CN106328925A - Lithium ion secondary battery and positive pole piece thereof - Google Patents
Lithium ion secondary battery and positive pole piece thereof Download PDFInfo
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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
- H01M4/48—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides
- H01M4/50—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides of manganese
- H01M4/505—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides of manganese of mixed oxides or hydroxides containing manganese for inserting or intercalating light metals, e.g. LiMn2O4 or LiMn2OxFy
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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
- H01M4/36—Selection of substances as active materials, active masses, active liquids
- H01M4/48—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides
- H01M4/52—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides of nickel, cobalt or iron
- H01M4/525—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides of nickel, cobalt or iron of mixed oxides or hydroxides containing iron, cobalt or nickel for inserting or intercalating light metals, e.g. LiNiO2, LiCoO2 or LiCoOxFy
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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
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- 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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- H01M4/623—Binders being polymers fluorinated polymers
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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
- H01M4/624—Electric conductive fillers
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Abstract
The invention discloses a lithium ion secondary battery and a positive pole piece used by the same. The positive pole piece comprises a positive current collector and an active material layer covered on the positive current collector, wherein the active material layer contains a positive active material; the positive electrode active material contains LiNi1/3Co1/3Mn1/3O2And high Ni lithium nickel cobalt metal oxide LiNixCoyM1‑x‑yO2Wherein x is not less than 0.5 and 0<Y<0.5. Compared with the prior art, the lithium ion secondary battery positive pole piece can obviously improve the cycle performance of the nickel-based lithium metal oxide positive pole piece with high Ni content on the premise of keeping high energy density, and can also improve the safety and reliability of the lithium ion battery assembled by the positive pole piece to a certain extent.
Description
Technical field
The invention belongs to technical field of lithium ion secondary, it is more particularly related to a kind of power lithium-ion rechargeable battery and anode pole piece thereof.
Background technology
Owing to lithium-ion-power cell can be as automobile dynamic system, substitute conventional fuel oil and provide power for automobile, thus alleviate consumption of petroleum, reducing simultaneously or stop the discharge of vehicle exhaust, therefore Ge great colleges and universities and Li electricity enterprise are all researching and developing and are promoting research and development and the application of automobile lithium rechargeable battery energetically both at home and abroad.
Automobile lithium rechargeable battery (commonly referred to electrokinetic cell) is different from the battery of the consumer electronics product that everybody commonly uses, such as battery of mobile phone.Electrokinetic cell requires that higher energy density meets driving and the mileage of automobile, it is desirable to higher cycle life meets the use cycle that fuel vehicle is same, it is desirable to higher security reliability safety need ensureing user etc..
Electrokinetic cell can positive electrode have a variety of, but all existence and stability difference or cycle performance difference etc. problem, it is difficult to meet the requirement of automobile dynamic system.Such as, nickel cobalt oxygen LiNiCoO is the positive electrode of a kind of high power capacity, but but because the reason such as heat stability extreme difference, life-span be shorter, it is difficult to meet the application demand of EV battery.Although there being research worker (such as patent CN102187510B) to propose by mixing ternary material LiNi1/3Co1/3Mn1/3O improves the heat stability of LiNiCoO battery, but but cannot improve the defect on its life-span, causes LiNiCoO away from the distance all too that reality is applied, and the fastest studied person " abandons ".By contrast, ternary material has been increasingly becoming the positive electrode that current driving force battery is favored the most, the development trend of the highest Ni ternary material cell positive material especially, including Al substituted NCA material, but its application because cycle performance is relatively poor and poor heat stability and spread receives certain restriction.
In view of this, a kind of energy density of necessary offer and the highest anode piece of lithium ion secondary battery of cycle performance.
Summary of the invention
It is an object of the invention to: a kind of energy density, cycle performance, security performance the most preferably anode piece of lithium ion secondary battery is provided, and the lithium rechargeable battery using this positive electrode is provided.
In order to realize foregoing invention purpose, present inventor is through further investigation, it is provided that a kind of anode piece of lithium ion secondary battery, and it includes plus plate current-collecting body and cover the active material layer on plus plate current-collecting body, comprising positive electrode active materials in active material layer；Described positive electrode active materials comprises LiNi1/3Co1/3Mn1/3O2Lithium nickel cobalt metal-oxide LiNi with high NixCoyM1-x-yO2, wherein, x>=0.5,0<Y<0.5.
