An electrolyte additive for improving the performance of NCM811 …
Ethyl 3-methyl-3-phenyl-glycidylate (EMP) was used as an electrolyte additive that can effectively improve the performance of LiNi0.8Co0.1Mn0.1O2 (NCM811) as the cathode of lithium-ion battery. The electrolyte containing 1.5% EMP can effectively improve the discharge-specific capacity of NCM811, which has an initial discharge …
Extending the high-voltage operation of Graphite/NCM811 cells by ...
The graphite/NCM811 cells were tested in the voltage range of 2.5–4.35/4.5V with a 0.2C/0.5C charge/discharge protocol, and a constant voltage charging protocol was applied at the end of the charge cut-off voltage until the current density decreases to 0.05C (1C = 180 mA/g). ... (STEM)-high-angle annular dark-field imaging …
Insight into structural degradation of NCMs under extreme fast …
rich NCM811 presents a unique multiple c-axis evolution even at low charging current at high-voltage regions, which is caused by heterogeneous delithiation during the charging …
Anode-free lithium metal batteries: a promising flexible energy storage ...
The severe growth of lithium dendrites and poor coulombic efficiency are also critical issues limiting the application and development of AFLMBs in flexible devices. 3,4 Inactive materials used in battery manufacturing, including electrolytes and current collectors, play crucial roles in stabilizing lithium deposition and maintaining lithium …
Herein, we propose a new ASSLiBs design with 3D interpenetrating structure containing LiNi 0·8 Mn 0·1 Co 0·1 O 2 (NCM811) cathode, a tri-layer SSE, and the metallic Li anode to increase the energy density and alleviate the interfacial non-compatibility, as schematically illustrated in Fig. 1.The tri-layer SSE consists of a porous …
Enhanced Storage and Interface Structure Stability of NCM811 …
Energy Technology is an applied energy journal covering technical aspects of energy process engineering, including generation, conversion, storage, & distribution. The nickel-rich ternary-layered oxide LiNi x Co y Mn (1−x−y) O 2 (NCM) cathode exhibits high reversible capacity and low cost; however, severe capacity fade and …
Surface-reinforced NCM811 with enhanced electrochemical …
The NCM811 was synthesized via the standard solid-phase method. [33] For the preparation of (NH 4) 2 WO 4-modified NCM811, 60 mg (NH 4) 2 WO 4 was firstly dispersed in 20 ml ethanol and stirred to obtain a suspension. Next, 4 g NCM811 was successively added into this system, heated, stirred for 30 min at 70 °C, and then filtered.
The charging and discharging curves belong to the specific NCM811 structure of the electrodes. Fig. 3 c and d show the charge/discharge curves of NCM811 …
Non-polar ether-based electrolyte solutions for stable high …
The electrochemical instability of ether-based electrolyte solutions hinders their practical applications in high-voltage Li metal batteries. To circumvent this issue, here, we propose a dilution ...
A review of the degradation mechanisms of NCM cathodes and ...
Li-ion batteries (LIBs) are the most widely used form of energy storage in mobile electronic devices and electric vehicles. Li-ion battery cathodes with the composition LiNi x Mn y Co z O 2 (NCMs) currently display some of the most promising electrochemical characteristics for high performance LIBs. NCM compositions with high nickel content (x > …
Elevating cycle stability of Ni-rich NCM811 cathode via single ...
An integrated strategy combining in-situ Na + doping with carbon coating was designed to construct excellently stable single-crystal NCM811.. The modified NCM-1 has lower Li + diffusion energy barrier and larger threshold energy of Ni 2+ /Li + exchange as confirmed by DFT calculation.. The combining strategy boosted Li + migration rate and …
Engineering an Insoluble Cathode Electrolyte Interphase …
Engineering an Insoluble Cathode Electrolyte Interphase Enabling High Performance NCM811//Graphite Pouch Cell at 60 °C. Yuqing Chen, Yuqing Chen. ... High-energy lithium-ion batteries (LIBs) can be realized with the use of nickel-rich materials, however, their reversible operation requires long-term cathode-electrolyte interfacial (CEI ...
In-situ formation of quasi-solid polymer electrolyte for wide ...
Herein, the Li/E-QSPE/NCM811 cell with a charging cutoff voltage of 4.3 V shows relatively high capacity (≈176.9 mAh g −1) and good long-term stability (capacity retention of 80 % over 350 cycles, ... Energy Storage Mater., 32 (2020), pp. 191-198. View PDF View article View in Scopus Google Scholar [31]
Regulating Li-ion solvation structure and Electrode-Electrolyte ...
