Nonmetallic ammonium (NH4+) ion batteries are promising candidates for large‐scale energy storage systems, which have the merit of low molar mass, sustainability, non‐toxicity and non‐dendrite. Herein, for the first time, we introduce the novel organic ammonium ion batteries (OAIBs). Significantly, a manganese‐based Prussian white analogue (noted as MnHCF) as cathode exhibits a reversible capacity of 104 mAh g−1 with 98 % retention over 100 cycles. We further demonstrate the electrochemical performance of the NH4+ ion full cell, which delivers a reversible capacity of 45 mAh g−1 with a broad electrochemical window. Combining ex situ XPS, ex situ XRD results and electrochemical properties, the NH4+ ion storage mechanism of MnHCF in a non‐aqueous electrolyte is clearly revealed. This work verifies the feasibility of employing NH4+ ions as charge carriers in organic energy storage systems and provides new insights for designing organic nonmetallic ion batteries with broad electrochemical windows and high energy density.

Few‐layered 2D analogs exhibit new physical/chemical properties, leading to a strong research interest and broad areas of application. Recently, lots of methods (such as ultrasonic and electrochemical methods) have already used to prepared 2D materials. However, these methods suffer from the drawbacks of low yield, high cost, or precarious state, which limit the large‐scale applications. Inspired by the famous Scotch tape method, we develop a ball‐milling with polymer “tape” method, fabricating few‐atomic‐layered material, showing the high‐yield, low‐cost, and much stability. As electrode material, ultrathin 2D materials can shorten the ion transfer pathway, contributing to the development of high‐power batteries. Meanwhile, few‐atomic‐layered structure can expose more active sites to increase their capacity, showing special energy storage mechanism. We use the as‐prepared few‐atomic‐layered Bi (FALB) and reduced oxide graphene composites as the anode for potassium/sodium‐ion batteries (KIBs/NIBs). The sample achieves a high reversible capacity of 395 mAh g−1 for KIBs, of which FALB contributes 438 mAh g−1 (higher than the theoretical capacity of Bi, 386 mAh g−1), and it carries outstanding cycle and rate performance in KIBs/NIBs.

New intent discovery aims to uncover novel intent categories from user utterances to expand the set of supported intent classes. It is a critical task for the development and service expansion of a practical dialogue system. Despite its importance, this problem remains underexplored in the literature. Existing approaches typically rely on a large amount of labeled utterances and employ pseudo-labeling methods for representation learning and clustering, which are label-intensive, inefficient, and inaccurate. In this paper, we provide new solutions to two important research questions for new intent discovery: (1) how to learn semantic utterance representations and (2) how to better cluster utterances. Particularly, we first propose a multi-task pre-training strategy to leverage rich unlabeled data along with external labeled data for representation learning. Then, we design a new contrastive loss to exploit self-supervisory signals in unlabeled data for clustering. Extensive experiments on three intent recognition benchmarks demonstrate the high effectiveness of our proposed method, which outperforms state-of-the-art methods by a large margin in both unsupervised and semisupervised scenarios. The source code will be available at https://github.com/ zhang-yu-wei/MTP-CLNN.

No abstract

Nonmetallic ammonium (NH4+) ion batteries are promising candidates for large‐scale energy storage systems, which have the merit of low molar mass, sustainability, non‐toxicity and non‐dendrite. Herein, for the first time, we introduce the novel organic ammonium ion batteries (OAIBs). Significantly, a manganese‐based Prussian white analogue (noted as MnHCF) as cathode exhibits a reversible capacity of 104 mAh g−1 with 98 % retention over 100 cycles. We further demonstrate the electrochemical performance of the NH4+ ion full cell, which delivers a reversible capacity of 45 mAh g−1 with a broad electrochemical window. Combining ex situ XPS, ex situ XRD results and electrochemical properties, the NH4+ ion storage mechanism of MnHCF in a non‐aqueous electrolyte is clearly revealed. This work verifies the feasibility of employing NH4+ ions as charge carriers in organic energy storage systems and provides new insights for designing organic nonmetallic ion batteries with broad electrochemical windows and high energy density.