Synergistic Effect of Blended Components in Nonaqueous Electrolytes for Lithium Ion Batteries

Cekic‐Laskovic, Isidora; Aspern, Natascha von; Imholt, Laura; Kaymaksiz, Serife; Oldiges, Kristina; Rad, Babak Razaei; Winter, Martin

doi:10.1007/s41061-017-0125-8

Cited by 114 publications

(95 citation statements)

References 260 publications

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“…With the total conductivity and t

_{Li^{+}}

measured for ISO/LiTFSI, the partial lithium ion conductivity is 1.4 mS cm −1 at room temperature. The effective local in the PEO lamellae will be even ten times higher, as argued above, and becomes comparable to that of inorganic solid Li + conductors and even classical liquid electrolytes in lithium batteries . The results of the transference number measurements were also relevant regarding the stability, as the electrolyte surface was exposed to lithium metal electrodes.…”

Section: Figurementioning

confidence: 99%

An Ambient Temperature Electrolyte with Superior Lithium Ion Conductivity based on a Self‐Assembled Block Copolymer

Dörr

Pelz

Zhang

et al. 2018

Chemistry A European J

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In searching for polymer-based electrolytes with improved performance for lithium ion and lithium metal batteries, we studied block copolymer electrolytes with high amounts of bis(trifluoromethane)sulfonimide lithium obtained by macromolecular co-assembly of a poly(isoprene)-block-poly(styrene)-block-poly(ethylene oxide) and the salt from tetrahydrofuran. Particularly, an ultra-short poly(ethylene oxide) block of 2100 g mol was applied, giving rise to 2D continuous lamellar microstructures. The macroscopic stability was ensured with major blocks from poly(isoprene) and poly(styrene), which separated the ionic conductive PEO/salt lamellae. Thermal annealing led to high ionic conductivities of 1.4 mS cm at 20 °C with low activation energy and a superior lithium ion transference number of 0.7, accompanied by an improved mechanical stability (storage modulus of up to 10 Pa). With high Li:O ratios >1, we show a viable concept to achieve fast Li transport in block copolymers (BCP), decoupled from slow polymer relaxation.

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“…With the total conductivity and t

_{Li^{+}}

Section: Figurementioning

confidence: 99%

An Ambient Temperature Electrolyte with Superior Lithium Ion Conductivity based on a Self‐Assembled Block Copolymer

Dörr

Pelz

Zhang

et al. 2018

Chemistry A European J

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“…However, systematic investigations on the SEI layer characteristics and stability, formed by pre-lithiation, are needed to prove this statement. Hypothetically, pre-lithiation in certain electrolyte formulations (e.g., in the presence of electrolyte additives [15,46,47]), which are known to have a beneficial effect on SEI formation and stability but which are not favourable in contact to the positive electrode, may be useful as well.…”

Section: Introductionmentioning

confidence: 99%

Pre-Lithiation Strategies for Rechargeable Energy Storage Technologies: Concepts, Promises and Challenges

et al. 2018

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Abstract:In order to meet the sophisticated demands for large-scale applications such as electro-mobility, next generation energy storage technologies require advanced electrode active materials with enhanced gravimetric and volumetric capacities to achieve increased gravimetric energy and volumetric energy densities. However, most of these materials suffer from high 1st cycle active lithium losses, e.g., caused by solid electrolyte interphase (SEI) formation, which in turn hinder their broad commercial use so far. In general, the loss of active lithium permanently decreases the available energy by the consumption of lithium from the positive electrode material. Pre-lithiation is considered as a highly appealing technique to compensate for active lithium losses and, therefore, to increase the practical energy density. Various pre-lithiation techniques have been evaluated so far, including electrochemical and chemical pre-lithiation, pre-lithiation with the help of additives or the pre-lithiation by direct contact to lithium metal. In this review article, we will give a comprehensive overview about the various concepts for pre lithiation and controversially discuss their advantages and challenges. Furthermore, we will critically discuss possible effects on the cell performance and stability and assess the techniques with regard to their possible commercial exploration.

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“…This phenomenon was named as “chemomechanical” failure 24. Unlike flowable liquid electrolytes,25 which can effectively wet evolving cracks after volume expansion, in solid‐state batteries, the “chemomechanical” failure may cause fast capacity fading and short life span of the cells. For improving the sulfur cathode performance in SSLSBs, various approaches have been investigated and adopted.…”

Section: Introductionmentioning

confidence: 99%

Solid‐State Lithium–Sulfur Battery Enabled by Thio‐LiSICON/Polymer Composite Electrolyte and Sulfurized Polyacrylonitrile Cathode

Frerichs

Kolek

et al. 2020

Adv Funct Materials

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108

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Solid‐state lithium–sulfur battery (SSLSB) is attractive due to its potential for providing high energy density. However, the cell chemistry of SSLSB still faces challenges such as sluggish electrochemical kinetics and prominent “chemomechanical” failure. Herein, a high‐performance SSLSB is demonstrated by using the thio‐LiSICON/polymer composite electrolyte in combination with sulfurized polyacrylonitrile (S/PAN) cathode. Thio‐LiSICON/polymer composite electrolyte, which processes high ionic conductivity and wettability, is fabricated to enhance the interfacial contact and the performance of lithium metal anodes. S/PAN is utilized due to its unique electrochemical characteristics: electrochemical and structural studies combined with nuclear magnetic resonance spectroscopy and electron paramagnetic resonance characterizations reveal the charge/discharge mechanism of S/PAN, which is the radical‐mediated redox reaction within the sulfur grafted conjugated polymer framework. This characteristic of S/PAN can support alleviating the volume change in the cathode and maintaining fast redox kinetics. The assembled SSLSB full cell exhibits excellent rate performance with 1183 mAh g−1 at 0.2 C and 719 mAh g−1 at 0.5 C, respectively, and can accomplish 50 cycles at 0.1 C with the capacity retention of 588 mAh g−1. The superior performance of the SSLSB cell rationalizes the construction concept and leads to considerations for the innovative design of SSLSB.

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Synergistic Effect of Blended Components in Nonaqueous Electrolytes for Lithium Ion Batteries

Cited by 114 publications

References 260 publications

An Ambient Temperature Electrolyte with Superior Lithium Ion Conductivity based on a Self‐Assembled Block Copolymer

An Ambient Temperature Electrolyte with Superior Lithium Ion Conductivity based on a Self‐Assembled Block Copolymer

Pre-Lithiation Strategies for Rechargeable Energy Storage Technologies: Concepts, Promises and Challenges

Solid‐State Lithium–Sulfur Battery Enabled by Thio‐LiSICON/Polymer Composite Electrolyte and Sulfurized Polyacrylonitrile Cathode

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