Safe Li-ion polymer batteries for HEV applications

Zaghib, Karim; Charest, Patrick; Guerfi, Abdelbast; Shim, Joongpyo; Perrier, M.; Striebel, Kathryn A.

doi:10.1016/j.jpowsour.2004.02.020

Cited by 140 publications

(94 citation statements)

References 4 publications

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“…By examining Langmuir films and LB or LS films, it is possible to obtain information about the mechanical, electrical, optical, and chemical properties of oriented molecules at the interface as well as information about structural properties, such as the size and shape of molecules. [5][6][7][8][9][10][11] Poly(ethylene glycol) (PEG) and poly(ethylene oxide) (PEO) are widely studied polymers [12][13][14] with applications in a variety of technological fields such as drug delivery, 15,16 batteries, 17 and biotechnology. 18 Even though PEG and PEO are completely water-soluble at room temperature, PEO of sufficient molar mass can still form Langmuir monolayers at the A/W interface.…”

Section: Introductionmentioning

confidence: 99%

Telechelic Poly(ethylene glycol)−POSS Amphiphiles at the Air/Water Interface

Lee

Deng

et al. 2007

Macromolecules

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Combining two non-surface-active building blocks, oligomeric poly(ethylene glycol) (PEG) and a completely hydrophobic polyhedral oligomeric silsesquioxane (POSS) cage, creates amphiphilic telechelic polymers (POSS-PEG-POSS), which exhibit surface activity at the air/water (A/W) interface. POSS moieties serve as the hydrophobic groups for hydrophilic PEG chains of different number-average molar mass (1, 2, 3.4, 8, and 10 kg mol -1 ). For short PEG chains (1, 2, and 3.4 kg mol -1 ), insoluble monolayers form, whereas POSS end groups were not sufficiently hydrophobic to keep higher molar mass hydrophilic PEG blocks (8 and 10 kg mol -1 ) at the A/W interface. Thermodynamic analyses of the 1, 2, and 3.4 kg mol -1 POSS-PEG-POSS via surface pressurearea per monomer isotherms indicate that the POSS end groups reside at the A/W interface and that the PEG chains are squeezed into the subphase with increasing surface pressure. This conclusion is supported by X-ray reflectivity studies on Y-type Langmuir-Blodgett multilayer films which reveal a double-layer structure with a double-layer spacing of about 3.52 nm. These findings provide a strategy for producing new surface active species from non-surface-active precursors.

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Section: Introductionmentioning

confidence: 99%

Telechelic Poly(ethylene glycol)−POSS Amphiphiles at the Air/Water Interface

Lee

Deng

et al. 2007

Macromolecules

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“…It can be seen from Table 1 4 showed a spectacular increase in electrical conductivity which was 1.68×10 -6 S/cm compared with the 1.08×10 -10 S /cm of pure LiFePO 4 . Figure 7 …”

Section: Resultsmentioning

confidence: 87%

“…The results of FSEM observation and electrical conductivity measurement indicated that slight Mn-substitution minimized the particle size of LiFe 0.98 Mn 0.02 PO 4 /C and also obviously improved the electrical conductivity of the compound, thus obviously enhances the interface reaction process on the cathode. Lithium ion phosphate has been intensively investigated in recent years as the most promising cathode material for large-scale lithium ion batteries (such as EV and HEV ) due to its low cost, low toxicity, reasonable capacity and good thermal stability [1][2][3][4]. Commercial application of this material has made great progress.…”

mentioning

confidence: 99%

“…Lithium ion phosphate has been intensively investigated in recent years as the most promising cathode material for large-scale lithium ion batteries (such as EV and HEV ) due to its low cost, low toxicity, reasonable capacity and good thermal stability [1][2][3][4]. Commercial application of this material has made great progress.…”

mentioning

confidence: 99%

“…Several effective approaches such as carbon coating on the particle surface [5][6][7][8], minimizing the particle size [9][10][11], and cation substitution [12] have been applied to overcome the high rate problems at room temperature. However, efforts still need to be focused on enhancing low temperature performance of LiFePO 4 cathode. Although many efforts have been made on improving the low *Corresponding author (email: liaoxz@sjtu.edu.cn) temperature performance of lithium ion batteries by developing new low temperature electrolytes [13][14][15], improving the low temperature properties of the electrode materials is also imperative.…”

