CN102683743A - High-power lithium oil battery - Google Patents
High-power lithium oil battery Download PDFInfo
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- CN102683743A CN102683743A CN2012102155296A CN201210215529A CN102683743A CN 102683743 A CN102683743 A CN 102683743A CN 2012102155296 A CN2012102155296 A CN 2012102155296A CN 201210215529 A CN201210215529 A CN 201210215529A CN 102683743 A CN102683743 A CN 102683743A
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- positive electrode
- iron phosphate
- power lithium
- lithium ion
- high power
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- 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
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Abstract
The invention discloses a high-power lithium oil battery which comprises a positive electrode plate, a negative electrode plate, a membrane, an electrolyte and a shell, wherein the positive electrode plate comprises a current collector and a positive electrode material coated on the current collector. Two types of positive electrode materials of nano-level iron phosphate and micro-level iron phosphate are mixed according to a certain ratio, the defects of over low electric conductivity and low-temperature performance of the nano-level iron phosphate are remedied, thus the electric conductivity of a positive electrode active substance is improved, and the cost of the positive electrode material is lowered effectively. The high-power lithium oil battery manufactured by the invention has favorable high-current electricity discharge performance, and the battery can implement pulse electricity discharge of 75 C and continuous electricity discharge of 30C.
Description
Technical field
The present invention relates to a kind of high power lithium ion cell.
Background technology
Traditional emergency starting power supplys such as car and boat adopt lead acid accumulator more, and the reinforcement of Along with people's environmental consciousness in recent years becomes more and more thorny for the processing of employed lead of lead acid accumulator and sulfuric acid.Lithium battery is pollution-free, and the feature of environmental protection adopts lithium battery to replace lead-acid battery, as the battery in the emergency starting power supply, just becomes following trend of the times.
But lithium battery does not have high discharge-rate at present, and modal is exactly with interior (1C=1 hour rate rated capacity (A.H) at 30C; As: the battery 1C=8A of 8AH).Such as the battery of a joint 8AH, its maximum discharge current is exactly 30 * 8=240 ampere.This can not adapt to the oversize vehicle of great start-up current far away.And the cost of present lithium battery is higher, has also hindered the large-scale application of lithium battery.
Summary of the invention
A kind of high power lithium ion cell provided by the invention is a kind of high power lithium ion cell of cheap, good heavy current.
In order to achieve the above object, the present invention provides a kind of high power lithium ion cell, comprises positive plate, negative plate, barrier film, electrolyte and shell; Described positive plate comprises collector and is coated in the positive electrode on the collector; Described positive electrode comprises positive active material, adhesive and conductive agent; Described positive active material comprises nano-scale lithium iron phosphate and micron order LiFePO4.
The mass percent of said positive electrode is: positive active material 80 ~ 95%, adhesive 1 ~ 10%, conductive agent 1 ~ 10%.
Described nano-scale lithium iron phosphate and micron order LiFePO4 are olivine-type structure.
The weight ratio of described nano-scale lithium iron phosphate and micron order LiFePO4 is 1:7～1:9.
More excellent ground, the weight ratio of described nano-scale lithium iron phosphate and micron order LiFePO4 is 3:7～3:9.
Middle particle diameter D50 in the said nano-scale lithium iron phosphate is distributed as 300nm-900nm.
Middle particle diameter D50 in the said micron order LiFePO4 is distributed as 2um-10um.
The single face coated weight of said positive active material on collector is 80～140g/m
2
The present invention has following beneficial effect:
1, the present invention mixes two kinds of positive electrodes of nano-scale lithium iron phosphate and micron order LiFePO4 by a certain percentage; Nano-scale lithium iron phosphate conductivity and cryogenic property defective on the low side have been remedied; Thereby improved the conductance of positive active material, and effectively reduced the positive electrode cost.
2, the high power lithium ion cell of the present invention's making has good heavy-current discharge performance, and this battery can be realized the pulsed discharge of 75C and the continuous discharge of 30C.
Embodiment
Below specify preferred embodiment of the present invention.
A kind of high power lithium ion cell comprises positive plate, negative plate, barrier film, electrolyte and shell;
High power lithium ion cell provided by the invention can adopt conventional method preparation: in general; The positive plate for preparing, negative plate and barrier film be made into the mode of lamination or coiling do electric core; Adopt percussion welder that top cover negative pole lead and negative current collector Copper Foil are welded; Adopt supersonic welder that anodal lead of top cover and plus plate current-collecting body aluminium foil are welded; The electric core that will weld lead then is positioned in the battery container, with the battery container laser welded seal, can obtain high power lithium ion cell provided by the invention behind the notes electrolyte.
