CN103972507A - Negative pole active substance, negative pole piece, pulse buffer single battery containing negative pole piece, pulse buffer battery pack and power battery module - Google Patents

Negative pole active substance, negative pole piece, pulse buffer single battery containing negative pole piece, pulse buffer battery pack and power battery module Download PDF

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Publication number
CN103972507A
CN103972507A CN201310035918.5A CN201310035918A CN103972507A CN 103972507 A CN103972507 A CN 103972507A CN 201310035918 A CN201310035918 A CN 201310035918A CN 103972507 A CN103972507 A CN 103972507A
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pulse buffer
battery pack
negative
active material
electrode active
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CN103972507B (en
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屈丽辉
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BYD Co Ltd
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BYD Co Ltd
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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
    • H01M4/362—Composites
    • 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
    • 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
    • H01M10/058—Construction or manufacture
    • 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
    • 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
    • H01M4/362—Composites
    • H01M4/366—Composites as layered products
    • 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
    • H01M4/587—Carbonaceous material, e.g. graphite-intercalation compounds or CFx for inserting or intercalating light metals
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M2220/00—Batteries for particular applications
    • H01M2220/20—Batteries in motive systems, e.g. vehicle, ship, plane
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
    • Y02P70/50—Manufacturing or production processes characterised by the final manufactured product

Abstract

The invention provides a negative pole active substance. The cathode active substance contains graphite and an additive. The additive is at least one of nanoscale CoFe2O4, nanoscale Fe1.5Ti0.3O3, nanoscale Li2FeSiO4 and a Si/C nanoscale fiber compound. The invention also provides a negative pole piece, a pulse buffer single battery containing the negative pole piece, a pulse buffer battery pack and a power battery module. The power battery module has a high capacity retention ratio. The power battery module can be well protected by the pulse buffer battery pack.

