Progress and Challenges of Ni‐Rich Layered Cathodes for All‐Solid‐State Lithium Batteries

Advanced Functional Materials, Год журнала: 2024, Номер unknown

Опубликована: Дек. 15, 2024

Abstract Ni‐rich layered oxides are recognized as one of the most promising candidates for cathodes in all‐solid‐state lithium batteries (ASSLBs) due to their intrinsic merits, such high average voltage and specific capacity. However, application is profoundly hindered by sluggish interfacial lithium‐ion (Li + )/electron transfer kinetics, which primarily caused surface residues, structural transformation, Li/Ni mixing, H2/H3 phase transition, microcracks. Furthermore, electro‐chemo‐mechanical failures at cathode/solid‐state electrolyte (SSE) interface, including side reactions, space‐charge layer (SCL) formation, physical disconnection, accelerate capacity fading. This work provides a systematic overview these challenges fundamental insights into utilizing ASSLBs. Additionally, several key parameters, cost, energy density, pressure, environmental temperature, evaluated meet requirements ASSLBs commercial applications. Moreover, representative modification strategies future research directions exploring advanced cathode‐based outlined. review aims provide comprehensive understanding essential expedite

Язык: Английский

Targeted Doping Enables Multi-Scale Stress Regulation for High Reliable Ni-Rich Layered Cathodes

Опубликована: Янв. 1, 2024

As one of the most promising positive electrode materials for power batteries, Ni-rich layered cathodes have recently attracted phenomenal attention due to their high energy density nature. However, suffer from severely intrinsic chemo-mechanical instabilities and insufficient service life, which is exacerbated further when batteries are operated at a voltage. Here, by carefully investigating single element doping chemistry, targeted strategy that combines advantages multiple elements proposed suppress strain accumulation during electrochemical cycling. The bulk compatible low-valence (LVEs) reduce volumetric stabilize highly delithiated crystal structure through doping. high-valence (HVEs) regulate growth direction primary particles form radial more conducive release. result, well-designed deliver excellent structural stability with capacity retention 94.8% 1 C after 200 cycles within 2.7-4.5 V (versus Li/Li+) in half cell 93.3% 500 3.0-4.25 graphite) layer full cell. This work provides universal suppressing degradation intercalation electrodes paves way next generation high-energy-density cathodes.

Язык: Английский

Structural Unpredictability of a Cobalt‐Free Layered Cathode and Its Mitigation for Producing Reliable, Sustainable Batteries

Advanced Energy Materials, Год журнала: 2024, Номер unknown

Опубликована: Дек. 5, 2024

Abstract To advance the sustainable development of Li‐ion batteries, reducing Co content in Li[Ni x y (Mn or Al) (1– – ) ]O 2 has become essential, prompting exploration Co‐free Mn alternatives. Among promising solutions are layered cathodes with compositional concentration gradients, which offer significant potential. However, their unique microstructure and partitioning, key to performance, highly sensitive synthesis temperatures. Over‐sintering can lead structural unpredictability cathode materials detrimental effects on electrochemical properties. In this study, a stable oxide is developed by doping gradient 0.9 0.1 , high‐valence ions. This innovative strategy significantly reduces sensitivity calcination temperatures, minimizing nano‐ microstructural changes across broad temperature range (750–810 °C). The particle‐level gradation grain‐level heteroelement encapsulation contribute material's exceptional performance. Mo doping, trace amounts, plays pivotal role maintaining stability cathodes, enabling high‐potential (4.3 V vs graphite) suitable for practical battery applications.

Язык: Английский