Enhanced cycle stability of LiCoPO 4 by using three-dimensionally ordered macroporous polyimide separator

Maeyoshi, Yuta; Miyamoto, S.; Munakata, Hirokazu; Kanamura, Kiyoshi

doi:10.1016/j.jpowsour.2017.03.053

Cited by 38 publications

(27 citation statements)

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“…All spectra are composed of a semicircle in the high frequency and a sloping line in the low frequency range. The semicircle and the sloping line correspond to the charge transfer resistance and warburg impedance associated with diffusion of the ion, respectively . The diameter of semicircle is 5.5 and 16.5 Ω for ceramic separator and pristine separator, respectively.…”

Section: Resultsmentioning

confidence: 99%

“…The semicircle and the sloping line correspond to the charge transfer resistance and warburg impedance associated with diffusion of the ion, respectively. 35 The diameter of semicircle is 5.5 and 16.5 X for ceramic separator and pristine separator, respectively. Previous studies 36,37 have reported that smaller semicircle diameter implies much lower interfacial impedance between separators and electrodes.…”

Section: Electrochemical Properties Of Various Separatorsmentioning

confidence: 99%

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Enhanced wettability and thermal stability of polypropylene separators by organic–inorganic coating layer for lithium‐ion batteries

Chao

Feng²,

Hua

et al. 2018

J of Applied Polymer Sci

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Organic–inorganic coating polypropylene separators were developed by introducing SiO2 nanoparticles through sol–gel process, where polydopamine was used as an intermediate layer. Scanning electron microscopy results showed the coating layers have highly porous structure, which was beneficial for liquid electrolyte uptake. Compared with pristine polypropylene separator, the ceramic separators showed improved thermal stability, higher ionic conductivity, and lower interfacial impedance. The cells employing the ceramic separators delivers excellent discharge capacity (retention = 75%) and coulombic efficiency up to 98% at 2 °C rate after 100 cycles. © 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2018, 135, 46478.

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Section: Resultsmentioning

confidence: 99%

Section: Electrochemical Properties Of Various Separatorsmentioning

confidence: 99%

Enhanced wettability and thermal stability of polypropylene separators by organic–inorganic coating layer for lithium‐ion batteries

Chao

Feng²,

Hua

et al. 2018

J of Applied Polymer Sci

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“…LCP 的理论比容量(170 mAh/g)与LFP (167 mAh/g) 基本相当 [5] , 而工作电压平台相对较高(4.8 V), 所以其理论能量密度(800 Wh/kg)比 LFP (578 Wh/kg) [6] 高~40%。此外, 与 LFP、LMP、LNP 相比, LCP 的空穴极化子迁移率最快, 即电子电导率最高 [7] 。与 LiCoO 2 (Co: 60.2wt%)相比, LCP (Co: 36.6wt%)的钴元素含量更低, 导致其材料成本更低 [8][9] 。但是, 与 LFP 相似, 纯相 LCP 的电导率极低 [10] (~10 -9 S/cm), 基本属于绝缘体。此外, LCP 的工作电压较高(4.8 V), 使得电解液容易分解且与体系内的 Co 3+ 发生反应, 从而影响 LCP 正极材料的电化学性能。目前主流的解决方案有三种: (1) 对 LCP 正极材料进行表面包覆, 通过保护正极提高材料充放电性能 [11] ; (2) 通过 Y 3+ [11] 、 Mg 2+ [12] 、 Mn 2+ [12][13] 、 Ni 2+ [12] 、V 3+ [14] 、Fe 2+ [15] 等元素掺杂来提高材料的导电性; (3) 通过制备方法实现对 LCP 正极材料微观形貌的控制, 从结构上改善 LCP 的电化学性能。目前用于制备 LCP 的主流方法为水热/溶剂热法 [16][17][18] 、溶胶凝胶法 [19][20] 、固相反应法 [21][22] 、多元醇法 [23] 等, 其中, 水热/溶剂热法在样品的结晶度及微观形貌控制方面有很大优势。 Ludwig 等 [16]…”

Section: 研究与应用严重受阻。unclassified

Morphology Controlling of the High-voltage Cathode Materials with Different Co-solvents

Ke¹,

Xie²,

Han³

et al. 2019

Journal of Inorganic Materials

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Cathode material LiCoPO 4 was synthesized by solvothermal method with a variety of water/alcohol solvent mixtures, including ethanol (ET), ethylene glycol (EG), and diethylene glycol (DEG). Focus of this work was set on the effect of the different alcohol solvent on morphology and particle size of material. Composition, crystal structure, morphology and particle size of the as-prepared samples were characterized by X-ray-diffraction, scanning electron microscopy and specific surface area test. The results show that relationship of the average particle size of the LiCoPO 4 samples synthesized with different alcohols solvents is in agreement with solubility of solvent for the precursor, but is inconsistent with the viscosity of solvent. Furthermore, LiCoPO 4 sample synthesized with EG/H 2 O possesses the smallest particle size, great crystallinity and excellent cycle performance. Its initial discharge specific capacities reaches to 130 mAh/g at 0.05C, and it shows a capacity retention of the initial value of 88% in 20th cycle. A variety of shapes are obtained from various co-solvents: hexagonal platelets for LiCoPO 4 obtained from EG, whereas, square platelets for LiCoPO 4 from ET/H 2 O and DEG/H 2 O.

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“…In previous works, we have developed materials suitable for lithium metal rechargeable batteries in order to improve the cycle performance. An ultrafine porous polyimide (PI) membrane with three-dimensionally ordered macroporous (3DOM) structure [13][14][15][16][17] has a high porosity of ca. 70%, and an ethylene carbonate (EC) solution (the best electrolyte for lithium metal) which can hardly permeate into a commercially available polyolefin separator, but can easily permeate into a 3DOM PI membrane (Figs.…”

Section: Introductionmentioning

confidence: 99%

Surface State Change of Lithium Metal Anode in Full Cell during Long Term Cycles

et al. 2019

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In order to investigate the surface state change of the lithium metal anode during long term cycles, a laminate-type lithium metal rechargeable battery was fabricated from a lithium foil, a Li 4 Mn 5 O 12 electrode, a polyimide (PI) membrane having a three-dimensionally ordered macroporous structure (3DOM) and a 1 mol dm −3 LiPF 6 ethylene carbonate (EC) solution as an anode, a cathode, a separator and an electrolyte, respectively. After the charge/ discharge cycles, the chemical composition at the surface of the lithium metal anode taken from the laminate cell was investigated by X-ray photoelectron spectroscopy (XPS). Decomposition products of electrolyte, e.g. Licontaining organic compounds, LiF or-PO 4 were accumulated on the lithium metal surface during long-term charge/discharge cycles. The accumulation of the decomposition products causes the increase of the lithium ion transport resistance of the battery, resulting in the inhibition of dissolution and deposition of lithium which is associated with drop of capacity.

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Enhanced cycle stability of LiCoPO 4 by using three-dimensionally ordered macroporous polyimide separator

Cited by 38 publications

References 38 publications

Enhanced wettability and thermal stability of polypropylene separators by organic–inorganic coating layer for lithium‐ion batteries

Enhanced wettability and thermal stability of polypropylene separators by organic–inorganic coating layer for lithium‐ion batteries

Morphology Controlling of the High-voltage Cathode Materials with Different Co-solvents

Surface State Change of Lithium Metal Anode in Full Cell during Long Term Cycles

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