Graft copolymer-based lithium-ion battery for high-temperature operation

Hu, Qichao; Osswald, Sebastian; Daniel, Reece; Zhu, Yan; Wesel, Steven; Ortiz, Luis A.; Sadoway, Donald R.

doi:10.1016/j.jpowsour.2011.03.001

Cited by 74 publications

(44 citation statements)

References 61 publications

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“…However, in the scientific literature the term "high temperature cycling" mainly refers to cycling at temperatures at 60 or 70 • C, with only a few reports of battery cycling at 80 • C or higher [7][8][9][10][11][12][13][14][15][16][17][18][19][20]. The majority of these studies have been carried out with organic carbonate based electrolytes [7][8][9][10][11][12][13][14][15], but ionic liquid (IL) based electrolytes [16][17][18], solid polymer electrolytes [19], and ternary electrolytes (IL + polymer + Li-salt) [20] have also been explored. The extensive work with traditional carbonate electrolytes has aimed at finding suitable electrolyte additives [7], alternative binders [8], and the failure mechanisms for both the negative [9,10] and positive electrodes [11][12][13] as well as full cells [14,15].…”

Section: Introductionmentioning

confidence: 99%

Towards Li-Ion Batteries Operating at 80 °C: Ionic Liquid versus Conventional Liquid Electrolytes

et al. 2018

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Li-ion battery (LIB) full cells comprised of TiO 2 -nanotube (TiO 2 -nt) and LiFePO 4 (LFP) electrodes and either a conventional organic solvent based liquid electrolyte or an ionic liquid based electrolyte have been cycled at 80 • C. While the cell containing the ionic liquid based electrolyte exhibited good capacity retention and rate capability during 100 cycles, rapid capacity fading was found for the corresponding cell with the organic electrolyte. Results obtained for TiO 2 -nt and LFP half-cells indicate an oxidative degradation of the organic electrolyte at 80 • C. In all, ionic liquid based electrolytes can be used to significantly improve the performance of LIBs operating at 80 • C.

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Section: Introductionmentioning

confidence: 99%

Towards Li-Ion Batteries Operating at 80 °C: Ionic Liquid versus Conventional Liquid Electrolytes

et al. 2018

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“…Besides its role in stress relaxation, the elastomeric PDMS can also serve as a solid, ion-conductive, and mechanically conformable electrolyte by doping with lithium salt, [37] where dual functions of PDMS make promising the development of high performance and solid-state thin-film Li-ion batteries that use Si as the anode. We are also aware of the shortcoming of the present design, i.e., the PDMS/Si electrode structure.…”

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confidence: 99%

Silicon Thin Films as Anodes for High‐Performance Lithium‐Ion Batteries with Effective Stress Relaxation