1. Introduction. The escalating requirements for advanced energy storage solutions in electric vehicles, portable electronic devices, and grid storage have spurred the development of high energy–density battery technologies [1], [2], [3].Among these, Lithium (Li) metal batteries (LMBs) stand out, featuring Li metal anode (LMA) with unprecedented …
Design and mechanism exploration of single-crystalline NCM811 …
The precursors in this study are obtained by co-precipitation, as shown in Fig. S1 a, the NCM811 precursor was spherical secondary particles formed by the accumulation of primary particles. After calcination by the molten salt method, single-crystalline NCM811 materials (SC-NCM811, Fig. S1 b) with uniform particles can be …
Electrolyte perspective on stabilizing LiNi0.8Co0.1Mn0.1O2
Nickel-rich LiNi0.8Co0.1Mn0.1O2 (NCM811) is regarded as the promising cathode for lithium-ion batteries (LIBs). However, the challenges such as safety issues and poor cycling performance have seriously hindered its commercial applications. In order to overcome these difficulties, there has been extensive research and development of …
Replacing conventional battery electrolyte additives with dioxolone derivatives for high-energy-density lithium-ion batteries
The interface architecture from the synthesized vinylene carbonate-type additive enables high-energy-density LIBs with 81.5% capacity ... g Charge rate capability of NCM811/Si–C full cells at a ...
The Charge and discharge voltage profiles of NCM811/Li
Three pairs of anodic/cathodic broad peaks occurred in the first 2 cycles for both electrodes. a large anodic peak at 3.8 V and two small anodic peaks at 4.05 V and 4.25 V during the lithium-ion ...
Consequently, ∼400 W h kg −1 NCM811/Li cells at 4.7 V demonstrate an 82% capacity retention after 200 cycles. Commercial NCM811/Gr pouch cells at 4.5 V achieve 92% capacity retention over 500 cycles, concurrently with unexpectedly high safety performance in terms of thermal, mechanical, and electrical abuse.
The first charge and discharge capacities of NCM811 coated with ZrO 2 is slightly lower than that of NCM811 without any coating, but the first charge and discharge Coulomb efficiency is increased slightly, which is consistent with that of Al 2 O 3 coating. The first charge specific capacity of coin LIB made of NCM811 coated with LBO (D) is 230. ...
Structure, modification, and commercialization of high …
LiNi0.8Co0.1Mn0.1O2 (NCM811), as one of the most promising cathode materials for lithium ion batteries, has gained a huge market with its obvious advantages of high energy density and low cost. …
NCA, NCM811, and the Route to Ni-Richer Lithium-Ion Batteries
On charging to 4.5 V at 25 C, the corresponding full pouch cell with graphite anode delivered a capacity of 204 mAh g −1 (per gram of NCA-LFP) and 82.5% …
Design and mechanism exploration of single-crystalline NCM811 …
In this work, the SC high-nickel LiNi 0.8 Co 0.1 Mn 0.1 O 2 (NCM811) is modified by doping with titanium (Ti) element. The doped material can maintain better …
Stabilizing Interfaces in High-Temperature NCM811-Li Batteries …
We report a simple but effective strategy to break this bottleneck and stabilize interfaces in high-temperature NCM811-Li batteries in ether electrolytes. We propose that by gradually …
A dithiol-based new electrolyte additive for improving electrochemical performance of NCM811 …
LiNi0.8Co0.1Mn0.1O2 (NCM811) has received widespread attention due to its high discharge specific capacity. However, poor cycling performance and rate capacity limit its large-scale commercial applications. Here, we develop 4,5-Dicyano-1,3-dithiol-2-one (DDO) as a new type additive to enhance the cycling performance and rate capacity of …
Evolution of Structure and Lithium Dynamics in LiNi
The nickel-rich layered oxide LiNi0.8Mn0.1Co0.1O2 (NMC811) is a promising future cathode material for lithium-ion batteries in electric vehicles due to its high specific energy density. However, it exhibits fast voltage and capacity fading. In this article, we combine electrochemistry, operando synchrotron X-ray diffraction (XRD), and ex situ …
Evolution of Structure and Lithium Dynamics in LiNi
The nickel-rich layered oxide LiNi 0.8 Mn 0.1 Co 0.1 O 2 (NMC811) is a promising future cathode material for lithium-ion batteries in electric vehicles due to its high specific energy density. However, it …
Enhanced electrochemical properties of NCM811 cathode …
Ni-rich LiNi 0.8 Co 0.1 Mn 0.1 O 2 (NCM811) has been considered as the most attractive cathode material for lithium-ion batteries (LIBs). However, the fast capacity decay and poor rate performance limit its practical applications. Bulk doping and surface coating have been demonstrated as the most important and effective technologies for …
Replacing conventional battery electrolyte additives with …
The interface architecture from the synthesized vinylene carbonate-type additive enables high-energy-density LIBs with 81.5% capacity retention after 400 cycles at 1 C and fast charging capability ...