Ni-based lithium metal oxide is synthesized, the most easily produces Li/Ni mixing during the highest synthesis of its Ni content, cause the cycle performance of lithium rechargeable battery to be deteriorated；The highest Ni material alkalescence is high, easily produces some irreversible by-products in battery core manufacturing process with the oxygen in air and aqueous vapor, causes pole piece resistance to become big, and internal resistance is higher, serious polarization, and cycle performance is poor.For keeping the energy density advantage of high Ni material, on materials synthesis sinters, take doping and cladding more, but often to sacrifice some other performances, and the amplitude changed is the least.The present invention is in order to effectively extend battery life, by mixed a certain proportion of LiNi1/3Co1/3Mn1/3O2, i.e. maintain the energy density advantage of high Ni material, significantly improve again cycle performance.LiNi1/3Co1/3Mn1/3O2There is prominent cycle performance, and energy density is also far longer than the LiFePO 4 material enjoying joyous drink at present, additionally, its Li/Ni mixing rate is low, polarize little, charge and discharge process preferentially completes embedding de-lithium, directly decrease the embedding de-lithium degree of depth of high Ni ternary material, weaken in cyclic process high Ni material surface structural damage, extend the cycle life of whole battery.LiNi1/3Co1/3Mn1/3O2Its surface alkalinty is the most relatively low, can to a certain degree reduce the amount of by-products of pole piece in a certain degree degree fall containing the high low slurry of Ni material or the degree of alkalinity of whole pole piece, have certain help to cycle performance.
As a kind of improvement of anode piece of lithium ion secondary battery of the present invention, the lithium nickel cobalt metal-oxide LiNi of described high NixCoyM1-x-yO2In, M is one at least in Mn or Al.
As a kind of improvement of anode piece of lithium ion secondary battery of the present invention, described LiNi1/3Co1/3Mn1/3O2With LiNixCoyM1-x-yO2Mass ratio be 1:1～1:9.
As a kind of improvement of anode piece of lithium ion secondary battery of the present invention, described LiNi1/3Co1/3Mn1/3O2Mass ratio in whole pole piece active material is 10～50%, preferably 20～35%；The lithium nickel cobalt metal-oxide LiNi of high NixCoyM1-x-yO2Mass ratio in pole piece active material is 50～90%, preferably 65～80%.
As a kind of improvement of anode piece of lithium ion secondary battery of the present invention, described active material layer also including, bonding agent polyvinylidene fluoride, polyvinylidene fluoride mass content in active material layer are 1～5%, preferably 2～3.5%.This is because polyvinylidene fluoride can be at high Ni (NCA or NCM) ternary material and LiNi1/3Co1/3Mn1/3O2Form network structure between positive electrode active materials granule, thus ensure that the combination between positive active particles and mixing, effectively improve the removal lithium embedded degree of depth of positive electrode active materials, and then be effectively improved composite positive pole (high Ni ternary material and LiNi1/3Co1/3Mn1/3O2Positive electrode active materials) cycle performance；Simultaneously when binding agent polyvinylidene fluoride addition is more than 5%, high-nickel material removal lithium embedded is limited serious by the organic polymer network formed, in charge and discharge process, easily form one layer of irreversible side reaction organic layer on its surface simultaneously, have a strong impact on the performance improvement of composite positive pole, when the addition of binding agent polyvinylidene fluoride is less than 1%, it is impossible at high Ni (NCA or NCM) ternary material and LiNi1/3Co1/3Mn1/3O2It is effectively formed converging network between positive electrode active materials granule.
As a kind of improvement of anode piece of lithium ion secondary battery of the present invention, described active material layer also including, conductive agent SP, conductive agent mass content in active material layer are 1～5%, preferably 2～3%.Conductive agent SP is the conductive network effect for playing necessity.
As a kind of improvement of anode piece of lithium ion secondary battery of the present invention, LiNixCoyM1-x-yO2With LiNi1/3Co1/3Mn1/3O2In pole piece manufacturing process, slurrying can be simultaneously introduced and be once coated with, it is possible to by bi-material separately coating, such as first coating contains LiNi on a current collectorxCoyM1-x-yO2The coating of material is (such as LiNi0.5Co0.2Mn0.3O2), then it is coated one layer of LiNi1/3Co1/3Mn1/3O2, or first it is coated with LiNi1/3Co1/3Mn1/3O2, it is coated LiNixCoyM1-x-yO2Material.Therefore, described LiNi1/3Co1/3Mn1/3O2Lithium nickel cobalt metal-oxide LiNi with high NixCoyM1-x-yO2May reside in the identical active material layer in anode pole piece, or each be present in the different activities material layer of stacking.
