WO2021115316A1 - 一种LiPF6生产工艺和生产系统,及含LiPF6的混合物晶体、组合物、电解液、锂电池 - Google Patents
一种LiPF6生产工艺和生产系统,及含LiPF6的混合物晶体、组合物、电解液、锂电池 Download PDFInfo
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- WO2021115316A1 WO2021115316A1 PCT/CN2020/134848 CN2020134848W WO2021115316A1 WO 2021115316 A1 WO2021115316 A1 WO 2021115316A1 CN 2020134848 W CN2020134848 W CN 2020134848W WO 2021115316 A1 WO2021115316 A1 WO 2021115316A1
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- WO
- WIPO (PCT)
- Prior art keywords
- microchannel reactor
- crystal
- lithium hexafluorophosphate
- lithium
- gas
- Prior art date
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- 239000013078 crystal Substances 0.000 title claims abstract description 282
- 239000000203 mixture Substances 0.000 title claims abstract description 114
- 229910052744 lithium Inorganic materials 0.000 title claims description 41
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 title claims description 40
- 238000000034 method Methods 0.000 title abstract description 52
- 230000008569 process Effects 0.000 title abstract description 20
- 239000008151 electrolyte solution Substances 0.000 title abstract description 4
- 239000007788 liquid Substances 0.000 claims abstract description 187
- 239000002245 particle Substances 0.000 claims abstract description 109
- 238000002425 crystallisation Methods 0.000 claims abstract description 56
- 230000008025 crystallization Effects 0.000 claims abstract description 55
- 238000001035 drying Methods 0.000 claims abstract description 44
- 238000002360 preparation method Methods 0.000 claims abstract description 44
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 claims abstract description 16
- 229910001416 lithium ion Inorganic materials 0.000 claims abstract description 16
- 229910001290 LiPF6 Inorganic materials 0.000 claims abstract 12
- PQXKHYXIUOZZFA-UHFFFAOYSA-M lithium fluoride Chemical compound [Li+].[F-] PQXKHYXIUOZZFA-UHFFFAOYSA-M 0.000 claims description 329
- -1 lithium hexafluorophosphate Chemical compound 0.000 claims description 266
- 238000006243 chemical reaction Methods 0.000 claims description 137
- 239000003792 electrolyte Substances 0.000 claims description 109
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical group Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 claims description 73
- OBCUTHMOOONNBS-UHFFFAOYSA-N phosphorus pentafluoride Chemical compound FP(F)(F)(F)F OBCUTHMOOONNBS-UHFFFAOYSA-N 0.000 claims description 69
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 claims description 62
- 229910052731 fluorine Inorganic materials 0.000 claims description 62
- 239000011737 fluorine Substances 0.000 claims description 62
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- 238000003786 synthesis reaction Methods 0.000 claims description 50
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- 239000002253 acid Substances 0.000 claims description 26
- JBTWLSYIZRCDFO-UHFFFAOYSA-N ethyl methyl carbonate Chemical compound CCOC(=O)OC JBTWLSYIZRCDFO-UHFFFAOYSA-N 0.000 claims description 24
- 239000000654 additive Substances 0.000 claims description 23
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 21
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- QSZMZKBZAYQGRS-UHFFFAOYSA-N lithium;bis(trifluoromethylsulfonyl)azanide Chemical compound [Li+].FC(F)(F)S(=O)(=O)[N-]S(=O)(=O)C(F)(F)F QSZMZKBZAYQGRS-UHFFFAOYSA-N 0.000 claims description 12
- IGILRSKEFZLPKG-UHFFFAOYSA-M lithium;difluorophosphinate Chemical compound [Li+].[O-]P(F)(F)=O IGILRSKEFZLPKG-UHFFFAOYSA-M 0.000 claims description 12
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- 230000000996 additive effect Effects 0.000 claims description 10
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- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 claims description 8
- 238000009826 distribution Methods 0.000 claims description 8
- 239000012535 impurity Substances 0.000 claims description 7
- 229910003002 lithium salt Inorganic materials 0.000 claims description 7
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- SBLRHMKNNHXPHG-UHFFFAOYSA-N 4-fluoro-1,3-dioxolan-2-one Chemical compound FC1COC(=O)O1 SBLRHMKNNHXPHG-UHFFFAOYSA-N 0.000 claims description 6
- 229910013872 LiPF Inorganic materials 0.000 claims description 6