Yu¹,

Li²,

Ma³

et al. 2011

Advanced Energy Materials

175

119

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There is a great deal of interest in developing next-generation lithium ion (Li-ion) batteries with higher energy capacity and longer cycle life for a diverse range of applications such as portable electronic devices, satellites, and next-generation electric vehicles. Silicon (Si) is an attractive anode material that is being closely scrutinized for use in Li-ion batteries because of its highest-known theoretical charge capacity of 4200 mAh g −1 .[1] The development of Si-anode Li-ion batteries has been hindered, however, mostly because of the large volumetric changes (up to 400%) that occur upon insertion and extraction of Li ions, and in turn the large electrochemically related stress, which results in electrode pulverization, loss of electrical contact, and early capacity fading of battery cells. [2][3][4][5] Despite this challenge, the extraordinarily high energy capacity of Si in its own right has motivated researchers to develop new techniques that reduce the limitations of Si as a practical anode material. Ultrathin Si films down to 50 nm in thickness have been reported for successful antipulverization and capacity nondegradation over two thousand charge/discharge cycles on roughened current collectors. [6] This result, together with a surge of work on improving the capacity retention of Si anodes such as nanoparticles [7,8] and/or composites, [9][10][11][12] nanowires, [13][14][15] or nanotubes [16,17] have shown improved performances, where the nanoforms of materials can offer expansion spaces during lithium insertion/extraction ( Figure 1A). However, some degree of capacity fading still exists due to the limited space for accommodating the facile strain expansion as well as decreased accessibility of the electrolyte to the solid -electrolyte interphase (SEI) between the silicon nanostructures and electrolyte. Here, we present a new strategy of stress relaxation for Si films using an elastomeric substrate that will establish an alternative route for new electrode design. In addition, the design of the anodes offers more efficient ion and electron transport than the reported work that uses nanoparticles, nanowires, or nanotubes.The general concept of stress relaxation can be understood using an eigen strain analogy. It is well-known that the eigen deformation of a free-standing material does not lead to mechanical stress, but only to self-compatible deformations, and eigen-strain-induced stresses are generated when the eigen strain is constrained. Consequently, the stress can be released by removing these constraints (e.g., stainless steel [13] and rough substrates [6] ). Herein, we report an approach in which the rigid substrates (e.g., current collectors) that constrain the "free" expansion/contraction of the Si anodes during charge/ discharge are replaced by soft substrates. The mechanism for stress relaxation is that the volumetric strain in Si that is induced by charge/discharge cycling can buckle the flat Si thin films when they are on soft substrates ( Figure 1B), which in turn releases the stress ...

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“…21 Even though the 36 conductivity of these BCEs barely reached 2 × 10 −5 S cm −1 at 60 ∘ C, they were used in LMBs. 24,25 Based on the same conducting block, Niitani et al showed that ionic conductivity and tensile strength vary in opposite ways in PS-b-POEM-b-PS comb triblock copolymers, depending on the PEO weight fraction. 26 At 30 ∘ C, the ionic conductivity of the electrolyte with at least 80% of the PEO phase was 10 −4 S cm −1 but the tensile strength was very poor.…”

Section: Dual-ion Conducting Bcesmentioning

confidence: 99%

Poly(ethylene oxide)‐based block copolymer electrolytes for lithium metal batteries

Phan

Issa

Gigmès

2018

Polymer International

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Nanostructured block copolymer electrolytes (BCEs) based on poly(ethylene oxide) (PEO) are considered as promising candidates for solid‐state electrolytes in high energy density lithium metal batteries (LMBs). Because of their self‐assembly properties, they confer on electrolytes both high mechanical strength and sufficient ionic conductivity, which linear PEO cannot provide. Two types of PEO‐based BCEs are commonly known. There are the traditional ones, also called dual‐ion conducting BCEs, which are a mixture of block copolymer chains and lithium salts. In these systems, the cations and anions participate in the conduction, inducing a concentration polarization in the electrolyte, thus leading to poor performances of LMBs. The second family of BCEs are single‐lithium‐ion conducting BCEs (SIC‐BCEs), which consist of anions being covalently grafted to the polymer backbone, therefore involving conduction by lithium ions only. SIC‐BCEs have marked advantages over dual‐ion conducting BCEs due to a high lithium ion transference number, absence of anion concentration gradients as well as low rate of lithium dendrite growth. This review focuses on the recent developments in BCEs for applications in LMBs with particular emphasis on the physicochemical and electrochemical properties of these materials. © 2018 Society of Chemical Industry

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Graft copolymer-based lithium-ion battery for high-temperature operation

Cited by 74 publications

References 61 publications

Towards Li-Ion Batteries Operating at 80 °C: Ionic Liquid versus Conventional Liquid Electrolytes

Towards Li-Ion Batteries Operating at 80 °C: Ionic Liquid versus Conventional Liquid Electrolytes

Silicon Thin Films as Anodes for High‐Performance Lithium‐Ion Batteries with Effective Stress Relaxation

Poly(ethylene oxide)‐based block copolymer electrolytes for lithium metal batteries

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