Described positive plate comprises collector and is coated in the positive electrode on the collector;
Described positive electrode comprises positive active material, adhesive and conductive agent;
The mass percent of said positive electrode is the conventional ratio in this area: positive active material 80 ~ 95%, adhesive 1 ~ 10%, conductive agent 1 ~ 10%;
Described positive active material comprises nano-scale lithium iron phosphate and micron order LiFePO4;
Described nano-scale lithium iron phosphate and micron order LiFePO4 are olivine-type structure; Both mix its architectural characteristic with arbitrary proportion and all remain unchanged; And both fill complementary through the mixing of varying particle size; It is low to remedy micron order LiFePO 4 material conductivity, the defective that multiplying power discharging property and low temperature performance are relatively poor, on the contrary the micron order LiFePO4 can remedy the defective of nano-scale lithium iron phosphate material and base material adhesion difference;
The weight ratio of described nano-scale lithium iron phosphate and micron order LiFePO4 is 1:7～1:9;
More excellent ground, the weight ratio of described nano-scale lithium iron phosphate and micron order LiFePO4 is 3:7～3:9;
Middle particle diameter D50 in the said nano-scale lithium iron phosphate is distributed as 300nm-900nm, and the middle particle diameter D50 in the micron order LiFePO4 is distributed as 2um-10um, to satisfy the requirement to big multiplying power discharging property;
The single face coated weight of said positive active material on collector is 80～140g/m
2Its purpose is; The diffusion of lithium ion in positive electrode is bigger to the influence of lithium ion battery heavy-current discharge performance; So reduce the coated weight of positive active material on collector, can effectively reduce the suffered resistance of lithium ion migration, improve the heavy-current discharge performance of battery simultaneously;
Described conductive agent can be the conventional anodal conductive agent in this area, for example one or more combinations in electrically conductive graphite, conductive black, acetylene black, the CNT;
Said adhesive can be polyolefin compound, for example polyvinylidene fluoride or polytetrafluoroethylene;
Said solvent can be one or more combinations in N-methyl pyrrolidone (NMP), dimethyl formamide (DMF) and the oxolane (THF);
Said collector is plus plate current-collecting body conventional in the lithium ion battery, for example aluminium foil or aluminium net; The present invention uses aluminium foil to be plus plate current-collecting body;
Described negative plate comprises collector, negative electrode active material, adhesive and conductive agent; Consisting of of said negative plate is conventionally known to one of skill in the art, and said negative plate can adopt the methods known in the art preparation, and negative electrode active material applies or is filled on the said collector, through oven dry and roll-in, promptly processes negative plate;
Described negative electrode active material can be the conventional negative material in this area, and for example one or more combinations in native graphite, Delanium, natural modified graphite, the MCMB are preferably MCMB;
Described negative pole adhesive can be fluorine resin and polyolefin compound, for example one or more combinations in butadiene-styrene rubber (SBR), sodium cellulose glycolate (CMC), acrylic copolymer, polyvinylidene fluoride (PVDF), the polytetrafluoroethylene (PTFE);
Described conductive agent can be the conventional cathode conductive agent in this area, for example one or more combinations in conductive carbon black, superconduction carbon black, acetylene black, the gas-phase grown nanometer charcoal fiber;
Described solvent can be in N-methyl pyrrolidone (NMP), deionized water, distilled water, absolute ethyl alcohol or the n-butanol one or more.
Described collector is negative current collector conventional in the lithium ion battery, for example Copper Foil or copper mesh; The present invention uses Copper Foil to be negative current collector;
Described barrier film places between positive plate and the negative plate; Barrier film can be nonwoven fabrics or synthetic resin microporous barrier; For example polyethene microporous membrane, microporous polypropylene membrane, polyethylene polypropylene composite micro porous film, the kind of said barrier film and performance are conventionally known to one of skill in the art.
Described electrolyte comprises electrolyte lithium salt and non-aqueous organic solvent; Electrolyte lithium salt can be lithium salts such as LiPF6, LiBF4, LiAsF6, LiClO4, LiBOB; Organic solvent can be selected chain acid esters and ring-type acid esters mixed solution for use; Wherein the chain acid esters can be one or more combinations in dimethyl carbonate (DMC), diethyl carbonate (DEC), the methyl ethyl carbonate (EMC), and the ring-type acid esters can be one or more combinations in ethylene carbonate (EC), vinylene carbonate (VC), the propene carbonate (PC).
Although content of the present invention has been done detailed introduction through above-mentioned preferred embodiment, will be appreciated that above-mentioned description should not be considered to limitation of the present invention.After those skilled in the art have read foregoing, for multiple modification of the present invention with to substitute all will be conspicuous.Therefore, protection scope of the present invention should be limited appended claim.