- 101150058243 Lipf gene Proteins 0.000 claims description 6
- GKZFQPGIDVGTLZ-UHFFFAOYSA-N 4-(trifluoromethyl)-1,3-dioxolan-2-one Chemical compound FC(F)(F)C1COC(=O)O1 GKZFQPGIDVGTLZ-UHFFFAOYSA-N 0.000 claims description 5
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- VDVLPSWVDYJFRW-UHFFFAOYSA-N lithium;bis(fluorosulfonyl)azanide Chemical compound [Li+].FS(=O)(=O)[N-]S(F)(=O)=O VDVLPSWVDYJFRW-UHFFFAOYSA-N 0.000 claims description 2
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 claims 1
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- 230000007704 transition Effects 0.000 description 1
- 229910052723 transition metal Inorganic materials 0.000 description 1
- 229910000314 transition metal oxide Inorganic materials 0.000 description 1
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- H01M2300/00—Electrolytes
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- H01M2300/0025—Organic electrolyte
- H01M2300/0028—Organic electrolyte characterised by the solvent
- H01M2300/0037—Mixture of solvents
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- H—ELECTRICITY
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- H01M2300/0017—Non-aqueous electrolytes
- H01M2300/0048—Molten electrolytes used at high temperature
- H01M2300/0051—Carbonates
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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
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- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
Definitions
- the present invention relates to the technical field of new energy, in particular to the field of lithium ion battery electrolyte, in particular to the production method, equipment, continuous production system, manufactured products and uses of lithium hexafluorophosphate.
- the first feed stream containing PF5 in the present invention is generated from the PF5 generator and directly passed into the first microchannel reactor without a separation process in the middle, which is a continuous reaction.
- the first feed stream containing PF5 also includes HCl, which is a mass transfer promoting component.
- HCl does not participate in the reaction, and serves as a mass transfer promoting component to improve the mass transfer effect between the reactants, so that PF5 and LiF are fully and uniformly reacted, and the LiF reaction is complete.
- the gas part in the product of the first microchannel reactor includes HCl and unreacted PF5.
- the second microchannel reactor (6) contains at least two feed streams: One is the gas separated by the gas-liquid separator A (4), which contains unreacted PF5 and entrained HF and HCl components, and the other is the HF solution in which LiF and LiPF6 are dissolved. PF5 and LiF react to form lithium hexafluorophosphate. It can be seen that the two sets of microchannel reactors used in the present invention are not simply connected in series, and the effect is not a simple superposition of the two sets of microchannel reactors, but combines the chemical reaction performance of the raw materials and products to adjust the second microchannel reactor (6 ) Input raw material flow, thereby achieving the purpose of controlling side reactions, improving raw material utilization, and improving product purity.
- the output material of the micro first channel reactor (3) enters the gas-liquid separator A (4), and the liquid mixture separated by the gas-liquid separator A (4) sequentially enters the synthesis liquid tank (5) and crystallization
- the tank (9) carries out the crystallization of lithium hexafluorophosphate, and the mother liquor after crystallization and filtration is stored in the mother liquor tank (11). After the mother liquor in the mother liquor tank (11) is quantitatively analyzed to determine the lithium hexafluorophosphate content, it is sent to the LiF dissolution tank (12) for quantitative LiF dissolving solution preparation.
- the lithium hexafluorophosphate produced by the present invention can have a variety of application fields, and optionally can be used as an electrolyte component of a lithium ion battery as described above.
- the moisture content in the composition of the present invention is preferably less than 7 ppm, and more preferably less than 6 ppm, 5 ppm, 4 ppm, 3 ppm, 2 ppm, and 1 ppm.