Description

A kind of negative electrode active material, negative plate and the pulse buffer cell, battery pack and the power battery module that contain this negative plate
Technical field
The invention belongs to electrokinetic cell field, the pulse buffer battery, battery pack and the power battery module that relate in particular to a kind of negative electrode active material, negative plate and contain this negative plate.
Background technology
In recent years, along with the impact of oil crisis and the high-level requirement of environmental protection, hybrid vehicle, pure power vehicle have become the Main Trends of The Development of automobile.And as hybrid vehicle and pure electric automobile topmost power resources device---vehicle mounted dynamic battery module has become the focus of research.
The skidding mode of hybrid vehicle and pure electric automobile is different from traditional fuel vehicle, the mode of braking of fuel vehicle is mechanical brake, which brake wear is serious, and produce a large amount of heat and can cause heat fading phenomenon, and the skidding mode of hybrid vehicle and pure electric automobile is regenerative braking mode, its energy back that when brake is produced, to on-vehicle battery, had both been avoided the waste of energy, can improve again continual mileage.And hybrid vehicle and pure electric automobile continual mileage are very important.But energy back is short time pulse current while braking charges to power battery module.Existing vehicle mounted dynamic battery module is generally lithium ion power battery module, and this module is composed in series by some lithium ion single batteries.But the pulse current of brake generally more than 200A, duration 10S, so high electric current, battery module is produced to powerful impact, the damage of battery is also very serious, often occurs that electrolyte side reaction aggravation or negative pole produce Li dendrite, can have a strong impact on safety and the life-span of battery.
CN102263300 discloses a kind of vehicle mounted dynamic battery module.This vehicle mounted dynamic battery module comprises power battery pack, and power battery pack has some power cells to be composed in series; Also comprise the pulse buffer battery pack in parallel with power battery pack, pulse buffer battery pack is composed in series by some pulse buffer cells; The both end voltage of power battery pack equates with the both end voltage of pulse buffer battery pack, the both end voltage of power battery pack with the polarization resistance of pulse buffer battery pack than being 1:0.5-1:0.1.Vehicle mounted dynamic battery module of the present invention can effectively be resisted the injury that brake pulse current causes it; After pulse current impacts, can effectively keep cycle performance and the security performance of vehicle mounted dynamic battery module.But the technical scheme that this patent is mentioned is owing to limited by material and process conditions, and the 0.5-0.1 that the polarization resistance that can only accomplish pulse buffer battery pack is power battery pack doubly.This pulse buffer battery pack is limited to the protective capability of power battery pack.
Summary of the invention
The present invention is for solving electrokinetic cell in the time that high power discharges and recharges, large electric current produces the technical problem of powerful impact to battery module, provide a kind of and can carry out negative electrode active material, the negative plate of high power, high current charge-discharge and the pulse buffer battery that contains this negative plate, very power battery module of battery pack.
The invention provides a kind of negative electrode active material, this active material comprises graphite and additive; Described additive is nano Co Fe 2o 4, nanometer Fe 1.5ti 0.3o 3, nanometer Li 2feSiO 4with at least one in Si/C nanofiber composite.
The present invention also provides a kind of negative plate, and this negative plate comprises negative current collector and is coated on the negative material of negative pole currect collecting surface; Described negative material comprises negative electrode active material, conductive agent and binding agent; Described negative electrode active material is negative electrode active material of the present invention.
The present invention also provides a kind of pulse buffer cell, and described pulse buffer cell comprises cover plate, housing, battery core and electrolyte, and described battery core and electrolyte are sealed in battery container, and described cover plate is connected with housing seal; Described battery core comprise positive plate, negative plate and be arranged at positive plate and negative plate between barrier film; Wherein, described negative plate is negative plate of the present invention.
The present invention also provides a kind of pulse buffer battery pack, and described pulse buffer battery pack is that pulse buffer monocell of the present invention is in series.
The present invention also provides a kind of power battery module, and described module comprises power battery pack in parallel and pulse buffer battery pack; The both end voltage of described power battery pack equates with the both end voltage of pulse buffer battery pack; Described pulse buffer battery pack is pulse buffer battery pack of the present invention.
The pulse buffer battery pack that the present invention prepares is taken into account little impedance and small size, and the protective capability of power battery pack is significantly improved.
Embodiment
In order to make technical problem solved by the invention, technical scheme and beneficial effect clearer, below in conjunction with embodiment, the present invention is further elaborated.Should be appreciated that specific embodiment described herein, only in order to explain the present invention, is not intended to limit the present invention.
The invention provides a kind of negative electrode active material, this active material comprises graphite and additive; Described additive is nano Co Fe 2o 4, nanometer Fe 1.5ti 0.3o 3, nanometer Li 2feSiO 4with at least one in Si/C nanofiber composite.
In prior art, the particle of general negative active core-shell material graphite is all larger, just has gap between its particle and particle, contacts bad.Nano level CoFe 2o 4, Fe 1.5ti 0.3o 3, Li 2feSiO 4little with the particle of Si/C nanofiber composite, specific capacity is high, and conductivity is large, and power-performance is good.In general active material, add nano level CoFe 2o 4, Fe 1.5ti 0.3o 3, Li 2feSiO 4with Si/C nanofiber composite, can well fill the gap between active material graphite, path between active material is shortened and broaden, thereby improve the conductivity of negative plate.
Nano Co Fe of the present invention 2o 4can manufacture voluntarily, also can buy.As nano Co Fe 2o 4can adopt the mode of being prepared as follows to prepare: by Fe (NO 3) 39H 2o and Co (NO 3) 26H 2o(mol ratio 2:1) add in graphite, stirring at normal temperature 30min, adds NaOH to regulate pH value to make pH=10, stirs 30min.Then 180 DEG C of heating 20h, cooled and filtered, rinses, after being dried.