Enhanced Storage and Interface Structure Stability of NCM811 …
Moreover, the degree of improvement depends on the structure of the fluoroalkylsilanes, such as the number of F groups and the length of carbon chains. As a result, FAS17-modified NCM811 cathode materials after 30-day humid air exposure (humidity 70%) exhibit the greatest overall capacity retention of 74.2% after 200 …
Multifunctional solvent molecule design enables high-voltage Li …
Elevating the charging cut-off voltage is one of the efficient approaches to boost the energy density of Li-ion batteries (LIBs). However, this method is limited by the occurrence of severe ...
Stabilization of NCM811 cathode interface through …
Lithium metal batteries (LMBs) offer substantial promise for next-generation energy storage owing to lithium metal''s low reduction potential (−3.045 V vs. the standard hydrogen electrode) and its high specific capacity of 3860 mA h g−1. Among various cathode materials in LMBs, LiNi0.8Co0.1Mn0.1O2 (NCM811) is extens
Tailored PVDF Graft Copolymers via ATRP as High-Performance NCM811 ...
High-nickel layered oxides, e.g., LiNi0.8Co0.1Mn0.1O2 (NCM811), are promising candidates for cathode materials in high-energy-density lithium-ion batteries (LIBs). Complementing the notable developments of modification of active materials, this study focused on the polymer binder materials, and a new synthetic route was developed …
Stabilizing Interfaces in High‐Temperature NCM811‐Li Batteries …
Department of Applied Physics & Research Institute for Smart Energy, The Hong Kong Polytechnic University, Hung Hom, Hong Kong, 999077 P. R. China. These authors contributed equally to this work. ... The lifespan of high-temperature NCM811-Li cells is prolonged by more than 400 % with a stable average Coulombic efficiency of 99.77 % at …
Lithium Hexamethyldisilazide Endows Li||NCM811 Battery with …
The increasing demand for energy storage stimulates the extensive research of high energy density batteries [1,2,3].Lithium metal battery (LMB) composed by Li anode and LiNi 0.8 Co 0.1 Mn 0.1 O 2 (NCM811) cathode is one of the most promising candidates while it is applied at high cut-off voltage (i.e., ≥ 4.5 V vs Li/Li +). ...
Insight into the Electrochemical Behaviors of NCM811|SiO‐Gr Pouch Battery through Thickness Variation
LiNi0.8Co0.1Mn0.1O2 (NCM811) | SiOx-graphite (SiO-Gr.) battery chemistry is of intensive attention because its achievable practical energy density is approaching impressively 300 Wh Kg−1. However, ... LiNi 0.8 Co 0.1 Mn 0.1 O 2 (NCM811) | SiOx-graphite (SiO-Gr.) battery chemistry is of intensive attention because its achievable …
A monofluoride ether-based electrolyte solution for fast-charging …
Using this electrolyte solution, we assemble and test a 320 mAh Li||NCM811 multi-layer pouch cell, which delivers a specific energy of 426 Wh kg−1 (based on the weight of the entire cell) and ...
Insight into the Electrochemical Behaviors of NCM811|SiO‐Gr …
Firstly, the NCM811|SiO-Gr cell is characterized with the maximum cell thickness at around 80% state-of-charge (SOC) in the discharge process, rather than at 100% SOC. Secondly, the electrochemical behaviors during rate charge/discharge are diagnosed, and a Li platting signal is resolved from thickness variation profile at 2C.
Boosting cycle stability of NCM811 cathode material via 2D Mg-Al …
LiNi 0.8 Co 0.1 Mn 0.1 O 2 (NCM811) often suffers from the poor cycle stability as the cathode material for the lithium-ion battery (LIB), while Al 2 O 3 or MgO coating is the most common method to resolve such problem. However, the reported techniques often produced Al 2 O 3 or MgO particles with the large size or zero …
Smart Solid‐State Interphases Enable High‐Safety and High‐Energy ...
With the electrochemical performance of batteries approaching the bottleneck gradually, it is increasingly urgent to solve the safety issue. Herein, all-in-one strategy is ingeniously developed to design smart, safe, and simple (3S) practical pouch-type LiNi 0.8 Co 0.1 Mn 0.1 O 2 ||Graphite@SiO (NCM811||Gr@SiO) cell, taking full …
The Li|NCM811 cells were cycled at C/2 (1C = 200 mA g −1) charge/discharge between 3 and 4.6 V after the first three activation cycles at C/5 charge/discharge. The anode-free Cu|NCM811 pouch ...