Claims (8)
1. a high power lithium ion cell comprises positive plate, negative plate, barrier film, electrolyte and shell; Described positive plate comprises collector and is coated in the positive electrode on the collector; Described positive electrode comprises positive active material, adhesive and conductive agent; It is characterized in that described positive active material comprises nano-scale lithium iron phosphate and micron order LiFePO4.
2. high power lithium ion cell as claimed in claim 1 is characterized in that, the mass percent of said positive electrode is: positive active material 80 ~ 95%, adhesive 1 ~ 10%, conductive agent 1 ~ 10%.
3. high power lithium ion cell as claimed in claim 1 is characterized in that, described nano-scale lithium iron phosphate and micron order LiFePO4 are olivine-type structure.
4. high power lithium ion cell as claimed in claim 1 is characterized in that, the weight ratio of described nano-scale lithium iron phosphate and micron order LiFePO4 is 1:7～1:9.
5. high power lithium ion cell as claimed in claim 4 is characterized in that, more excellent ground, and the weight ratio of described nano-scale lithium iron phosphate and micron order LiFePO4 is 3:7～3:9.
6. high power lithium ion cell as claimed in claim 1 is characterized in that, the middle particle diameter D50 in the said nano-scale lithium iron phosphate is distributed as 300nm-900nm.
7. high power lithium ion cell as claimed in claim 1 is characterized in that, the middle particle diameter D50 in the said micron order LiFePO4 is distributed as 2um-10um.
8. high power lithium ion cell as claimed in claim 1 is characterized in that, the single face coated weight of said positive active material on collector is 80～140g/m
2
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012102155296A CN102683743A (en) | 2012-06-28 | 2012-06-28 | High-power lithium oil battery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012102155296A CN102683743A (en) | 2012-06-28 | 2012-06-28 | High-power lithium oil battery |
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| CN102683743A true CN102683743A (en) | 2012-09-19 |
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| CN2012102155296A Pending CN102683743A (en) | 2012-06-28 | 2012-06-28 | High-power lithium oil battery |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104201384A (en) * | 2014-04-19 | 2014-12-10 | 东风商用车有限公司 | Lithium ion battery negative pole piece and manufacturing method thereof |
| CN104282933A (en) * | 2013-07-05 | 2015-01-14 | 福建博瑞特电机有限公司 | Low temperature lithium iron phosphate power battery and preparation method thereof |
| CN106469806A (en) * | 2015-08-17 | 2017-03-01 | 惠州市豪鹏科技有限公司 | A kind of positive electrode active materials and preparation method thereof, positive plate and lithium ion battery |
| CN106469813A (en) * | 2015-08-17 | 2017-03-01 | 惠州市豪鹏科技有限公司 | A kind of positive electrode active materials and preparation method thereof, positive plate and lithium ion battery |
| CN113036085A (en) * | 2021-03-26 | 2021-06-25 | 湖北亿纬动力有限公司 | Positive pole piece and preparation method and application thereof |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003257416A (en) * | 2002-03-04 | 2003-09-12 | Mitsubishi Cable Ind Ltd | Positive electrode for lithium ion secondary battery and lithium ion secondary battery using this positive electrode |
| CN102237525A (en) * | 2010-04-29 | 2011-11-09 | 上海比亚迪有限公司 | Anode material and preparation method thereof |
-
2012
- 2012-06-28 CN CN2012102155296A patent/CN102683743A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003257416A (en) * | 2002-03-04 | 2003-09-12 | Mitsubishi Cable Ind Ltd | Positive electrode for lithium ion secondary battery and lithium ion secondary battery using this positive electrode |
| CN102237525A (en) * | 2010-04-29 | 2011-11-09 | 上海比亚迪有限公司 | Anode material and preparation method thereof |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104282933A (en) * | 2013-07-05 | 2015-01-14 | 福建博瑞特电机有限公司 | Low temperature lithium iron phosphate power battery and preparation method thereof |
| CN104282933B (en) * | 2013-07-05 | 2016-06-22 | 福建博瑞特电机有限公司 | A kind of low-temperature lithium iron phosphate power and preparation method thereof |
| CN104201384A (en) * | 2014-04-19 | 2014-12-10 | 东风商用车有限公司 | Lithium ion battery negative pole piece and manufacturing method thereof |
| CN106469806A (en) * | 2015-08-17 | 2017-03-01 | 惠州市豪鹏科技有限公司 | A kind of positive electrode active materials and preparation method thereof, positive plate and lithium ion battery |
| CN106469813A (en) * | 2015-08-17 | 2017-03-01 | 惠州市豪鹏科技有限公司 | A kind of positive electrode active materials and preparation method thereof, positive plate and lithium ion battery |
| CN113036085A (en) * | 2021-03-26 | 2021-06-25 | 湖北亿纬动力有限公司 | Positive pole piece and preparation method and application thereof |
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Application publication date: 20120919 |