"require further improvement" is a correct and usable phrase in written English.
You can use it when discussing something that could use more effort or improvement in order to reach a higher standard. For example: "Our customer satisfaction ratings are good, but they require further improvement if we want to stay competitive in the market."
However, their cycling performance at high voltages and rate conditions require further improvement for the purpose of commercialization.
Current immunotherapies targeting dendritic cells have shown a relative degree of success but still require further improvement.
New techniques that will play an important role in digitization process but require further improvement are then briefly proposed.
Moreover, although some cardiotoxicity assays have become standard in drug development, these assays require further improvement as they are prone to false-positive and false-negative outcomes.
ALTFs require further improvement for the individualized functional reconstruction of the tongue after hemiglossectomy, but this work lays the foundation for these improvements.
For each method, remarkable advances are described and the technological issues that require further improvement are presented, along with possible solutions.
But commercial success would require further improvements in the process.
Use of these batteries in planetary orbiters may require further improvements in their cycle life, especially at low depths of discharge.
Meeting the new target of no more than four billion metric tons of coal or its equivalent will require further improvements in efficiency if the economy expands 7 percent a year in the coming years.
(4) Data collection technique and analysis methods require further improvements.
We think that the hierarchical SACEM class assignment guidelines require further improvements.