Nanometer Fe of the present invention 1.5ti 0.3o 3can manufacture voluntarily, also can buy.As nanometer Fe 1.5ti 0.3o 3can adopt the mode of being prepared as follows to prepare: Ti (OBu) 4add in alcohol, and then add HNO 3, obtain solution A.Fe (NO 3) 39H 2o joins in distilled water, obtains solution B.B is added in A, stir 30min, spent glycol amine is proofreaied and correct pH value and is made pH=3, places more than 7 days.Then 200 DEG C of heating, obtain solid product, by solid product distilled water cleaning, drying, fire 2h for 300 DEG C.
Nanometer Li of the present invention 2feSiO 4can manufacture voluntarily, also can buy.As nanometer Li 2feSiO 4can adopt the mode of being prepared as follows to prepare: by Fe (NO 3) 39H 2o adds in distilled water, then adds CH3COOLi2H 2o, adds citric acid and (C2H5O) 4Si again, and more than stirring at normal temperature 3h, then 80 degrees Celsius of evaporations, make it gel, by gel product 600 DEG C of calcining 10h of high temperature in inert atmosphere, obtains end product.
Si/C nanofiber composite of the present invention is to have silicon in the surface attachment of carbon.Its preparation method is: under hot conditions (more than 400 DEG C), silane gas is blended in inert gas, heats together with carbon, make the surface of siliceous deposits at carbon.Material with carbon element can use carbon nano-tube, also can use graphite, hard carbon or carbon black etc.
According to negative electrode active material provided by the present invention, preferably, in described negative electrode active material, the mass ratio of graphite and additive is 100:1-20.More preferably 100:8-12.Graphite is as negative active core-shell material, and its capacity is smaller with the decay of service time of battery, and still, particle is large, and conductivity is little, and specific capacity is low.And that the advantage of additive is particle is little, specific capacity is high, and conductivity is large, and power-performance is good, and shortcoming is that capacity is larger with the attenuation ratio of service time of battery.And graphite and additive within the scope of aforementioned proportion can bring into play its advantage and evade shortcoming, produce all reasonable batteries of power-performance and capacity.
According to negative electrode active material provided by the present invention, in order to reduce costs, preferably, the average grain diameter of described graphite is 1.5-12 micron.
According to negative electrode active material provided by the present invention, preferably, described nano Co Fe 2o 4, nanometer Fe 1.5ti 0.3o 3, nanometer Li 2feSiO 4the average grain diameter 50-200 nanometer of respectively doing for oneself; The diameter of described Si/C nanofiber composite is 50-200 nanometer.Length for Si/C nanofiber composite has no particular limits, if can fill with graphite hole in.This particle diameter is far smaller than the particle diameter of graphite, can well fill the hole of graphite.
The present invention also provides a kind of negative plate, and this negative plate comprises negative current collector and is coated on the negative material of negative pole currect collecting surface; Described negative material comprises negative electrode active material, cathode conductive agent and negative pole binding agent; Described negative electrode active material is negative electrode active material of the present invention.
According to negative plate provided by the present invention, preferably, the dressing thickness of described negative plate is 2-3 times of graphite average grain diameter.This thinner dressing thickness can shorten the distance that lithium ion moves, and accelerates the deintercalation of lithium ion, and the polarization while reducing large current density is applicable to high-power discharging and recharging.
According to negative plate provided by the present invention, preferably, the compacted density of described negative plate is 0.6-1.3g/cm 3.Compacted density within the scope of this both can ensure that electrokinetic cell had certain energy density, can ensure that pole piece has loose porous feature simultaneously, reduced the resistance of lithium ion infiltration, can high-powerly discharge and recharge.
In the present invention, can adopt and well known to a person skilled in the art various cathode conductive agent, preferably, described cathode conductive agent is at least one in carbon nano-tube, Graphene, carbon black.
In the present invention, can adopt and well known to a person skilled in the art various negative pole binding agents, preferably, described negative pole binding agent adopts the mixture of cellulose-based polymer and rubber latex, as the mixture of cellulose-based polymer and butadiene-styrene rubber.
In the present invention, can adopt and well known to a person skilled in the art various negative current collectors, for example, described negative current collector is stamped metal, metal forming, net metal or foamed metal.
The present invention also provides a kind of pulse buffer cell, and described pulse buffer cell comprises cover plate, housing, battery core and electrolyte, and described battery core and electrolyte are sealed in battery container, and described cover plate is connected with housing seal; Described battery core comprise positive plate, negative plate and be arranged at positive plate and negative plate between barrier film; Wherein, described negative plate is negative plate of the present invention.
Described positive plate comprises positive electrode active materials, plus plate current-collecting body, anodal conductive agent and binding agent.
The active material of described positive pole can adopt and well known to a person skilled in the art various active materials, and the present invention is not particularly limited.For example can be for thering are one or more mixing of the common lithium ion anode active material of LiFePO 4, lithium manganese phosphate, LiMn2O4, lithium cobalt oxygen, lithium nickel oxygen, binary or the ternary material etc. of feature of Large ratio surface, small particle diameter, high conductivity.
Anodal conductive agent of the present invention, anodal binding agent and plus plate current-collecting body are conventional various anodal conductive agent, anodal binding agent and plus plate current-collecting body of this area.For example: anodal conductive agent is carbon black; Anodal binding agent is Kynoar.Plus plate current-collecting body is aluminium foil; Positive plate dressing thickness, compacted density are determined according to the technique of concrete material and negative pole.
Described barrier film is the conventional various barrier films in this area, and the present invention is not particularly limited.It can be the conventional barrier film of the lithium ion battery such as polypropylene screen, polyethylene film or propylene and ethylene copolymer film.