- the LiPF6 crystal content in the composition of the present invention is as high as 99.99% or more (wt).
- the crystal particles are uniform in size and moderate in size.
- the product of the invention has high stability, high consistency, high purity and low moisture content, and the lithium ion battery prepared as an electrolyte component has excellent performance.
- the moisture content of the anhydrous hydrogen fluoride after the foaming treatment of the present invention is less than 10 ppm, preferably less than 8 ppm, and more preferably less than 5 ppm, 2 ppm, or 1 ppm.
- a heat treatment process is performed after drying: the dried product is supplied to a heating furnace, and by performing heat treatment here, a composition including lithium hexafluorophosphate crystal particles of higher purity can be obtained.
- the interior of the heating furnace is evacuated and then sealed with phosphorus pentafluoride gas, the heating time is 1 to 3 hours, the temperature is 85 to 100° C., the pressure is atmospheric pressure, and the furnace is cooled to room temperature.
- the interior of the container is evacuated to obtain the composition.
- the crystal plane group ⁇ 110 ⁇ accounts for 40-60%
- the crystal plane group ⁇ 111 ⁇ accounts for 40-60%.
- the mass percentage of lithium hexafluorophosphate in the mixed crystals is 99.90-99.995%, preferably 99.95-99.995%. Further preferably, the mass percentage of lithium hexafluorophosphate in the mixture crystal is 99.99-99.995%.
- lithium hexafluorophosphate mixture crystal of the present invention as the electrolyte, and the interaction with the additives lithium difluorophosphate, lithium bistrifluoromethanesulfonimide, and fluorocarbonate can improve the high temperature cycle of non-aqueous electrolyte and secondary lithium battery Performance, high temperature storage performance and low temperature output performance.
- the various components in the fluorine-containing electrolyte act synergistically, so that the fluorine-containing electrolyte has the advantages of high stability, good durability, and good battery cycle performance.
- the fluorine-containing electrolyte of the invention has low water content, high safety and high stability.
- the gas-liquid mixture from the first microchannel reactor enters the first gas-liquid separator, the liquid in the first gas-liquid separator is transported to the synthetic liquid tank for storage, and the gas separated by the first gas-liquid separator contains The unreacted phosphorus pentafluoride, hydrogen chloride and entrained hydrogen fluoride, this mixed gas is transported to the second microchannel reactor and reacted with the third feed stream containing LiPF6, LiF and HF.
- the reaction temperature of the second microchannel reactor is 3°C, and the residence time is 5 seconds.
- the gas-liquid mixture in the second microchannel reactor enters the second gas-liquid separator.
- the gas separated by the second gas-liquid separator contains hydrogen chloride and entrained hydrogen fluoride.
- the non-aqueous electrolyte was prepared according to the steps and conditions of Example 5.1. The difference is that the length-to-diameter ratio of the lithium hexafluorophosphate mixture crystal is 0.6-0.9, the average particle size is 0.11mm, and 55% (wt) of the crystal particles have crystal faces.
- the conductivity of the fluorine-containing electrolyte at 25°C is 10.85mS/cm. (Assemble the LiCoO2/graphite full battery, test the capacity retention rate after 500 weeks of cycling at a rate of 0.5C at a cut-off voltage of 3.0V to 4.4V at 25°C, which is 92.8%.