As a kind of improvement of anode piece of lithium ion secondary battery of the present invention, described anode pole piece includes at least two-layer active material layer, wherein, with the surface active material layer of electrolyte contacts with LiNi1/3Co1/3Mn1/3O2For positive electrode active materials, the active material layer below surface active material layer is with LiNixCoyM1-x-yO2For positive electrode active materials.What this structure ensured preferentially to complete embedding de-lithium in charge and discharge process is low nickel ternary material, decreases the embedding de-lithium degree of depth of high Ni ternary material, weakens in cyclic process high Ni material surface structural damage, extend the cycle life of whole battery.
As a kind of improvement of anode piece of lithium ion secondary battery of the present invention, the lithium nickel cobalt metal-oxide LiNi of described high NixCoyM1-x-yO2Including one or more materials.
In order to realize foregoing invention purpose, present invention also offers a kind of lithium rechargeable battery, it includes anode pole piece, cathode pole piece, electrolyte and is interval in the isolating membrane between both positive and negative polarity pole piece, and described anode pole piece is the anode piece of lithium ion secondary battery described in any of the above-described paragraph.
Compared with prior art, anode piece of lithium ion secondary battery of the present invention can be on the premise of keeping high-energy-density, hence it is evident that improves containing high Ni lithium nickel cobalt oxides LiNixCoyM1-x-yO2The cycle performance of anode pole piece, it is also possible to improve its heat stability to a certain extent.
Accompanying drawing explanation
Below in conjunction with the accompanying drawings and detailed description of the invention, lithium rechargeable battery of the present invention, anode pole piece and beneficial effect thereof are described in detail.
Fig. 1 to Fig. 3 is respectively the circulation volume conservation rate comparison diagram of the lithium rechargeable battery obtained by different embodiments of the invention.
Detailed description of the invention
In order to make the goal of the invention of the present invention, technical scheme and Advantageous Effects become apparent from, below in conjunction with embodiment and accompanying drawing, the present invention is described in further detail.It is to be understood that embodiments of the invention are only used to explain the present invention, it is not intended to limit the present invention, and embodiments of the invention are not limited to the embodiment that provides in description.In following example, the condition routinely of unreceipted experiment condition makes, or presses the condition making that material supplier is recommended.
Embodiment 1 (comparative example)
Prepared by anode pole piece: the binding agent polyvinylidene fluoride (PVDF) first taking 3wt.% is dissolved in solvent N-methyl pyrilidone (NMP), fully dissolves until solution is clarified；By conductive carbon (supper-P) and high Ni ternary active material LiNi0.6Co0.2Mn0.2O2Adding in above-mentioned solution, be mixed into slurry, wherein the ratio of the solid masses of NCM, supper-P and PVDF is 94:3:3, and the solid content of pulp solution is 70%；Being coated on by slurry in the blank aluminum foil current collector (plus plate current-collecting body) of 16 μ m-thick, volatilize completely through oven cooking cycle solvent, positive and negative coating layer thickness is respectively 70 μm, then through pole piece roll-in, prepares anode pole piece, and compacted density is 3.4g/cm3, the pole piece thickness after compacting is 113 μm.
Prepared by cathode pole piece: by graphite, conductive agent supper-P, thickening agent carboxymethylcellulose sodium solution, bonding agent butadiene-styrene rubber and the uniform form slurry of pure water dispersed with stirring (wherein graphite: conductive agent: stabilizer: the mass ratio of bonding agent is 95.5:1.5:1.3:1.7), being coated on blank Copper Foil, toasted cold compaction obtains cathode pole piece.
Prepare lithium rechargeable battery: both positive and negative polarity pole piece and isolating membrane (using PE single-layer septum) are made battery core by winding method；Then battery core is loaded battery case, toasted removing solvent；It is then injected into electrolyte (1M LiPF6EC/EMC/DEC electrolyte, wherein the mass ratio of EC:EMC:DEC is 5:3:2)；Welded seal, then prepare lithium rechargeable battery through chemical conversion, aging technique.
Embodiment 2 (comparative example)
Preparing anode pole piece: remainder is identical with the step preparing anode pole piece in embodiment 1, be a difference in that the content of binding agent polyvinylidene fluoride (PVDF) is 1wt.%, employing is that Al replaces LiNixCoyM1-x-yO2In M, take LiNi0.8Co0.15Al0.05O2As active material；Because of LiNi0.8Co0.15Al0.05O2Capacity LiNi to be compared0.6Co0.2Mn0.2O2Height, for ensureing same battery capacity, so coating quality wants light, after its compacting, pole piece thickness is 107 μm.
