KxNayH(2‐x‐y)Ti2O5 for High‐Performance Lithium‐Ion Battery Anode with Li Dendrites‐Free Mechanism, Zero‐Strain Characteristic

Author:

Yuan Chaohui1,Wang Miao1,Wang Junjun2,Chen Wentian1,Li Na1,Fan Yuqian1ORCID,Ma Zhipeng1,Guo Wenfeng1,Mai Liqiang2ORCID

Affiliation:

1. Department of Applied Chemistry Hebei Key Laboratory of Applied Chemistry College of Environmental and Chemical Engineering Yanshan University Qinhuangdao 066004 China

2. State Key Lab of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan 430070 China

Abstract

AbstractConventional Li‐ion batteries equipped with graphite anodes suffer from poor rate performance and the risk of lithium dendrites, which constrain scale‐up applications. Among the promising candidates, spinel‐type Li4Ti5O12 is still subjected to low theoretical specific capacity, high working potential, and poor diffusion properties. Herein the KxNayH(2‐x‐y)Ti2O5 product is provided by reconstructing the chemical bonding idea, which exhibits enhanced specific capacity (323 mAh g−1), lower working potential (major capacity contribution < 1.5 V vs Li+/Li), higher diffusion coefficient (10−8.5–10−5 cm2 s−1), and long cycle stability. Further in/ex situ studies show that these excellent properties can be attributed to the combination of high capacitive contribution, unique “switching mechanism” to avoid lithium dendrite generation, and the zero‐strain properties. The findings provide new ideas and opportunities for the development of next generation titanate anode materials with desirable electrochemical properties.

Funder

National Natural Science Foundation of China

Publisher

Wiley

Subject

General Materials Science,Renewable Energy, Sustainability and the Environment

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