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Abstract
Description
Claims (52)
- 一种六氟磷酸锂生产工艺,其特征在于:将包含PF5的第一进料流和包含LiF和HF的第二进料流通入第一微通道反应器,第一微通道反应器产物中的气体部分通入第二微通道反应器,与包含LiPF6、LiF和HF的第三进料流进行反应,第一微通道反应器产物中的液体部分经过结晶、干燥后得到六氟磷酸锂。
- 根据权利要求1所述的生产工艺,其特征在于:第二微通道反应器产物中的液体部分可以作为第四进料流加入至第一微通道反应器。
- 根据权利要求1所述的生产工艺,其特征在于:第一进料流中还包括传质促进组分。
- 根据权利要求1所述的生产工艺,其特征在于:第一进料流中的传质促进组分为HCl。
- 根据权利要求1所述的生产工艺,其特征在于:第一进料流中还包括HF。
- 根据权利要求1所述的生产工艺,其特征在于:第一微通道反应器和第二微通道反应器的反应温度控制在0~17℃。
- 根据权利要求1所述的生产工艺,其特征在于:第一微通道反应器和第二微通道反应器的停留时间为5~120秒。
- 根据权利要求1所述的生产工艺,其特征在于:第一微通道反应器产物中的液体部分在进入结晶槽结晶之前先进入合成液槽储存。
- 一种权利要求1~8任一项所述的生产工艺制备得到的六氟磷酸锂晶体,其特征在于:六氟磷酸锂晶体纯度高达99.99wt%以上,晶体颗粒粒径均匀,80wt%以上的晶体颗粒粒径为0.2~0.3mm,90wt%以上的晶体颗粒粒径为0.18~0.35mm。
- 一种六氟磷酸锂的连续生产系统,其特征在于:该连续生产系统包含五氟化磷发生器(2)、第一微通道反应器(3)、气液分离器A(4)、第二微通道反应器(6)、气液分离器B(7),以含有PF5的气体和溶有LiF的HF溶液为原料进行逆循环反应,所述五氟化磷发生器(2)生成的气体通入到第一微通道反应器(3)中,第一微通道反应器(3)的输出物料进入气液分离器A(4),气液分离器A(4)分离出来的气体进入第二微通道反应器(6)作为反应原料继续反应,第二微通道反应器(6)的输出物料进入气液分离器 B(7),气液分离器B(7)分离出来的液体组分,输送到第一微通道反应器(3)中。
- 根据权利要求10所述的六氟磷酸锂的连续生产系统,所述逆循环反应包含如下特征:五氟化磷发生器(2)中生成的混合气体PF5、HCl以及夹带的HF气体通入到第一微通道反应器(3)中,同时第一微通道反应器(3)中用泵输送溶有LiF的HF溶液,PF5和HF溶液中的LiF在第一微通道反应器(3)发生反应。
- 根据权利要求10所述的六氟磷酸锂的连续生产系统,其特征在于:所述第二微通道反应器(6)至少包含两股进料流:一股为气液分离器A(4)分离的气体即含有未反应完的PF5以及夹带的HF、HCl的组分,另一股为溶有LiF和LiPF6的HF溶液。
- 根据权利要求12所述的六氟磷酸锂的连续生产系统,其特征在于:控制所述第二微通道反应器(6)中反应原料PF5和LiF的摩尔比为1:1~2。
- 根据权利要求11所述的六氟磷酸锂的连续生产系统,所述逆循环反应进一步包含如下特征:气液分离器B(7)分离出来的液体组分含有LiPF6以及未反应完全的LiF。
- 根据权利要求11所述的六氟磷酸锂的连续生产系统,所述逆循环反应进一步包含如下特征:第一微通道反应器(3)的输出物料进入气液分离器A(4),气液分离器A(4)分离出来的液体混合物料,依次进入到合成液槽(5)和结晶槽(9)进行六氟磷酸锂的结晶,结晶过滤后的含有LiPF6的HF溶液输送到第二微通道反应器(6)作为第三股进料流。