Prepare cathode pole piece, prepare the step of lithium rechargeable battery all with embodiment 1.
Embodiment 3 (comparative example)
Prepare anode pole piece: remainder is identical with the step preparing anode pole piece in embodiment 1, be a difference in that the content of binding agent polyvinylidene fluoride (PVDF) is 3wt.%, use LiNi1/3Co1/3Mn1/3O2As active material；Because of LiNi1/3Co1/3Mn1/3O2Capacity LiNi to be compared0.5Co0.2Mn0.3O2Low, for ensureing same battery capacity, so coating quality to weigh a lot, after its compacting, pole piece thickness is 119 μm.
Prepare cathode pole piece, prepare the step of lithium rechargeable battery all with embodiment 1.
Embodiment 4
Prepare anode pole piece: remainder is identical with the step preparing anode pole piece in embodiment 1, be a difference in that the content of binding agent polyvinylidene fluoride (PVDF) is 2wt.%, when adding ternary active material, add blended anode material, LiNi0.6Co0.2Mn0.2O2With LiNi1/3Co1/3Mn1/3O2Mass ratio be 7:3；After mixing, gram volume is relative to LiNi0.6Co0.2Mn0.2O2Slightly decreasing, for ensureing same battery capacity, after its compacting, pole piece thickness is 115 μm.
Prepare cathode pole piece, prepare the step of lithium rechargeable battery all with embodiment 1.
Embodiment 5
Prepare anode pole piece: remainder is identical with the step preparing anode pole piece in embodiment 1, be a difference in that the content of binding agent polyvinylidene fluoride (PVDF) is 4wt.%, when adding ternary active material, add blended anode material, LiNi0.8Co0.15Al0.05O2With LiNi1/3Co1/3Mn1/3O2Quality be 7:3；After mixing, gram volume is compared embodiment 1 and is also had and slightly improve, and for ensureing same battery capacity, after its compacting, pole piece thickness is 111 μm.
Prepare cathode pole piece, prepare the step of lithium rechargeable battery all with embodiment 1.
Embodiment 6
Prepare anode pole piece: remainder with to prepare anode pole piece step in embodiment 4 identical, difference its be the content of binding agent polyvinylidene fluoride (PVDF) be 3.5wt.%, the ratio of blended anode material is LiNi0.6Co0.2Mn0.2O2With LiNi1/3Co1/3Mn1/3O2Quality be 5:5；After compacting, pole piece thickness is 116 μm.
Prepare cathode pole piece, prepare the step of lithium rechargeable battery all with embodiment 1.
Embodiment 7
Prepare anode pole piece: remainder with to prepare anode pole piece step in embodiment 4 identical, difference its be the content of binding agent polyvinylidene fluoride (PVDF) be 5.5wt.%, the ratio of blended anode material is LiNi0.6Co0.2Mn0.2O2With LiNi1/3Co1/3Mn1/3O2Quality be 9:1；After compacting, pole piece thickness is 114 μm.
Prepare cathode pole piece, prepare the step of lithium rechargeable battery all with embodiment 1.
Embodiment 8
Prepare anode pole piece: remainder with to prepare anode pole piece step in embodiment 5 identical, difference its be the content of binding agent polyvinylidene fluoride (PVDF) be 2wt.%, the ratio of blended anode material is LiNi0.8Co0.15Mn0.05O2With LiNi1/3Co1/3Mn1/3O2Quality be 5:5；After compacting, pole piece thickness is 113 μm.
Prepare cathode pole piece, prepare the step of lithium rechargeable battery all with embodiment 1.
Embodiment 9
Prepare anode pole piece: remainder with to prepare anode pole piece step in embodiment 5 identical, difference its be the content of binding agent polyvinylidene fluoride (PVDF) be 0.8wt.%, the ratio of blended anode material is LiNi0.8Co0.15Al0.05O2With LiNi1/3Co1/3Mn1/3O2Quality be 9:1；After compacting, pole piece thickness is 108 μm.
Prepare cathode pole piece, prepare the step of lithium rechargeable battery all with embodiment 1.