Described electrolyte comprises lithium salts and solvent, and preferably conductivity is high, the electrolyte that temperature range is wide.Wherein, electrolyte lithium salt can be selected from lithium hexafluoro phosphate (LiPF 6), lithium perchlorate (LiClO 4), LiBF4 (LiBF 4), hexafluoroarsenate lithium (LiAsF 6), hexafluorosilicic acid lithium (LiSiF 6), tetraphenyl lithium borate (LiB (C 6h 5) 4), lithium chloride (LiCl), lithium bromide (LiBr), chlorine lithium aluminate (LiAlCl 4) and fluorocarbon based Sulfonic Lithium (LiC (SO 2cF 3) 3), LiCH 3sO 3, LiN (SO 2cF 3) 2in one or more.Electrolyte can be selected from chain acid esters and ring-type acid esters mixed solution, and wherein chain acid esters can be dimethyl carbonate (DMC), diethyl carbonate (DEC), methyl ethyl carbonate (EMC), methyl propyl carbonate (MPC), dipropyl carbonate (DPC) and other is fluorine-containing, sulfur-bearing or containing one or more in the chain organosilane ester of unsaturated bond.Ring-type acid esters can be ethylene carbonate (EC), propene carbonate (PC), vinylene carbonate (VC), gamma-butyrolacton (γ-BL), sultone and other is fluorine-containing, sulfur-bearing or containing one or more in the ring-type organosilane ester of unsaturated bond.In described electrolyte, the concentration of electrolyte lithium salt can be 0.1-2mol/L.
Described battery case can adopt the housing that well known to a person skilled in the art various materials, has no particular limits, as being the conventional battery case materials of lithium ion battery such as box hat, aluminum hull, plastics, aluminum plastic film.The structure of pole piece and preparation method all can adopt structure and the preparation method of this area routine.
The present invention also provides a kind of pulse buffer battery pack, and described pulse buffer battery pack is that pulse buffer monocell of the present invention is in series.
The present invention also provides a kind of power battery module, and described module comprises power battery pack in parallel and pulse buffer battery pack; The both end voltage of described power battery pack equates with the both end voltage of pulse buffer battery pack; Described pulse buffer battery pack is pulse buffer battery pack of the present invention.
Pulse buffer battery pack provided by the invention, the 0.5-0.05 that its polarization resistance is power battery pack doubly.
Applying specific embodiment is below described in further detail the present invention.
Comparative example 1
Power battery pack CC1 is by 100 electrokinetic cell monomer compositions, and the making parameter of each electrokinetic cell monomer is: positive electrode active materials is LiFePO 4, dressing thickness is 60 μ m, dressing area is 1.26m 2, dressing volume density is 2.2g/cm 3, negative active core-shell material is graphite, and dressing thickness is 50 μ m, and dressing area is 1.32m 2, dressing volume density is 1.1g/cm 3, the capacity of cell is 20Ah, and voltage is 3.2V, and internal resistance is 2m Ω, and inclusion internal resistance is 200m Ω.
Comparative example 2
Adopt the pulse buffer cell CA1 in patent CN102263300 embodiment 1, in parallel with CC1 after 133 CA1 series connection, form the fast CC2 of electrokinetic cell mould.
Embodiment 1-80
1, power battery pack: CC1;
2, pulse buffer cell A1-A80: positive electrode active materials, dressing thickness, dressing area, dressing volume density, negative active core-shell material, dressing thickness, dressing area, dressing volume density are in table 1;
3, pulse buffer battery pack B1-B80: be in series by multiple pulse buffer cell A1-A80 respectively.The internal resistance of the battery cell quantity of pulse buffer battery pack, the capacity of cell, voltage, internal resistance, pulse buffer battery pack is in table 2;
4, power battery module: by power battery pack CC1 respectively with pulse buffer battery pack B1-B80 formation in parallel power battery module C1-C80.
Table 1
Remarks: 1, anodal volume density: LiFePO 4: 2.2g/cm 3; LiCoO 2: 3.8g/cm 3; LiMn 2o 4: 2.8g/cm 3liMnPO 4: 1.9g/cm 3;
2, after graphite and additive, in bracket, be its average grain diameter, Si/C's is diameter, and unit is respectively micron and nanometer.
Table 2
Method of testing and result
1, the electrokinetic cell in the pulse buffer cell in embodiment, pulse buffer battery pack and comparative example is tested as follows, be the results are shown in Table 3.
Internal resistance of cell test: under room temperature, by cell with I 0.2Ccharging 2h, then with I 10Ccharging 1s, the voltage V while simultaneously measuring 10C charging end 3, after with 0.2C continue charging, after 10s, surveying cell voltage is V again 2, internal resistance computing formula is R=(V 3-V 2)/I 10C-I 0.2C.
Battery capacity test: under room temperature, by battery with 0.2C electric current constant current charge the charge cutoff voltage to various batteries, after with 0.2C electric current constant-current discharge the discharge cut-off voltage to various batteries, obtain the initial capacity of battery.
The voltage range of various batteries is: LiFePO 4: 2.0-3.6V; LiCoO 2: 2.5-4.2V; LiMn 2o 4: 2.5-4.4V; LiMnPO 4: 3-4.8V; LiMn 2o 4/ Li 4/3ti 5/3o 4: 1.8-3V.
Internal resistance ratio=pulse buffer internal resistance of single cell (A1-A80) * number of batteries/power battery pack internal resistance (CC1)
Capacity Ratio=pulse buffer cell capacity (A1-A80) * number of batteries/electrokinetic cell pool-size (CC1).
2, the fast CC2 of electrokinetic cell mould in the power battery pack CC1 in the power battery module C1-C80 in embodiment and comparative example 1 and comparative example 2 is tested as follows, the results are shown in Table 3.
Initial capacity test: at normal temperatures, 100A charges to 360V, shelves 10min, and 100A is discharged to 200V.Recording discharge capacity is C0
Pulse cycle test: at normal temperatures, 600A(or 6000A) charging 10s, 60A(or 200A) electric discharge 100s, so circulates 300,000 times.
Recover volume test: at normal temperatures, 100A charges to 360V, shelves 10min, and 100A is discharged to 200V.Recording discharge capacity is C1.
After 300000 circulations, capability retention calculates: C1/C0.
Table 3
As can be seen from Table 3, the electrokinetic cell module that adds buffer battery group of the present invention, after 600A circulation 300,000 times, capability retention is all higher than 69%, and the battery modules of comparative example 1 only has 40% at capability retention after 600A circulation 1,000,000 times, and comparative example 2 is 46%; The electrokinetic cell module that adds buffer battery group of the present invention, after 6000A circulation 300,000 times, capability retention is all higher than 10%, and the battery modules of comparative example 1 is 0 at capability retention after 6000A circulation 1,000,000 times, comparative example 2 is 0.Illustrate that pulse buffer battery pack of the present invention has good protective effect to electrokinetic cell module.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, all any amendments of doing within the spirit and principles in the present invention, be equal to and replace and improvement etc., within all should being included in protection scope of the present invention.

