锂离子电池正极材料的容量普遍偏低，这制约着其性能进一步提高。富锂锰基正极材料能够有效提升锂电低容量的短板高度，但该材料的推广却面临着电压易衰减、倍率性能差等瓶颈难题。为此，本项目以富锂锰基材料为研究对象，拟多角度联动地调控晶粒的晶畴结构、表面结构及结晶取向结构，增强结构的有序性、稳定性及电化学反应活性；多结构协同地抑制富锂锰基材料的压降，提高电池的能量密度、倍率性能及循环稳定性能。具体地，通过共沉淀-溶剂热制备工艺、掺杂工艺及浸渍-热处理表面修饰工艺的研究，揭示工艺参数及条件对晶粒结构的影响规律，阐明结构调控的机制，实现富锂锰基材料晶粒结构的可控制备，为电极材料结构的优化提供参考；通过电化学性能测试，揭示晶粒结构对电池放电电压、倍率性能及循环稳定性能的影响规律，阐明多结构协同稳压的作用机理，实现富锂锰基电池的压降有效抑制及其性能显著提高，为高性能锂电的开发提供参考。

The capacities of cathode materials are generally low, which have blocked from the further improvement in properties of lithium ion batteries. Lithium-rich manganese-based cathode materials can effectively increase the height of short board with low capacities for lithium ion batteries. However, some bottleneck challenges, such as a rapid voltage decay, and a low rate capability, have to be overcome prior to the practical application for these materials. Herein, lithium-rich manganese-based cathode materials are selected as our research object. We intend that the increasing of the order, the stability and the electrochemical reactivity for the grain structures is realized by the coordinated controls of the structures of the domain, the surface and the crystallographic orientation from multiple aspects of the processes, and the enhancing of the energy density, the rate capability and the cycle stability for the batteries is achieved by the synergized inhibition of the voltage decay of the cathodes from multiple aspects of the grain structures. In details, the effect laws of the processes parameters and the conditions on the grain structures are revealed by the coprecipitation-solvothermal synthesis process, the doping process and the dipping-heat treatment surface modification process. The mechanism for the grain structure control is elucidated. The corresponding results are expected to achieve controllable fabrication of the grain structures of lithium-rich manganese-based cathodes, which can provide the reference for optimization in the grain structures of electrodes. Furthermore, the influence rules of the grain structures on the discharge voltages, the rate capabilities and the cycle stabilities are demonstrated by the electrochemical performance tests. The mechanism for the synergized inhibition of the voltage decay from multiple aspects of the grain structures is elucidated. The obtained results are hoped to effectively prevent voltage decay and significantly enhance the electrochemical properties for lithium-rich manganese-based cathodes, which may afford the support for high-performance lithium ion batteries.