4.4 V lithium-ion polymer batteries with a chemical stable gel electrolyte

Yamamoto, Tohru; Hara, Tomitarô; Segawa, Ken; Honda, Kazuo; Akashi, Hiroyuki

doi:10.1016/j.jpowsour.2007.06.212

Cited by 20 publications

(11 citation statements)

References 31 publications

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“…Nevertheless, GPEs are presently used by various battery manufactures for the fabrication of the so called "lithium ion polymer batteries", LiPBs. Relevant examples are those currently under production in Japan, either using a flameretardant GPE with a low content of PVdF-HFP polymer matrix [42] or a GPE based on a mixture of cross-linkable polyalkylene oxide polymers [43].…”

Section: Improvements In Safety and Reliabilitymentioning

confidence: 99%

Lithium batteries: Status, prospects and future

Scrosati¹,

Garche²

2010

Journal of Power Sources

4,622

2,662

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Section: Improvements In Safety and Reliabilitymentioning

confidence: 99%

Lithium batteries: Status, prospects and future

Scrosati¹,

Garche²

2010

Journal of Power Sources

4,622

2,662

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“…9 The PE separator is supposed to be deteriorated by the reactive cathode or radical compounds generated from the decomposition of the electrolyte. Self-discharge of a cell may be accelerated by electrically conductive materials that originate in such deterioration of the separator.…”

Section: Resultsmentioning

confidence: 99%

“…[1][2][3][4][5] However, other unfavorable influences have to be considered at the same time when charging a battery to a higher voltage: It is known that the structure of layered cathode materials such as the most commonly used LiCoO 2 tends to become unstable when Li atoms are extracted to more than Li/M = 0.65. 6, 7 Higher charging voltage also means more oxidative atmosphere on the cathode side where the electrolyte and the separator tend to be more oxidized, 8,9 which may do harm to the performance of a battery.In this paper, the deterioration of the high temperature storage performance of a Li-ion battery at higher charging voltage is investigated. Effect of an insulating layer as the second layer between the cathode and the separator on the storage performance at 60 • C is studied and possible deterioration mechanism at higher charging voltage is discussed.…”

mentioning

confidence: 99%

Insertion of an Insulating Layer between Cathode and Separator for Improving Storage Characteristics of Li-Ion Batteries

Imachi

Nakamura

Fujitani

et al. 2012

J. Electrochem. Soc.

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Deterioration of a Li-ion battery charged to an elevated voltage is investigated. Insertion of an insulating layer consisting of TiO 2 powders and PVDF binder between the cathode and the separator suppresses the self-discharge during a storage test at 60 • C. This layer prevents the carbonization of the separator by oxidative cathode and this effect is greater when the insulating layer is placed on the cathode than on the separator. Development of a Li-ion battery with higher energy density has been of great interest because of increasing power consumption of mobile applications such as notebook computers and smart phones with multiple functions. Demand for smaller size of such applications also requires higher energy density of Li-ion batteries. One way to increase the energy density of a Li-ion battery is to utilize higher amount of Li ions in the cathode material by elevating the charging voltage. [1][2][3][4][5] However, other unfavorable influences have to be considered at the same time when charging a battery to a higher voltage: It is known that the structure of layered cathode materials such as the most commonly used LiCoO 2 tends to become unstable when Li atoms are extracted to more than Li/M = 0.65. 6, 7 Higher charging voltage also means more oxidative atmosphere on the cathode side where the electrolyte and the separator tend to be more oxidized, 8,9 which may do harm to the performance of a battery.In this paper, the deterioration of the high temperature storage performance of a Li-ion battery at higher charging voltage is investigated. Effect of an insulating layer as the second layer between the cathode and the separator on the storage performance at 60 • C is studied and possible deterioration mechanism at higher charging voltage is discussed. ExperimentalPreparation of electrode.-The slurry for cathode was prepared by mixing LiCoO 2 , acetylene black (AB), and polyvinylidene fluoride (PVDF) in N-methyl pyrrolidinone (NMP) with a weight ratio of 95:2.5:2.5. An Al current corrector was coated with the slurry, dried in a flowing air at 90 • C and then pressed with a pressure-roll until pre-determined thickness.For the anode, graphite, carboxymethylcellulose sodium (CMC) and styrene-butadiene rubber (SBR) were mixed in an aqueous solution with a weight ratio of 98:1:1 to make anode slurry. A Cu current collector for anode was coated with the slurry, dried in a flowing air at 110 • C and pressed.Preparation of second layer between cathode and separator.-To make a slurry for the second layer, TiO 2 , AB and PVDF in a weight ratio of 95:0:5, 90:5:5, 0:95:5 or 0:0:100 were mixed in NMP. TiO 2 used in the experiments has rutile structure and its average particle diameter is 250 nm.Both sides of the pressed cathode were coated with the slurry of 1μm thickness for each side, or one side of a PE micro porous film of 16μm thickness was coated with the slurry to form a second layer of 1μm thickness after drying. In either case, the intermediate layer was dried in a flowing air at 90 • C. Electrochemical behav...

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“…Polymers used for this purpose should have high chemical and electrical stability, good compatibility with electrolyte media, and excellent ability to form polymer networked structures. One of the most well‐known polymer as a gelator for the GPEs is poly(vinylidene fluoride‐ co ‐hexafluoropropylene) [poly(VDF‐ co ‐HDF)],5–8 which form physically crosslinked polymeric material by crystallization of the poly(vinylidene fluoride) segment. However, this type of GPE does not have enough affinity to the electrolyte solution so that it cannot sufficiently hold electrolytes inside the material.…”

Section: Introductionmentioning

confidence: 99%

Synthesis of polycarbosilanes having a five‐membered cyclic carbonate structure and their application to prepare gel polymer electrolytes for lithium ion batteries

Matsumoto

Endō

Katsuda

et al. 2012

J. Polym. Sci. A Polym. Chem.

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A silacyclobutane having a five‐membered cyclic carbonate structure (SBMC) was prepared, and its transition metal‐catalyzed ring‐opening polymerization at the four‐membered carbosilane unit was investigated as well as formation of carbosilane networked polymers and polymer gel electrolytes. The SBMC was synthesized by epoxidation of 1‐(4‐butenyl)‐1‐methylsilacyclobutane followed by insertion of CO2 to the epoxide. Ring‐opening polymerization of the silacyclobutane moiety in the SBMC readily proceeded by a transition metal catalyst such as platinum divinyltetramethyldisiloxane complex. A flexible networked polymer film was obtained by copolymerization of the SBMC with a small amount of crosslinker, hexamethylene‐1,6‐bis(1‐methylsilacyclobutane) (HMBS). The copolymerization of SBMC and HMBS in 1 M LiPF6 solution in ethylene carbonate and diethyl carbonate (3/7 v/v) gave a gel polymer electrolyte, which showed good ionic conductivity and could be applied to lithium ion batteries. © 2012 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem, 2012

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4.4 V lithium-ion polymer batteries with a chemical stable gel electrolyte

Cited by 20 publications

References 31 publications

Lithium batteries: Status, prospects and future

Lithium batteries: Status, prospects and future

Insertion of an Insulating Layer between Cathode and Separator for Improving Storage Characteristics of Li-Ion Batteries

Synthesis of polycarbosilanes having a five‐membered cyclic carbonate structure and their application to prepare gel polymer electrolytes for lithium ion batteries

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