- 根据权利要求11所述的六氟磷酸锂的连续生产系统,所述逆循环反应进一步包含如下特征:将气液分离器B(7)中分离的气体通过增压设备输送到HF、HCl分离系统(8),分离系统(8)顶部的HCl经水吸收成工业盐酸,底部的HF可以作为反应原料循环使用。
- 根据权利要求15所述的六氟磷酸锂的连续生产系统,其特征在于:结晶槽(9)在冷却状态下进行六氟磷酸锂的结晶,结晶过滤后去干燥系统(10)进行干燥除酸,得到六氟磷酸锂产品。
- 一种用权利要求10所述的六氟磷酸锂的连续生产系统制备得到的六氟磷酸锂产品,其特征在于:产品纯度99.98%以上。
- 根据权利要求18所述的六氟磷酸锂产品,其特征在于:包含的杂质种类以及含量如下:水分≤20ppm,游离酸(以HF计)≤90ppm,不溶物≤200ppm,硫酸盐(以SO 4 计)≤5ppm,氯化物(以Cl计)≤2ppm,其他各种金属离子≤1ppm。
- 一种含有六氟磷酸锂的混合物晶体,其特征在于:含有六氟磷酸锂的混合物晶体的长径比为1~1.5,晶体的平均粒径为0.15~0.4mm,90%以上的所述晶体中,晶面族{110}占20~80%、晶面族{111}占20~80%,所述混合物晶体还包含不溶物、游离酸。
- 根据权利要求20所述的晶体,其特征在于:68%以上的所述晶体粒径为0.2~0.3mm,80%以上的所述晶体粒径为0.18~0.35mm。
- 根据权利要求20或21所述的晶体,其特征在于:80%以上的所述晶体中,晶面族{110}占40~60%、晶面族{111}占40~60%。
- 根据权利要求20或21所述的晶体,其特征在于:所述晶体的休止角为20~40°。
- 根据权利要求20或21所述的晶体,其特征在于:所述晶体的堆积密度1.3~1.8g/mL。
- 根据权利要求20或21所述的晶体,其特征在于:所述晶体中六氟磷酸锂的质量百分含量为99.90~99.995%。
- 根据权利要求20或21所述的晶体,其特征在于:所述晶体的制备方法包括:以包含PF5的物流和包含LiF和HF的物流为原料,在第一微通道反应器和第二微通道反应器连续逆循环反应。
- 根据权利要求26所述的晶体,其特征在于:所述的第一微通道反应器和第二微通道反应器的反应温度为0~17℃,在反应器中的停留时间为5~120s。
- 根据权利要求27所述的晶体,其特征在于:所述第一微通道反应器中五氟化磷与氟化锂的摩尔比为2~5:1,第二微通道反应器中五氟化磷与氟化锂的摩尔比为1:1~2。
- 一种组合物,其特征在于:包括LiPF6晶体和水分,LiPF6晶体粒径分布均匀,35~50%的晶体粒径大于等于0.2mm、小于0.25mm,35~50%的晶体粒径大于等于0.25mm、小于等于0.3mm,组合物水分含量低于8ppm。
- 根据权利要求29所述的组合物,其特征在于:40-50%的晶体粒径大于等于0.2mm、小于0.25mm,40~50%的晶体粒径大于等于0.25mm、小于等于0.3mm。
- 根据权利要求29所述的组合物,其特征在于:所述组合物的制备利用了微通道反应器,微通道反应器为两个,其制备工艺中,第一微通道反应器产物中的气体部分进入 第二微通道反应器,第二微通道反应器产物中的液体部分进入第一微通道反应器。
- 根据权利要求31所述的组合物,其特征在于:其制备工艺中,进入第一微通道反应器的进料流为包含PF5的第一进料流、包含LiF和HF的第二进料流和第二微通道反应器产物中的液体部分的第四进料流,进入第二微通道反应器的进料流为第一微通道反应器产物中的气体部分和包含LiPF6、LiF和HF的第三进料流。
- 根据权利要求32所述的组合物,其特征在于:其制备工艺中,包含PF5的第一进料流自PF5发生器生成后直接通入第一微通道反应器,中间无需经过分离过程。