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confidence: 99%

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Enhanced low-temperature performance of slight Mn-substituted LiFePO4/C cathode for lithium ion batteries

et al. 2011

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Low temperature performance of LiFePO 4 /C cathode was remarkably improved by slight Mn-substitution. Electrochemical measurements showed that about 95% of the discharge capacity of LiFe 0.98 Mn 0.02 PO 4 /C cathode at 20°C was obtained at 0°C, compared to 85% of that of LiFePO 4 /C cathode. The LiFe 0.98 Mn 0.02 PO 4 /C sample also presented enhanced rate performance at -20°C with the discharge capacities of 124.4 mA h/g (0.1C), 99.8 mA h/g (1C), 80.7mAh/g (2C) and 70 mA h/g (5C), respectively, while pristine LiFePO 4 /C only delivered capacities of 120.5 mA h/g (0.1C), 90.7 mA h/g (1C), 70.4 mA h/g (2C) and 52.2 mA h/g (5C). Cyclic voltammetry measurements demonstrated an obvious improvement of the lithium insertion-extraction process of the LiFePO 4 /C cathode by slight Mn-substitution. The results of FSEM observation and electrical conductivity measurement indicated that slight Mn-substitution minimized the particle size of LiFe 0.98 Mn 0.02 PO 4 /C and also obviously improved the electrical conductivity of the compound, thus obviously enhances the interface reaction process on the cathode. Lithium ion phosphate has been intensively investigated in recent years as the most promising cathode material for large-scale lithium ion batteries (such as EV and HEV ) due to its low cost, low toxicity, reasonable capacity and good thermal stability [1][2][3][4]. Commercial application of this material has made great progress. It has been successfully used in batteries for laptops, power tools and electric bicycles, etc. However, there are still a number of issues to work out before the batteries are suitable for EV and HEV application, such as high rate capability and low temperature performance. Several effective approaches such as carbon coating on the particle surface [5][6][7][8], minimizing the particle size [9][10][11], and cation substitution [12] have been applied to overcome the high rate problems at room temperature. However, efforts still need to be focused on enhancing low temperature performance of LiFePO 4 cathode. Although many efforts have been made on improving the low *Corresponding author (email: liaoxz@sjtu.edu.cn) temperature performance of lithium ion batteries by developing new low temperature electrolytes [13][14][15], improving the low temperature properties of the electrode materials is also imperative. In our previous work [16], we reported the low temperature performance of LiFePO 4 /C cathode in a quaternary carbonate-based electrolyte. It was found that charge-discharge behavior of LiFePO 4 /C cathode was obviously impeded at low temperature. The increase of chargetransfer resistance and the decrease of lithium ion diffusion capability were the main performance limiting aspects at low temperature. In our present work, we managed to improve the rate capability of LiFePO 4 /C cathode at low temperatures by slight Mn-substitution of Fe-site in LiFePO 4 structure.

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Anticipated Progress in the Near‐ to Mid‐Term Future of LIBs

Myung

Kim

Sun

2020

Encyclopedia of Electrochemistry

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Since its commercialization in 1991, lithium‐ion batteries have been continuously studied to develop its energy density, power capability, and long‐term cycling characteristics. Unlike the earlier lithium‐ion battery based on the intercalation reaction such as LiCoO 2 cathode and graphite anode, various materials and reaction mechanisms have been investigated with the development of the technology. Also, in accordance with the improvement of the overall properties, lithium‐ion batteries are also being applied as energy storage systems (ESSs) for renewable energy facilities as well as power systems for electric vehicles (EVs). Moreover, in order to reduce the risk of explosion and to improve the stability of the battery, the electrolytes and separators in lithium‐ion batteries have been widely studied. This article highlights the current trend of the developments on the representative components in lithium‐ion battery.

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Safe Li-ion polymer batteries for HEV applications

Cited by 140 publications

References 4 publications

Telechelic Poly(ethylene glycol)−POSS Amphiphiles at the Air/Water Interface

Telechelic Poly(ethylene glycol)−POSS Amphiphiles at the Air/Water Interface

Enhanced low-temperature performance of slight Mn-substituted LiFePO4/C cathode for lithium ion batteries

Anticipated Progress in the Near‐ to Mid‐Term Future of LIBs

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