initial holds after the 50th circulation
The 83.10% of amount；And the embodiment of the present invention 3 there is no decaying with the capacity that gos deep into of circulation, capacity is after the 50th circulation
The 97.51% of initial capacity embodies cycle life stable under high voltage.In addition, comparative example 2 is tradition incorporation Li2CO3It obtains
Although cathode pole piece the battery ratio with higher within initial 10 circulations can be seen that according to full battery cyclic curve
Capacity, but specific capacity capacity rapid decay as the cycle progresses after 10 circulations illustrates through tradition addition Li2CO3Preparation
Cathode pole piece is not appropriate for the lithium ion battery of high voltage system.
Referring to Fig. 3, negative pole piece of battery matching 4.7V high voltage prepared by comparative example 1 and the embodiment of the present invention 1,2,3 is just
Full battery the 1st, 5,10,20, the 50 time discharge curve that pole LNMO is assembled into, Cong Tuzhong is this it appears that different numbers
The attenuation degree of lower voltage platform state and capacity, by referring to Fig. 3 it can be seen that compared to 1 the embodiment of the present invention 1 of comparative example,
2,3 full battery discharge platform holding consistencies are good, while being consistent property of capacity is also very good, illustrate using the method for the present invention
The cathode pole piece prepared can be completely suitable for the lithium-ion battery system and function admirable of high voltage system.
Claims (4)
1. a kind of preparation method of high-voltage lithium ion batteries cathode pole piece, which comprises the following steps:
(1) first a certain amount of binder is dissolved in deionized water, uniform tackiness slurry mother liquor is made；
(2) then conductive agent and negative electrode material are added in slurry mother liquor, after evenly dispersed, organic acid esters mixing are added and beats
Slurry, is made negative electrode slurry；
(3) negative electrode slurry made from step (2) is placed in vacuum state -0.08MPa ~ -0.1MPa, keeps vacuum time 0.5h
~ 20h, true temp are controlled at 20 ~ 50 DEG C, guarantee that acylate is distributed to negative electrode material surface；
(4) step (3) slurry is sieved to obtain fineness to be 15 ~ 45um, is led using roller coating or spraying method coated in cathode
The cathode pole piece that surface has initial state SEI membrane structure is obtained on electrolytic copper foil, after drying, is assembled into cell body with anode pole piece
System finally is melted into obtain and stablizes SEI film using constant current 0.02C ~ 0.5C；
The ingredient of the cathode is made of negative electrode material, conductive agent, binder and organic acid esters, and ratio is respectively:
Negative electrode material 75 ~ 90%
Binder 1 ~ 5%
Conductive agent 2 ~ 5%
Organic acid esters 1 ~ 20%
It is dissolved in deionized water after the completion of ingredient and obtains negative electrode slurry, slurry solid content is 25 ~ 55%, and viscosity is 1000 ~ 5000
mPa.s；
Step (2) organic acid esters is at least one of organic metatitanic acid acid esters, organosilicon acid esters, and mashing temperature is 20 ~ 50
DEG C, humidity is 5 ~ 20%；
The coating speed of step (4) described roll coating model is 3 ~ 10m/min, and baking temperature is 70 ~ 110 DEG C；The painting of spraying method
Cloth speed is 5 ~ 13m/min, and oven temperature is 70 ~ 110 DEG C；Be made cathode pole piece with a thickness of 0.02 ~ 0.2mm.
2. the preparation method of high-voltage lithium ion batteries cathode pole piece according to claim 1, it is characterised in that: described negative
Pole material is at least one of natural graphite, artificial graphite, composite graphite, soft carbon, hard carbon.
3. the preparation method of high-voltage lithium ion batteries cathode pole piece according to claim 1, it is characterised in that: described viscous
Tying agent is at least one of aqueous hydroxymethyl cellulose CMC, styrene butadiene rubber sbr, binder LA133.
4. the high-voltage lithium ion batteries cathode pole piece of preparation method preparation according to claim 1-3 is answered
Being matched with the positive electrode of, it is characterised in that: the high-voltage lithium ion batteries cathode pole piece and following high voltage type, it is complete to prepare
Battery, the LiMn of spinel structure2O4, LiNi0.5Mn1.5O4, LizNixMn1-xO2；LizCo1-(x+y)NixMnyO2, wherein x, y, x+
Y < 1, z >=1；Olivine structural LiMPO4Or Li2MPO4F, M=Co, Mn, Ni；LiNiVO4, LiMeSO4F, Me=Co, Ni, Cu；
High voltage stratiform LiCoO2, charge cutoff voltage >=4.3V.
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| CN104810550A (en) * | 2014-06-13 | 2015-07-29 | 万向A一二三系统有限公司 | Preparation method of functional additive-containing lithium ion battery |
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