Claims (11)

1. a negative electrode active material, is characterized in that: this active material comprises graphite and additive; Described additive is nano Co Fe 2o 4, nanometer Fe 1.5ti 0.3o 3, nanometer Li 2feSiO 4with at least one in Si/C nanofiber composite.
2. negative electrode active material according to claim 1, is characterized in that: in described negative electrode active material, the mass ratio of graphite and additive is 100:1-20.
3. negative electrode active material according to claim 2, is characterized in that: in described negative electrode active material, the mass ratio of graphite and additive is 100:8-12.
4. negative electrode active material according to claim 1, is characterized in that: the average grain diameter of described graphite is 1.5-12 micron.
5. negative electrode active material according to claim 1, is characterized in that: described nano Co Fe 2o 4, nanometer Fe 1.5ti 0.3o 3, nanometer Li 2feSiO 4the average grain diameter 50-200 nanometer of respectively doing for oneself; The diameter of described Si/C nanofiber composite is 50-200 nanometer.
6. a negative plate, is characterized in that: this negative plate comprises negative current collector and is coated on the negative material of negative pole currect collecting surface; Described negative material comprises negative electrode active material, conductive agent and binding agent; Described negative electrode active material is the negative electrode active material described in claim 1-5 any one.
7. negative plate according to claim 6, is characterized in that: the dressing thickness of described negative plate is 2-3 times of graphite average grain diameter.
8. negative plate according to claim 6, is characterized in that: the compacted density of described negative plate is 0.6-1.3g/cm 3.
9. a pulse buffer cell, is characterized in that, described pulse buffer cell comprises cover plate, housing, battery core and electrolyte, and described battery core and electrolyte are sealed in battery container, and described cover plate is connected with housing seal; Described battery core comprise positive plate, negative plate and be arranged at positive plate and negative plate between barrier film; Wherein, described negative plate is the negative plate described in claim 6-8 any one.
10. a pulse buffer battery pack, is characterized in that, described pulse buffer battery pack is that pulse buffer monocell claimed in claim 9 is in series.
11. 1 kinds of power battery modules, is characterized in that, described module comprises power battery pack in parallel and pulse buffer battery pack; The both end voltage of described power battery pack equates with the both end voltage of pulse buffer battery pack; Described pulse buffer battery pack is pulse buffer battery pack claimed in claim 10.
CN201310035918.5A 2013-01-30 2013-01-30 A kind of negative electrode active material, negative plate and pulse buffer cell, battery pack and power battery module containing this negative plate Active CN103972507B (en)

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