- 一种非水电解液,包括锂盐、有机溶剂,其特征在于:所述锂盐为含有六氟磷酸锂的混合物晶体,所述混合物晶体的长径比为1~1.5,晶体的平均粒径为0.15~0.4mm,90%以上的所述晶体中,晶面族{110}占20~80%、晶面族{111}占20~80%,所述混合物晶体还包含不溶物、游离酸,混合物晶体中六氟磷酸锂的质量百分含量为99.90~99.995%。
- 根据权利要求34所述的非水电解液,其特征在于:非水电解液中六氟磷酸锂的浓度为0.6~2mol/L。
- 根据权利要求34或35所述的非水电解液,其特征在于:所述非水电解液还包括添加剂,所述添加剂包括二氟磷酸锂、双三氟甲基磺酰亚胺锂及氟代碳酸酯中的至少二种。
- 根据权利要求36所述的非水电解液,其特征在于:相对于100%重量的电解液,所述添加剂的添加量为0.01~5%。
- 根据权利要求36所述的非水电解液,其特征在于:相对于100%重量的电解液,所述二氟磷酸锂、双三氟甲基磺酰亚胺锂与氟代碳酸酯的重量比为1:0.5~1.5:2.5~3.5。
- 根据权利要求36所述的非水电解液,其特征在于:所述氟代碳酸酯包括氟代碳酸乙烯酯和/或三氟代碳酸丙烯酯。
- 根据权利要求39所述的非水电解液,其特征在于:所述氟代碳酸乙烯酯与三氟代碳酸丙烯酯的重量比为1:1~6。
- 根据权利要求34或35所述的非水电解液,其特征在于:所述有机溶剂包括环状碳酸酯和/或链状碳酸酯的非水溶剂。
- 根据权利要求41所述的非水电解液,其特征在于:所述环状碳酸酯和链状碳酸 酯的体积比为1:1~9。
- 一种二次锂电池,其特征在于:使用权利要求34或35所述的非水电解液。
- 一种高稳定性含氟电解液,其特征在于:包括六氟磷酸锂,配制含氟电解液时使用的六氟磷酸锂为68%以上粒径大于等于0.2mm、小于等于0.3mm的六氟磷酸锂,六氟磷酸锂的水分含量低于6ppm,六氟磷酸锂的纯度为99.99%以上,含氟电解液中,六氟磷酸锂的质量百分含量为5~20wt%。
- 根据权利要求44所述的含氟电解液,其特征在于:配制含氟电解液时使用的六氟磷酸锂晶体粒径分布均匀,30~50%的晶体粒径大于等于0.2mm、小于0.25mm,30~50%的晶体粒径大于等于0.25mm、小于等于0.3mm。
- 根据权利要求45所述的含氟电解液,其特征在于:配制含氟电解液时使用的六氟磷酸锂晶体粒径分布均匀,40~50%的晶体粒径大于等于0.2mm、小于0.25mm,40~50%的晶体粒径大于等于0.25mm、小于等于0.3mm。
- 根据权利要求44所述的含氟电解液,其特征在于:含氟电解液中还包括LiPO 2F 2、LiBF 2C 2O 4、LiBF 4、LiPF 6、LiFSI、LiTFSI、LiAsF 6、LiClO 4、LiSO3CF 3、LiC 2O 4BC 2O 4、LiF 2BC 2O 4、LiPO 2F 2、LiPF 2、LiPF 4C 2O 4和LiPF 2C 4O 8中的至少一种,在含氟电解液中的质量百分含量为0.1~5wt%。
- 根据权利要求47所述的含氟电解液,其特征在于:含氟电解液中包括LiPO 2F 2和LiBF 2C 2O 4。
- 根据权利要求47或48所述的含氟电解液,其特征在于:含氟电解液中还包括1,2-双(三氟甲基)苯,1,2-双(三氟甲基)苯在含氟电解液中的质量百分含量为0.1~3wt%。
- 根据权利要求44所述的含氟电解液,其特征在于:含氟电解液中包括碳酸乙烯酯、碳酸甲乙酯和碳酸二乙酯,碳酸乙烯酯、碳酸甲乙酯和碳酸二乙酯在含氟电解液中的总质量百分含量为70~90wt%,且碳酸乙烯酯、碳酸甲乙酯和碳酸二乙酯的质量比为2.5~3.5:4.5~5.5:1.5~2.5。
- 根据权利要求44所述的含氟电解液,其特征在于:六氟磷酸锂为利用两个微通道反应器制备的六氟磷酸锂。
- 一种采用权利要求44-51任一项所述的含氟电解液的锂离子电池。
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