Embodiment 10 (comparative example)
The present invention specially compared for the technique effect mixed with lithium nickel cobalt dioxide, the preparation process of its anode pole piece is same as in Example 6, is a difference in that the content of binding agent polyvinylidene fluoride (PVDF) is 1wt.%, when adding ternary active material, add blended anode material, LiNi0.8Co0.2O2With LiNi1/3Co1/3Mn1/3O2Mass ratio be 5:5；After compacting, pole piece thickness is 114 μm.
Prepare cathode pole piece, prepare the step of lithium rechargeable battery all with embodiment 1
Embodiment 11 (comparative example)
Prepare anode pole piece: remainder is with to prepare anode pole piece step in embodiment 5 identical, and the content that content is 2wt.%, SP 1% of its binding agent polyvinylidene fluoride (PVDF) of difference, after compacting, pole piece thickness is 106 μm.
Prepare cathode pole piece, prepare the step of lithium rechargeable battery all with embodiment 1
Embodiment 12 (comparative example)
Prepare anode pole piece: remainder is with to prepare anode pole piece step in embodiment 5 identical, and the content that content is 2wt.%, SP 5% of its binding agent polyvinylidene fluoride (PVDF) of difference, after compacting, pole piece thickness is 108 μm.
Prepare cathode pole piece, prepare the step of lithium rechargeable battery all with embodiment 1
Embodiment 13 (comparative example)
Prepare anode pole piece: remainder is with to prepare anode pole piece step in embodiment 5 identical, and the content 5% of difference its binding agent PVDF, after compacting, pole piece thickness is 108 μm.
Prepare cathode pole piece, prepare the step of lithium rechargeable battery all with embodiment 1
Embodiment 14 (comparative example)
Prepare anode pole piece: remainder is with to prepare anode pole piece step in embodiment 5 identical, and the content 1.5% of difference its binding agent PVDF, the content 2.5% of SP, is 106 μm for pole piece thickness after compacting.
Prepare cathode pole piece, prepare the step of lithium rechargeable battery all with embodiment 1
Performance test
The lithium rechargeable battery preparing embodiment 1～14 carries out following performance test, and test result is listed in table 1:
1, positive electrode gram volume: when the potential range of 2.8-4.2V, uses PHEV electrokinetic cell normal capacity test condition 1C/1C to obtain reversible discharge capacity, and the gram volume calculating positive pole plays；
2, cycle performance contrast: 1C/1C circulation at 45 DEG C, voltage range is 2.8-4.2V, because the loop test cycle request of electrokinetic cell is the longest, so contrasting with capability retention when taking the 600th week；
3, level of security contrast: uses the most general US ABC abuse test standard scale to levy over-charging, wherein overcharges and is defined as 1C and crosses and be charged to 200%SOC, and the standard passed through is the most on fire not explode.Material Heat stability is good often inefficacy SOC relative delay or rearward, it might even be possible to pass through 200%SOC.
The battery performance test result of table 1, embodiment and comparative example
Ternary material LiNi1/3Co1/3Mn1/3O2In full battery, the gram volume of 1C/1C performance is at 143～145 mAh/g (2.8-4.2V), and LiFePO 4 material is applied on pure electric automobile more, calculates performance also only at 138-139mAh/g (2.5-3.65V) with 0.5C/0.5C.As it can be seen from table 1 the gram volume of all embodiments of the invention (not including comparative example) plays all far above LiFePO4, also exceed LiNi1/3Co1/3Mn1/3O2。
As can also be seen from Table 1:
1) embodiment 4-9 is compared and embodiment 1-2 (comparative example), and cycle performance has had and improves significantly, is contrasted the notable benefit that can be more clearly seen the present invention by Fig. 1 and Fig. 2.Fig. 1 is demonstrated by embodiment 4/6/7 and compares and embodiment 1 (LiNi0.6Co0.2Mn0.2O2) its cycle performance had and improved significantly, wherein embodiment 6 can from original 87% capability retention bring up to 92% conservation rate, even if embodiment 9 also makes moderate progress；
2) from the point of view of safety test, though the present invention can not pass through 200%SOC standard, but can significantly postpone the inefficacy SOC of high Ni ternary material, improve security reliability；
3) in embodiment 10 (comparative example) lithium nickel cobalt dioxide at the ternary material LiNi of mixed same ratio1/3Co1/3Mn1/3O2After, though cycle performance slightly increases, but improvement amplitude is less still can not meet requirement, because of the unstability of lithium nickel cobalt dioxide structure, it is difficult to meeting EV application, especially heat stability is excessively poor, almost without improvement, it is impossible to meet the application of EV battery.
4) comparative example 5 and embodiment 11-14, the most effectively collocation conductive carbon can effectively play presently embodied technique effect, wherein obvious excellent and other embodiments in circulation of embodiment 14 with the content of PVDF.
In sum, the present invention lithium nickel cobalt metal-oxide LiNi by high Ni contentxCoyM1-x-yO2With ternary material LiNi1/3Co1/3Mn1/3O2Mixed, while keeping high Ni lithium nickel cobalt metal-oxide energy density advantage, significantly improve the cycle performance of high Ni material, and improve the security reliability of high Ni ternary material anode pole piece to a certain extent, further promote the application in batteries of electric automobile field of the high Ni ternary material.
The announcement of book and teaching according to the above description, those skilled in the art in the invention can also carry out suitable change and amendment to above-mentioned embodiment.Therefore, the invention is not limited in detailed description of the invention disclosed and described above, should also be as some modifications and changes of the present invention falling in the scope of the claims of the present invention.Although additionally, employ some specific terms in this specification, but these terms are merely for convenience of description, the present invention is not constituted any restriction.
Claims (10)
1. an anode piece of lithium ion secondary battery, including plus plate current-collecting body and cover on plus plate current-collecting body
Active material layer, active material layer comprises positive electrode active materials；It is characterized in that: described positive-active
Material comprises LiNi1/3Co1/3Mn1/3O2Lithium nickel cobalt metal-oxide LiNi with high NixCoyM1-x-yO2,
Wherein, x>=0.5,0<Y<0.5.
Anode piece of lithium ion secondary battery the most according to claim 1, it is characterised in that: described height
The lithium nickel cobalt metal-oxide LiNi of NixCoyM1-x-yO2In, M is one at least in Mn or Al.
Anode piece of lithium ion secondary battery the most according to claim 2, it is characterised in that: described
LiNi1/3Co1/3Mn1/3O2Mass ratio in whole pole piece active material is 10～50%, the lithium nickel cobalt of high Ni
Metal-oxide LiNixCoyM1-x-yO2Mass ratio in pole piece active material is 50～90%.
Anode piece of lithium ion secondary battery the most according to claim 2, it is characterised in that: described
LiNi1/3Co1/3Mn1/3O2Mass ratio in whole pole piece active material is 20～35%, the lithium nickel cobalt of high Ni
Metal-oxide LiNixCoyM1-x-yO2Mass ratio in whole pole piece active material is 65～80%.
Anode piece of lithium ion secondary battery the most according to claim 1, it is characterised in that: described work
Property material layer also includes bonding agent polyvinylidene fluoride, polyvinylidene fluoride quality in active material layer
Content is 1～5%, preferably 2～3.5%.
Anode piece of lithium ion secondary battery the most according to claim 5, it is characterised in that: described work
Also including conductive agent SP in property material layer, conductive agent mass content in active material layer is 1～5%, excellent
Elect 2～3% as.
Anode piece of lithium ion secondary battery the most according to claim 1, it is characterised in that: described
LiNi1/3Co1/3Mn1/3O2Lithium nickel cobalt metal-oxide LiNi with high NixCoyM1-x-yO2It is present in positive pole pole
In identical active material layer in sheet, or it each is present in the different activities material layer of stacking.
Anode piece of lithium ion secondary battery the most according to claim 1, it is characterised in that: described just
Pole pole piece includes at least two-layer active material layer, wherein, with the surface active material layer of electrolyte contacts with
LiNi1/3Co1/3Mn1/3O2For positive electrode active materials, the active material layer below surface active material layer with
LiNixCoyM1-x-yO2For positive electrode active materials.
Anode piece of lithium ion secondary battery the most according to claim 1, it is characterised in that: described height
The lithium nickel cobalt metal-oxide LiNi of NixCoyM1-x-yO2Including one or more materials.
10. a lithium rechargeable battery, it includes anode pole piece, cathode pole piece, electrolyte and is interval in
Isolating membrane between both positive and negative polarity pole piece, it is characterised in that: described anode pole piece is to appoint in claim 1 to 9
Anticipate a described anode piece of lithium ion secondary battery.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510385699.2A CN106328925A (en) | 2015-06-30 | 2015-06-30 | Lithium ion secondary battery and positive pole piece thereof |
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| CN111492526A (en) * | 2018-11-29 | 2020-08-04 | 株式会社Lg化学 | Electrode assembly |
| CN111509232A (en) * | 2020-05-29 | 2020-08-07 | 蜂巢能源科技有限公司 | Positive plate and preparation method and application thereof |
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